CN114105530A - Concrete mix proportion design method based on minimum slurry theory - Google Patents
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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
- 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
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- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
- G16C60/00—Computational materials science, i.e. ICT specially adapted for investigating the physical or chemical properties of materials or phenomena associated with their design, synthesis, processing, characterisation or utilisation
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to a concrete mix proportion design method based on a minimum slurry theory, which comprises the following steps of S1 selecting slurry and aggregate, and controlling the difference of apparent density between the slurry and the aggregate within a preset range; s2, determining the slurry volume and the volume sand rate of the fine aggregate required by the strength grade of the concrete according to the minimum slurry theory, and further determining the use amount and water consumption of the coarse aggregate, the fine aggregate, the cement and the admixture; s3, uniformly stirring and mixing the coarse aggregate, the fine aggregate, the cement, the admixture and the water according to the using amount of S2 to obtain the concrete. According to the invention, by adjusting the density of each component in the concrete raw material, adopting the dredged sand and the machine-made sand to form the fine aggregate, and then carrying out concrete mix proportion design based on the minimum slurry theory, the concrete volume stability is better and the cost is lower under the condition of ensuring that the slump, the 28d compressive strength and the chloride ion diffusion coefficient of the concrete meet the design requirements.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a concrete mix proportion design method based on a minimum slurry theory.
Background
The concrete is used as an important material of modern building materials, and is an artificial stone which is formed by taking cement as a main gel material, mixing the cement, aggregate, water, chemical additives (water reducing agent, expanding agent and the like) and mineral additives (admixture, slag powder and the like) as necessary, mixing the materials according to a proper proportion, uniformly pouring, stirring, compacting, curing and hardening. The traditional concrete mix design is designed by experienced civil engineers using their past experience, in the laboratory, several mixes must be tried to obtain the desired concrete strength and slump, and this time consuming process not only increases the material waste but also the cost of concrete production.
In order to improve the situation, a series of concrete mix proportion optimization design methods are provided. Ontao et al use an artificial neural network approach to reduce the number of trial runs by establishing the relationship between concrete mix proportion parameters and performance indicators. The theory of maximum compaction is adopted by the people of king cynanchi, king giri and the like to optimize the mix proportion of the concrete. The minimum slurry theory divides concrete into two parts: aggregate and slurry. The aggregate comprises coarse and fine aggregates, namely sand and stone; the slurry is a mixture of water, cement and various admixtures. The slurry consists of two parts: the slurry filled in the holes of the sand-stone mixture and the slurry wrapped on the surface of the sand-stone mixture. The main purpose of the minimum slurry theory is to obtain a concrete mix ratio that requires the least amount of slurry to meet the performance requirements of the concrete. Therefore, compared with the maximum compaction theory, the concrete mixing proportion is optimized by adopting the minimum slurry theory, so that the concrete slurry volume is less, the concrete volume stability is better, and the cost is lower.
At present, fine aggregate used for concrete in most areas of China is still natural sand, natural sand resources are distributed unevenly, the forming process is long, and the fine aggregate cannot be regenerated in a short time once used up. Therefore, the utilization of local rock resources or waste rocks discarded by engineering to produce artificial sand and relieve the shortage of natural sand resources becomes a necessary choice for the current engineering construction. However, the mixed type artificial sand has complex components, and the concrete prepared from the mixed type artificial sand has low slump, high water demand and poor working performance. Particularly, when C30-C50 concrete is prepared, the working performance of the concrete is poor particularly seriously due to the fact that the concrete size is less.
Therefore, the invention takes the concrete cost as the objective of mix proportion optimization, adopts the minimum slurry theory to optimize the mix proportion of the concrete under the condition of ensuring that the concrete slump, the 28d compressive strength and the chloride ion diffusion coefficient meet the design requirements, and has important value for the application of fine aggregate consisting of Changjiang river dredged ultrafine sand (hereinafter referred to as dredged sand) and machine-made sand in the concrete.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a concrete mix proportion design method based on a minimum slurry theory, which achieves the aim of improving the working performance of concrete while reducing the cost of concrete.
