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CN120412803A - A mix design method for ecological recycled coarse aggregate permeable concrete - Google Patents

A mix design method for ecological recycled coarse aggregate permeable concrete

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Publication number
CN120412803A
CN120412803A CN202510897240.4A CN202510897240A CN120412803A CN 120412803 A CN120412803 A CN 120412803A CN 202510897240 A CN202510897240 A CN 202510897240A CN 120412803 A CN120412803 A CN 120412803A
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China
Prior art keywords
coarse aggregate
formula
determining
recycled
concrete
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202510897240.4A
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Chinese (zh)
Inventor
赵云
黄克起
刘晓敏
周俊龙
白新宇
张涛
张洋
车震
张倩
李晓鹏
许云龙
苏鹏宇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Construction Sixth Engineering Bureau General Contracting Engineering Co ltd
China Construction Sixth Engineering Division Co Ltd
China Construction Sixth Engineering Division Water Conservancy and Hydropower Construction Group Co Ltd
Original Assignee
China Construction Sixth Engineering Bureau General Contracting Engineering Co ltd
China Construction Sixth Engineering Division Co Ltd
China Construction Sixth Engineering Division Water Conservancy and Hydropower Construction Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Construction Sixth Engineering Bureau General Contracting Engineering Co ltd, China Construction Sixth Engineering Division Co Ltd, China Construction Sixth Engineering Division Water Conservancy and Hydropower Construction Group Co Ltd filed Critical China Construction Sixth Engineering Bureau General Contracting Engineering Co ltd
Priority to CN202510897240.4A priority Critical patent/CN120412803A/en
Publication of CN120412803A publication Critical patent/CN120412803A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
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    • C04B18/04—Waste materials; Refuse
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    • C04B18/08—Flue dust, i.e. fly ash
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
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    • C04B18/14—Waste materials; Refuse from metallurgical processes
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/16—Waste materials; Refuse from building or ceramic industry
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
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    • C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
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    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
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Abstract

The invention relates to a design method of an ecological recycled coarse aggregate permeable concrete mix proportion, which comprises the following steps of S1, preparing recycled coarse aggregate and testing performance, S2, determining the void ratio of mixed coarse aggregate under compaction conditions, S3, determining the volume ratio of mixed coarse aggregate in 1m 3 permeable concrete through an adjusting factor, S4, determining the dosage of cementing materials, S5, determining the dosage of cement and mineral admixtures, S6, determining the dosage of recycled coarse aggregate and natural coarse aggregate, S7, determining total water consumption, S8, checking the performance of the ecological recycled coarse aggregate permeable concrete and adjusting the ecological recycled coarse aggregate permeable concrete mix proportion according to test results. The design method provided by the invention has the advantages of clear overall thought, concise design steps, easiness in following, capability of avoiding waste in material, time, manpower and the like caused by repeated trial and error, and good practicability and operability.

Description

Design method for mixing proportion of ecological recycled coarse aggregate pervious concrete
Technical Field
The invention relates to the technical field of building materials, in particular to a method for designing an ecological recycled coarse aggregate permeable concrete mixing ratio.
Background
Concrete is widely used in structural and non-structural applications due to its low cost, wide range of applications, formability and high strength. At present, buildings consume large amounts of concrete, gradually depleting natural sand and gravel resources. At the same time, construction and demolition waste is produced in large quantities. On the one hand, the great demand for natural aggregate has highlighted the urgent need for sustainable alternatives in the construction industry. On the other hand, the piled up construction and demolition waste occupy a lot of land and cause environmental pollution. Therefore, the use of recycled aggregate prepared from construction and demolition waste as a substitute for natural aggregate in the preparation of concrete has become a fundamental trend in the construction material industry.
The pervious concrete is a concrete without fine particles or with very small amount of fine particles, and can form a stable and open structure, and is easy to drain. Its continuous porosity typically ranges from 15% to 35% and the presence of an interconnected macropore system facilitates the flow of water through the pervious concrete. In recent decades, due to various environmental benefits, the construction and use proportion of pervious concrete in parking lots, lanes, bank protection of river bank areas and sidewalks is higher and higher. The pervious concrete has the advantages of (1) allowing rainwater to be rapidly filtered into soil and supplying groundwater resources, (2) improving road surface environment, enabling the pervious concrete road surface to absorb noise of vehicles so as to create a quiet and comfortable environment, and (3) enhancing stability of bank protection by controlling rainwater runoff and prefiltering water, furthest reducing climate change results and reducing heat island effect so as to partially reduce adverse effects of urbanization.
