Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of Lightweight Aggregate on Early-Age Autogenous Shrinkage of Concrete
The total early-age shrinkage and coefficient of thermal expansion of concrete were measured by a corrugated pipe system. The effects of prewetted and dry lightweight coarse aggregate (LWA) on the autogenous shrinkage of concrete at early age (1 day), including liquid phase, skeleton-formational phase, and hardening phase, were investigated and discussed. It was confirmed that the early-age autogenous shrinkage of concrete depends on the constraint intensity on the hardening cement paste (HCP) by coarse aggregate and the effective water-cement ratio (w/c). The effective w/c has a much stronger influence during the liquid phase than other two phases; however, the constraint imposed by coarse aggregate becomes the dominant factor during the skeleton-formational phase. During the hardening phase, concrete made with prewetted LWA expands; at the same time, the chemical shrinkage and self-desiccation are insignificant.
Effect of Lightweight Aggregate on Early-Age Autogenous Shrinkage of Concrete
The total early-age shrinkage and coefficient of thermal expansion of concrete were measured by a corrugated pipe system. The effects of prewetted and dry lightweight coarse aggregate (LWA) on the autogenous shrinkage of concrete at early age (1 day), including liquid phase, skeleton-formational phase, and hardening phase, were investigated and discussed. It was confirmed that the early-age autogenous shrinkage of concrete depends on the constraint intensity on the hardening cement paste (HCP) by coarse aggregate and the effective water-cement ratio (w/c). The effective w/c has a much stronger influence during the liquid phase than other two phases; however, the constraint imposed by coarse aggregate becomes the dominant factor during the skeleton-formational phase. During the hardening phase, concrete made with prewetted LWA expands; at the same time, the chemical shrinkage and self-desiccation are insignificant.
Effect of Lightweight Aggregate on Early-Age Autogenous Shrinkage of Concrete
Tao Ji (Autor:in) / Bin-bin Zhang / Yi-Zhou Zhuang / Hwai-Chung Wu
ACI materials journal ; 112
2015
Aufsatz (Zeitschrift)
Englisch
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