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Experimental study on self shrinkage and dry shrinkage of steel fiber lightweight aggregate concrete

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Document pages: 9 pages

Abstract: Steel fiber lightweight aggregate concrete (sfrlac) has many advantages in structural engineering. In this paper, the self shrinkage and drying shrinkage of sfrlac up to 270 days were measured, and the effects of the types of coarse aggregate and fine aggregate with water binder ratio and steel fiber volume fraction were considered respectively. The workability, apparent density and compressive strength of sfrlac mixture are also reported, and the relationship with the above factors is discussed. The results showed that the self shrinkage and drying shrinkage of sfrlac developed rapidly within 28 days and tended to be stable after 90 days. With the increase of water binder ratio and the use of expansion agent, the self shrinkage development of sfrlac decreases shale with higher soundness and good water absorption, especially at early age within 28 days; the later drying shrinkage was reduced and the development of drying shrinkage was slowed down with the increasing volume fraction of steel fiber obviously; manufactured sand led to less autogenous shrinkage but greater drying shrinkage than fine lightweight aggregate in SFRLAC. The regularities of autogenous shrinkage and drying shrinkage of SFRLAC expressed as the series of hyperbola are analyzed.

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