CN117819907B - Low-carbon road subbase material doped with water supply plant sludge, and preparation method and application thereof - Google Patents
Low-carbon road subbase material doped with water supply plant sludge, and preparation method and application thereofInfo
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Abstract
The invention discloses A low-carbon road subbase material doped with water supply plant sludge and A preparation method thereof, wherein the water supply plant sludge, A conditioner, an auxiliary agent, engineering slag soil, A soil body curing agent and the like are taken as raw materials, the water content, the grading and the plasticity index of A system are regulated by the aid, the water content and the environmental safety of the system are regulated by the conditioner, and based on the synergistic effect of multi-source solid waste, al 2 2O3 3、SiO2 2 and CA (OH) 2 2 in the soil body curing agent react to generate C-A-S-H, C-S-H, C-A-H gel, aft and the like, so that the low-carbon road subbase material has good compactness, mechanical property, water stability and environmental safety. Meanwhile, the production cost is reduced, the resource utilization level of solid wastes such as engineering slag soil, water supply plant sludge, steel slag powder, industrial byproduct gypsum and the like is improved, and the principles of resource utilization maximization, performance optimization and economic cost optimization are realized.
Description
Technical Field
The invention belongs to the field of solid waste resource utilization, in particular to the technical field of low-carbon road subbase materials doped with water supply plant sludge, and particularly relates to a low-carbon road subbase material doped with water supply plant sludge prepared from engineering slag, water supply plant sludge, regenerated fine aggregate, steel slag powder, industrial byproduct gypsum and other solid wastes, and a preparation method and application thereof.
Background
The characteristics of higher water content, high organic matter content, large performance difference and the like limit the safe recycling utilization of the sludge in the water supply plant. Considering the physicochemical properties of the sludge in the water supply plant, if the low-carbon road subbase material doped with the sludge in the water supply plant is applied to the road subbase, not only can the problems of stacking and occupying the land of the sludge in the water supply plant be solved, but also the sludge in the water supply plant can be promoted to be recycled, and obvious social, economic and environmental benefits can be created.
The water content, grading and plasticity index of the water supply plant sludge are regulated by using an auxiliary agent, the water content and the environmental safety are regulated and controlled by a conditioner, the mechanical property of the low-carbon road subbase material doped with the water supply plant sludge is promoted by Ca (OH) 2、Al2O3、SiO2 components in a soil body curing agent, but the problems that the raw materials and the raw material proportion adopted by the low-carbon road subbase material doped with the water supply plant sludge still need to be considered when the low-carbon road subbase material doped with the water supply plant sludge is prepared at present by using multi-source solid waste (1) and whether the low-carbon road subbase material doped with the water supply plant sludge can meet the standard performance requirements of JTG/T F-2015 (highway pavement basic construction technical rules), cement-based regenerated materials (CECS 397-2015) and the like are solved.
In view of the above, there is a need in the industry to develop a low-carbon road subbase material doped with water supply plant sludge and a preparation method thereof, which can reduce resource consumption, reduce production cost, improve the resource utilization level of solid wastes such as engineering slag, water supply plant sludge, regenerated fine aggregate, steel slag powder, industrial byproduct gypsum and the like, solve the problems of safety and environment of the water supply plant sludge and the engineering slag, and have remarkable social, economic and environmental benefits.
Disclosure of Invention
Aiming at the defects in the prior art, the main purpose of the invention is to provide A low-carbon road subbase material doped with water supply plant sludge, which takes engineering slag, water supply plant sludge, regenerated fine aggregate, conditioner, silicate cement, steel slag powder, industrial byproduct gypsum, composite admixture, pH regulator, surfactant and the like as raw materials, improves the resource utilization level of solid wastes such as engineering slag, water supply plant sludge, regenerated fine aggregate, steel slag powder, industrial byproduct gypsum and the like, regulates the water content, grading and plasticity index of A system by using an auxiliary agent, regulates the water content and environmental safety of the system by using the conditioner, and generates C-A-S-H, C-S-H, C-A-H gel and Aft and the like by the reaction of Al 2O3、SiO2 in A soil body curing agent based on the synergistic effect of multi-source solid wastes, so that the low-carbon road subbase material has good compactness, mechanical property, water stability and environmental safety.
The invention also aims to provide the preparation method of the low-carbon road subbase material doped with the water supply plant sludge, and the low-carbon road subbase material doped with the water supply plant sludge, which meets the standard performance requirements of JTG/T F20-2015, the technical rules for road pavement basic construction, the environmental safety detection standard of cement-based regenerated materials (CECS 397-2015) and the like, is prepared by selecting the raw materials and the proportion of the low-carbon road subbase material doped with the water supply plant sludge, reduces the production cost, can promote the recycling of multi-source solid wastes, and has remarkable social, economic and environmental benefits.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The invention provides a low-carbon road subbase material doped with water supply plant sludge, which comprises, by weight, 0.5-4% of a conditioning agent, 2-20% of water supply plant sludge, 0.01-30% of an auxiliary agent, 50-95% of engineering slag soil and 5-15% of a soil body curing agent.
