CN106830828A - C40~C50 high performance concretes and cooperation stirring means - Google Patents

Abstract

A C40-C50 high-performance concrete and its mix design and mixing method. Traditional concrete mix design follows the Paulomey formula, which is the relationship between concrete strength and water-cement ratio. In this mix design, the water-cement ratio is obtained through theoretical calculation. This invention comprises: coarse aggregate, fine aggregate, cement, admixtures, mineral admixtures, and mixing water. The mix design and mixing method are carried out in four steps: (1) mix design preparation stage; (2) quality requirements of each component material in the mix design; (3) stage of determining the unit material dosage according to the mix design; and (4) mix design trial mixing stage. This invention relates to the field of civil engineering material preparation, and particularly to the mix design and mixing of C40-C50 high-performance concrete.

Description

C40～C50 High Performance Concrete and Mixing Method

Technical field:

The application of the present invention relates to the field of civil engineering ingredients, in particular to a C40-C50 high-performance concrete and a mixing and mixing method.

Background technique:

In the traditional sense, the concrete mix ratio design follows the Borrome formula, that is, the relationship between concrete strength and water-cement ratio. In this mix ratio, the water-cement ratio is obtained through theoretical calculation, which is also the core of the early concrete mix ratio. The mix design and trial mixing process is extremely cumbersome, and the success rate is very low. A kind of concrete with high fluidity, high volume stability, suitable strength and high durability is urgently needed in construction. The concrete is composed of at least six components such as cement, mineral admixtures (represented by fly ash, granulated blast furnace slag powder and silica fume), water, coarse aggregate and fine aggregate, and admixtures. It is a new type of concrete, which is very different from the traditional concrete.

Invention content:

The purpose of the present invention is to provide a C40-C50 high-performance concrete and a mixing method thereof.

Above-mentioned purpose realizes by following technical scheme:

A C40-C50 high-performance concrete, the composition of which includes: coarse aggregate, fine aggregate, cement, admixture, mineral admixture and mixing water, and the mixing ratio design and mixing method are divided into four steps. : (1) Mixing ratio preparation stage; (2) The quality requirements of each component material of the mixing ratio; (3) The stage of determining the amount of single material according to the mixing ratio; (4) The mixing ratio trial mixing stage.

For the C40-C50 high-performance concrete, the preparation stage of the mix ratio includes: determining the strength of the concrete for trial mixing, concentrated mixing of the concrete, and for those with a higher management level, the guaranteed rate of concrete strength is 95%, and the standard deviation of concrete strength is preferably 4 If the management level is poor, the concrete strength guarantee rate is 95%, and the standard deviation of concrete strength is preferably 4 or 5; for sporadic mixing of concrete, the management level is high, the concrete strength guarantee rate is 95%, and the concrete strength standard deviation is preferably 5; For those with poor management level, the guaranteed rate of concrete strength shall be 95%, and the standard deviation of concrete strength shall be 5 or 6; the trial strength of concrete can be calculated according to the following formula;

Where fcu.0≧fcu.k＋1.645σ

Where fcu.0 ----- concrete preparation strength;

Where fcu.k ----- standard value of concrete cube compressive strength;

σ----Standard deviation of concrete strength;