In view of the fact that the permeable concrete application scenes are mainly used for projects such as bank protection and permeable pavement, a large amount of construction and demolition waste are usually contained around the projects, therefore, the recycled aggregate prepared by the construction and demolition waste is used as a substitute of natural aggregate in the construction process of the permeable concrete pavement, in-situ recycling of the construction waste can be achieved, waste is changed into valuable, and waste of manpower and financial resources can be greatly reduced. However, the current standard specifications do not give an explicit mix design method for pervious concrete, and there is still little literature on mix design methods for recycled aggregate pervious concrete. For example, JC/T2558-2020 water permeable concrete does not give a water permeable concrete mix design method, patent application "water permeable concrete mix design method based on aggregate characteristics and slurry wrapping thickness (CN 108548914A)" does not show the change of water permeable concrete mix design after adding recycled aggregate and has a plurality of uncertain parameters, patent application "high-strength and high-water permeable concrete mix design method based on skeleton structure (CN 109305781B)", patent application "water permeable concrete mix design method based on geopolymer water permeable concrete mix design and performance analysis method (CN 118471406A)" does not easily operate and follow, a large number of repeated trial-and-test is possibly needed, the applicability of the water permeable concrete mix design for recycled aggregate is poor, patent application "water permeable concrete mix design method (CN 111377691B)" does not consider the influence of recycled coarse aggregate on water permeable concrete mix design, and in addition, the existing patent and patent application based on aggregate stacking theory assume that aggregates are mutually connected and are spherical and do not completely coincide with the actual situation.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a design method for the mixing proportion of ecological recycled coarse aggregate permeable concrete.
The invention adopts the following technical scheme to realize the aim:
The design method of the ecological recycled coarse aggregate permeable concrete mixing ratio comprises the following steps:
s1, preparing recycled coarse aggregate and testing performance, wherein the recycled coarse aggregate meets the design requirement of a concrete mixing proportion;
S2, determining the void ratio of the mixed coarse aggregate under the compaction condition, wherein the mixed coarse aggregate is formed by mixing the recycled coarse aggregate and the natural coarse aggregate, and the method comprises the steps of determining parameters of the mass ratio of the recycled coarse aggregate, the relation between the mass ratio of the recycled coarse aggregate and the volume ratio, the bulk density and the average apparent density of the mixed coarse aggregate under the compaction state, and establishing a functional relation between the parameters and the void ratio of the mixed coarse aggregate;
S3, determining the volume ratio of the mixed coarse aggregate in the 1m 3 permeable concrete through the functional relation and the adjusting factor in the S2;
s4, determining the dosage of the cementing material in the 1m 3 permeable concrete by determining the volume of the clean slurry body of the permeable concrete;
s5, determining the dosage of the cement and the mineral admixture according to the dosage of the cementing material obtained in the S4;
S6, determining the consumption of the recycled coarse aggregate and the consumption of the natural coarse aggregate according to the volume ratio of the recycled coarse aggregate and the volume ratio of the mixed coarse aggregate in the 1m 3 permeable concrete;
S7, determining the total water consumption in 1m 3 pervious concrete;
s8, preparing according to the obtained permeable concrete mixing proportion, checking the performance of the ecological recycled coarse aggregate permeable concrete and adjusting the ecological recycled coarse aggregate permeable concrete mixing proportion according to the test result.
In particular, S1 comprises the following steps:
s11, primarily crushing the removed concrete member by using a crusher, and roughly screening the crushed coarse aggregate to remove massive impurities;
S12, placing the coarse aggregate after coarse screening into cleaning equipment for cleaning, and removing dust, sediment and fine impurities on the stool surface of the coarse aggregate;
S13, separating the cleaned coarse aggregate through a vibrating screen and a centrifugal machine to remove fine particles and slurry;
s14, naturally airing and drying the separated coarse aggregate, and removing redundant water;
s15, selecting proper recycled coarse aggregate according to the design requirement of the concrete mix proportion, and testing the basic performance parameters of the recycled coarse aggregate.
In particular, S2 includes the following steps:
s21, determining the mass ratio of the recycled coarse aggregate ;
In the case of the formula 1,;
In the case of the formula 2,;
Wherein, the In order to regenerate the amount of coarse aggregate,Is the total amount of the coarse aggregate,The natural coarse aggregate consumption;
s22, determining the mass ratio of the recycled coarse aggregate And the volume ratio of the recycled coarse aggregateA relationship between;
The method of the formula 3 is that, ;
Wherein, the Is the apparent density of the natural coarse aggregate,The apparent density of the recycled coarse aggregate;
s23, determining the stacking density of the mixed coarse aggregate in a compacted state ;
S231, mixing the recycled coarse aggregate and the natural coarse aggregate according to the following stepsProportioning and fully mixing to obtain mixed coarse aggregate;
s232, respectively filling the mixed coarse aggregate into three layers with the volume of Each layer is tamped 20 times with a metal tamping rod, and then the next layer is assembled until the steel container is full;
s233, measuring the weight of the steel container with and without the aggregate, and obtaining the quality of the mixed coarse aggregate by weight difference Determination of bulk Density in compacted Mixed coarse aggregate;
In the case of the formula 4,;
S24, determining the average apparent density of the mixed coarse aggregate;
In the case of the formula 5,;
S25, determining the void ratio of the mixed coarse aggregate according to the formula 4 and the formula 5;
In the case of the formula 6,。
In particular, in S3, the volume ratio of the mixed coarse aggregate in the 1m 3 permeable concrete is determinedThe formula of (2) is as follows:
in the case of the formula 7, ;
Wherein, the The value range is 0.91-0.93 for regulating factors.