According to the preferred technical scheme, the low-carbon road subbase material doped with the water supply plant sludge comprises the following components, by weight, 2 parts of a conditioning agent, 10 parts of the water supply plant sludge, 10 parts of an auxiliary agent, 70 parts of engineering slag soil and 8 parts of a soil body curing agent.
According to the preferred technical scheme, the low-carbon road subbase material doped with the water supply plant sludge comprises, by weight, 1 part of a conditioning agent, 10 parts of the water supply plant sludge, 5 parts of an auxiliary agent, 78 parts of engineering slag soil and 6 parts of a soil body curing agent.
According to the preferred technical scheme, the low-carbon road subbase material doped with the water supply plant sludge comprises the following components, by weight, 1 part of a conditioning agent, 5 parts of the water supply plant sludge, 10 parts of an auxiliary agent, 79 parts of engineering slag soil and 5 parts of a soil body curing agent.
According to the preferred technical scheme, the low-carbon road subbase material doped with the water supply plant sludge comprises the following components, by weight, 2 parts of a conditioning agent, 10 parts of the water supply plant sludge, 20 parts of an auxiliary agent, 60 parts of engineering slag soil and 8 parts of a soil body curing agent.
According to the preferred technical scheme, the low-carbon road subbase material doped with the water supply plant sludge comprises the following components, by weight, 1 part of a conditioning agent, 10 parts of the water supply plant sludge, 10 parts of an auxiliary agent, 74 parts of engineering slag soil and 5 parts of a soil body curing agent.
The soil body curing agent comprises, by weight, 15% -30% of Portland cement, 15% -30% of steel slag powder, 20% -30% of industrial byproduct gypsum, 30% -50% of composite admixture, 1% -5% of pH regulator and 0.01% -0.8% of surfactant.
Preferably, the surfactant is one or more of lignosulfonate and triethanolamine.
Preferably, the natural water content of the engineering slag soil is 15% -50%, the plasticity index is 7% -25%, and the organic matter content is less than 5%.
Preferably, the water content of the water supply plant sludge is 40% -80%, the pH is 6-8, the organic matter content is less than 25%, the mercury content is 0.02-0.08 mg/kg, the arsenic content is 10-80 mg/kg, the lead content is 10-120 mg/kg, the copper content is 30-90 mg/kg, and the nickel content is 10-80 mg/kg.
Preferably, the auxiliary agent is recycled fine aggregate, the recycled fine aggregate is formed by processing concrete, mortar, stone, bricks, tiles and the like in construction waste, the particle size of the recycled aggregate is less than 4.75mm, the water absorption rate is 6% -15%, the apparent density is 2100-2500 kg/m 3, the stone powder content is 0-1%, and the crushing index is 20% -38%.
Preferably, the conditioning agent is selected from quicklime and/or gray calcium and the like, having an effective calcium oxide content of >70%.
Preferably, the steel slag powder contains 35-50% of CaO, 5-10% of Fe 2O3：20％～35％,SiO2 and less than or equal to 15% of f-CaO.
Preferably, the industrial byproduct gypsum comprises one or more of phosphogypsum and desulfurized gypsum, the purity is more than 80%, the pH is 5-12, and the fineness (80 μm square hole sieve residue) is <5%.
The composite admixture is formed by compounding and grinding of 20-50% of fly ash, 50-80% of slag powder, 0.01-10% of limestone powder and 0.01-2% of an exciting agent, wherein the exciting agent is selected from CaO, naOH or gypsum, preferably CaO.
The second aspect of the invention provides a preparation method of the low-carbon road subbase material doped with water supply plant sludge, which comprises the following steps:
(1) The engineering slag soil pretreatment, namely the natural water content of the engineering slag soil is 15% -50%, the airing treatment is needed, and the water content of the engineering slag soil is controlled to be lower than 15%.
(2) The water supply plant sludge pretreatment, namely, the water content of the water supply plant sludge is 40% -80%, a predetermined amount of conditioning agent and auxiliary agent are added into the water supply plant sludge, the water content and grading are regulated and controlled, the airing treatment is carried out, the water content of the mixture A is tested, and the water content of the mixture A is controlled to be lower than 15%.
(3) And (3) preparing a soil body curing agent, namely sequentially feeding the weighed silicate cement, steel slag powder, industrial byproduct gypsum, a composite admixture, a pH regulator and a surfactant into a stirrer according to a feeding sequence, stirring for 2-3 min, uniformly mixing, and discharging to obtain the soil body curing agent.
