A kind of 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 the problems of cracking durability, voiding, and uncompacted concrete, and achieve the effects of improving pore structure, reducing porosity, and improving compactness.

Active Publication Date: 2022-02-15
CHINA RAILWAY CONSTR ENG GRP
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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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  • A kind of large-volume self-compacting concrete and preparation method thereof
  • A kind of 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 a large-volume self-compacting concrete, which is composed of a cementitious material, aggregates, a composite admixture and mixing water; the cementing material is added in an amount of 500kg-600kg per cubic meter of concrete, the aggregate is The added amount is 1640kg-1730kg, the added amount of the composite admixture is 9kg-12kg, and the ratio of the added amount of mixing water to the added amount of the cementitious material is 0.28 to 0.32; the composite admixture at least includes polycarboxylate superplasticizer and Gellan gum. The invention also provides a preparation method of large-volume self-compacting concrete. The concrete mixture of the invention has good compaction performance and good flow performance, prolongs the concrete setting time, facilitates the expansion agent to fully exert the expansion performance, delays the peak time of hydration heat, and solves the problem of the large fluidity and stability of the self-compacting concrete mixture. The contradiction between early strength and retardation, the contradiction between contraction and expansion, etc.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2201/52C04B18/08C04B18/141C04B2103/0068C04B24/32C04B22/14C04B22/064C04B14/02C04B14/06
Inventor 毕彦春许慧钱桂枫王博尹江涛赵佳盛智孙君光高瑞黄家华
Owner CHINA RAILWAY CONSTR ENG GRP
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