In particular, S4 includes the following steps:
S41, determining the volume of a clean slurry body of the pervious concrete ;
In the case of the formula 8,;
Wherein, the Is the target value of the porosity in the permeable concrete;
Since the additive content used in the pervious concrete is very small, the volume of the additive in the clean slurry is ignored, and the volume of the clean slurry body of the pervious concrete is determined by the formula 9 ;
The method of the formula 9 is that,;
The method of the formula 10 is that,;
In the case of the formula 11,;
The method of the formula 12 is that,;
Wherein, the Is 1m 3 of the volume of the cementing material in the permeable concrete,Is 1m 3 of the volume of effective water in the permeable concrete,Is 1m 3 of the mass of the cementing material in the permeable concrete,Is the mass of effective water in 1m 3 permeable concrete,In order to achieve the density of the cementitious material,In order to achieve the density of water,For the density of the mineral admixture,In order to achieve the density of the cement,Is water-gel ratio and not more than 0.35,The proportion of the mineral admixture to the total amount of the cementing material;
S42, bringing the formula 9, the formula 10 and the formula 11 into the formula 8 to obtain a formula 13, and obtaining the dosage of the cementing material in the 1m 3 pervious concrete through the formula 13;
the formula 13 is given in the description, 。
In particular, in S5, the formula for determining the amounts of cement and mineral admixture is as follows:
mass of cement in 1m 3 pervious concrete And mass of mineral admixtureThe method comprises the following steps of:
the formula 14 is given in the description of the invention, ;
The formula 15 is shown in the drawing,。
In particular, the mineral admixture is fly ash, and the mixing amount of the fly ash is not more than 15% of the total amount of the cementing material.
In particular, the mineral admixture is silica fume, and the mixing amount of the silica fume is not more than 5% of the total amount of the cementing material.
In particular, in S6, the amount of the recycled coarse aggregate is determinedIs used in the amount of natural coarse aggregateThe formula of (2) is as follows:
The equation 16 is set forth in the description, ;
The method of the formula 17 is that,。
In particular, in S7, the total water usage in 1m 3 pervious concrete is determinedThe formula of (2) is as follows:
the equation 18 is set forth in its entirety, ;
The formula (19) is shown in the drawing,;
The equation 20 is set forth in the description,;
Wherein, the Is the mass of effective water in 1m 3 permeable concrete,Is the mass of the extra water in the 1m 3 permeable concrete,In order to stir and pour the mass of the extra water of the coarse aggregate,Is the mass of additional water in the admixture.
The beneficial effects of the invention are as follows:
(1) The combined use of the recycled coarse aggregate and the natural coarse aggregate provides a path for building and garbage removal, and the problem of natural sand and stone resource shortage is relieved to a certain extent.
(2) The coarse aggregate skeleton is optimally calculated by introducing the adjusting factors, so that the adjustability of the porosity of the pervious concrete is realized, and the mechanical property and the permeability of the pervious concrete are effectively balanced.
(3) The cementing material consists of two parts of mineral admixture and cement, so that the single use of cement is avoided, and the durability and mechanical property of the pervious concrete are improved.
(4) The full life cycle permeable concrete mixing proportion design method from the in-situ demolition of the old building to the recycling of the building waste is established, so that the carbon emission can be obviously reduced and the recycling rate of the building waste can be improved.
(5) The design method provided by the invention has the advantages of clear overall thought, concise design steps, easiness in following, capability of avoiding waste in material, time, manpower and the like caused by repeated trial and error, and good practicability and operability.
Detailed Description
The present invention is further illustrated below with reference to examples, which are selected only for the purpose of achieving the object of the present invention and are not intended to limit the scope of the present invention. Furthermore, no limitation to the exact ranges or values given by the present invention is intended, and such ranges or values should be values that are close to such ranges or values.
The design method of the ecological recycled coarse aggregate permeable concrete mixing ratio comprises the following steps:
s1, preparing recycled coarse aggregate and testing performance, wherein the recycled coarse aggregate meeting the design requirement of the concrete mix proportion is selected, and the method specifically comprises the following steps:
s11, primarily crushing the removed concrete member by using a crusher, and roughly screening the crushed coarse aggregate to remove massive impurities;
S12, placing the coarse aggregate after coarse screening into cleaning equipment for cleaning, and removing dust, sediment and fine impurities on the stool surface of the coarse aggregate;
S13, separating the cleaned coarse aggregate through a vibrating screen and a centrifugal machine to remove fine particles and slurry;
s14, naturally airing and drying the separated coarse aggregate, and removing redundant water;
s15, selecting proper recycled coarse aggregate according to the design requirement of the concrete mix proportion, and testing the basic performance parameters of the recycled coarse aggregate.