(4) And determining the optimal water content and the maximum dry density of the low-carbon road subbase material doped with the water supply plant sludge through a compaction test, and calculating the water adding amount of the low-carbon road subbase material doped with the water supply plant sludge according to the optimal water content and the maximum dry density.
(5) Adding the pretreated engineering slag soil and the mixture A into a stirrer, stirring for 2-3 min, uniformly mixing, adding water (about 2% of water is reserved according to the preset water adding mass), stirring for 2min, uniformly stirring, sealing and soaking for 12-36 h, adding a preset amount of soil curing agent in the step (4) and about 2% of water reserved in 1h before the test piece is molded, uniformly stirring, molding, and demolding to obtain the low-carbon road subbase material doped with water supply plant sludge.
The third aspect of the invention provides the application of the low-carbon road subbase material doped with the water supply plant sludge in the road subbase, which can be used for the subbase materials of the heavy, medium and light traffic of highways and primary highways, light traffic and secondary and lower highways.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, the low-carbon road subbase material doped with the water supply plant sludge is prepared by selecting the components of the low-carbon road subbase material doped with the water supply plant sludge, adopting engineering dregs, water supply plant sludge, conditioning agents, assistants, portland cement, steel slag powder, industrial byproduct gypsum, composite admixture, pH regulator and surfactant and adjusting the formula, so that the resource utilization level of solid wastes such as engineering dregs, water supply plant sludge, steel slag powder and industrial byproduct gypsum can be reduced, and the solid waste utilization level of JTG/T F 'technical rules for road pavement subbase construction and cement-based regenerated materials' environmental safety detection standards (CECS 397-2015) and other standard performance requirements can be improved.
(2) The additive of the invention regulates the water content, the grading and the plasticity index of the system, the conditioner regulates the environmental safety of the system, meanwhile, al 2O3、SiO2 in the soil body curing agent and CA (OH) 2 are utilized to react to generate hydration products such as C-A-S-H, C-S-H, C-A-H gel, aft and the like, the mechanical properties of the low-carbon road subbase materials doped with water supply plant sludge are improved, and heavy metal ions are solidified/stabilized through physical wrapping, precipitation, adsorption and ion replacement, so as to realize the principles of resource utilization maximization, performance optimization and economic cost optimization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the drawings needed in the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a graph showing the performance test of the low-carbon road subbase materials doped with water supply plant sludge prepared in examples 1 to 5, wherein G1, G3 to G5 are engineering slag soil in Shanghai city, and G2 is Shandong labor-saving Cheng Zhatu.
Detailed Description
Hereinafter, the present invention will be described in detail. Before the description, it is to be understood that the terms used in this specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation. Accordingly, the description set forth herein is merely a preferred example for the purpose of illustration and is not intended to limit the scope of the invention, so that it should be understood that other equivalents or modifications may be made thereto without departing from the spirit and scope of the invention.
The following examples are merely illustrative of embodiments of the present invention and are not intended to limit the invention in any way, and those skilled in the art will appreciate that modifications may be made without departing from the spirit and scope of the invention. Unless otherwise specified, reagents and equipment used in the following examples are commercially available products.
In this document, the terms "comprising," "including," "having," "containing," or any other similar term are all open ended terms that are intended to cover a non-exclusive inclusion. For example, a composition or article comprising a plurality of elements is not limited to only those elements listed herein, but may include other elements not explicitly listed but typically inherent to such composition or article. In addition, unless explicitly stated to the contrary, the term "or" refers to an inclusive "or" and not to an exclusive "or". For example, the condition "A or B" is satisfied in either case that A is true (or present) and B is false (or absent), A is false (or absent) and B is true (or present), and both A and B are true (or present). Furthermore, the terms "comprising," "including," "having," "containing," and their derivatives, as used herein, are intended to be open ended terms that have been specifically disclosed and are intended to cover both the terms "consisting of," and "consisting essentially of," as well as closed or semi-closed terms.
All features or conditions defined herein in terms of numerical ranges or percentage ranges are for brevity and convenience only. Accordingly, the description of a numerical range or percentage range should be considered to cover and specifically disclose all possible sub-ranges and individual values within the range, particularly integer values. For example, a range description of "1 to 8" should be taken as having specifically disclosed all sub-ranges such as 1 to 7, 2 to 8,2 to 6, 3 to 6, 4 to 8, 3 to 8, etc., particularly sub-ranges defined by all integer values, and should be taken as having specifically disclosed individual values such as 1,2, 3, 4, 5, 6, 7, 8, etc. within the range. The foregoing explanation applies to all matters of the invention throughout its entirety unless indicated otherwise, whether or not the scope is broad.