For the C40-C50 high-performance concrete, the quality requirements of the various components of the mix ratio are: A. Coarse aggregate: the nominal maximum particle size of the coarse aggregate for C40 concrete should not be greater than 31.5mm, and the nominal maximum particle size for the coarse aggregate for C50 concrete The maximum particle size should not be greater than 26.5mm. The two should preferably use continuous grading hammer crushing or impact crushing crushed stone. The crushed stone masterbatch should preferably be rocks such as basalt, andesite, limestone, etc., and its uniaxial compressive strength should be greater than 100MPa. The crushing value should be less than 10%, the needle flake content should be less than 10%, the mud content should be less than 0.5%, the apparent density of crushed stone should be greater than 2.70g/cm3, and the content of other harmful impurities should be less than the corresponding standard value; B. Fine Aggregate: River sand in Zone II is preferred. The fineness modulus of the sand should be 2.4-3.0, the mud content should be less than 1.5%, the apparent density should be greater than 2.70 g/cm3, and the loose bulk density should be greater than 1500kg/m3. The workability meets the construction requirements, and clean machine-made sand can also be used; C. Cement: Ordinary Portland cement is preferred, and Portland cement can be used for concrete with high early strength requirements or large amounts of mineral admixtures. The cement strength grade is preferably grade 42.5. When the quality of raw materials is poor, grade 52.5 cement can be used; D. Admixture: high-performance water reducer or high-efficiency water reducer is preferred, and the representative varieties are in the order of preference: polycarboxylate salt series, amino carboxylate series, naphthalene series, amino sulfonate series, melamine series (melamine sulfonate formaldehyde condensate); E. Mineral admixtures: Class II fly ash is preferred (important projects also Class I fly ash can be used), mineral admixtures such as S95 granulated blast furnace slag powder are preferred; F. Mixing water: drinking water is preferred for mixing concrete, and other water sources that meet JGJ63-2006 can also be used water.

For the C40-C50 high-performance concrete, the stage of determining the dosage of a single material according to the mix ratio is as follows: (1) The C40-C50 high-performance concrete needs to use more than two kinds of cementitious materials. Considering the accuracy of the image, the mix ratio The water-cement ratio in the traditional sense is changed to water-binder ratio; (2) According to engineering experience, the water-binder ratio of C40~C50 high-performance concrete should be controlled between 0.31~0.38. The specific value selection criteria are: (a) the value of C40 concrete should be between 0.35 and 0.38, and the value of C50 concrete should be between 0.31 and 0.34; (b) the quality of the raw materials for the concrete is good, and the water-binder ratio should be a large value; otherwise , the quality of concrete raw materials is poor, and the water-binder ratio should be taken as a small value. In short, regardless of the quality of the raw materials that make up the concrete, it is easier to obtain the required trial strength and meet the durability requirements if the water-binder ratio of the concrete is smaller; (3) On the premise that the performance and quality of the raw materials are determined, according to Based on experience and experience, preliminarily draw up the size of the expected water-binder ratio, but do not exceed the previously-prepared water-binder ratio during trial mixing; (4) Calculate and determine the amount of various materials for one cubic meter of concrete according to the assumed apparent density method: (a). The apparent density of C40-C50 high-performance concrete is 2450±50 kg/m3. When the measured apparent density of fresh concrete and its error are within ±2%, no correction is required; otherwise, the apparent density should be corrected; (b) .Unilateral amount of cement: According to the actual strength of cement combined with testing and construction experience, the mix ratio of C40 concrete can be 220kg~270kg; the ratio of C50 concrete can be 260kg~330kg; Location, quality of fly ash, and different requirements of users for the strength of concrete at different ages and other limiting factors, the amount of fly ash can be selected to account for 15% to 35% of the cementitious material; (d). Granulated blast furnace ground slag The amount of unilateral powder can be selected according to the restrictive factors such as the mixing ratio, use environment, location, quality of granulated blast furnace fine slag powder, and different requirements of users for the strength of concrete at different ages. 15% to 35% of the material; (e). The total amount of mineral admixtures should be between 30% and 40% of the total amount of cementitious materials; (f). (c) to (d) mineral admixtures can be According to the construction needs, one or several types of mineral admixtures can be used, but not limited to these two types. Other types of mineral admixtures can also be selected after passing the test; (g). The sand rate is determined. According to the gradation of sand, fineness modulus, maximum particle size of coarse aggregate, water-cement ratio, engineering needs, concrete transportation, and different delivery methods, the sand rate can be selected generally from 35% to 40%; (h). According to the plan Calculate the unilateral water consumption according to the cement dosage and water-binder ratio; (i). After the above materials are determined, the amount of coarse and fine aggregates can be calculated; (j). High-efficiency water reducers are preferred, and representative varieties are prioritized The order of selection is: polycarboxylate series, amino carboxylate series, naphthalene series, sulfamic acid salt series, melamine series (melamine sulfonate formaldehyde condensate); (5) mineral admixture: preferred Ⅰ Grade-grade fly ash (grade II fly ash can also be used for general projects and unimportant projects), and mineral admixtures such as S95 grade granulated blast furnace slag powder are preferred; (6) Three different types of concrete are selected for each strength grade The amount of cement used for trial mixing concrete, the difference between the amount of each type of cement is 20kg, the control workability remains unchanged, and the water-cement ratio is calculated based on the final actual water consumption. After meeting the requirements of slump and slump loss over time, three different mix ratios are molded to carry out strength tests, and the strength of each age is tested. The 28-day compressive strength meets the test strength requirements, and cement and other cementitious materials The one with the lowest sum cost shall be used as the benchmark mix ratio; (7) According to the amount of unilateral raw materials determined above and the expected water-binder ratio, different mix ratios shall be mixed with 25-35 liters of concrete to test the workability and strength of the concrete mixture. .

