CN111704404A - Shrinkage-compensating concrete and preparation method thereof - Google Patents
Shrinkage-compensating concrete and preparation method thereof Download PDFInfo
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- CN111704404A CN111704404A CN202010430591.1A CN202010430591A CN111704404A CN 111704404 A CN111704404 A CN 111704404A CN 202010430591 A CN202010430591 A CN 202010430591A CN 111704404 A CN111704404 A CN 111704404A
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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
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses shrinkage-compensating concrete which comprises the following raw material components in parts by weight: cement: 296-340 parts; medium sand: 708-768 parts of a mixture; crushing stone: 1025-1050 parts; fly ash: 30-45 parts of a solvent; additive: 9.6-11.6 parts; swelling agent: 36-68 parts; water: 150-160 parts; the water-to-glue ratio is 0.33-0.43; the preparation method comprises the following steps: s1, mixing and stirring the medium sand, the broken stone and water to obtain a premix; s2, mixing and stirring the cement, the fly ash, the expanding agent and the premix to obtain an intermediate mixture; s3, mixing and stirring the admixture and the intermediate mixture to obtain cement mortar; and S4, filling the cement mortar into a mould, and curing under specific conditions to obtain the high compensation shrinkage concrete. The slump loss of the high compensation shrinkage concrete obtained by the invention is reduced, and the compressive strength of the concrete is improved.
Description
Technical Field
The invention relates to the field of concrete, in particular to shrinkage-compensating concrete and a preparation method thereof.
Background
Concrete is used as a consumable material in the field of construction, and can be divided into common concrete, high-strength concrete, shrinkage-compensating concrete, recycled concrete and the like according to different standards. The shrinkage-compensating concrete is added with an expanding agent to block or change the pore structure of the concrete, so that the defects of shrinkage deformation and easy crack generation of the concrete are overcome, the anti-permeability and anti-cracking capacity is improved, and the shrinkage-compensating concrete is widely applied to underground waterproof engineering, underground buildings, water tanks, water towers, water plants, airports and other engineering.
Currently, for example, chinese patent application publication No. CN109824307A discloses a novel shrinkage-compensating concrete, which has the technical points that: the composition comprises the following components in parts by weight: 310-360 parts of a cementing material; 1800-1900 parts of mineral aggregate; 165-175 parts of water; 6.4-8 parts of a polycarboxylic acid water reducing agent; 8.6-13 parts of an expanding agent; 250-295 parts of phase change particles. The phase change particles can absorb heat when the cementing materials forming the concrete are hydrated and released, and then when the concrete is prepared under the hot environment, the temperature of a concrete system can be kept in a range enabling the polycarboxylic acid water reducing agent to be normally used, so that the content of available water of other components in the concrete is not influenced, and all performances of the concrete in the hot environment can be guaranteed to be kept.
When the expansive agent is added to prepare the shrinkage-compensating concrete, the conditions of raw materials, the doping amount of the fly ash, the quality of the expansive agent and the like need to be strictly controlled according to the principle that the design, the construction and the material are tightly combined. The water doping requirement of the compensation shrinkage type concrete is usually higher than that of the common concrete, and the water-cement ratio of the compensation shrinkage type concrete is higher, so that the hydration reaction of the concrete is violent during mixing, and the slump loss of the concrete is large.
Disclosure of Invention
In view of the disadvantages of the prior art, a first object of the present invention is to provide a shrinkage-compensating concrete having the advantage of reducing the slump loss of the concrete.
A second object of the present invention is to provide a method for producing shrinkage-compensating concrete, which can produce shrinkage-compensating concrete with less slump loss.
In order to achieve the first object, the invention provides the following technical scheme:
the shrinkage-compensating concrete comprises the following raw material components in parts by weight:
cement: 296-340 parts;
medium sand: 708-768 parts of a mixture;
crushing stone: 1025-1050 parts;
fly ash: 30-45 parts of a solvent;
additive: 9.6-11.6 parts;
swelling agent: 36-68 parts;
water: 150-160 parts;
wherein the water-to-glue ratio is 0.33-0.43.
