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Self-compacting non-shrinkage concrete-filled steel tube

A technology for shrinking steel pipes and concrete, applied in the field of concrete, can solve the problems of slow strength growth, low elastic modulus, fast slump loss, etc., and achieve long-term stable expansion performance, high expansion performance, and increased segregation resistance

Inactive Publication Date: 2018-01-12
GUANGXI ROAD & BRIDGE ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent characteristics of calcium oxide expansion agents - hydration consumes a large amount of water, which has a great impact on the workability of self-compacting concrete, especially the rapid loss of slump, so higher requirements are put forward for the selection of raw materials and the design of the mix ratio. In addition, it also has a certain impact on the mechanical properties of concrete, resulting in slow strength growth and a decrease in elastic modulus.

Method used

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  • Self-compacting non-shrinkage concrete-filled steel tube

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A self-compacting non-shrinkage steel pipe concrete, comprising the following components by weight: 400 parts of cement, 65 parts of fly ash, 25 parts of slag powder, 80 parts of composite expansion agent, 700 parts of mixed sand, 1050 parts of gravel, drinking water 160 parts and 1.7% of the high-performance admixture accounting for the total mass fraction of the above-mentioned gelling material, that is, 9.7 parts of the high-performance admixture in this embodiment.

[0027] The composite expansion agent includes 30 parts of light-burned calcium oxide clinker, 20 parts of light-burned magnesium oxide clinker, 10 parts of gypsum and 10 parts of fly ash. The CaO content in the light-burned calcium oxide clinker oxide composition in the composite expansion agent is 90wt%; the MgO content in the light-burned magnesium oxide clinker oxide composition in the composite expansion agent is 95wt%, and the activity index is 100s. The preparation method of the composite expansio...

Embodiment 2

[0032] A self-compacting non-shrinkage steel pipe concrete, comprising the following components by weight: 392 parts of cement, 53 parts of fly ash, 35 parts of slag powder, 50 parts of composite expansion agent, 770 parts of mixed sand, 1045 parts of gravel, drinking water 155 parts and high-performance admixtures accounting for 1.8% of the total mass fraction of the above-mentioned cementitious materials.

[0033] The above-mentioned composite expansion agent includes 40 parts of light-burned calcium oxide clinker, 40 parts of light-burned magnesium oxide clinker, and 20 parts of gypsum. The CaO content in the light-burned calcium oxide clinker oxide composition in the composite expansion agent is 90wt%; the MgO content in the light-burned magnesium oxide clinker oxide composition in the composite expansion agent is 95wt%, and the activity index is 150s. The preparation method of the composite expansion agent is to sinter the light-burned calcium oxide clinker and the light-...

Embodiment 3

[0038] A self-compacting non-shrinkage steel pipe concrete, including 365 parts of cement, 100 parts of fly ash, 15 parts of slag powder, 60 parts of composite expansion agent, 740 parts of mixed sand, 1070 parts of crushed stone, 150 parts of drinking water and the above-mentioned gelling The high-performance admixture with a total mass fraction of 1.8% of the material.

[0039] The above-mentioned composite expansion agent includes 60 parts of light-burned calcium oxide clinker, 40 parts of light-burned magnesium oxide clinker, and 20 parts of fly ash. The CaO content in the light-burned calcium oxide clinker oxide composition in the composite expansion agent is 90wt%; the MgO content in the light-burned magnesium oxide clinker oxide composition in the composite expansion agent is 95wt%, and the activity index is 200s. The preparation method of the composite expansion agent is to sinter the light-burned calcium oxide clinker and the light-burned magnesium oxide clinker at 15...

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Abstract

The invention discloses a self-compacting non-shrinkage concrete-filled steel tube, belonging to the technical field of concrete. The self-compacting non-shrinkage concrete-filled steel tube is prepared from the following components in parts by weight: 360-400 parts of cement, 53-100 parts of coal ash, 15-35 parts of ground slag, 50-80 parts of a compound expansion agent, 700-770 parts of mixed sand, 1040-1070 parts of gravel, 150-160 parts of drinking water and a high performance admixture, wherein the amount of the high performance admixture accounts for 1.7-1.8% of the total mass of a cementing material by mass percent. The self-compacting non-shrinkage concrete-filled steel tube provided by the invention has good self-compacting property, expansibility, fluidity, slump loss resistance,cohesiveness, segregation resistance and higher compression strength; furthermore, the expansion process and strength of concrete-filled steel tube are synergistically developed.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a self-compacting non-shrinkage steel tube 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 ettringite, calcium oxide and other expansion agents are added to prepare self-compacting non-shrinkage concrete filled steel pipes, it can compensate for shrinkage and reduce the risk of cracking caused by shrinkage deformation of concrete structures. However, due to the inherent characteristics of calcium oxide expansion agents -...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 王建军周邦鸿韩玉徐文苏萍杨占峰王承亮韦仕学蓝新玲王毅袁征何建乔翁贻令
Owner GUANGXI ROAD & BRIDGE ENG GRP CO LTD
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