If an amount or other numerical value or parameter is expressed as a range, preferred range, or a series of upper and lower limits, then it is understood that any range, whether or not separately disclosed, from any pair of the upper or preferred value for that range and the lower or preferred value for that range is specifically disclosed herein. Furthermore, where a range of numerical values is recited herein, unless otherwise stated, the range is intended to include the endpoints thereof, and all integers and fractions within the range.
In this context, numerical values should be understood to have the accuracy of the numerical significance of the numerical values provided that the objectives of the present invention are achieved. For example, the number 40.0 is understood to cover a range from 39.50 to 40.49.
The raw materials adopted in the embodiment comprise engineering slag soil, water supply plant sludge, conditioning agents, auxiliary agents and soil body curing agents (comprising Portland cement, steel slag powder, industrial byproduct gypsum, composite admixture and surface active agents), wherein the engineering slag soil has a natural water content of 15% -50%, a plasticity index of 7% -25%, an organic matter content of less than 5%, the water supply plant sludge has a water content of 40% -80%, pH of 6% -8, an organic matter content of less than 25%, a mercury content of 0.02% -0.08 mg/kg, an arsenic content of 10% -80 mg/kg, a lead content of 10% -120 mg/kg, a copper content of 30% -90 mg/kg, a nickel content of 10% -80 mg/kg, the regenerated fine aggregate serving as an auxiliary agent is formed by processing building rubbish heavy concrete, mortar, stone blocks, tile and the like, a particle size of <4.75mm, a water absorption rate of 6% -15%, an apparent density of 2100% -250 kg/m 3, a stone powder content of 0% -1%, a crushing index of 20% -38%, a conditioning agent is produced by grinding raw lime, a calcium hydroxide, a calcium oxide content of the conditioning agent is 10% -80 mg/kg, a calcium hydroxide content of the like, a calcium oxide content of the conditioning agent is 10% -120 mg/kg, a calcium oxide content of the calcium oxide, a copper content of the calcium oxide is 30% -90 mg/kg, a calcium oxide content of the mineral powder is 5%, a magnesium sulfate, an active gypsum is produced by mixing the mineral powder, and the mineral powder is produced by grinding the mineral powder, and the mineral powder is more than the mineral gypsum, and the mineral powder, and the mineral aggregate has a magnesium sulfate. More specifically, the engineering slag soil is foundation pit soil in a new region of Shanghai city, foundation pit soil in Shandong province and lotus-leaf city, sludge in a water supply plant is sludge in a certain water supply plant of Shanghai city, regenerated fine aggregate is recycled fine aggregate of garbage in Shanghai city, quicklime is industrial grade quicklime in Shanghai city, silicate cement is sea snail P.O 42.5 cement, industrial byproduct gypsum is desulfurized gypsum in Shanghai city power plant, phosphogypsum is Guizhou phosphogypsum, and the composite admixture is prepared by a laboratory and comprises the following components of 30 parts of fly ash, 64.8 parts of slag powder, 5 parts of limestone powder and 0.2 part of calcium oxide. Unless otherwise indicated, the reagents and apparatus used were all commercially available products.
In the following examples, the performance test of the low carbon road subbase material doped with water supply plant sludge was performed as follows:
(1) Pretreating engineering dregs;
(2) Pretreating the sludge of a water supply plant;
(3) Proportioning raw materials according to the components of the low-carbon road subbase layer material doped with water supply plant sludge;
(4) Preparing a soil body curing agent;
(5) Obtaining the optimal water content and the maximum dry density through a compaction test;
(6) An unconfined compressive strength test was performed based on the test results of optimal moisture content and maximum dry density.
Example 1
The low-carbon road subbase layer material doped with the water supply plant sludge of the embodiment is prepared by the following method:
(1) And (3) pretreatment of engineering slag soil, wherein the natural water content of the engineering slag soil is 25%, and the water content of the engineering slag soil is controlled to be lower than 15% by adopting airing treatment.
(2) The water supply plant sludge pretreatment, namely, the water content of the water supply plant sludge is 70%, conditioning agents and auxiliary agents are needed to be mixed to regulate the water content and grading, the airing treatment is carried out, the water content of the mixture A is controlled to be lower than 15%, and the water content of the mixture A is tested.
(3) Raw materials are weighed according to the components of the low-carbon road subbase layer material doped with the water supply plant sludge, wherein the components of the raw materials are weighed according to the weight parts contained in 1000 parts of the low-carbon road subbase layer material doped with the water supply plant sludge, and the raw materials are as follows:
(4) And (3) preparing a soil body curing agent, namely sequentially feeding the silicate cement, the steel slag powder, the desulfurized gypsum, the composite admixture and the calcium hydroxide which are weighed in the step (3) into a stirrer according to a feeding sequence, stirring for 2-3 min, and discharging after uniformly mixing to obtain the soil body curing agent.
