Self heat-insulation recycled concrete substituted by all recycled coarse aggregate and application thereof

A technology for recycling coarse aggregate and recycled concrete, applied in the field of building materials, can solve the problems of reduced work performance and elastic modulus, increased water-cement ratio of recycled concrete, difficult application of recycled concrete, etc., so as to reduce damage and improve building energy conservation. The effect of leveling, reducing the size of the structure

Inactive Publication Date: 2016-02-03
SANMING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with natural aggregates, recycled aggregates have disadvantages such as low strength, large porosity, and high water absorption, which will increase the water-cement ratio of recycled concrete, reduce work performance and elastic modulus, and increase shrinkage and creep. This makes it difficult to apply recycled concrete to the preparation of building load-bearing structures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A self-insulating recycled concrete replaced by fully recycled coarse aggregate, the raw materials used are: water 304kg / m 3 , cement 425kg / m 3 , tailings fine powder 25kg / m 3 , recycled coarse aggregate 936kg / m 3 , natural river sand 187kg / m 3 , recycled fine aggregate 62kg / m 3 , vitrified microbeads 165kg / m 3 , water reducer 1.74kg / m 3 .

Embodiment 2

[0030] A self-insulating recycled concrete replaced by fully recycled coarse aggregate, the raw materials used are: water 310kg / m 3 , cement 475kg / m 3 , tailings fine powder 64kg / m 3 , recycled coarse aggregate 936kg / m 3 , natural river sand 217kg / m 3 , recycled fine aggregate 107kg / m 3 , vitrified microbeads 211kg / m 3 , superplasticizer 2.15kg / m 3 .

Embodiment 3

[0032] A self-insulating recycled concrete replaced by fully recycled coarse aggregate, the raw materials used are: water 320kg / m 3 , cement 525kg / m 3 , tailings fine powder 83kg / m 3 , recycled coarse aggregate 936kg / m 3 , natural river sand 250kg / m 3 , recycled fine aggregate 125kg / m 3 , vitrified beads 220kg / m 3 , superplasticizer 2.56kg / m 3 .

[0033] The performance indexes of self-insulation concrete obtained in Examples 1-3 of the present invention are as follows: under standard curing conditions, the compressive strength of 28d cubes is 14.1MPa~20.7MPa, and the natural density is 1627kg / m 3 ~1812kg / m 3 , than the natural density of ordinary concrete (2400kg / m 3 ) is 24.5%~32.2% lower, and the thermal conductivity is 0.406W / (m·K)~0.686W / (m·K), which is 57.9%~75.1% lower than that of ordinary concrete [1.63W / (m·K)].

[0034] The existing vitrified microbead self-insulating concrete, when the density and thermal conductivity are low, it is difficult to meet the st...

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PUM

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Abstract

The invention discloses self heat-insulation recycled concrete substituted by all recycled coarse aggregate and application thereof, water of 304-320 kg/m<3>, cement of 425-525 kg/m<3>, tailing micro powder of 25-83 kg/m<3>, recycled coarse aggregate of 936 kg/m<3>, natural river sand of 187-250 kg/m<3>, recycled fine aggregate of 62-125 kg/m<3>, glass beads of 165-220 kg/m<3> and a water reducing agent of 1.74-2.56 kg/m<3> are raw materials, and the recycled concrete which is low in heat conductivity and good in heat insulation effect is prepared. The obtained concrete is used for manufacturing self heat-insulation recycled concrete blocks, cast-in-place concrete partition walls, bearing walls, prefabricated low-diathermancy walls and plates and the like, and good economic benefits can be obtained.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a self-insulating recycled concrete replaced by fully recycled coarse aggregate and its application. Background technique [0002] Ordinary concrete production requires quarrying to produce coarse aggregate, and sand mining from rivers or machine-made mountain sand is used as fine aggregate. This production method not only damages the environment, but also produces concrete with high thermal conductivity and poor thermal insulation performance. At the same time, with the increasing energy shortage and the country's emphasis on environmental protection, the resource utilization of construction waste has attracted more and more attention from scholars from all over the world. [0003] The porous nature of recycled aggregate makes it better in thermal insulation than natural aggregate. The recycled concrete prepared from it is used to prepare non-stressed stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/16C04B14/24
CPCY02W30/91
Inventor 张会芝刘纪峰崔秀琴
Owner SANMING UNIV
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