Pre-soaked Lightweight Fine Aggregates as Additives for Internal Curing in Concrete

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Title: Pre-soaked Lightweight Fine Aggregates as Additives for Internal Curing in Concrete

Author(s): Y. Wei and W. Hansen

Publication: Special Publication

Volume: 256

Issue:

Appears on pages(s): 35-44

Keywords: autogenous shrinkage; internal curing; moisture warping; self-desiccation shrinkage; self-induced stress

Date: 10/1/2008

Abstract:
High-performance concrete (i.e. water-cementitious ratio below 0.40) for bridge-deck applications has been shown to develop shrinkage-related cracking. This study explores the concept of internal curing using pre-soaked lightweight fine aggregate (LWFA) as partial replacement of sand for mitigating autogenous shrinkage and moisture warping. Concretes with water-cementitious ratios (w/c) of 0.35 and 0.45 containing LWFA to sand ratios of 20% and 40% by volume were investigated. Results show that pre-soaked LWFA is effective in mitigating autogenous shrinkage but also reduces slab uplift from moisture warping due to combined drying shrinkage at the top surface and wetting at the bottom surface.