The above object of the present invention is achieved by the following technical solutions:
s1, selecting slurry and aggregate, and controlling the difference of apparent densities between the slurry and the aggregate within a preset range, wherein the slurry comprises cement, admixture and water, the aggregate comprises coarse aggregate and fine aggregate, and the fine aggregate comprises machine-made sand and dredged sand accounting for 0-50.00% of the total weight of the fine aggregate; s2, determining the slurry volume and the volume sand rate of the fine aggregate required by the strength grade of the concrete according to the minimum slurry theory, and further determining the use amount and water consumption of the coarse aggregate, the fine aggregate, the cement and the admixture; s3, uniformly stirring and mixing the coarse aggregate, the fine aggregate, the cement, the admixture and the water according to the using amount of S2 to obtain the concrete.
By adopting the technical scheme, when concrete raw materials are selected, the apparent density difference among the components can reach the minimum range by adjusting the apparent densities of the slurry and the components in the aggregate, so that the inhomogeneity of the distribution of the components in the concrete can be reduced, and the initial improvement of the stacking compactness of the aggregate is facilitated; then, the fine aggregate is composed of the machine-made sand and the dredged sand accounting for 0-50.00% of the total weight of the fine aggregate, and as the machine-made sand is hard in texture and fresh in interface and has rough and multi-angular surface, weak chemical reaction can occur on the surface in a high-concentration calcium hydroxide environment formed by the dredged sand and slurry, so that the concrete strength is enhanced; meanwhile, through the filling effect, the activity effect and the core effect of the dredged sand, the lubricating effect can be achieved among the machine-made sands, the defect that the consumption of the medium-low strength concrete is small is compensated, and the working performance and the compressive strength of the concrete can be further coordinated; finally, the dosage of the slurry is reduced through the minimum slurry theory, so that the volume stability of the concrete is better, and the cost is lower; in conclusion, by adjusting the density of each component in the concrete raw material and adopting the dredged sand and the machine-made sand to form the fine aggregate, the working performance and the compressive strength of the concrete can be effectively balanced, and then the mix proportion design of the concrete is carried out based on the minimum slurry theory, so that the volume stability of the concrete can be better and the cost can be lower under the condition that the slump, the 28d compressive strength and the chloride ion diffusion coefficient of the concrete meet the design requirements.
Further, in S1, performing topicaldensity of cement is 3145kg/m, performing topicaldensity of admixture at 2150kg/m, performing thin-aggregate cultivation at 2638.40kg/m, and performing thin-aggregate cultivation at 2627-2590 kg/m.
Preferably, the step S2 includes a process of establishing a slurry volume calculation formula by combining the apparent density and the average slurry thickness of the wrapped aggregate; determining the minimum slurry volume and the corresponding fine aggregate volume sand rate by combining the slurry volume calculation formula and the minimum slurry theory; determining the aggregate usage amount calculation process of the usage amounts of the fine aggregate and the coarse aggregate by combining the apparent density, the minimum slurry volume and the corresponding fine aggregate volume sand rate; and determining the dosage of cement, admixture and water by combining the minimum slurry volume, powder-to-cement ratio and water-to-cement ratio; wherein the powder-to-gel ratio is the percentage of the admixture in the total weight of the slurry, and the water-to-gel ratio is the percentage of the water in the total weight of the slurry.
Specifically, the average slurry thickness of the coated aggregate is 20 μm. Under the state, even if the replacement rate of the dredged sand reaches 50 percent, namely the dredged sand accounts for 50 percent of the total weight of the aggregate, and the concrete reaches the preset compressive strength of C30-C50, the slump constant of the concrete can still reach 120-180 mm.
Specifically, the minimum slurry volume is 0.46-0.64 m, and the volume sand rate of the fine aggregate corresponding to the minimum slurry volume is 0.31-0.19. When the replacement rate of the dredged sand is 0%, 12.50%, 25.00%, 37.50% and 50.00% in sequence, carrying out thin aggregate volume sand ratio according to the minimum slurry volume by carrying out thin aggregate volume sand cultivation according to the sequence of 0.46m, 0.49m, 0.55m, 0.58m and 0.64 m.
Specifically, the using amount of the fine aggregate is 299.82-557.55 kg, and the using amount of the coarse aggregate is 1229.08-1285.33 kg. Wherein when the dredging sand substitution rate is 0%, 12.50%, 25.00%, 37.50% and 50.00% in sequence, the dosage of the fine aggregate is 557.55kg, 553.14kg, 443.90kg, 404.55kg and 299.82kg in sequence, and the dosage of the coarse aggregate is 1229.08kg, 1169.27kg, 1206.71kg, 1250.73kg and 1285.33kg in sequence.