The mixing and mixing method of the C40-C50 high-performance concrete: in the mixing ratio trial mixing stage, the concrete mixing ratio mixing process is as follows: (1) add the weighed coarse aggregate and fine aggregate in sequence In the mixer, stir for 15s, then add 65% water, stir for 20-30s, add cement and admixture, stir for 40-60s, add 25% water and high-performance water reducer, stir for 60-90s, while stirring While observing the workability of the concrete, if the fluidity of the concrete is low, add the remaining 10% water; If the workability meets the requirements, the material will be discharged for the next step, and finally the actual water consumption and the water-cement ratio shall be verified. The water-cement ratio shall not be greater than the expected water-cement ratio drawn up in advance; (2) If the workability of the concrete does not meet the requirements , firstly, the compatibility between the high-performance superplasticizer and cement should be considered, and secondly, the compatibility with other cementitious materials and the high-performance superplasticizer or the quality of the aggregate (surface characteristics and cleanliness, etc.); On the contrary, the calculated water consumption is slightly surplus and the workability of the concrete fully meets the construction needs, which is the most ideal result; (3) After the mixing is completed, check the workability of the freshly mixed concrete, and put it into a container with a cover after it meets the requirements Stand still for a period of time to detect the loss of concrete slump over time. After this index meets the requirements, the water-binder ratio is finally approved; (4) After the time-lapse loss of slump measured according to the time interval of mixing, transportation and construction control meets the requirements, measure The apparent density of concrete. When the error between the density and the assumed apparent density is less than 2%, the amount of each material in the mix ratio may not be adjusted. On the contrary, when the error is greater than or equal to 2%, it is necessary to correct and adjust the amount of each material in the mix ratio, and finally approve the mix ratio. Apparent density; (5) Molded concrete specimens, covered with plastic film, placed at 20±2°C, and cured in an environment with a relative humidity greater than 95% until demoulding, and the demoulded specimens were placed at 20±2 ℃, relative humidity greater than 95% in the moisture curing room to the required age, and test the strength of each age; (6) The mixing ratio of the other two cements is also tested according to the above method, and the strength of each age is tested After the completion, the strength of the three groups of mix ratios at the age of 28 days was compared, and the one with good workability, high strength and minimum comprehensive cost was selected as the benchmark mix ratio.

In the C40-C50 high-performance concrete blending and mixing method, the equipment used is a twin-horizontal shaft concrete forced mixer, and it is ensured that the actual water-cement ratio is not greater than the expected water-cement ratio during the trial mixing process. .

Beneficial effects of the present invention:

1. The C40～C50 high-performance concrete of the present invention has high strength, many types of constituent materials, and many factors affecting strength. Among many factors affecting strength, the water-cement ratio accounts for the first place. Therefore, when the mix ratio of this kind of concrete is When designing, it is difficult to prepare if the water-cement ratio is determined by theoretical calculation.

The C40-C50 high-performance concrete of the present invention is a subversion of the traditional concrete mix ratio design method, and its core is reflected in the determination of the water-cement ratio, which is an empirical value rather than a calculated value, or in other words, the water-cement ratio of high-performance concrete It is not theoretically calculated, and the concrete mix ratio is not a simple problem that can be solved only by calculation and design, but on the basis of practical experience accumulation and continuous summary, an expected water-cement ratio is drawn up in advance, and the trial mix must not exceed this value. value, combined with the practical conclusions obtained from a series of rigorous experiments with a targeted and directional orientation.

