Effect of natural and recycled aggregate packing on properties of concrete blocks

被引：67

作者：

Chu, S. H. ^{[1
]}

Poon, Chi Sun ^{[1
]}

Lam, C. S. ^{[1
]}

Li, L. ^{[1
]}

机构：

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

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2021年 / 278卷

关键词：

Recycled aggregate; Concrete paving blocks; Skid and abrasion; Particle packing; Strength; PERFORMANCE; PARTICLES; MIXTURES; POROSITY; VOLUME;

D O I：

10.1016/j.conbuildmat.2021.122247

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Recycled aggregate (RA) could be re-utilized in concrete paving blocks. However, the use of RA in concrete might lead to inferior performance, which constitutes a major barrier in the wider application of recycled aggregate concrete (RAC). To tackle this issue, one promising solution might be the tailoring of aggregate packing without increasing the cement content, carbon footprint and cost. In this study, an experimental program was carried out to systematically investigate the effect of packing density on the properties of concrete blocks. Tests results showed that appropriate proportioning of RA increased the packing density and thus the compressive strength to approach that of natural aggregate (NA) mixtures. Such increased packing density was conducive to the performance of concrete blocks. After packing optimization, RAC exhibited comparable strength to that of NA concrete. Lastly, prediction equations were derived for various performance attributes of concrete paving blocks based on particle packing. (C) 2021 Elsevier Ltd. All rights reserved.

引用

页数：12

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