Release of air from unsaturated aggregate during setting of concrete

被引：7

作者：

Buenfeld, NR ^{[1
]}

Okundi, E ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Civil Engn, London SW7 2BU, England

来源：

CONSTRUCTION AND BUILDING MATERIALS | 1999年 / 13卷 / 03期

关键词：

concrete porosity; aggregate absorption; compressive strength;

D O I：

10.1016/S0950-0618(98)00034-8

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Eight concrete mixes, with various mix proportions and cement replacements, were assessed for strength development in a laboratory-based trial mix programme. All concretes had substantially lower strength than expected. The cause was the release of air from partially dry aggregate after placing, prior to setting, producing air voids, typically 100 mu m in diameter, in the cement paste at the surface of aggregate particles. This paper presents the evidence, details the mechanisms involved and discusses the implications for concreting practice. (C) 1999 Elsevier Science Ltd. Ali rights reserved.

引用

页码：143 / 147

页数：5