S2, determining the void ratio of the mixed coarse aggregate under the compaction condition, wherein the mixed coarse aggregate is formed by mixing the recycled coarse aggregate and the natural coarse aggregate, and comprises the following steps of determining parameters of the mass proportion of the recycled coarse aggregate, the relation between the mass proportion of the recycled coarse aggregate and the volume proportion, the bulk density and the average apparent density of the mixed coarse aggregate in the compaction state, and establishing a functional relation between the parameters and the void ratio of the mixed coarse aggregate:
s21, determining the mass ratio of the recycled coarse aggregate Mass ratio of recycled coarse aggregateRefers to the consumption of the recycled coarse aggregateTotal amount with coarse aggregateThe ratio between them. The dosage of the recycled coarse aggregate in the 1m 3 permeable concrete is calculated according to an absolute volume methodTotal amount with coarse aggregateThe relationship between them conforms to the following formula:
in the case of the formula 1, ;
In the case of the formula 2,;
Wherein, the In order to regenerate the amount of coarse aggregate,Is the total amount of the coarse aggregate,The natural coarse aggregate consumption;
The recycled coarse aggregate here means a concrete recycled coarse aggregate obtained by crushing concrete, and the natural coarse aggregate means crushed stone or pebble.
S22, determining the mass ratio of the recycled coarse aggregateAnd the volume ratio of the recycled coarse aggregateA relationship between;
The method of the formula 3 is that, ;
Wherein, the Is the apparent density of the natural coarse aggregate,The apparent density of the recycled coarse aggregate;
s23, determining the stacking density of the mixed coarse aggregate in a compacted state ;
S231, mixing the recycled coarse aggregate and the natural coarse aggregate according to the following stepsProportioning and fully mixing to obtain mixed coarse aggregate;
s232, respectively filling the mixed coarse aggregate into three layers with the volume of Each layer is tamped 20 times with a metal tamping rod, and then the next layer is assembled until the steel container is full;
s233, measuring the weight of the steel container with and without the aggregate, and obtaining the quality of the mixed coarse aggregate by weight difference Determination of bulk Density in compacted Mixed coarse aggregate;
In the case of the formula 4,;
S24, determining the average apparent density of the mixed coarse aggregate;
In the case of the formula 5,;
S25, determining the void ratio of the mixed coarse aggregate according to the formula 4 and the formula 5;
In the case of the formula 6,。
S3, through the functional relation and the regulating factor in S2Determining the volume ratio of the mixed coarse aggregate in 1m 3 permeable concrete;
In S1, the mixed coarse aggregate is fully connected under compaction conditions, however, this fully connected state of mixed coarse aggregate does not occur in the concrete mixture due to the presence of the paste. It is necessary to adjust the volume of the coarse aggregate in consideration of the shape effect that does not allow the aggregate to be completely connected. For this purpose, regulatory factors are definedThe volume of the coarse aggregate is adjusted, and a series of permeable concrete mixing proportion tests are implemented to obtain an adjusting factorThe value of (2) is 0.91-0.93. Therefore, the volume ratio of the mixed coarse aggregate in the 1m 3 permeable concreteThe calculation can be performed by equation 7:
in the case of the formula 7, ;
Wherein, the The value range is 0.91-0.93 for regulating factors.
S4, determining the dosage of the cementing material in the 1m 3 permeable concrete by determining the volume of the clean slurry body of the permeable concrete, and specifically comprising the following steps:
S41, determining the volume of a clean slurry body of the pervious concrete ;
In the case of the formula 8,;
Wherein, the Is the target value of the porosity in the permeable concrete;
Since the additive content used in the pervious concrete is very small, the volume of the additive in the clean slurry is ignored, and the volume of the clean slurry body of the pervious concrete is determined by the formula 9 ;
The method of the formula 9 is that,;
The method of the formula 10 is that,;
In the case of the formula 11,;
The method of the formula 12 is that,;
Wherein, the Is 1m 3 of the volume of the cementing material in the permeable concrete,Is 1m 3 of the volume of effective water in the permeable concrete,Is 1m 3 of the mass of the cementing material in the permeable concrete,Is the mass of effective water in 1m 3 permeable concrete,In order to achieve the density of the cementitious material,In order to achieve the density of water,For the density of the mineral admixture,In order to achieve the density of the cement,Is water-gel ratio and not more than 0.35,The proportion of the mineral admixture to the total amount of the cementing material;
S42, bringing the formula 9, the formula 10 and the formula 11 into the formula 8 to obtain a formula 13, and obtaining the dosage of the cementing material in the 1m 3 pervious concrete through the formula 13;
the formula 13 is given in the description, 。
S5, determining the dosage of the cement and the mineral admixture by the dosage of the cementing material obtained in the S4, wherein the dosage of the cement and the mineral admixture is determined by the following formula:
mass of cement in 1m 3 pervious concrete And mass of mineral admixtureThe method comprises the following steps of:
the formula 14 is given in the description of the invention, ;
The formula 15 is shown in the drawing,。
S6, according to the volume ratio of the recycled coarse aggregateAnd mixing the volume ratio of the coarse aggregate in 1m 3 permeable concreteDetermining the consumption of the recycled coarse aggregate and the natural coarse aggregate, and determining the consumption of the recycled coarse aggregateIs used in the amount of natural coarse aggregateThe formula of (2) is as follows:
The equation 16 is set forth in the description, ;
The method of the formula 17 is that,。
S7, determining the total water consumption in 1m 3 pervious concrete;
In determining the water usage, the additional water absorbed by the natural coarse aggregate and the recycled coarse aggregate is taken into consideration, and thus, the total water usage in 1m 3 permeable concrete is determined The formula of (2) is as follows:
the equation 18 is set forth in its entirety, ;
The formula (19) is shown in the drawing,;
The equation 20 is set forth in the description,;
Wherein, the Is the mass of effective water in 1m 3 permeable concrete,Is the mass of the extra water in the 1m 3 permeable concrete,In order to stir and pour the mass of the extra water of the coarse aggregate,Is the mass of additional water in the admixture.