By adopting the technical scheme, the water-cement ratio is calculated in the mode of water/(cement + fly ash + expanding agent), when the concrete is prepared, the numerical value of the water-cement ratio is reasonably reduced by adjusting and controlling the proportioning content of each component of the concrete, the compressive strength and the fluidity of the concrete are easily reduced by excessive fly ash, the temperature rise generated during the hydration reaction of the concrete can be reduced by proper amount of fly ash, the efficiency reduction of an additive due to the temperature change is avoided, the water consumption during the mixing of the concrete is reduced to the maximum extent, the severe hydration reaction of the concrete is avoided, the slump loss of the concrete is reduced, and the compressive strength is improved at the same time.
Further, the additive is formed by mixing a polycarboxylic acid water reducing agent, an aminosulfonate water reducing agent and a melamine resin water reducing agent according to the ratio of 7:5: 2.
By adopting the technical scheme, the three water reducing agents are compounded in proportion, so that the water reducing rate can be improved, the water requirement during the mixing of the cement is further reduced, the phenomenon that the hydration is violent due to excessive water during the mixing of the cement is avoided, and the slump loss of the concrete is reduced.
Further, the admixture dosage is 2.6%.
By adopting the technical scheme, the admixture is an admixture/(cement + fly ash + expanding agent), the admixture is a water reducing agent, the water reducing agent has a dispersing effect on cement particles, so that the coated water participates in flowing, the mixing amount of the water reducing agent is strictly controlled to be 2.6%, the water consumption during mixing of concrete can be reduced to the maximum extent, the flowability of concrete mixtures is improved, and the compressive strength of the concrete is improved.
Further, the mixing amount of the fly ash is 7.4-10.8%.
By adopting the technical scheme, the coal ash mixing amount is calculated in a manner of coal ash mixing amount/(cement + coal ash + expanding agent), the coal ash plays a physical dispersing role on cement particles, the hydration speed of concrete can be reduced, the phenomenon that the concrete hydration reaction is violent to cause larger temperature rise is avoided, the phenomenon that the water reducing agent is influenced by temperature to reduce the water reducing rate is avoided, and the coal ash is matched with other components by controlling the mixing amount of the coal ash, so that the compressive property of the concrete is integrally improved.
Further, the mixing amount of the expanding agent is 10-15%.
By adopting the technical scheme, the calculation mode of the mixing amount of the expanding agent is the mixing amount of the expanding agent/(cement + fly ash + expanding agent), a large amount of expansive crystalline hydrate is generated in concrete by mixing the expanding agent, the generated expansion is converted into compressive stress under the constraint of an external structure, and the shrinkage tensile stress generated in the hardening process of the concrete can be offset, so that the cracking resistance and the impermeability can be improved, the mixing amount of the expanding agent is strictly controlled, the cracking caused by overlarge internal stress generated in the concrete can be avoided, and the compressive strength of the concrete can be integrally improved.
Further, the expanding agent is a SYG high-performance expansion crack-resistant agent.
By adopting the technical scheme, the expanding agent is mixed in the concrete to generate a large amount of expansive crystalline hydrate, so that the shrinkage compensation effect can be provided for the early stage, the middle stage and the later stage of the concrete, and meanwhile, a proper amount of cellulose component is added, so that capillary pores in the concrete can be filled, the bonding force of internal molecules is improved, and the impermeability and the waterproof performance are improved.
Furthermore, the raw material also comprises 1-2 parts by weight of rosin soap.
By adopting the technical scheme, the rosin soap and the additive have good synergistic effect, a small amount of closed bubbles are introduced into the concrete, the bubbles can be used as a lubricant, the friction force between particles is reduced, the fluidity is improved, the water reducing rate of the water reducing agent is improved, and the slump loss of the concrete is reduced.
Further, the water content of the fly ash is 0.4%, and the fineness of the fly ash is 15.2%.