Specifically, when the strength grade of the concrete is C30-C50, the water-cement ratio is 0.28-0.43. Wherein, when the strength grade of the concrete is C30, the water-cement ratio is 0.43; when the strength grade of the concrete is C40, the water-cement ratio is 0.34; when the strength grade of the concrete is C50, the water-cement ratio is 0.28.
Specifically, the powder-to-gel ratio was 335.00.
Further, the concrete also comprises a water reducing agent, wherein the water reducing agent accounts for 1.50% of the total weight of the cement, and the solid content of the water reducing agent is 18%.
Further, the saturated surface dry water absorption of the coarse aggregate is 0.20%, and the saturated surface dry water absorption of the fine aggregate is 0.20-0.48%. When the replacement ratio of the dredged sand is 0%, 12.50%, 25.00%, 37.50% and 50.00%, the saturated surface dry water absorption of the fine aggregate is 0.20%, 0.27%, 0.34%, 0.41% and 0.48% respectively.
In conclusion, the beneficial technical effects of the invention are as follows: by adjusting the density of each component in the concrete raw material and adopting the dredged sand and the machine-made sand to form the fine aggregate, the working performance and the compressive strength of the concrete can be effectively balanced, and then the mix proportion design of the concrete is carried out based on the minimum slurry theory, so that the volume stability of the concrete can be better and the cost can be lower under the condition that the slump, the 28d compressive strength and the chloride ion diffusion coefficient of the concrete meet the design requirements.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the functions of the invention clearer and easier to understand, the invention is further described in the following with the specific embodiments.
Example 1: the invention discloses a concrete mix proportion design method based on minimum slurry theory, which comprises the following steps,
s1, selecting slurry and aggregate, and controlling the difference value of the apparent densities of the slurry and the aggregate within a preset range, wherein the slurry comprises cement, admixture and water, the aggregate comprises coarse aggregate and fine aggregate, and the fine aggregate comprises machine-made sand and dredged sand accounting for 0-50.00% of the total weight of the fine aggregate;
s2, determining the volume of slurry and the volume sand rate of fine aggregate required by the strength grade of concrete according to the minimum slurry theory, and further determining the use amount and water consumption of coarse aggregate, fine aggregate, cement and admixture;
s3, stirring and mixing the coarse aggregate, the fine aggregate, the cement, the admixture and the water uniformly according to the dosage of S2 to obtain the concrete.
Example 2:the concrete mix proportion design method based on the minimum slurry theory disclosed by the invention is different from the concrete mix proportion design method in the embodiment 1 in that S1 selects slurry and aggregate, and the density difference between the slurry and the aggregate is controlled within a preset range, wherein the slurry comprises cement, admixture composed of fly ash and water, and the aggregate comprises coarse aggregate composed of 2.36-19.00 mm of broken stones and fine aggregate composed of dredging sand and machine-made sand; meanwhile, setting the replacement rate of the dredged sand (namely the weight percentage of the dredged sand in the fine aggregate) to be 0-50.00%, and measuring according to the methods of GB/T208-94 and GB/T14685-2001 to obtain the apparent densities rho of the cement, the admixture, the water, the fine aggregate and the coarse aggregateC、ρF、ρW、ρS、ρGApparent density is shown in table 1;
TABLE 1
| Numbering | Replacement rate of dredged sand | ρC（kg/m³） | ρF（kg/m³） | ρW（kg/m³） | ρG（kg/m³） | ρS（kg/m³） |
| 1 | 0% | 3145 | 2150 | 996.03 | 2638.40 | 2627 |
| 2 | 12.50% | 3145 | 2150 | 996.03 | 2638.40 | 2500 |
| 3 | 25.00% | 3145 | 2150 | 996.03 | 2638.40 | 2459 |
| 4 | 37.50% | 3145 | 2150 | 996.03 | 2638.40 | 2673 |
| 5 | 50.00% | 3145 | 2150 | 996.03 | 2638.40 | 2590 |
Example 3: the concrete mix proportion design method based on the minimum slurry theory is different from the concrete mix proportion design method in the embodiment 1 in that S2 determines the slurry volume required by the concrete capable of reaching the strength grade of C30-C50 and the volume sand rate of the fine aggregate corresponding to the slurry volume according to the minimum slurry theory, and further determines the use amount and water consumption of the coarse aggregate, the fine aggregate, the cement and the admixture, and the concrete implementation mode is as follows.