(5) And (3) preparing solidified soil, namely adding a soil body solidifying agent into the engineering dregs and the mixture mixed with the water supply plant sludge, and uniformly mixing to obtain the low-carbon road subbase material mixed with the water supply plant sludge.
The best water content and the maximum dry density are obtained through compaction test, and according to the test results of the best water content and the maximum dry density, an unconfined compressive strength test is carried out, and the leaching performance of the low-carbon road subbase material doped with the water supply plant sludge and the leaching performance of heavy metals in the embodiment are respectively shown in G1 and table 1 of figure 1.
Example 2
The low-carbon road subbase layer material doped with the water supply plant sludge of the embodiment is prepared by the following method:
(1) And (3) pretreatment of engineering slag soil, namely, the natural water content of the engineering slag soil is 15%, and the water content of the engineering slag soil is controlled to be lower than 10% by adopting airing treatment.
(2) The water supply plant sludge pretreatment, namely, the water content of the water supply plant sludge is 70%, conditioning agents and auxiliary agents are needed to be mixed to regulate the water content and grading, the airing treatment is carried out, the water content of the mixture A is controlled to be lower than 15%, and the water content of the mixture A is tested.
(3) Raw materials are weighed according to the components of the low-carbon road subbase layer material doped with the water supply plant sludge, wherein the components of the raw materials are weighed according to the weight parts of 1000 parts of the low-carbon road subbase layer material doped with the water supply plant sludge:
(4) And (3) preparing a soil body curing agent, namely sequentially adding the silicate cement, the steel slag powder, the desulfurized gypsum, the composite admixture and the sodium lignosulfonate weighed in the step (3) into a stirrer according to a feeding sequence, stirring for 2-3 min, and discharging after uniformly mixing to obtain the soil body curing agent.
(5) And (3) preparing solidified soil, namely adding a soil body solidifying agent into the engineering dregs and the mixture mixed with the water supply plant sludge, and uniformly mixing to obtain the low-carbon road subbase material mixed with the water supply plant sludge.
The best water content and the maximum dry density are obtained through compaction test, and according to the test results of the best water content and the maximum dry density, an unconfined compressive strength test is carried out, and the leaching performance of the low-carbon road subbase material doped with the water supply plant sludge and the leaching performance of heavy metals in the embodiment are respectively shown in G2 and table 1 of figure 1.
Example 3
The low-carbon road subbase layer material doped with the water supply plant sludge of the embodiment is prepared by the following method:
(1) And (3) pretreatment of engineering slag soil, wherein the natural water content of the engineering slag soil is 25%, and the water content of the engineering slag soil is controlled to be lower than 15% by adopting airing treatment.
(2) The water supply plant sludge pretreatment, namely, the water content of the water supply plant sludge is 70%, conditioning agents and auxiliary agents are needed to be mixed to regulate the water content and grading, the airing treatment is carried out, the water content of the mixture A is controlled to be lower than 15%, and the water content of the mixture A is tested.
(3) Raw materials are weighed according to the components of the low-carbon road subbase layer material doped with the water supply plant sludge, wherein the components of the raw materials are weighed according to the weight parts of 1000 parts of the low-carbon road subbase layer material doped with the water supply plant sludge:
(4) And (3) preparing a soil body curing agent, namely sequentially feeding the silicate cement, the steel slag powder, the phosphogypsum, the composite admixture and the calcium hydroxide which are weighed in the step (3) into a stirrer according to a feeding sequence, stirring for 2-3 min, and discharging after uniformly mixing to obtain the soil body curing agent.
(5) And (3) preparing solidified soil, namely adding a soil body solidifying agent into the engineering dregs and the mixture mixed with the water supply plant sludge, and uniformly mixing to obtain the low-carbon road subbase material mixed with the water supply plant sludge.
The best water content and the maximum dry density are obtained through compaction test, and according to the test results of the best water content and the maximum dry density, an unconfined compressive strength test is carried out, and the leaching performance of the low-carbon road subbase material doped with the water supply plant sludge and the leaching performance of heavy metals in the embodiment are respectively shown in G3 and table 1 of figure 1.
Example 4
The low-carbon road subbase layer material doped with the water supply plant sludge of the embodiment is prepared by the following method:
(1) And (3) pretreatment of engineering slag soil, wherein the natural water content of the engineering slag soil is 25%, and the water content of the engineering slag soil is controlled to be lower than 15% by adopting airing treatment.