By adopting the technical scheme, the fineness of the fly ash is controlled to be 15.2%, the smaller the fineness is, the bonding strength of a mortar interface is improved, and meanwhile, the less water is needed when concrete is mixed; by reducing the water content of the fly ash, caking of the fly ash can be avoided.
Further, the feed comprises the following raw material components in parts by weight:
cement: 340 parts of (A);
medium sand: 710 parts;
crushing stone: 1040 parts of (1);
fly ash: 45 parts of (1);
additive: 11.6 parts;
swelling agent: 68 parts of (b);
water: 150 parts;
at this time, the water-to-gel ratio was 0.33.
By adopting the technical scheme, the concrete contents of the concrete components are cooperated with each other, so that the water consumption of the concrete during mixing can be reduced to the maximum extent, and the compressive strength of the concrete is improved; meanwhile, the reasonable anti-permeability and anti-cracking performance of the concrete is ensured.
In order to achieve the second object, the invention provides the following technical scheme:
a preparation method of concrete with high compensation shrinkage comprises the following steps:
s1, adding the medium sand, the broken stone and water into a stirrer according to the proportion, and stirring for 2 minutes at 45 revolutions per minute to obtain a premix;
s2, adding the cement, the fly ash and the expanding agent into a stirrer according to the proportion, mixing the mixture with the premix, and stirring for 2 minutes at 45 revolutions per minute to obtain an intermediate mixture;
s3, adding the admixture into a stirrer according to the proportion, mixing the admixture with the intermediate mixture, and stirring for 5 minutes at the speed of 45 revolutions per minute to obtain cement mortar;
and S4, filling the cement mortar into a mold, pouring, molding and vibrating, placing the cement mortar in water at 23 ℃ for curing for 7 days, and then transferring the cement mortar into air at 23 ℃ and 95% of humidity for curing for 21 days to obtain the high compensation shrinkage concrete.
By adopting the technical scheme, the washed sand, the broken stone and the water are mixed into the premix, then the cement, the fly ash and the premix are mixed, and the mixture is divided into groups for mixing, so that the mixing effect of each component of the concrete can be improved, the mixing fluidity is improved, and the concrete is prevented from being subjected to a quick setting phenomenon; the curing in water can give full play to the efficacy of the expanding agent, and then the curing is carried out in air, so that the concrete can be prevented from cracking, and the anti-permeability and anti-cracking performance can be improved.
In conclusion, the invention has the following beneficial effects:
the water-cement ratio is calculated in a mode of water/(cement + fly ash + expanding agent), when concrete is prepared, the numerical value of the water-cement ratio is reasonably reduced by adjusting and controlling the proportioning content of each component of the concrete, the compressive strength and the fluidity of the concrete are easily reduced by excessive fly ash, the temperature rise generated during the hydration reaction of the concrete can be reduced by proper amount of fly ash, the efficiency reduction of an additive due to the temperature change is avoided, the water consumption during the mixing of the concrete is reduced to the maximum extent, the severe hydration reaction of the concrete is avoided, the slump loss of the concrete is reduced, and the compressive strength is improved;
secondly, the water reducing agent has a dispersing effect on cement particles, so that the coated water participates in flowing, the mixing amount of the water reducing agent is strictly controlled to be 2.6%, the water consumption during mixing of concrete can be reduced to the maximum extent, the fluidity of concrete mixtures is improved, and the slump loss of the concrete is reduced;
thirdly, the fly ash plays a role in physically dispersing cement particles, so that the hydration speed of concrete can be reduced, the phenomenon that the concrete undergoes a severe hydration reaction to cause a large temperature rise is avoided, the water reducing agent is prevented from being influenced by temperature to reduce the water reducing rate, and the loss of concrete slump is reduced by controlling the mixing amount of the fly ash to enable the fly ash to be matched with other components;
fourthly, the expansive agent is mixed in the concrete to generate a large amount of expansive crystalline hydrate, the generated expansion is converted into compressive stress under the constraint of an external structure, and the shrinkage tensile stress generated in the hardening process of the concrete can be offset, so that the cracking resistance and the impermeability are improved, the mixing amount of the expansive agent is strictly controlled, the cracking caused by the excessive internal stress generated in the concrete can be avoided, and the compressive strength of the concrete is integrally improved.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the following examples and comparative examples:
the polycarboxylate water reducer is a polycarboxylate water reducer with model number LM-S2, which is produced by Luomei building materials science and technology Limited company of Dongguan city;
the sulfamate water reducer is produced by a constant high polymer material company Limited in Jining;
the melamine resin water reducing agent is a YFN-101 melamine resin water reducing agent produced by Jafeng building materials Co.Ltd, Sichuan province;
the rosin soap is manufactured by Shanghai Hopkinson Fine chemical industry Co., Ltd and is of a GALAPON brand;
the SYG high-performance expansion crack-resistant agent is produced by Tianjin leopard Ming company and has the product number of 191011;
the cement was ordinary portland cement having a strength grade of 42.5 produced by intel sea snail cement limited, and the test results are shown in table 1:
TABLE 1 Cement Performance test results
The fly ash is produced by Guangdong Huizhou open sea power plant company, and the test results are shown in Table 2:
TABLE 2 fly ash Performance test results
The macadam is produced by Huizhou, and the test results are shown in Table 3:
TABLE 3 crushed stone Performance test results
The medium sand was river sand produced by Dongguan, and the test results are shown in Table 4:
table 4 Sand Performance test results
Examples
The weight ratio of the raw materials in each example is shown in the following table 5:
table 5 shows the weight ratios of the raw materials of examples 1 to 6
In the above examples 1 to 6, the admixture was a polycarboxylic acid water reducing agent, and the expanding agent was a SYG high-performance expansion crack-resistant agent.
Example 7
The difference from the example 5 is that the admixture is 10.88kg/m3At this time, the admixture was added in an amount of 2.4.
Example 8
The difference from the example 5 is that the content of the admixture is 9.96kg/m3At this time, the admixture was incorporated in an amount of 2.2.
Example 9
The difference from example 5 is that the fly ash content is 31.66kg/m3At this time, the blending amount of the fly ash is 7.2%.
Example 10
The difference from the embodiment 5 is that the additive is a sulfamate water reducer.
Example 11
The difference from the embodiment 5 is that the admixture is a melamine resin water reducing agent.
Example 12
The difference from the embodiment 5 is that the admixture is formed by mixing a polycarboxylic acid water reducing agent, a sulfamate water reducing agent and a melamine resin water reducing agent according to the ratio of 3:5: 3.
Example 13
The difference from the embodiment 5 is that the admixture is formed by mixing a polycarboxylic acid water reducing agent, a sulfamate water reducing agent and a melamine resin water reducing agent according to the ratio of 7:5: 2.
Example 14
The difference from the embodiment 5 is that the admixture is formed by mixing a polycarboxylic acid water reducing agent, a sulfamate water reducing agent and a melamine resin water reducing agent according to the ratio of 2:4: 1.
Example 15
The difference from the embodiment 5 is that the admixture is prepared by mixing a polycarboxylic acid water reducing agent, a sulfamate water reducing agent and a melamine resin water reducing agent according to the ratio of 3:1: 4.
Example 16
The difference from example 5 is that the starting material also contained a weight of 1kg/m3The rosin soap of (1).
Example 17
The difference from example 5 is that the starting material also contained a weight of 1.5kg/m3The rosin soap of (1).
Example 18
The difference from example 5 is that the starting material also contained a weight of 2kg/m3The rosin soap of (1).
The above examples 1-18 were prepared as follows:
s1, adding the medium sand, the broken stone and water into a stirrer according to the proportion, and stirring for 2 minutes at 45 revolutions per minute to obtain a premix;
s2, adding the cement, the fly ash and the expanding agent into a stirrer according to the proportion, mixing the mixture with the premix, and stirring for 2 minutes at 45 revolutions per minute to obtain an intermediate mixture;
s3, mixing the admixture according to the weight ratio of 7: 3, adding the 7-component and 3-component additives into a stirrer in batches in sequence to be mixed with the intermediate mixture, and stirring for 5 minutes at 45 revolutions per minute to obtain cement mortar;
and S4, filling the cement mortar into a mold, pouring, molding and vibrating, placing the cement mortar in water at 23 ℃ for curing for 7 days, and then transferring the cement mortar into air at 23 ℃ and 95% of humidity for curing for 21 days to obtain the high compensation shrinkage concrete.