S8, preparing according to the obtained permeable concrete mixing proportion, checking the performance of the ecological recycled coarse aggregate permeable concrete and adjusting the ecological recycled coarse aggregate permeable concrete mixing proportion according to the test result.
The cement is P.O42.5 grade ordinary Portland cement, and the apparent density is 2930kg/m 3. The mineral admixture is fly ash or silica fume, the mixing amount of the fly ash is not more than 15% of the total amount of the cementing material, the apparent density is 2420kg/m 3, and the mixing amount of the silica fume is not more than 5% of the total amount of the cementing material. The additive is a water reducer, the water reducer is a high-efficiency polycarboxylate water reducer, the apparent density of the water reducer is 1315kg/m 3, and the solid content of the water reducer is 40%. The apparent density of natural coarse aggregate is 2731kg/m 3, the bulk density is 1552kg/m 3, the particle size is 4.75-12mm, and the water absorption rate of aggregate is 0.62%. The basic performance parameters of the recycled coarse aggregate are 2612kg/m 3, the bulk density is 1441kg/m 3, the grain size range is 5-13mm, and the water absorption rate of the aggregate is 2.34%.
In order to verify the effectiveness of the mix design method of the invention, 2 embodiments are developed for verification.
Example 1 in this example, 40% recycled coarse aggregate was used instead of coarse aggregate, and the design porosity of the pervious concrete was 20%.
The design method of the ecological recycled coarse aggregate permeable concrete mixing ratio comprises the following steps:
s1, preparing recycled coarse aggregate and testing performance;
The final selected recycled coarse aggregate has apparent density of 2612kg/m 3, bulk density of 1441kg/m 3, particle size range of 5-13mm and water absorption of 2.34%.
S2, determining the void ratio of the mixed coarse aggregate under the compaction condition;
s21, determining the mass ratio of the recycled coarse aggregate ;
In the case of the formula 1,;
In the case of the formula 2,;
S22, determining the mass ratio of the recycled coarse aggregateAnd the volume ratio of the recycled coarse aggregateA relationship between;
The method of the formula 3 is that, ;
S23, determining the stacking density of the mixed coarse aggregate in a compacted state;
S231, mixing the recycled coarse aggregate and the natural coarse aggregate according to the following stepsProportioning and fully mixing to obtain mixed coarse aggregate;
s232, respectively filling the mixed coarse aggregate into three layers with the volume of In a steel container of =7l, each layer was tamped 20 times with a metal tamp rod, then the next layer was again assembled until the steel container was full;
s233, measuring the weight of the steel container with and without the aggregate, and obtaining the quality of the mixed coarse aggregate by weight difference Determination of bulk Density in compacted Mixed coarse aggregate =11.07 kg;
In the case of the formula 4,=1581.4kg/m3;
S24, determining the average apparent density of the mixed coarse aggregate;
In the case of the formula 5,=2681.6kg/m3;
S25, determining the void ratio of the mixed coarse aggregate according to the formula 4 and the formula 5;
In the case of the formula 6,≈0.41;
S3, through regulating factorsDetermining the volume ratio of the mixed coarse aggregate in 1m 3 permeable concrete;
In the case of the formula 7,=0.54m3;
Wherein, the Has a value of 0.92;
s4, determining the dosage of the cementing material;
S41, determining the volume of a clean slurry body of the pervious concrete ;
In the case of the formula 8,=0.26m3;
In order to improve the durability and mechanical properties of the pervious concrete, the mineral admixture is selected as fly ash, and 15% of fly ash is used for replacing cement.
The density of the cement is calculated by equation 12:
The method of the formula 12 is that, =2840kg/m3;
S42, determining the water-cement ratio to be 0.35, wherein the dosage of the cementing material in 1m 3 permeable concrete is as follows:
the formula 13 is given in the description, =370.3kg;
S5, determining the dosage of cement and mineral admixture;
mass of cement in 1m 3 pervious concrete And mass of mineral admixtureThe method comprises the following steps of:
the formula 14 is given in the description of the invention, =314.8kg;
The formula 15 is shown in the drawing,=55.5kg;
S6, determining the consumption of the recycled coarse aggregate and the natural coarse aggregate;
The equation 16 is set forth in the description, =578.3kg;
The method of the formula 17 is that,=870.1kg;
S7, determining total water consumption;
When the water consumption is determined, the additional water absorbed by the natural coarse aggregate and the regenerated coarse aggregate is considered, the dosage of the water reducer is 0.5% of the mass of the cementing material, so that the total water consumption in the 1m 3 permeable concrete is 1m Calculation is performed by equation 20;
the equation 18 is set forth in its entirety, =129.6kg;
The formula (19) is shown in the drawing,=17.82kg;
The equation 20 is set forth in the description,=147.4kg;
S8, preparing according to the obtained permeable concrete mixing proportion, checking the performance of the ecological recycled coarse aggregate permeable concrete and adjusting the ecological recycled coarse aggregate permeable concrete mixing proportion according to the test result.
