Effect of microstructure of ITZ on compressive strength of concrete prepared with recycled aggregates

被引：857

作者：

Poon, CS ^{[1
]}

Shui, ZH ^{[1
]}

Lam, L ^{[1
]}

机构：

[1] Hong Kong Polytech Univ, Dept Civil & Struct Engn, Kowloon, Hong Kong, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2004年 / 18卷 / 06期

关键词：

recycled aggregate; microstructure; interfacial transition zone; compressive strength;

D O I：

10.1016/j.conbuildmat.2004.03.005

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Concrete specimens were prepared with a recycled normal-strength concrete (NC) aggregate, a recycled high performance concrete (HPC) aggregate and a natural aggregate (NA) as control. The influence of these aggregates (recycled and natural) on the microstructure and compressive strength of the new concrete were studied. SEM observations revealed that the NC aggregate-cement interfacial zone consisted mainly of loose and porous hydrates whereas the HPC aggregate-cement interfacial zone consisted mainly of dense hydrates. The compressive strength results that the concrete prepared with natural aggregates was high,her than that of the recycled aggregate concrete. Also, the strength development of the HPC recycled aggregate concrete was faster than that of the NC recycled aggregate concrete. At 90 days, the HPC recycled aggregates concrete achieved similar strength values to the natural aggregate concrete. The results are explained by the differences in porosity and pore structure Of the two types of aggregates, and possible interactions between the aggregates and the cement paste. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：461 / 468

页数：8

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