Recycled aggregate concrete and workability and durability improvement additive

A technology of recycled aggregate and concrete, applied in the field of building materials, can solve the problem of difficult control of concrete, impermeability of recycled concrete, carbonization resistance, sulfate corrosion resistance, chloride ion permeability resistance, wear resistance, crack resistance It is difficult to meet the project quality requirements and other problems, so as to achieve the effect of reducing the secondary waste rate, good construction and construction stability, and improving construction stability.

Inactive Publication Date: 2020-02-07
LIAONING PROVINCIAL COLLEGE OF COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the above problems, the impermeability, carbonation resistance, sulfate erosion resistance, chloride ion penetration resistance, wear resistance, and crack resistance of recycled concrete have declined to varying degrees.
It is often difficult to meet the engineering quality requirements when it is used in engineering
[0005] The research also shows that when the recycled coarse aggregate is used, the concrete slump loss is faster, and the water consumption needs to be increased by about 5-15%. Concrete is more difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: C25 economical recycled concrete series. Polycarboxylate water reducer (liquid, 20% solid) 3kg, lithium silicate 6g, composite air-entraining agent (powder 100% solid) 3.2g (wherein the micron air-entraining agent is rosin air-entraining agent 2.5g, Nano air-entraining agent 0.7g), thickening lubricant 3.5g, white sugar 5g was stirred for 3 minutes through 1000 revs high-speed stirrer, evenly formed mixed solution, after this mixed solution was mixed with 0.75kg micro-silicon powder before use, Then mix it with 300kg42.5 ordinary Portland cement, 700kg river sand, 1200kg 5-37.5mm continuous graded limestone, and 150kg water, and mix it uniformly with a forced mixer to form concrete. The initial slump of the concrete is greater than 180mm, the air content is 4%, and the number of unilateral salt freezing of the concrete is greater than 60 times.

Embodiment 2

[0041] Example 2: C30 construction of high stability recycled concrete series. Polycarboxylate superplasticizer (liquid, 20% solid) 3.8kg, lithium silicate 7.2g, composite air-entraining agent (powder 100% solid) 7.2g (wherein the micron air-entraining agent is rosin air-entraining agent 5.4 g, nanometer air-entraining agent 1.8g), thickening lubricant 7.2g, white sugar 60g was stirred 3 minutes through 1000 revs high-speed stirrer, after stirring, after this mixed solution was mixed with 2.8kg micro-silicon powder before use, The mixed solution is mixed with 380kg of 42.5 ordinary Portland cement, 720kg of river sand, 1180kg of 5-37.5mm continuous graded limestone, and 152kg of water, and is stirred evenly by a forced mixer. The initial slump of concrete is greater than 200mm, the air content is 4.5%, and the number of unilateral salt freezing of concrete is greater than 60 times.

Embodiment 3

[0042]Example 3: C30 high durability recycled concrete series. Polycarboxylate water reducer (liquid, 20% solid) 4.56kg, lithium silicate 180g, composite air-entraining agent (powder 100% solid) 7.2g (wherein rosin air-entraining agent 1.8g, nano air-entraining agent 5.4g), thickening lubricant 12.0g, sodium gluconate 40g was stirred for 3 minutes through 1000 rpm high-speed stirrer, after stirring evenly, after mixing the mixed solution with 4.6kg microsilica powder before use, the mixed solution With 380kg of 42.5 ordinary Portland cement, 720kg of river sand, 1180kg of 5-37.5mm continuous graded limestone, and 133kg of water, it is stirred evenly by a forced mixer. The initial slump of concrete is greater than 180mm, the air content is 4.5%, and the number of unilateral salt freezing of concrete is greater than 80 times.

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Abstract

The invention discloses a recycled aggregate concrete constructability and durability improvement additive and belong to the technical field of building materials. The additive comprises lithium silicate, micro-silicon powder, a composite air-entraining agent, a thickened lubricant, a polycarboxylate superplasticizer and a retarder, wherein the ratio of the lithium silicate to a polycarboxylate superplasticizer mixed solution is 0.001:0.08; the ratio of a common air-entraining agent to a nano air-entraining agent is 0.1-5; and according to weight percents of all the additives in the mixed solution, the micro-silicon powder is 0.25-1.5, the composite air-entraining agent is 0.001-0.005, the thickened lubricant is 0.001-0.003, and the retarder is 0.001-0.05. The additive is applied to concrete engineering and can substantially improve concrete constructability, stability and durability. The additive is suitable for a reinforced concrete structure, a concrete structure and other structures. By use of the additive, the viscosity of concrete can be substantially lowered, and the flow velocity, expandability, crack resistance, constructability and working stability of the concrete are improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a recycled aggregate concrete and an additive for improving workability and durability. Background technique [0002] In 2020, the output of construction waste in my country will reach an astonishing 3.966 billion tons. While the output of construction waste has increased substantially, it is facing problems such as shortage of natural aggregate resources and rising prices. The recycling of waste concrete is the most effective measure to solve the above problems. my country started the research and application of recycled aggregate concrete more than 10 years ago. However, due to policy, cost, raw material stability, especially the durability of recycled aggregate concrete, many obstacles have been set up for recycled aggregate concrete, and it has not been applied on a large scale for many years. [0003] Due to its unstable source and uneven quality, the recycled ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/34C04B24/38
CPCC04B40/0039C04B12/04C04B18/146C04B2103/304C04B2103/44C04B2103/302C04B2103/22
Inventor 赵同峰周烨李冬松
Owner LIAONING PROVINCIAL COLLEGE OF COMM
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