S21 determining slurry volume calculation formula
1）VP=mC/ρC+mF/ρF+mW/ρW；
2）VP=APT*S+VV；
Wherein S = mS*RS+mG*RG=yS*ρS*RS+（1-yS）*ρG*RG；
VV=（1-φA）/φA；
In the formula, VPIs the volume of the slurry; APT is the average slurry thickness of the wrapped aggregate; s is the total surface area of fine aggregate and coarse aggregate in each cubic meter of concrete; vVThe pore volume of fine aggregate and coarse aggregate in each cubic meter of concrete; phi is aAThe aggregate is mixed with compactness, wherein the stacking compactness of the fine aggregate is 0.53-0.56, the stacking compactness of the coarse aggregate is 0.55-0.57, and the calculation is carried out according to a Toufar aggregate model; m isC、mF、mW、mS、mGThe dosage of cement, admixture, water, fine aggregate and coarse aggregate in each cubic meter of concrete; rS、RGThe specific surface area of the fine aggregate and the coarse aggregate is determined by referring to GB/T8074-2008; y isSThe volume sand rate of the fine aggregate.
S22 determining the minimum slurry volume VPminAnd the volume sand rate y of the fine aggregate corresponding to the volume sand rateSop
Set APT =20 μm, at VPIs ordinate, ySEstablishing a coordinate system for the abscissa, thereby determining VPminAnd ySopThe results are shown in Table 2.
S23 determining the volume V of the slurrypAnd aggregate volume VSG
Carrying out the concrete up from 1m by the corresponding minimum slurry volume VPminThe volume V of the slurry can be obtainedpAnd aggregate volume VSGThe calculation results are shown in table 2;
1）VP=VPmin*（1-0.01θ）/（1+VPmin）；
2）VSG=（1-0.01θ）/（1+VPmin) (ii) a In the formula, theta is the percentage of the gas content of the concrete, and theta =1.
TABLE 2
| Numbering | Replacement rate of dredged sand | VPmin（m³） | ySop | VP（m³） | VSG（m³） |
| 1 | 0% | 0.46 | 0.31 | 0.31 | 0.68 |
| 2 | 12.50% | 0.49 | 0.33 | 0.33 | 0.66 |
| 3 | 25.00% | 0.55 | 0.28 | 0.35 | 0.64 |
| 4 | 37.50% | 0.58 | 0.24 | 0.36 | 0.63 |
| 5 | 50.00% | 0.64 | 0.19 | 0.39 | 0.60 |
S24 determining the amount m of fine aggregateSThe amount of coarse aggregate mGThe amount of the dredged sand is mG1Machine-made sand dosage mG2
From the volume V of the aggregateSGVolume sand ratio of fine aggregate ySopAnd apparent density ρSThe amount of fine aggregate mS and the amount of coarse aggregate m can be obtainedG(ii) a Then, the usage m of the dredged sand can be obtained according to the dredged sand substitution rateG1Machine-made sand dosage mG2The calculation results are shown in table 3;
1）mS=ySop*ρS*VSG；
2）mG=（1-ySop）*ρS*VSG。
TABLE 3
| Numbering | Replacement rate of dredged sand | mS（kg） | mG（kg） | mG1（kg） | mG2（kg） |
| 1 | 0% | 557.55 | 1229.08 | 0.00 | 557.55 |
| 2 | 12.50% | 553.14 | 1169.27 | 12.50 | 484.00 |
| 3 | 25.00% | 443.90 | 1206.71 | 25.00 | 332.93 |
| 4 | 37.50% | 404.55 | 1250.73 | 37.50 | 252.84 |
| 5 | 50.00% | 299.82 | 1285.33 | 50.00 | 149.91 |
S25 determining the cement dosage mCThe amount of the admixture mFWater consumption mW
Determining the powder-to-gel ratio beta according to the concrete strength gradeFWater to gel ratio betaWCombined with the apparent density ρ of the cementCApparent density of admixture rhoFApparent density of water ρWThe cement dosage m can be obtainedCThe amount of the admixture mFWater consumption mW(ii) a Wherein, the powder-to-gel ratio is the percentage of the admixture to the total weight of the slurry, and the water-to-gel ratio is the percentage of the water to the total weight of the slurry, and the calculation results are shown in table 4;
1）mC=（1-βF）*C；
2）mF=βF*C；
3）mW=βW*C；
wherein, C = mC+mF=-ρC*ρF*ρW*VP/（βF*ρF*ρW-ρF*ρW-βF*ρC*ρW-βW*ρC*ρF）
S26 determining the using amount m of the water reducing agentR
According to the mixing amount beta of the water reducing agentRCombined cement dosage mCThe amount m of the water reducing agent can be obtainedR，mR=βR*mC，βR=1.50%, the calculation results are shown in table 4;
TABLE 4
Adjustment of S27 mix ratio
During actual construction, the dry water absorption W is determined according to the saturated surface of the fine aggregateSAnd actual water content ZSSaturated surface dry water absorption W of coarse aggregateGAnd actual water content ZGAnd the solid content Z of the water-reducing agentRFor actual water consumption mW' amount of fine aggregate mS' and amount of coarse aggregate mG' make an adjustment;
1）mW’=mW+mS*WS+mG*WG-mS*ZS-mG*ZG-mR*ZR；
2）mW’=mS*（1+ZS）；
3）mG’=mG*（1+ZG）；
in this embodiment, the sand and pebbles are controlled to be in a dry state, i.e., ZG、ZSThe results are shown in Table 5.
TABLE 5
Example 4: compared with the concrete mix proportion design method disclosed by the invention, the concrete mix proportion design method based on the minimum slurry theory is different from the concrete mix proportion design method disclosed by the embodiment 1 in that S3 is used for uniformly stirring and mixing the dredged sand, the machine-made sand, the fine aggregate, the cement, the admixture and the water according to the dosage of S2 and S3 to obtain the concrete.