(2) The water supply plant sludge pretreatment, namely, the water content of the water supply plant sludge is 70%, conditioning agents and auxiliary agents are needed to be mixed to regulate the water content and grading, the airing treatment is carried out, the water content of the mixture A is controlled to be lower than 15%, and the water content of the mixture A is tested.
(3) Raw materials are weighed according to the components of the low-carbon road subbase layer material doped with the water supply plant sludge, wherein the components of the raw materials are weighed according to the weight parts of 1000 parts of the low-carbon road subbase layer material doped with the water supply plant sludge:
(4) And (3) preparing a soil body curing agent, namely sequentially adding the silicate cement, the steel slag powder, the phosphogypsum, the composite admixture and the sodium lignosulfonate weighed in the step (3) into a stirrer according to a feeding sequence, stirring for 2-3 min, and discharging after uniformly mixing to obtain the soil body curing agent.
(5) And (3) preparing solidified soil, namely adding a soil body solidifying agent into the engineering dregs and the mixture mixed with the water supply plant sludge, and uniformly mixing to obtain the low-carbon road subbase material mixed with the water supply plant sludge.
The best water content and the maximum dry density are obtained through compaction test, and according to the test results of the best water content and the maximum dry density, an unconfined compressive strength test is carried out, and the leaching performance of the low-carbon road subbase material doped with the water supply plant sludge and the leaching performance of heavy metals in the embodiment are respectively shown in G4 and table 1 of figure 1.
Example 5
The low-carbon road subbase layer material doped with the water supply plant sludge of the embodiment is prepared by the following method:
(1) And (3) pretreatment of engineering slag soil, wherein the natural water content of the engineering slag soil is 25%, and the water content of the engineering slag soil is controlled to be lower than 15% by adopting airing treatment.
(2) The water supply plant sludge pretreatment, namely, the water content of the water supply plant sludge is 70%, conditioning agents and auxiliary agents are needed to be mixed to regulate the water content and grading, the airing treatment is carried out, the water content of the mixture A is controlled to be lower than 15%, and the water content of the mixture A is tested.
(3) Raw materials are weighed according to the components of the low-carbon road subbase layer material doped with the water supply plant sludge, wherein the components of the raw materials are weighed according to the weight parts of 1000 parts of the low-carbon road subbase layer material doped with the water supply plant sludge:
(4) And (3) preparing a soil body curing agent, namely sequentially adding the silicate cement, the steel slag powder, the desulfurized gypsum, the composite admixture and the sodium lignosulfonate weighed in the step (3) into a stirrer according to a feeding sequence, stirring for 2-3 min, and discharging after uniformly mixing to obtain the soil body curing agent.
(5) And (3) preparing solidified soil, namely adding a soil body solidifying agent into the engineering dregs and the mixture mixed with the water supply plant sludge, and uniformly mixing to obtain the low-carbon road subbase material mixed with the water supply plant sludge.
The best water content and the maximum dry density are obtained through compaction test, and according to the test results of the best water content and the maximum dry density, an unconfined compressive strength test is carried out, and the leaching performance of the low-carbon road subbase material doped with the water supply plant sludge and the leaching performance of heavy metals in the embodiment are respectively shown in G5 and table 1 of figure 1.
TABLE 1 toxicity of heavy metal leachates of Low carbon road underlayment materials doped with Water supply plant sludge
| Sample leaching concentration/mg/L | Cd | Cr | Ni | Cu | Zn | As | Hg |
| Example 1 | <0.01 | 0.11 | 0.03 | 0.12 | <0.01 | 0.008 | 0.00004 |
| Example 2 | <0.01 | 0.10 | <0.02 | 0.10 | <0.01 | 0.008 | 0.00003 |
| Example 3 | <0.01 | 0.06 | 0.02 | 0.07 | <0.01 | 0.005 | 0.00002 |
| Example 4 | <0.01 | 0.11 | 0.03 | 0.14 | <0.01 | 0.008 | 0.00004 |
| Example 5 | 0.01 | 0.12 | 0.04 | 0.15 | <0.01 | 0.009 | 0.00005 |
| CECS 397-2015 | ≤0.1 | ≤1.5 | - | ≤2.0 | - | ≤0.6 | ≤0.02 |
(Note: soil body curing agent cost is reduced by 10-40% compared with cement, CO 2 emission is reduced by 50-80% compared with cement.)
As can be seen from FIG. 1, the unconfined compressive strength of the low-carbon road subbase material 7d doped with the water supply plant sludge is 2.1-4.1 MPa, and the unconfined compressive strength requirement (2.0-4.0 MPa) of the low-carbon road subbase material 7d for the medium and light traffic and the heavy traffic of the secondary and lower roads in the expressway and the primary road is met. The water content, grading and plasticity index of the system are regulated by using the auxiliary agent, the environmental safety of the system is regulated by using the conditioner, and meanwhile, the C-A-S-H, C-S-H, C-A-H gel with low CA-Si ratio (< 0.8) is generated by using the soil body curing agent for reaction, so that the strength is provided for the low-carbon road subbase material doped with the water supply plant sludge, and the leaching of heavy metal ions can be reduced.