The C40-C50 high-performance concrete of the present invention takes this as the core to design the concrete mix ratio, which is simple and clear, has a high success rate, and is very satisfactory in cost performance.

The C40-C50 high-performance concrete of the present invention has been proved by a large number of engineering practices that the present invention is novel and has strong operability and practicability.

detailed description:

Example 1:

A C40-C50 high-performance concrete, the composition of which includes: coarse aggregate, fine aggregate, cement, admixture, mineral admixture and mixing water, and the mixing ratio design and mixing method are divided into four steps. : (1) Mixing ratio preparation stage; (2) The quality requirements of each component material of the mixing ratio; (3) The stage of determining the amount of single material according to the mixing ratio; (4) The mixing ratio trial mixing stage.

Example 2:

According to the C40～C50 high-performance concrete described in Example 1, the preparation stage of the mix ratio includes: determining the strength of the concrete for trial mixing, concentrated mixing of the concrete, and for those with a higher management level, the concrete strength guarantee rate is 95%, and the concrete strength is 95%. The standard deviation can be 4; if the management level is poor, the concrete strength guarantee rate should be 95%, and the concrete strength standard deviation should be 4 or 5; for sporadic mixing concrete, the management level is high, the concrete strength guarantee rate should be 95%, and the concrete strength standard deviation should be 95%. The difference can be taken as 5; if the management level is poor, the concrete strength guarantee rate should be taken as 95%, and the standard deviation of concrete strength should be taken as 5 or 6; the strength of concrete trial mix can be calculated according to the following formula:

Where fcu.0≧fcu.k＋1.645σ

Where fcu.0 ----- concrete preparation strength;

Where fcu.k ----- standard value of concrete cube compressive strength;

σ----Standard deviation of concrete strength;

Example 3:

According to the C40～C50 high-performance concrete described in embodiment 1, the quality requirements of each component material of the described mix ratio are: A. coarse aggregate: the nominal maximum particle size of coarse aggregate for C40 concrete should not be greater than 31.5mm, and for C50 concrete The nominal maximum particle size of the coarse aggregate should not be greater than 26.5mm. Continuously graded hammer crushed or impact crushed crushed stone should be preferred for the two. Basalt, andesite, limestone and other rocks should be selected as the crushed stone master material, and the uniaxial compressive strength should be greater than 100MPa, the crushing value of gravel should be less than 10%, the content of needle flakes should be less than 10%, the mud content should be less than 0.5%, the apparent density of gravel should be greater than 2.70g/cm3, and the content of other harmful impurities should be less than the corresponding standard value ; B. Fine aggregate: river sand in zone II is preferred, the fineness modulus of the sand should be 2.4-3.0, the mud content should be less than 1.5%, the apparent density should be greater than 2.70 g/cm3, and the loose bulk density should be greater than 1500kg /m3, if the workability meets the construction requirements, clean machine-made sand can also be used; C. Cement: Ordinary Portland cement is preferred, and silicic acid can be used for concrete with high early strength requirements or large amounts of mineral admixtures salt cement. The cement strength grade is preferably grade 42.5. When the quality of raw materials is poor, grade 52.5 cement can be used; D. Admixture: high-performance water reducer or high-efficiency water reducer is preferred, and the representative varieties are in the order of preference: polycarboxylate salt series, amino carboxylate series, naphthalene series, amino sulfonate series, melamine series (melamine sulfonate formaldehyde condensate); E. Mineral admixtures: Class II fly ash is preferred (important projects also Class I fly ash can be used), mineral admixtures such as S95 granulated blast furnace slag powder are preferred; F. Mixing water: drinking water is preferred for mixing concrete, and other water sources that meet JGJ63-2006 can also be used water.