Example 2 in this example, 70% recycled coarse aggregate was used instead of coarse aggregate, and the design porosity of the pervious concrete was 18%.
The design method of the ecological recycled coarse aggregate permeable concrete mixing ratio comprises the following steps:
s1, preparing recycled coarse aggregate and testing performance;
The final selected recycled coarse aggregate has apparent density of 2612kg/m 3, bulk density of 1441kg/m 3, particle size range of 5-12.5mm and water absorption rate of 2.34%.
S2, determining the void ratio of the mixed coarse aggregate under the compaction condition;
s21, determining the mass ratio of the recycled coarse aggregate ;
In the case of the formula 1,;
In the case of the formula 2,;
S22, determining the mass ratio of the recycled coarse aggregateAnd the volume ratio of the recycled coarse aggregateA relationship between;
The method of the formula 3 is that, ;
S23, determining the stacking density of the mixed coarse aggregate in a compacted state;
S231, mixing the recycled coarse aggregate and the natural coarse aggregate according to the following stepsProportioning and fully mixing to obtain mixed coarse aggregate;
s232, respectively filling the mixed coarse aggregate into three layers with the volume of In a steel container of =7l, each layer was tamped 20 times with a metal tamp rod, then the next layer was again assembled until the steel container was full;
s233, measuring the weight of the steel container with and without the aggregate, and obtaining the quality of the mixed coarse aggregate by weight difference Determination of bulk Density in Mixed coarse aggregate compacted State =10.66 kg;
In the case of the formula 4,=1508.5kg/m3;
S24, determining the average apparent density of the mixed coarse aggregate;
In the case of the formula 5,=2646.5kg/m3;
S25, determining the void ratio of the mixed coarse aggregate according to the formula 4 and the formula 5;
In the case of the formula 6,≈0.43;
S3, through regulating factorsDetermining the volume ratio of the mixed coarse aggregate in 1m 3 permeable concrete;
In the case of the formula 7,=0.52m3;
Wherein, the Has a value of 0.91;
s4, determining the dosage of the cementing material;
S41, determining the volume of a clean slurry body of the pervious concrete ;
In the case of the formula 8,=0.3m3;
In order to improve the durability and mechanical properties of the pervious concrete, the mineral admixture is selected as fly ash, and 10% of fly ash is used for replacing cement.
The density of the cement is calculated by equation 12:
The method of the formula 12 is that, =2869.5kg/m3;
S42, determining the water-cement ratio to be 0.3, wherein the dosage of the cementing material in 1m 3 permeable concrete is as follows:
the formula 13 is given in the description, =462.6kg;
S5, determining the dosage of cement and mineral admixture;
mass of cement in 1m 3 pervious concrete And mass of mineral admixtureThe method comprises the following steps of:
the formula 14 is given in the description of the invention, =416.3kg;
The formula 15 is shown in the drawing,=46.3kg;
S6, determining the consumption of the recycled coarse aggregate and the natural coarse aggregate;
The equation 16 is set forth in the description, =964.4kg;
The method of the formula 17 is that,=411.8kg;
S7, determining total water consumption;
When the water consumption is determined, the additional water absorbed by the natural coarse aggregate and the regenerated coarse aggregate is considered, the dosage of the water reducer is 0.5% of the mass of the cementing material, so that the total water consumption in the 1m 3 permeable concrete is 1m Calculation is performed by equation 20;
the equation 18 is set forth in its entirety, =138.8kg;
The formula (19) is shown in the drawing,=23.7kg;
The equation 20 is set forth in the description,=162.5kg;
S8, preparing according to the obtained permeable concrete mixing proportion, checking the performance of the ecological recycled coarse aggregate permeable concrete and adjusting the ecological recycled coarse aggregate permeable concrete mixing proportion according to the test result.
The specific compounding ratios of examples 1-2 are shown in Table 1.
TABLE 1 Water permeable concrete mix ratios in examples 1-2
According to the preparation of the pervious concrete in the mixing proportion of the pervious concrete in the embodiment 1-2, the clean slurry in the freshly mixed pervious concrete is found to uniformly wrap the aggregate, the slurry and the aggregate particles have good cohesiveness, the slurry flowing phenomenon does not occur, and the freshly mixed pervious concrete can be agglomerated after being held by hands. The permeable concrete was tested for continuous porosity, permeability coefficient, 28d compressive strength, 28d flexural strength, 25 cycle mass loss rate and abrasion resistance according to specifications ASTM C1754/C1754M, JC/T2558-2020, GB/T50081-2019, GB/T50082-2009 and GB/T129881, and the permeable concrete was tested for porosity according to the permeability coefficient of the permeable concrete after the test, and then the permeable concrete was subjected to performance and hardening performance strength tests, and specific test results are shown in table 2.