Comparative example
Comparative example 1
The difference from the example 5 is that the content of the admixture is 12.68kg/m3At this time, the amount of the admixture added was 2.8.
Comparative example 2
The difference from example 5 is that the fly ash content is 52.5kg/m3At this time, the blending amount of the fly ash is 11.4%.
Comparative example 3
The difference from example 5 is that the fly ash content is 56.16kg/m3At this time, the blending amount of the fly ash is 12.1%.
Comparative example 4
The difference from example 5 is that the content of the expanding agent is 33.48kg/m3In this case, the amount of the swelling agent is 8%.
Comparative example 5
The difference from example 5 is that the content of the expanding agent is 84.5kg/m3In this case, the amount of the swelling agent is 18%.
Comparative example 6
The difference from example 5 is that the content of the expanding agent is 96.24kg/m3At this time, the amount of the swelling agent added was 20%.
Comparative example 7
The concrete is prepared by a novel mode disclosed by the invention application CN109824307A in the background technology.
Performance test
Making a standard block according to GB/T50081-2016 standard of mechanical property test method for common concrete, and testing the compressive strength of standard brick blocks of a plurality of examples and comparative examples cured for 28 d;
manufacturing a standard block according to GB/T50081-2016 standard of common concrete mechanical property test methods, testing a plurality of examples and comparative examples, and calculating the splitting tensile strength of the concrete after pouring for 28 d;
manufacturing a standard block according to GBJ82-85 'test method for long-term performance and durability of ordinary concrete', and testing the anti-permeability grade of standard brick block curing 28d of a plurality of examples and comparative examples;
slump flow tests were carried out according to JGJ 55-2011 "design rules for general concrete mix" on various examples and comparative examples.
Table 6 summarizes the test data for examples 1-18 and comparative examples 1-7
As can be seen from the analysis of the test data in examples 1 to 6 in Table 6, the content of the water-cement ratio is one of the key control factors of the concrete slump, and when the value of the water-cement ratio is larger, the slump loss is larger and the compressive strength of the concrete is reduced due to the fact that the concrete hydration reaction is violent; by properly reducing the numerical value of the water-cement ratio, the slump loss of the concrete can be reduced, the compressive strength of the concrete is improved, and the overall performance of the concrete is improved.
By analyzing the test data in examples 5, 7 and 8 and comparative example 1 in the table 6, it can be known that the addition of a proper amount of polycarboxylic acid water reducing agent into concrete can reduce the mixing water consumption of the concrete, thereby reducing the water-cement ratio and reducing the slump loss; meanwhile, with the increase of the mixing amount of the polycarboxylic acid water reducing agent, the concrete is too slow to be condensed and the air content is too high, so that the compressive strength of the concrete is reduced and the slump loss is large.
By analyzing the test data in examples 5 and 9 and comparative examples 2 and 3 in table 6, it can be known that the temperature rise caused by the hydration heat of the concrete can be reduced in the early stage by the addition of the fly ash, and the efficiency of the water reducing agent can be ensured and the strength and the fluidity of the concrete can be improved by using the fly ash because the polycarboxylic acid water reducing agent is sensitive to the temperature. When the addition amount of the fly ash is excessively increased, the water consumption requirement of the concrete is correspondingly increased, the water-cement ratio is changed, and the slump loss of the concrete is increased.
As can be seen from the analysis of the test data in example 5 and comparative examples 4 to 6 in Table 6, the expansive agent can improve the impermeability and crack resistance of the concrete, when the addition amount of the expansive agent is too small, the expansive effect cannot be sufficiently achieved, the crack resistance strength and impermeability of the concrete are low, and the concrete is easy to crack; when the mixing amount of the expanding agent is too much, internal stress is generated inside the concrete due to transitional expansion, and the compressive strength of the concrete is obviously reduced.