Example 4:

According to the C40-C50 high-performance concrete described in Example 1, the stage of determining the dosage of a single material according to the mix ratio is as follows: (1) C40-C50 high-performance concrete needs to use more than two cementitious materials, considering that the image is accurate , This mix ratio changes the traditional water-cement ratio to water-binder ratio; (2) According to engineering experience, the water-binder ratio of C40~C50 high-performance concrete should be controlled between 0.31~0.38. The specific value selection criteria are: (a) the value of C40 concrete should be between 0.35 and 0.38, and the value of C50 concrete should be between 0.31 and 0.34; (b) the quality of the raw materials for the concrete is good, and the water-binder ratio should be a large value; otherwise , the quality of concrete raw materials is poor, and the water-binder ratio should be taken as a small value. In short, regardless of the quality of the raw materials that make up the concrete, it is easier to obtain the required trial strength and meet the durability requirements if the water-binder ratio of the concrete is smaller; (3) On the premise that the performance and quality of the raw materials are determined, according to Based on experience and experience, preliminarily draw up the size of the expected water-binder ratio, but do not exceed the previously-prepared water-binder ratio during trial mixing; (4) Calculate and determine the amount of various materials for one cubic meter of concrete according to the assumed apparent density method: (a). The apparent density of C40-C50 high-performance concrete is 2450±50 kg/m3. When the measured apparent density of fresh concrete and its error are within ±2%, no correction is required; otherwise, the apparent density should be corrected; (b) .Unilateral amount of cement: According to the actual strength of cement combined with testing and construction experience, the mix ratio of C40 concrete can be 220kg~270kg; the ratio of C50 concrete can be 260kg~330kg; Location, quality of fly ash, and different requirements of users for the strength of concrete at different ages and other limiting factors, the amount of fly ash can be selected to account for 15% to 35% of the cementitious material; (d). Granulated blast furnace ground slag The amount of unilateral powder can be selected according to the restrictive factors such as the mixing ratio, use environment, location, quality of granulated blast furnace fine slag powder, and different requirements of users for the strength of concrete at different ages. 15% to 35% of the material; (e). The total amount of mineral admixtures should be between 30% and 40% of the total amount of cementitious materials; (f). (c) to (d) mineral admixtures can be According to the construction needs, one or several types of mineral admixtures can be used, but not limited to these two types. Other types of mineral admixtures can also be selected after passing the test; (g). The sand rate is determined. According to the gradation of sand, fineness modulus, maximum particle size of coarse aggregate, water-cement ratio, engineering needs, concrete transportation, and different delivery methods, the sand rate can be selected generally from 35% to 40%; (h). According to the plan Calculate the unilateral water consumption according to the cement dosage and water-binder ratio; (i). After the above materials are determined, the amount of coarse and fine aggregates can be calculated; (j). High-efficiency water reducers are preferred, and representative varieties are prioritized The order of selection is: polycarboxylate series, amino carboxylate series, naphthalene series, sulfamate series, melamine series (melamine sulfonate formaldehyde condensate); (5) mineral admixture: preferred Ⅰ Class II fly ash (class II fly ash can also be used for general projects and unimportant projects), and mineral admixtures such as S95 grade granulated blast furnace slag powder are preferred; (6) Three different types of concrete are selected for each strength grade The amount of cement used for trial mixing concrete, the difference between the amount of each type of cement is 20kg, the control workability remains unchanged, and the water-cement ratio is calculated based on the final actual water consumption. During operation, the water-cement ratio must be controlled within the expected range. After the performance and slump loss over time meet the requirements, three different mix ratios are molded to carry out strength tests, and the strength of each age is tested. The 28-day compressive strength meets the test strength requirements, and cement and other cementitious materials The one with the lowest sum cost shall be used as the benchmark mix ratio; (7) According to the amount of unilateral raw materials determined above and the expected water-cement ratio, different mix ratios shall be mixed with 25-35 liters of concrete to test the workability and strength of the concrete mixture. .