TABLE 2 Properties of the pervious concrete of examples 1-2
As can be seen from table 2, the continuous porosity of the pervious concrete in example 1 and the pervious concrete in example 2 is substantially equal to the target porosity, the error range is not more than 5%, and the adjustability of the porosity of the pervious concrete is realized;
The water permeability coefficient of the water permeable concrete in the example 1 is 6.8 mm/s, the water permeability coefficient of the water permeable concrete in the example 2 is 5.9mm/s, the water permeability coefficient of the water permeable concrete in the example 1 is up to the water permeability coefficient of the water permeable concrete in the standard JC/T2558-2020, the water permeability of the water permeable concrete is close to the water permeability of the water permeable concrete in the example 6, and the water permeable concrete in the example 1 and the water permeable concrete in the example 2 are good in water permeability;
The 28d compressive strength and the 28d flexural strength of the pervious concrete in the example 1 are 26.8MPa and 4.4MPa respectively, and the 28d compressive strength and the 28d flexural strength of the pervious concrete in the example 2 are 23.5MPa and 3.9MPa respectively, and the result shows that the pervious concrete still has good mechanical properties even when the proportion of the recycled coarse aggregate to the coarse aggregate is large;
The mass loss rate of the pervious concrete in the example 1 and the example 2 for the freeze thawing cycles for 25 times is 0.8 percent and 1.2 percent respectively, which is far smaller than the performance requirement that the mass loss rate of JC/T2558-202025 times is 5 percent.
According to the analysis of the performance results of the embodiments 1-2, the design method of the mixing ratio of the ecological recycled coarse aggregate pervious concrete can realize the adjustability of the water permeability, and the designed pervious concrete has good mechanical properties and freezing resistance, so that the blindness problem of the conventional mixing ratio design of the pervious concrete is solved.
While the invention has been described above by way of example, it will be apparent that the invention is not limited to the above embodiments, but is intended to be within the scope of the invention, as long as various modifications of the method concepts and technical solutions of the invention are adopted, or as long as modifications are directly applicable to other applications without modification.

Claims (10)

1. The design method of the mixing ratio of the ecological recycled coarse aggregate pervious concrete is characterized by comprising the following steps of:
s1, preparing recycled coarse aggregate and testing performance, wherein the recycled coarse aggregate meets the design requirement of a concrete mixing proportion;
S2, determining the void ratio of the mixed coarse aggregate under the compaction condition, wherein the mixed coarse aggregate is formed by mixing the recycled coarse aggregate and the natural coarse aggregate, and the method comprises the steps of determining parameters of the mass ratio of the recycled coarse aggregate, the relation between the mass ratio of the recycled coarse aggregate and the volume ratio, the bulk density and the average apparent density of the mixed coarse aggregate under the compaction state, and establishing a functional relation between the parameters and the void ratio of the mixed coarse aggregate;
S3, determining the volume ratio of the mixed coarse aggregate in the 1m 3 permeable concrete through the functional relation and the adjusting factor in the S2;
s4, determining the dosage of the cementing material in the 1m 3 permeable concrete by determining the volume of the clean slurry body of the permeable concrete;
s5, determining the dosage of the cement and the mineral admixture according to the dosage of the cementing material obtained in the S4;
S6, determining the consumption of the recycled coarse aggregate and the consumption of the natural coarse aggregate according to the volume ratio of the recycled coarse aggregate and the volume ratio of the mixed coarse aggregate in the 1m 3 permeable concrete;
S7, determining the total water consumption in 1m 3 pervious concrete;
s8, preparing according to the obtained permeable concrete mixing proportion, checking the performance of the ecological recycled coarse aggregate permeable concrete and adjusting the ecological recycled coarse aggregate permeable concrete mixing proportion according to the test result.
2. The method for designing the mixing proportion of the ecological recycled coarse aggregate pervious concrete according to claim 1, wherein the step S1 comprises the following steps:
s11, primarily crushing the removed concrete member by using a crusher, and roughly screening the crushed coarse aggregate to remove massive impurities;
S12, placing the coarse aggregate after coarse screening into cleaning equipment for cleaning, and removing dust, sediment and fine impurities on the stool surface of the coarse aggregate;
S13, separating the cleaned coarse aggregate through a vibrating screen and a centrifugal machine to remove fine particles and slurry;
s14, naturally airing and drying the separated coarse aggregate, and removing redundant water;
s15, selecting proper recycled coarse aggregate according to the design requirement of the concrete mix proportion, and testing the basic performance parameters of the recycled coarse aggregate.