As can be seen from Table 1, the toxicity of the heavy metal leachate of the low-carbon road subbase material doped with the water supply plant sludge meets the standard requirements. During the solidification process, a large amount of C-S-H, C-A-H, AFt and other products are generated, and heavy metal ions are solidified/stabilized through physical wrapping, precipitation, adsorption and ion replacement. Particularly for heavy metal arsenic, ca 2+ generated in the hydration process of the low-carbon composite cementing material can generate calcium-arsenic combination with free AsO 4 3-、HAsO4 2- in pore liquid, ca 2+ and HAsO 4 2- form relatively indissolvable CaHAsO 4, when HAsO 4 2- is dissociated, caHAsO 4 and Ca 3(AsO4)2 are formed, and in addition, as is co-precipitated or adsorbed on amorphous CaCO 3, so that the aim of permanently and stably fixing arsenic is fulfilled, and the arsenic fixing rate is up to 99%.
According to the invention, by selecting the components of the engineering slag soil curing agent and adopting engineering slag soil, water supply plant sludge, conditioning agent, auxiliary agent, silicate cement, steel slag powder, industrial byproduct gypsum, composite admixture and surfactant, the low-carbon road subbase material doped with water supply plant sludge, which meets the standard performance requirements of JTG/T F-2015, environmental safety detection standard of cement-based recycled materials (CECS 397-2015) and the like, is prepared by adjusting the formula of the engineering slag soil curing agent, so that the production cost of the low-carbon road subbase material is reduced, and the resource utilization level of solid wastes such as engineering slag soil, water supply plant sludge, steel slag powder, industrial byproduct gypsum and the like is improved. The cost of the low-carbon road subbase material doped with the water supply plant sludge is reduced by 30-80% compared with that of the traditional road subbase material, and the emission of CO 2 is reduced by 30-60% compared with that of the traditional road subbase material.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The low-carbon road subbase material doped with the water supply plant sludge comprises, by weight, 0.5-4% of a conditioning agent, 2-20% of the water supply plant sludge, 0.01-30% of an auxiliary agent, 50-95% of engineering slag soil and 5-15% of a soil body curing agent;
the conditioning agent is selected from quicklime and/or gray calcium, and the effective calcium oxide content is more than 70%;
The water content of the water supply plant sludge is 40% -80%, the pH is 6-8, the organic matter content is less than 25%, the mercury content is 0.02-0.08 mg/kg, the arsenic content is 10-80 mg/kg, the lead content is 10-120 mg/kg, the copper content is 30-90 mg/kg, and the nickel content is 10-80 mg/kg;
The auxiliary agent is regenerated fine aggregate, the regenerated fine aggregate is formed by processing concrete, mortar, stone blocks and bricks and tiles in the construction waste, the particle size is smaller than 4.75 mm, the water absorption rate is 6-15%, the apparent density is 2100-2500 kg/m 3, the stone powder content is 0-1%, and the crushing index is 20-38%;
The natural water content of the engineering slag soil is 15% -50%, the plasticity index is 7% -25%, and the organic matter content is less than 5%;
The soil body curing agent comprises 15-30% of Portland cement, 15-30% of steel slag powder, 20-30% of industrial byproduct gypsum, 30-50% of composite admixture, 1-5% of pH regulator and 0.01-0.8% of surfactant, wherein the composite admixture is formed by compounding and grinding fly ash, slag powder, limestone powder and an exciting agent.
2. The low-carbon road subbase material doped with water supply plant sludge according to claim 1, wherein the low-carbon road subbase material doped with water supply plant sludge comprises the following components, by weight, 2 parts of a conditioning agent, 10 parts of water supply plant sludge, 10 parts of an auxiliary agent, 70 parts of engineering slag soil, 8 parts of a soil body curing agent, or
The low-carbon road subbase material doped with the water supply plant sludge comprises the following components, by weight, 1 part of a conditioning agent, 10 parts of the water supply plant sludge, 5 parts of an auxiliary agent, 78 parts of engineering slag soil, 6 parts of a soil body curing agent, or
The low-carbon road subbase layer material doped with the water supply plant sludge comprises the following components, by weight, 1 part of a conditioning agent, 5 parts of the water supply plant sludge, 10 parts of an auxiliary agent, 79 parts of engineering slag soil, 5 parts of a soil body curing agent, or
The low-carbon road subbase layer material doped with the water supply plant sludge comprises the following components, by weight, 2 parts of a conditioning agent, 10 parts of the water supply plant sludge, 20 parts of an auxiliary agent, 60 parts of engineering slag soil, 8 parts of a soil body curing agent, or
The low-carbon road subbase material doped with the water supply plant sludge comprises, by weight, 1 part of a conditioning agent, 10 parts of the water supply plant sludge, 10 parts of an auxiliary agent, 74 parts of engineering slag soil and 5 parts of a soil body curing agent.