Example 5:

According to the mixing and mixing method of C40-C50 high-performance concrete described in Example 1, in the mixing ratio test mixing stage, the concrete mixing ratio mixing process is: (1) the weighed coarse aggregate, fine aggregate Add to the mixer in sequence, stir for 15 seconds, then add 65% water, stir for 20-30 seconds, add cement and admixtures, stir for 40-60 seconds, add 25% water and high-performance water reducing agent, stir for 60-30 seconds For 90 seconds, observe the workability of the concrete while stirring. If the fluidity of the concrete is low, add the remaining 10% water; 90s, if the workability of the concrete meets the requirements, the material will be discharged for the next step, and finally the actual water consumption and the water-cement ratio shall be verified, and the water-cement ratio shall not be greater than the expected water-cement ratio drawn up in advance; (2) If the concrete If the performance does not meet the requirements, the compatibility between the high-performance water reducer and cement should be considered first, and then the compatibility with other cementitious materials and the high-performance water reducer or the quality of the aggregate (surface characteristics and cleanliness) should be considered. degree, etc.); on the contrary, the calculated water consumption is slightly surplus and the workability of the concrete fully meets the construction needs, which is the most ideal result; (3) After the mixing is completed, the workability of the freshly mixed concrete is tested, and it is put into the The time-lapse loss of concrete slump is detected after standing in a container with a cover for a period of time, and the water-binder ratio is finally approved after this index meets the requirements; (4) The time-lapse loss of slump measured according to the time interval of mixing, transportation and construction control meets the requirements After the requirement, measure the apparent density of the concrete. When the error between the density and the assumed apparent density is less than 2%, the amount of each material in the mix ratio may not be adjusted. On the contrary, when the error is greater than or equal to 2%, it is necessary to correct and adjust the amount of each material in the mix ratio. Final approval The apparent density of the mix ratio; (5) The molded concrete specimen is covered with a plastic film, placed in an environment of 20±2°C and a relative humidity greater than 95% for curing until demoulding, and the demoulded specimen is placed At 20±2°C, in a moisture curing room with a relative humidity greater than 95%, it is cured to the required age, and the strength of each age is tested; (6) The mixing ratio of the other two cements is also tested according to the above method. After all the strength tests are completed, the three groups of mix ratios are compared for 28-day age strength, and the one with good workability, high strength and minimum comprehensive cost is selected as the benchmark mix ratio.

Embodiment 6:

According to the C40～C50 high-performance concrete mixing and mixing method described in embodiment 1 or 2 or 3 or 4 or 5, the equipment used is a twin-horizontal shaft concrete forced mixer, and it is ensured that in the mixing ratio trial mixing process, Ensure that the actual water-binder ratio is not greater than the expected water-binder ratio.

Claims (5)

1. a kind of C40~C50 high performance concretes, its composition includes：Coarse aggregate, fine aggregate, cement, additive, mineral are blended Material and mixing water, it is characterized in that：Described mix-design and stirring means is divided into four steps to be carried out：（1）Match ratio is accurate The standby stage；（2）Each composition material quality requirement of match ratio；（3）Determine the folk prescription material usage stage according to match ratio；（4）Match ratio Trial mix stage, the described match ratio preparatory stage includes：Determine the concrete strength of trial, concentrated compactness concrete manages water Flat the higher person, probability of ensuring strength of concrete takes 95%, concrete strength standard deviation desirable 4；Managerial skills chump, strong concrete Degree fraction takes 95%, and concrete strength standard deviation preferably takes 4 or 5；Fragmentary ready-mixed concrete, managerial skills the higher person, concrete The strength factor of assurance takes 95%, concrete strength standard deviation desirable 5；Managerial skills chump, probability of ensuring strength of concrete takes 95%, mixes Solidifying soil tension variance preferably takes 5 or 6；Concrete optimum intensity can be calculated as follows；

Wherein：Fcu.0≤fcu.k+1.645 σ

In formula：Fcu.0 --- -- concrete preparation strength；

In formula：Fcu.k --- -- characteristic value of cubic concrete compressive strength；

σ ----concrete strength standard deviation.