3. The method for designing the mixing proportion of the ecological recycled coarse aggregate pervious concrete according to claim 1, wherein the step S2 comprises the following steps:
s21, determining the mass ratio of the recycled coarse aggregate ;
In the case of the formula 1,;
In the case of the formula 2,;
Wherein, the In order to regenerate the amount of coarse aggregate,Is the total amount of the coarse aggregate,The natural coarse aggregate consumption;
s22, determining the mass ratio of the recycled coarse aggregate And the volume ratio of the recycled coarse aggregateA relationship between;
The method of the formula 3 is that, ;
Wherein, the Is the apparent density of the natural coarse aggregate,The apparent density of the recycled coarse aggregate;
s23, determining the stacking density of the mixed coarse aggregate in a compacted state ;
S231, mixing the recycled coarse aggregate and the natural coarse aggregate according to the following stepsProportioning and fully mixing to obtain mixed coarse aggregate;
s232, respectively filling the mixed coarse aggregate into three layers with the volume of Each layer is tamped 20 times with a metal tamping rod, and then the next layer is assembled until the steel container is full;
s233, measuring the weight of the steel container with and without the aggregate, and obtaining the quality of the mixed coarse aggregate by weight difference Determination of bulk Density in compacted Mixed coarse aggregate;
In the case of the formula 4,;
S24, determining the average apparent density of the mixed coarse aggregate;
In the case of the formula 5,;
S25, determining the void ratio of the mixed coarse aggregate according to the formula 4 and the formula 5;
In the case of the formula 6,。
4. The method for designing the mix proportion of the ecological recycled coarse aggregate pervious concrete according to claim 3, wherein in S3, the volume ratio of the mixed coarse aggregate in the 1m 3 pervious concrete is determinedThe formula of (2) is as follows:
in the case of the formula 7, ;
Wherein, the The value range is 0.91-0.93 for regulating factors.
5. The method for designing the mixing ratio of the ecological recycled coarse aggregate pervious concrete according to claim 4, wherein the step S4 comprises the following steps:
S41, determining the volume of a clean slurry body of the pervious concrete ;
In the case of the formula 8,;
Wherein, the Is the target value of the porosity in the permeable concrete;
Since the additive content used in the pervious concrete is very small, the volume of the additive in the clean slurry is ignored, and the volume of the clean slurry body of the pervious concrete is determined by the formula 9 ;
The method of the formula 9 is that,;
The method of the formula 10 is that,;
In the case of the formula 11,;
The method of the formula 12 is that,;
Wherein, the Is 1m 3 of the volume of the cementing material in the permeable concrete,Is 1m 3 of the volume of effective water in the permeable concrete,Is 1m 3 of the mass of the cementing material in the permeable concrete,Is the mass of effective water in 1m 3 permeable concrete,In order to achieve the density of the cementitious material,In order to achieve the density of water,For the density of the mineral admixture,In order to achieve the density of the cement,Is water-gel ratio and not more than 0.35,The proportion of the mineral admixture to the total amount of the cementing material;
S42, bringing the formula 9, the formula 10 and the formula 11 into the formula 8 to obtain a formula 13, and obtaining the dosage of the cementing material in the 1m 3 pervious concrete through the formula 13;
the formula 13 is given in the description, 。
6. The method for designing the mix proportion of the ecological recycled coarse aggregate pervious concrete according to claim 5, wherein in S5, the formula for determining the dosage of cement and mineral admixture is as follows:
mass of cement in 1m 3 pervious concrete And mass of mineral admixtureThe method comprises the following steps of:
the formula 14 is given in the description of the invention, ;
The formula 15 is shown in the drawing,。
7. The method for designing the mix proportion of the ecological recycled coarse aggregate pervious concrete according to claim 6, wherein the mineral admixture is fly ash, and the mixing amount of the fly ash is not more than 15% of the total amount of the cementing material.
8. The method for designing the mixing proportion of the ecological recycled coarse aggregate pervious concrete according to claim 6, wherein the mineral admixture is silica fume, and the mixing amount of the silica fume is not more than 5% of the total amount of the cementing material.
9. The method for designing the mix proportion of the ecological recycled coarse aggregate pervious concrete according to claim 4, wherein in S6, the dosage of the recycled coarse aggregate is determinedIs used in the amount of natural coarse aggregateThe formula of (2) is as follows:
The equation 16 is set forth in the description, ;
The method of the formula 17 is that,。
10. The method for designing the mixing ratio of the ecological recycled coarse aggregate pervious concrete according to claim 1, wherein in S7, the total water consumption of 1m 3 pervious concrete is determinedThe formula of (2) is as follows:
the equation 18 is set forth in its entirety, ;
The formula (19) is shown in the drawing,;
The equation 20 is set forth in the description,;
Wherein, the Is the mass of effective water in 1m 3 permeable concrete,Is the mass of the extra water in the 1m 3 permeable concrete,In order to stir and pour the mass of the extra water of the coarse aggregate,Is the mass of additional water in the admixture.
CN202510897240.4A 2025-07-01 2025-07-01 A mix design method for ecological recycled coarse aggregate permeable concrete Pending CN120412803A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013056642A1 (en) * 2011-10-17 2013-04-25 交通运输部公路科学研究所 Method for determining composition of coarse-grain, high-modulus asphalt concrete with interlocking structure
CN106227976A (en) * 2016-08-04 2016-12-14 山东交通学院 A kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete
CN111848046A (en) * 2020-07-30 2020-10-30 浙江大学 Mix ratio design method of recycled brick and pervious concrete and its application

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013056642A1 (en) * 2011-10-17 2013-04-25 交通运输部公路科学研究所 Method for determining composition of coarse-grain, high-modulus asphalt concrete with interlocking structure
CN106227976A (en) * 2016-08-04 2016-12-14 山东交通学院 A kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete
CN111848046A (en) * 2020-07-30 2020-10-30 浙江大学 Mix ratio design method of recycled brick and pervious concrete and its application

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