3. The low-carbon road subbase material doped with water supply plant sludge according to claim 1 or 2, wherein the surfactant in the soil body curing agent is one or more of lignosulfonate and triethanolamine.
4. The low-carbon road subbase material doped with water supply plant sludge according to claim 1 or 2, wherein the steel slag powder comprises 35% -50% of CaO, 5% -10% of Fe 2O3：20%~35%,SiO2% and less than or equal to 15% of f-CaO;
the industrial byproduct gypsum comprises one or more of phosphogypsum and desulfurized gypsum, the purity is more than 80%, the pH is 5-12, and the fineness is 80 mu m and the screen residue of a square hole screen is less than 5%;
In the composite admixture, the weight percentage of the fly ash is 20-50%, the weight percentage of the slag powder is 50-80%, the weight percentage of the limestone powder is 0.01-10%, and the weight percentage of the excitant is 0.01-2%, wherein the excitant is selected from CaO, naOH or gypsum.
5. The low carbon roadway underlayment material incorporating water mill sludge of claim 4, wherein said activator is CaO.
6. The method for preparing a low-carbon road subbase material doped with water supply plant sludge according to any one of claims 1 to 5, comprising the steps of:
(1) The engineering slag soil pretreatment, namely, the natural water content of the engineering slag soil is 15% -50%, the airing treatment is needed, and the water content of the engineering slag soil is controlled to be lower than 15%;
(2) The method comprises the steps of (1) pretreating the sludge in a water supply plant, namely, mixing the sludge with 40% -80% of water content of the sludge in the water supply plant uniformly by adding a predetermined amount of conditioning agent and auxiliary agent, regulating the water content and grading, airing to obtain a mixture A, testing the water content of the mixture A, and controlling the water content of the mixture A to be lower than 15%;
(3) Preparing a soil body curing agent, namely sequentially feeding the weighed silicate cement, steel slag powder, industrial byproduct gypsum, a composite admixture, a pH regulator and a surfactant into a stirrer according to a feeding sequence, stirring for 2-3 min, uniformly mixing, and discharging to obtain the soil body curing agent;
(4) Determining the optimal water content and the maximum dry density of the low-carbon road subbase material doped with the water supply plant sludge through a compaction test, and calculating the water adding amount of the low-carbon road subbase material doped with the water supply plant sludge according to the optimal water content and the maximum dry density;
(5) Adding the pretreated engineering slag soil and the mixture A into a stirrer, stirring for 2-3 min, uniformly mixing, adding water, reserving 2% of water according to the preset water adding mass, stirring for 2-min, uniformly stirring, sealing and soaking for 12-36 h, adding a preset amount of soil body curing agent in the step (4) and reserved 2% of water into a test piece 1-h before molding, uniformly stirring, molding, and demolding to obtain the low-carbon road subbase material doped with water supply plant sludge.
7. Use of the low carbon road underlayment material doped with water mill sludge according to any of claims 1 to 5 in road underlayments, both in highways and primary highways, light traffic and underlayments of roads of heavy, medium and light traffic below secondary.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112679175A (en) * | 2020-12-29 | 2021-04-20 | 苏州吴中供水有限公司 | Lime comprehensive stabilized soil |
| CN115368035A (en) * | 2022-08-10 | 2022-11-22 | 内蒙古工业大学 | Based on Ca 2+ 、Na + Synergistic activated multi-element solid waste low-carbon cementing material special for pavement base and preparation method thereof |
| CN115724629A (en) * | 2022-11-17 | 2023-03-03 | 上海申环环境工程有限公司 | Curing agent stabilized soil for mucky muck and preparation method thereof |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112679175A (en) * | 2020-12-29 | 2021-04-20 | 苏州吴中供水有限公司 | Lime comprehensive stabilized soil |
| CN115368035A (en) * | 2022-08-10 | 2022-11-22 | 内蒙古工业大学 | Based on Ca 2+ 、Na + Synergistic activated multi-element solid waste low-carbon cementing material special for pavement base and preparation method thereof |
| CN115724629A (en) * | 2022-11-17 | 2023-03-03 | 上海申环环境工程有限公司 | Curing agent stabilized soil for mucky muck and preparation method thereof |
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