Effect of lightweight aggregates on the mechanical properties and brittleness of lightweight aggregate concrete
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- 作者：H.Z. Cui ; Tommy Yiu Lo ; Shazim Ali Memon ; Weiting Xu
- 关键词：Lightweight aggregate concrete ; Compressive strength ; Young&rsquo ; s modulus ; Shape Index ; Proportional strain ratio
- 刊名：Construction and Building Materials
- 出版年：2012
- 出版时间：October, 2012
- 年：2012
- 卷：35
- 期：Complete
- 页码：149-158
- 全文大小：2048 K
文摘
The influence of volume fraction and aggregate properties on the mechanical performance of lightweight aggregate concrete (LWAC) were studied. A new Shape Index that described the shape characteristics of lightweight aggregate (LWA) has been proposed and its effects on resulting LWAC were evaluated. Test results substantiate that the proposed Shape Index had a great influence on the mechanical properties of LWAC.
Crack development, failure characteristics and stress strain curves of LWAC were studied and the concept of the proportional strain ratio was introduced to evaluate the brittleness of LWAC. Test results showed that higher volume content of LWA resulted in a more brittle failure. It was also found out that for similar concrete strengths, LWAC was comparatively brittle than normal weight concrete (NWC).