S31, uniformly stirring and mixing the dredged sand, the machine-made sand, the fine aggregate, the cement, the admixture and the water according to the dosage of tables 4-5 to obtain a mixture, then carrying out slump expansion test according to JGJT283-2012, and verifying the compressive strength of the mixture, wherein the test result is shown in Table 6;
s32, adjusting the mixing amount of the slurry, the aggregate, the water and the water reducing agent according to the slump expansion degree and the compressive strength of the mixture so as to achieve the preset compressive strength of the concrete; specifically, firstly, slump expansion testing is carried out on the mixture, and the mixture meets the slump expansion requirement by adjusting the mixing amount of the water reducing agent; verifying whether the mixture meets the requirement of compressive strength under the condition of meeting the slump expansion degree; if not, adjusting the water cement ratio or the water-cement ratio to balance the slump expansion degree and the compressive strength of the mixture;
s33, mixing the slurry, the aggregate and the water according to the mixing amount of S32, adding the water reducing agent, stirring and mixing uniformly to obtain the concrete.
TABLE 6
As can be seen from Table 6, the above concrete has an ATP of 20 μm, and even when the substitution rate of the dredged sand is 50%, i.e., the dredged sand accounts for 50% of the total weight of the aggregate, the concrete still has a slump constant of 120-180 mm when reaching a predetermined compressive strength of C30-C50, and the actual compressive strength is higher than the predicted compressive strength. The reason is that when concrete raw materials are selected, the apparent density difference among the components can reach the minimum range by adjusting the apparent density of the slurry and the components in the aggregate, so that the unevenness of the distribution of the components in the concrete can be reduced, and the initial improvement of the stacking compactness of the aggregate is facilitated; then, the fine aggregate is composed of the machine-made sand and the dredged sand accounting for 0-50.00% of the total weight of the fine aggregate, and as the machine-made sand is hard in texture and fresh in interface and has rough and multi-angular surface, weak chemical reaction can occur on the surface in a high-concentration calcium hydroxide environment formed by the dredged sand and slurry, so that the concrete strength is enhanced; meanwhile, through the filling effect, the activity effect and the core effect of the dredged sand, the lubricating effect can be achieved among the machine-made sands, the defect that the consumption of the medium-low strength concrete is small is compensated, and the working performance and the compressive strength of the concrete can be further coordinated; finally, the dosage of the slurry is reduced through the minimum slurry theory, so that the concrete has better volume stability and lower cost. In conclusion, by adjusting the density of each component in the concrete raw material and adopting the dredged sand and the machine-made sand to form the fine aggregate, the working performance and the compressive strength of the concrete can be effectively balanced, and then the mix proportion design of the concrete is carried out based on the minimum slurry theory, so that the volume stability of the concrete can be better and the cost can be lower under the condition that the slump, the 28d compressive strength and the chloride ion diffusion coefficient of the concrete meet the design requirements.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. A concrete mix proportion design method based on a minimum slurry theory is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
s1, selecting slurry and aggregate, and controlling the difference value of apparent densities between the slurry and the aggregate within a preset range, wherein the slurry comprises cement, admixture and water, the aggregate comprises coarse aggregate and fine aggregate, and the fine aggregate comprises machine-made sand and dredged sand accounting for 0-50.00% of the total weight of the fine aggregate;
s2, determining the slurry volume and the volume sand rate of the fine aggregate required by the strength grade of the concrete according to the minimum slurry theory, and further determining the use amount and water consumption of the coarse aggregate, the fine aggregate, the cement and the admixture;
s3, uniformly stirring and mixing the coarse aggregate, the fine aggregate, the cement, the admixture and the water according to the using amount of S2 to obtain the concrete.
