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Self compact concrete

A self-compacting concrete and coarse aggregate technology, which is applied in the field of construction engineering materials, can solve the problems of excessive heat of hydration, high cost, and large amount of cement, and achieve the effect of simple preparation and cost reduction

Inactive Publication Date: 2013-12-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the amount of cement is too large, the heat of hydration will be too large and the shrinkage value of concrete will be too large, which will have an adverse effect on the crack control and durability of concrete.
At the same time, the large amount of cement and the variety of admixtures will make the configuration of self-compacting concrete more complex and expensive, especially the higher-strength self-compacting concrete above C40 is more costly, which limits the popularization and application of self-compacting concrete

Method used

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Embodiment approach 1

[0017] Embodiment 1: The self-compacting concrete of this embodiment is prepared according to the following composition weight ratio: cement 290 kg / m 3 , fly ash 160 kg / m 3 , coarse aggregate 891 kg / m 3 , fine aggregate 754 kg / m 3 , superplasticizer 5.29 kg / m 3 , water consumption 155 kg / m 3 . The fineness modulus of fine aggregate is 2.8. The cement is C42.5 ordinary Portland cement, with a specific surface area of ​​370-420 kg / m 3 . Coarse aggregate is continuously graded, with a nominal particle size of 5-25mm and a void ratio of less than 40%. Among them, those with a nominal particle size of 20-25mm account for 8% of the total mass of the coarse aggregate, and those with a nominal particle size of 15-20mm account for 8% of the total mass of the coarse aggregate. 17% of the total mass of coarse aggregate, 32% of the total mass of coarse aggregate with a nominal particle size of 10-15mm, and 43% of the total mass of coarse aggregate with a nominal particle size of 5-...

Embodiment approach 2

[0024] Embodiment 2: The self-compacting concrete of the present embodiment is prepared according to the following composition weight ratio: cement 250kg / m 3 , fly ash 200 kg / m 3 , coarse aggregate 820 kg / m 3 , fine aggregate 700kg / m 3 , superplasticizer 12 kg / m 3 , water consumption 145 kg / m 3 ; Among them, the particle size of coarse aggregate is 5-25mm, and the fineness modulus of fine aggregate is 2.5. Cement is C40. Coarse aggregates are continuously graded, with a nominal particle size of 5-25mm and a void ratio of 38%; among them, those with a nominal particle size of 20-25mm account for 12% of the total mass of the coarse aggregate, and those with a nominal particle size of 15-20mm account for 13% of the total mass, 28% of the total mass of coarse aggregate with a nominal particle size of 10-15mm, and 47% of the total mass of coarse aggregate with a nominal particle size of 5-10mm. The fly ash is Class I fly ash. The water reducing agent is a polycarboxylate hig...

Embodiment approach 3

[0025] Embodiment 3: The self-compacting concrete of this embodiment is prepared according to the following composition weight ratio: cement 300kg / m 3 , fly ash 120 kg / m 3 , coarse aggregate 950 kg / m 3 , fine aggregate 850 kg / m 3 , superplasticizer 5 kg / m 3 , water consumption 160 kg / m 3 ; Among them, the particle size of coarse aggregate is 5-25mm, and the fineness modulus of fine aggregate is 2.6. Cement is C45. Coarse aggregates are continuously graded, with a nominal particle size of 5-25mm and a void ratio below 40%; among them, those with a nominal particle size of 20-25mm account for 10% of the total mass of the coarse aggregate, and those with a nominal particle size of 15-20mm account for 10% of the total mass of the coarse aggregate. 15% of the total mass of coarse aggregate, 30% of the total mass of coarse aggregate with a nominal particle size of 10-15mm, and 45% of the total mass of coarse aggregate with a nominal particle size of 5-10mm. The fly ash is Clas...

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Abstract

The invention relates to self compact concrete, and belongs to the technical field of constructional engineering materials. The self compact concrete comprises the following components by weight: concrete 250-300 kg / m<3>, pulverized fuel ash 120-200 kg / m<3>, coarse aggregate 820-950 kg / m<3>, fine aggregate 700-850 kg / m<3>, water reducer 5-12 kg / m<3>, and water supply volume 145-160 kg / m<3>; the particle size of the coarse aggregate is 5-25 mm, and the fineness modulus of the fine aggregate is 2.5-2.8. The optimal proportion of the self compact concrete is concrete 290 kg / m<3>, pulverized fuel ash 160 kg / m<3>, coarse aggregate 891 kg / m<3>, fine aggregate 754 kg / m<3>, and water reducer 5.29 kg / m<3>. Compared with the prior art, the self compact concrete has the advantages that concrete consumption is about 35-55 kg / m<3>, the varieties of additives and admixtures are few, the preparation is simple, and the cost can be lowered to 30 yuan / m<3> at least.

Description

technical field [0001] The invention relates to self-compacting concrete, which belongs to the technical field of building engineering materials. Background technique [0002] Self-compacting high-performance concrete is a new type of high-tech concrete that has high fluidity without segregation and bleeding at low water-to-binder ratio, and can be leveled by its own weight without vibration and filled with models and wrapped steel bars. Technology produces excellent concrete of uniform quality. The main performance of self-compacting high-performance concrete is that it can fill the formwork space by itself without vibrating under the action of its own weight, and can be used for structures that are difficult to pour or even impossible to pour. The concrete structure formed by self-compacting has good mechanical properties and durability. Since self-compacting high-performance concrete is vibration-free, it can save labor and electricity, improve construction efficiency, ...

Claims

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Application Information

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IPC IPC(8): C04B28/04
Inventor 伍曾徐清高云起赵宇王丽亚李洁青
Owner KUNMING UNIV OF SCI & TECH
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