Eco-friendly self-compacting concrete prepared through complete recycling of waste concrete

A technology for self-compacting concrete and waste concrete, applied in the field of building materials, can solve the problems of no self-compacting concrete research and application reports, restricting the reuse of waste concrete, failing to realize waste concrete, etc., and achieving stable and controllable quality, ecological and environmental protection. Significant effect, good effect of ecological and environmental protection effect

Inactive Publication Date: 2015-07-22
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of waste is inevitably produced in the production process of recycled aggregate. If it is not used, it will not only cause a lot of waste of resources, but also affect the local ecological environment, which greatly limits the reuse of waste concrete. Studies have shown that it can be ground into recycled micropowder for use in concrete, and some beneficial results have been achieved
[0004] At present, the main problems of reusing waste concrete to prepare self-compacting concrete are: (1) It is mainly prepared from recycled aggregate produced from waste concrete, and there are basically no research and application reports on the preparation of self-compacting concrete by using recycled micropowder; (2) ) Using recycled coarse and fine aggregates alone or using recycled coarse and fine aggregates to prepare self-compacting concrete failed to achieve full regeneration of waste concrete to prepare self-compacting concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Production of the eco-friendly waste concrete fully recycled self-compacting concrete 1m 3 , take 350kg of cement, 70kg of fly ash (such as Class I fly ash sold by Lingshou County Tianyan Mineral Products Processing Factory), 35kg of mineral powder, 70kg of recycled micropowder, and 4kg of polycarboxylate superplasticizer (such as Shandong Boke Chemical Co., Ltd. BSK-101 polycarboxylate superplasticizer sold by Co., Ltd.), 820kg of recycled fine aggregate, 860kg of recycled coarse aggregate, and 190kg of water. Mix the above materials with a concrete mixer to produce fully recycled waste concrete that is ecologically friendly. Using self-compacting concrete, its workability and 28d strength are shown in Table 1.

Embodiment 2

[0022] Production of the eco-friendly waste concrete fully recycled self-compacting concrete 1m 3 , Take 300kg of cement, 45kg of fly ash, 60kg of mineral powder, 90kg of recycled micropowder, 4.5kg of polycarboxylate superplasticizer, 820kg of recycled fine aggregate, 920kg of recycled coarse aggregate, and 170kg of water, and mix the above materials through a concrete mixer , the eco-friendly waste concrete fully recycled self-compacting concrete can be prepared, and its workability and 28d strength are shown in Table 1.

Embodiment 3

[0024] Production of the eco-friendly waste concrete fully recycled self-compacting concrete 1m 3 , Take 300kg of cement, 75kg of fly ash, 30kg of mineral powder, 60kg of recycled micropowder, 3kg of polycarboxylate superplasticizer, 820kg of recycled fine aggregate, 950kg of recycled coarse aggregate, and 145kg of water, and mix the above materials through a concrete mixer. Eco-friendly waste concrete fully recycled self-compacting concrete can be prepared, and its workability and 28d strength are shown in Table 1.

[0025] Table 1 Workability and 28d compressive strength of fully recycled self-compacting concrete from ecologically friendly waste concrete

[0026] example

[0027] It can be seen from the above table that the self-compacting concrete prepared by the present invention has high self-compacting performance, strong compressive strength, and excellent workability (fluidity, cohesion, water retention).

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Abstract

The invention discloses eco-friendly self-compacting concrete prepared through complete recycling of waste concrete. The eco-friendly self-compacting concrete comprises components in parts by weight as follows: 100 parts of cement, 10-25 parts of fly ash, 10-25 parts of mineral powder, 20-40 parts of recycled micro-powder, 1-2 parts of a polycarboxylate superplasticizer, 230-380 parts of recycled fine aggregate, 240-400 parts of recycled coarse aggregate and 45-60 parts of water which are mixed. The coarse aggregate only adopts the recycled coarse aggregate, the fine aggregate only adopts the recycled fine aggregate, the recycled micro-powder formed by grinding waste materials produced in production of the recycled aggregate is blended into a mineral admixture, so that complete recycling of the waste concrete is realized, and the eco-friendly self-compacting concrete has a very good eco-friendly effect.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a vibration-free, eco-friendly, fully recycled waste concrete self-compacting concrete (that is, a self-compacting concrete containing fully recycled waste concrete). Background technique [0002] Self-compacting concrete is named based on the construction performance of concrete, which means that freshly mixed concrete has high fluidity, good cohesion, no segregation, no bleeding, and can self-compact without vibration or less vibration. In the traditional slump test, the concrete that stays flat and flows through the mold filled with steel bars by itself has a slump of more than 250mm and a slump expansion of more than 600mm. Self-compacting concrete can be compacted by itself, avoiding the influence of human factors such as over-vibration, leakage vibration and disturbing the position of formwork, steel bars and embedded parts during construction, ensuring the quality of the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B28/04C04B18/16
CPCY02W30/91
Inventor 徐亦东何智海沈建生
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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