2. The concrete mix proportion design method based on the minimum slurry theory as claimed in claim 1, wherein: in S1, performing thin slab labor at 3145kg/m, performing thin slab labor at 2150kg/m, performing thin slab labor at 2638.40kg/m, and performing thin slab labor at 2627-2590 kg/m.
3. The concrete mix proportion design method based on the minimum slurry theory as claimed in claim 2, wherein: the S2 comprises a process of establishing a slurry volume calculation formula by combining the apparent density and the average slurry thickness of the wrapped aggregate;
determining the minimum slurry volume and the corresponding fine aggregate volume sand rate by combining the slurry volume calculation formula and the minimum slurry theory;
determining the aggregate usage amount calculation process of the usage amounts of the fine aggregate and the coarse aggregate by combining the apparent density, the minimum slurry volume and the corresponding fine aggregate volume sand rate;
and determining the dosage of cement, admixture and water by combining the minimum slurry volume, powder-to-cement ratio and water-to-cement ratio; wherein the powder-to-gel ratio is the percentage of the admixture in the total weight of the slurry, and the water-to-gel ratio is the percentage of the water in the total weight of the slurry.
4. The concrete mix proportion design method based on the minimum slurry theory as claimed in claim 3, wherein: the average slurry thickness of the coated aggregate was 20 μm.
5. The concrete mix proportion design method based on the minimum slurry theory as claimed in claim 3, wherein: and carrying out dry distillation on the dry powder and the dry powder, wherein the minimum slurry volume is 0.46-0.64 m, and the sand rate of the fine aggregate volume corresponding to the minimum slurry volume is 0.31-0.19.
6. The concrete mix proportion design method based on the minimum slurry theory as claimed in claim 3, wherein: the using amount of the fine aggregate is 299.82-557.55 kg, and the using amount of the coarse aggregate is 1229.08-1285.33 kg.
7. The concrete mix proportion design method based on the minimum slurry theory as claimed in claim 3, wherein: when the strength grade of the concrete is C30-C50, the water-cement ratio is 0.28-0.43.
8. The concrete mix proportion design method based on the minimum slurry theory as claimed in claim 3, wherein: the powder-to-gel ratio is 335.00.
9. The concrete mix proportion design method based on the minimum slurry theory according to any one of claims 1 to 3, characterized in that: the concrete further comprises a water reducing agent, wherein the water reducing agent accounts for 1.50% of the total weight of the cement, and the solid content of the water reducing agent is 18%.
10. The concrete mix proportion design method based on the minimum slurry theory according to any one of claims 1 to 3, characterized in that: the saturated surface dry water absorption of the coarse aggregate is 0.20%, and the saturated surface dry water absorption of the fine aggregate is 0.20-0.48%.
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|---|---|---|---|---|
| CN115340324A (en) * | 2022-08-22 | 2022-11-15 | 长江南京航道工程局 | Geopolymer concrete mix proportion design method based on dredged sand and artificial soft stone |
| CN115139390A (en) * | 2022-08-31 | 2022-10-04 | 中铁建设集团有限公司 | Material for floor support plate and preparation method thereof |
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| CN114105530B (en) | 2023-04-25 |
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