Effect of Saturated Lightweight Aggregate and SRA on the Hydration Process and Autogenous Shrinkage of UHPC

被引：0

作者：

Xu B. ^{[1
]}

Ou Z. ^{[1
,2
]}

Luo W. ^{[1
]}

Liu N. ^{[1
]}

Yuan W. ^{[1
]}

Fu L. ^{[1
]}

机构：

[1] Department of Military Infrastructure, Army Logistics University of PLA, Chongqing

[2] College of Material Science and Engineering, Sichuan University of Science & Engineering, Zigong

来源：

Cailiao Daobao/Materials Reports | 2020年 / 34卷 / 22期

基金：

中国国家自然科学基金;

关键词：

Autogenous shrinkage; Hydration process; Saturated lightweight aggregate; Shrinkage reducing agent (SRA); Ultra-high performance concrete (UHPC);

D O I：

10.11896/cldb.19110228

中图分类号：

学科分类号：

摘要：

This paper investigated the influence of saturated lightweight aggregate, shrinkage reducing agent (SRA) and the combined effects of both on the hydration process and autogenous shrinkage of ultra-high performance concrete (UHPC) by testing the setting time, compressive strength, hydration heat autogenous shrinkage and relative humidity. The results showed that saturated lightweight aggregate and SRA can reduce autogenous shrinkage of UHPC. At 50% replacement of lightweight aggregate, the autogenous shrinkage decreased significantly, 7.2% of the reference. The reason can be ascribed to the fact that the internal curing water slowly released in 4 d, mitigating the self-desiccation effect, which indicated that internal curing was effective in reducing autogenous shrinkage of UHPC, but bad for its mechanical properties. Simultaneously, lightweight aggregate at lower replacement together with SRA exert an comprehensive effect on restriction of autogenous shrinkage of UHPC. The porous structure of lightweight aggregate produce certain adsorption effect of SRA, reducing its effective content in initial pore solution, maintaining the internal relative humidity to decrease autogenous shrinkage, and mitigating the adverse impact on the early strength and the hydration process. © 2020, Materials Review Magazine. All right reserved.

引用

页码：22065 / 22069

页数：4

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