2. C40~C50 high performance concretes according to claim 1, it is characterized in that：Each composition material of described match ratio Quality requirement is：A. coarse aggregate：C40 concrete coarse aggregate nominal maximum particle diameter is not preferably greater than 31.5mm, and C50 concrete is used Coarse aggregate nominal maximum particle diameter is not preferably greater than 26.5mm, and the two preferably preferentially hammers broken or impact crushing rubble into shape from continuous grading, broken The rocks such as stone master batch preferably preferred basalt, andesite, limestone, its uniaxial compressive strength is preferably greater than 100MPa, rubble crush values Preferably less than 10%, elongated particles are preferably less than 10%, and clay content is preferably less than 0.5%, and rubble apparent density is preferably greater than 2.70g/cm3, its He is less than respective standard setting at objectionable impurities content；B. fine aggregate：Preferential to select II area's river sand, the modulus of fineness of sand is preferably 2.4~3.0, clay content is preferably less than 1.5%, and apparent density is preferably greater than 2.70 g/cm3, and loose bulk density is preferably greater than 1500kg/m3, If workability meets construction requirement, it is also possible to from clean Machine-made Sand；C. cement：Portland cement preferentially is selected, it is right The concrete of early strength requirement height or high content mineral admixtures, can select portland cement.Strength of cement grade is preferential From 42.5 grades, when raw material quality is poor, 52.5 class g cements are can select；D. additive：It is preferential from high-performance water reducing agent or High efficiency water reducing agent, representative kind is by the preferential order selected：Polycarboxylate system, aminocarboxylate system, naphthalene system, sulfamic acid Salt system, melamine system（Condensate of melamine sulfonate and formaldehyde）；E. mineral admixture：Preferentially select II grade of flyash（Important work Journey also can select I grade of flyash）, it is preferential from mineral admixtures such as S95 grades of ground granulated blast furnace slag powders；F. mixing water： It is preferential to select drinking water mixing concrete, it is also possible to use the water for meeting other water sources of JGJ63-2006.

3. C40~C50 high performance concretes according to claim 1 and 2, it is characterized in that：Described determines according to match ratio The folk prescription material usage stage is：（1）C40~C50 high performance concretes need to use two or more Binder Materials, it is contemplated that image Accurately, the ratio of mud is changed to water-cement ratio；（2）According to engineering experience, the water-cement ratio of C40~C50 high performance concretes is preferably controlled Between 0.31~0.38.Specifically value standard is：（a）C40 concrete values are preferably between 0.35~0.38, and C50 concrete takes Value is preferably between 0.31~0.34；（b）Composition concrete raw material quality better, water-cement ratio can take large values；Conversely, concrete former material Material inferior quality, water-cement ratio preferably gets the small value.In a word, though composition concrete raw material quality, water-binder ratio take compared with Small value, it is easier to obtain desired trial strength, it is easier to meet life requirement；（3）Determine in material property and quality On the premise of, according to historical data and experience, the size of expected water-cement ratio is tentatively drafted, but do not exceeded during trial mix and draft in advance Water-cement ratio；（4）Determine the various material usages of a cubic meter of concrete by assuming that apparent density method is calculated：（a）Assume C40~ C50 high performance concretes apparent density is 2450 ± 50 kg/m3, and fresh concrete actual measurement apparent density is with its error ± 2% Within when, can not be modified, otherwise, reply apparent density be modified;（b）Cement folk prescription consumption：It is actual strong according to cement Degree combines detection and construction experience is drafted, and C40 concrete mixs can use 220kg~270kg；C50 concrete mixs can use 260kg~330kg;（c）Flyash folk prescription consumption, according to match ratio use environment, position, flyash quality, user to coagulation The limitations affect factors such as the different requirements of each age strength of soil, the volume that flyash may be selected accounts for the 15%~35% of Binder Materials; （d）Ground granulated blast furnace slag powders folk prescription consumption, according to match ratio use environment, position, ground granulated blast furnace slag silty Amount, user may be selected mixing for ground granulated blast furnace slag powders to limitations affect factors such as the different requirements of each age strength of concrete Amount accounts for the 15%~35% of Binder Materials；（e）Mineral admixture total amount is preferably between the 30%~40% of binder total amount；（f）. （c）~（d）Mineral admixture can need to mix one or several according to construction, but be also not limited to both, through pass the test Also the mineral admixture of other kinds may be selected；（g）Sand coarse aggregate ratio determines.Level according to sand is matched somebody with somebody, and modulus of fineness, coarse aggregate are maximum Particle diameter, water-cement ratio, requirement of engineering, concrete transportation, the different choice sand coarse aggregate ratio of mode of movement, typically can use 35%~40%；（h）. According to the cement consumption and water-cement ratio drafted, folk prescription water consumption is calculated；（i）After each material usage determines more than, can calculate Slightly, fine aggregate consumption；（j）High efficiency water reducing agent is preferentially selected, representative kind is by the preferential order selected：Polycarboxylate system, Aminocarboxylate system, naphthalene system, sulfamate system, melamine system（Condensate of melamine sulfonate and formaldehyde）；（5）Mineral are blended Material：Preferentially select I grade of flyash（Common engineering, inessential engineering also can select II grade of flyash）, it is preferential from S95 grades of granulation The mineral admixtures such as blast furnace ground slag powder；（6）Each strength grade concrete selects three kinds of different cement consumption trial mix coagulations Soil, differs 20kg between every kind of different cement consumptions, control workability is constant, with last actual used water amount inverse water-cement ratio, behaviour When making by water-cement ratio control within expection, after fresh concrete workability and Slump Time losing of Large are satisfied by requiring, dress Three kinds of different mixture ratios of mold forming make a strength test, and test each age strength, and meeting trial strength with 28 days compression strength wants Ask, and cement and other Binder Materials sum cost the lowests are used as benchmark match ratio；（7）By folk prescription former material determined above Material consumption, expected water-cement ratio, different match ratios 25~35 liters of concrete of equal trial mix are used to check concrete mix workability And intensity.

