Self-compacting concrete

A technology of self-compacting concrete and mixed sand, which is applied in the field of concrete, can solve the problems of large amount of cementitious materials and large shrinkage, and achieve the effects of improving volume stability, good cohesion, and improving cohesion

Inactive Publication Date: 2017-12-22
GUANGXI ROAD & BRIDGE ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although self-compacting concrete has many advantages, compared with ordinary concrete, self-compacting concrete will shrink more due to the large amount of cementitious materials

Method used

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  • Self-compacting concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A self-compacting concrete, comprising the following components by weight: 400 parts of cement, 80 parts of fly ash, 50 parts of slag powder, 50 parts of calcium oxide expansion agent, 9 parts of silica fume, 800 parts of mixed sand, and 948 parts of gravel , 140 parts of drinking water, 3 parts of composition additives and a high-performance water reducing agent accounting for 1% of the mass fraction of the above-mentioned gelling material.

[0028] The above crushed stone is a mixture of large stones with a particle size of 10-16 mm and small stones with a particle size of 5-8 mm, and the weight ratio of the small stones to the large stones is 1:1.3. The cement is Portland cement with a strength grade of 42.5, and the fly ash is first-class fly ash. The mixed sand is mixed sand including medium sand, ultra-fine sand and machine-made sand, the fineness modulus of the mixed sand is 2.3, the mud content in the mixed sand is not more than 2wt%, and the stone powder conten...

Embodiment 2

[0031] A self-compacting concrete, comprising the following components by weight: 350 parts of cement, 60 parts of fly ash, 56 parts of slag powder, 62 parts of ettringite expansion agent, 12 parts of silica fume, 750 parts of mixed sand, and 1010 parts of crushed stone 150 parts, 150 parts of drinking water and a high-performance water reducing agent accounting for 2% of the mass fraction of the above-mentioned gelling material.

[0032] The crushed stone is a mixture of large stones with a particle size of 16-20 mm and small stones with a particle size of 8-10 mm, and the weight ratio of the small stones to the large stones is 1:1.5. The cement is Portland cement with a strength grade of 52.5, and the fly ash is first-grade fly ash. The mixed sand is mixed sand including medium sand, ultra-fine sand and machine-made sand, the fineness modulus of the mixed sand is 3.0, the mud content in the mixed sand is not more than 2wt%, and the stone powder content in the mixed sand is n...

Embodiment 3

[0035] A self-compacting concrete, including 360 parts of cement, 54 parts of fly ash, 52 parts of slag powder, 53 parts of expansion agent composed of calcium oxide and calcium sulfoaluminate in a weight ratio of 1:1, 11 parts of silica fume, mixed sand 748 parts, 1020 parts of gravel, 156 parts of drinking water, 6 parts of composition additives and a high-performance water reducing agent accounting for 1.5% of the mass fraction of the above-mentioned gelling material.

[0036]The crushed stone is a mixture of large stones with a particle size of 10-20 mm and small stones with a particle size of 5-10 mm, and the weight ratio of the small stones to the large stones is 1:1.4. The cement is Portland cement with a strength grade of 42.5, and the fly ash is first-class fly ash. The mixed sand is mixed sand including medium sand, ultra-fine sand and machine-made sand, the fineness modulus of the mixed sand is 2.5, the mud content in the mixed sand is not more than 2wt%, and the st...

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Abstract

The invention discloses a self-compacting concrete and belongs to the technical field of concrete. The self-compacting concrete comprises the following components in parts by weight: 350-400 parts of cement, 54-80 parts of coal ash, 52-60 parts of slag powder, 50-62 parts of expanding agent, 9-13 parts of silica powder, 748-800 parts of mixed sand, 948-1020 parts of macadam, 140-165 parts of drinking water, 0-10 parts of compound additive and high-performance additive being 1-2% of the binding material in mass fraction. The concrete acquired according to the invention has excellent self-compacting property, fluidity, collapse prevention, cohesiveness and separation resistance, and meanwhile, a test proves that the compressive strength after 7 days is about 57MPa and the compressive strength after 28 days is about 70MPa, so that the concrete provided by the invention has higher compressive strength.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to self-compacting concrete. Background technique [0002] Self-compacting concrete refers to the concrete that can flow and compact under its own gravity, and can completely fill the formwork even if there are dense steel bars, and at the same time obtain good homogeneity and do not require additional vibration. [0003] Although self-compacting concrete has many advantages, compared with ordinary concrete, self-compacting concrete will shrink more due to the large amount of cementitious materials used. If a certain amount of expansion agent (calcium oxide expansion agent) is added to prepare self-compacting concrete, the shrinkage can be effectively compensated, and the risk of cracking caused by shrinkage deformation of the concrete structure can be greatly reduced. However, due to the inherent characteristics of calcium oxide expansion agents - hydration consumes a large amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/20C04B2201/50C04B18/08C04B18/141C04B22/064C04B14/06C04B14/02C04B22/002C04B22/16C04B14/304C04B14/46C04B2103/302C04B2103/308C04B24/10C04B24/34C04B24/383C04B24/42C04B22/142C04B24/06
Inventor 王建军周邦鸿韩玉苏萍杨占峰王承亮韦仕学蓝新玲唐超袁征何建乔翁贻令
Owner GUANGXI ROAD & BRIDGE ENG GRP CO LTD
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