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Large-volume self-compacting concrete and preparation method thereof

A self-compacting concrete, large-volume technology, applied in the field of concrete engineering, can solve problems such as voiding, uncompacting concrete, cracking durability, etc., and achieve the effects of improving retardation performance, reducing shrinkage, improving durability and later strength

Active Publication Date: 2020-10-23
CHINA RAILWAY CONSTR ENG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the void caused by the lack of compactness of the concrete in the steel pipe concrete in the prior art, and the cracking and durability problems caused by the large volume of concrete due to the hydration and heat release

Method used

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  • Large-volume self-compacting concrete and preparation method thereof
  • Large-volume self-compacting concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A large-volume self-compacting concrete, unilateral (m 3 ) Concrete is composed of the following raw materials:

[0039] 580kg of gelling material, 1680kg of aggregate, 12.8kg of compound admixture, and 168kg of water;

[0040] Among them, the cementitious material includes 394kg Portland cement, 70kg ground slag powder (the specific surface area is not less than 800m 2 / kg), 58kg fly ash (Class F Class II), 58kg calcium sulfoaluminate-calcium oxide expansion agent;

[0041] The weight ratio of sand and gravel in the aggregate is 1:1.2, and the sand is sand in Zone II;

[0042] The composite admixture includes 1.2kg high acyl gellan gum, 11.6kg acrylic acid as the main chain and polyether grafted side chain polycarboxylate superplasticizer; wherein the polycarboxylate superplasticizer has a water reducing rate of 22wt%, The average relative molecular mass is 9000-12000, and the relative molecular mass of the grafted side chain is 1100-1300.

[0043] The preparation ...

Embodiment 2

[0048] A large-volume self-compacting concrete, unilateral (m 3 ) Concrete is composed of the following raw materials:

[0049] 600kg of cementitious material, 1660kg of aggregate, 12.0kg of compound admixture, and 172kg of water;

[0050] Among them, the cementitious materials include 388kg of Portland cement (strength grade 42.5), 26kg of finely ground slag powder (specific surface area not less than 800m 2 / kg), 150kg of fly ash (Class F Class II), 36kg of calcium sulfoaluminate-calcium oxide type expansion agent;

[0051] The weight ratio of sand and gravel in the aggregate is 1:1.3, and the sand is sand in Zone II;

[0052] Composite admixtures include 0.6kg high acyl gellan gum, 12.0kg methacrylic acid as the main chain and polyether grafted side chain polycarboxylate superplasticizer; the water reducing rate of polycarboxylate superplasticizer is 14wt %, the average relative molecular mass is 8000-10000, and the relative molecular mass of the grafted side chain is 10...

Embodiment 3

[0058] A large-volume self-compacting concrete, unilateral (m 3 ) Concrete is composed of the following raw materials:

[0059] 579kg of gelling material, 1730kg of aggregate, 10kg of compound admixture, and 166kg of water;

[0060] Among them, the cementitious materials include 335.8kg of ordinary Portland cement (strength grade 42.5), 104.2kg of finely ground slag powder (specific surface area not less than 800m 2 / kg), 92.7kg of fly ash (Class F Class II), 46.3kg of calcium sulfoaluminate-calcium oxide expansion agent;

[0061] The weight ratio of sand and gravel in the aggregate is 1:1.0, and the sand is sand in Zone II;

[0062] Composite admixtures include 0.9kg high acyl gellan gum, 9.1kg polycarboxylate superplasticizer with acrylic acid as the main chain and polyether grafted with side chains; the water reducing rate of polycarboxylate superplasticizer is 17wt%, The average relative molecular mass is 9000-11000, and the relative molecular mass of the grafted side c...

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Abstract

The invention discloses large-volume self-compacting concrete which is composed of a cementing material, aggregate, a composite additive and mixing water. In terms of per cubic meter of the concrete,the adding amount of the cementing material is 500-600 kg, the adding amount of the aggregate is 1640-1730 kg, the adding amount of the composite additive is 9-12 kg, and the ratio of the adding amount of the mixing water to the adding amount of the cementing material is 0.28-0.32. The composite additive at least comprises a polycarboxylate superplasticizer and gellan gum. The invention also provides a preparation method of the large-volume self-compacting concrete. The concrete mixture is good in compactness and flowing property, the concrete setting time is prolonged, an expanding agent cangive full play to the expanding efficiency conveniently, the hydration heat peak time is delayed, and the problems of contradiction between high flowability and stability, contradiction between earlystrength and delayed coagulation, contradiction between shrinkage and expansion and the like of a self-compacting concrete mixture are solved.

Description

technical field [0001] The invention relates to a large-volume self-compacting concrete and a preparation method thereof, belonging to the technical field of concrete engineering. Background technique [0002] Concrete-filled steel pipe columns are filled with concrete into steel pipes to form a composite steel pipe structure. Since the concrete filled steel tube has a certain strength and rigidity, which can improve the seismic performance of the building, the concrete filled steel tube is considered to be an ideal building material in high-rise buildings and bridge engineering. According to the different cross-sectional forms, it can be divided into rectangular steel tube concrete columns, circular steel tube concrete columns and polygonal steel tube concrete columns. [0003] The intersecting lines between the components of the rectangular concrete-filled steel pipe columns are in the same plane, which solves the problem of the connection structure of the columns and wal...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2201/52C04B18/08C04B18/141C04B2103/0068C04B24/32C04B22/14C04B22/064C04B14/02C04B14/06
Inventor 毕彦春许慧孙君光王博尹江涛赵佳盛智高瑞
Owner CHINA RAILWAY CONSTR ENG GROUP
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