It can be seen from the analysis of the test data in examples 5 and 10 to 15 in table 6 that the water reducing rate of the concrete is improved and the slump loss of the concrete can be remarkably reduced by adding the admixture formed by mixing the polycarboxylic acid water reducing agent, the sulfamate water reducing agent and the melamine resin water reducing agent according to different proportions.
As can be seen from the analysis of the test data in examples 5 and 16-18 in Table 6, the rosin soap and the admixture have good synergistic effect, trace closed bubbles are introduced into the concrete, and the bubbles can be used as a lubricant, so that the friction force between particles is reduced, the fluidity is improved, the water reducing rate of the water reducing agent is improved, and the slump loss of the concrete is reduced.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The shrinkage-compensating concrete is characterized by comprising the following raw material components in parts by weight:
cement: 296-340 parts;
medium sand: 708-768 parts of a mixture;
crushing stone: 1025-1050 parts;
fly ash: 30-45 parts of a solvent;
additive: 9.6-11.6 parts;
swelling agent: 36-68 parts;
water: 150-160 parts;
wherein the water-to-glue ratio is 0.33-0.43.
2. The shrinkage-compensating concrete according to claim 1, wherein the admixture is a polycarboxylic acid water reducing agent, a sulfamate water reducing agent and a melamine resin water reducing agent which are mixed in a ratio of 7:5: 2.
3. The shrinkage-compensating concrete according to claim 2, wherein the admixture is added in an amount of 2.6%.
4. The shrinkage-compensating concrete according to claim 1, wherein the blending amount of the fly ash is 7.4-10.8%.
5. The shrinkage-compensating concrete according to claim 1, wherein the amount of the expansive agent is 10-15%.
6. The shrinkage-compensating concrete according to claim 1, wherein the expanding agent is a SYG high-performance expansion crack-resistant agent.
7. The shrinkage-compensating concrete according to claim 1, wherein the raw materials further comprise 1-2 parts by weight of rosin soap.
8. The shrinkage-compensating concrete according to claim 1, wherein the fly ash has a water content of 0.4% and a fineness of 15.2%.
9. The shrinkage-compensating concrete according to claim 1, which comprises the following raw material components in parts by weight:
cement: 340 parts of (A);
medium sand: 710 parts;
crushing stone: 1040 parts of (1);
fly ash: 45 parts of (1);
additive: 11.6 parts;
swelling agent: 68 parts of (b);
water: 150 parts;
at this time, the water-to-gel ratio was 0.33.
10. A method of producing shrinkage-compensating concrete as claimed in any one of claims 1 to 9, characterised by the steps of:
s1, adding the medium sand, the broken stone and water into a stirrer according to the proportion, and stirring for 2 minutes at 45 revolutions per minute to obtain a premix;
s2, adding the cement, the fly ash and the expanding agent into a stirrer according to the proportion, mixing the mixture with the premix, and stirring for 2 minutes at 45 revolutions per minute to obtain an intermediate mixture;
s3, adding the admixture into a stirrer according to the proportion, mixing the admixture with the intermediate mixture, and stirring for 5 minutes at the speed of 45 revolutions per minute to obtain cement mortar;
and S4, filling the cement mortar into a mold, pouring, molding and vibrating, placing the cement mortar in water at 23 ℃ for curing for 7 days, and then transferring the cement mortar into air at 23 ℃ and 95% of humidity for curing for 21 days to obtain the high compensation shrinkage concrete.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112299792A (en) * | 2020-11-20 | 2021-02-02 | 三门县远景建筑材料有限公司 | Process for preparing concrete |
| CN112707698A (en) * | 2020-12-24 | 2021-04-27 | 中国十九冶集团有限公司 | C30 super-thick floor concrete and preparation method thereof |
| CN113620671A (en) * | 2021-09-08 | 2021-11-09 | 中国水利水电第十二工程局有限公司 | Preparation method of shrinkage-compensating concrete and shrinkage-compensating concrete |
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