4. a kind of one of claim 1-3 described C40~C50 high performance concretes coordinate and stirring means：It is characterized in that：Institute In the match ratio trial mix stage stated, its concrete ratio stirring technique is：（1）By load weighted coarse aggregate, fine aggregate sequentially Add in mixer, stir 15s, be subsequently adding 65% water, stir 20~30 s, add cement and admixture, stirring 40~ 60s, adds 25% water and high-performance water reducing agent, stirs 60~90s, concrete workability is observed while stirring, if concrete stream Dynamic property is small, then add remaining 10% water；If concrete flowability is still small, 0.2%~0.5% high-performance water reducing agent is continuously added, Continue to stir 60~90s, if concrete workability meets requiring, discharging carries out further work, finally appraises and decides actual used water Amount, appraises and decides water-cement ratio, and the water-cement ratio cannot be greater than the expected water-cement ratio drafted in advance；（2）Will if concrete workability is unsatisfactory for Ask, then need to consider the consistency problem of high-performance water reducing agent and cement first, secondly consider and other Binder Materials and high-performance Water reducer compatibility problem or the quality problems gathered materials（Surface characteristics and clean level etc.）；Conversely, the water consumption being computed is omited Have remaining and the workability of concrete fully meets construction needs, this is optimal result；（3）Stirring is detected after finishing and newly mixed The workability of concrete, meets and be put into after requiring static a period of time detection concrete slump gradual loss in lidded container, This index finally appraises and decides water-cement ratio after meeting requirement；（4）By the slump of the time interval determination of stirring, transport and Construction control After degree gradual loss satisfaction is required, the apparent density of concrete is determined, the density can with when assuming apparent density error less than 2% Each material usage of match ratio is not adjusted, conversely, the error need to correct adjustment each material usage of match ratio when being more than or equal to 2%, finally Appraise and decide the apparent density of the match ratio；（5）Packing compact forming concrete sample, is covered with plastic foil, is placed on 20 ± 2 DEG C, relatively Humidity is conserved to the demoulding in the environment more than 95%, and the test specimen of the demoulding is placed on into 20 ± 2 DEG C, moisture of the relative humidity more than 95% Maintenance tests each age strength to the age for needing in health-preserving chamber；（6）Other two kinds of match ratios of cement consumption are also pressed with top Method is tested, and after each age strength is all completed, three assemble 28 days age strengths of composition and division in a proportion is contrasted, and chooses workability Good, intensity is high, integrated cost reckling is used as benchmark match ratio.

5. C40~C50 high performance concretes according to claim 4 coordinate and stirring means, it is characterized in that：Used Equipment is Double-horizontal-shaft concrete forced stirrer, and is ensured during described match ratio trial mix, it is ensured that actual water-cement ratio is not more than Expected water-cement ratio.