Journal
CEMENT AND CONCRETE RESEARCH
Volume 91, Issue -, Pages 13-23Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2016.10.003
Keywords
Alkali-activated concrete; Drying shrinkage; Autogenous shrinkage; Fly ash; Slag cement
Funding
- University Transportation Research Center, Region 2 (UTRC2) through the University Transportation Centers program
- National Science Foundation (NSF) under CMMI Award [1055641]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1055641] Funding Source: National Science Foundation
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The problem of excessive drying shrinkage in alkali-activated concrete (AAC) is well-documented in the literature. The magnitude of drying shrinkage is often three or more times that in portland cement concrete. This study investigates the effects of binder type, activator concentration, strength, age, and curing method on the manifestation of drying shrinkage in alkali-activated fly ash and slag cement concrete. Early-age shrinkage strains in excess of 1200 mu epsilon (0.12 percent strain) are observed in AAC. This is attributed to delayed hydration, microstructure refinement, and strength development. The resulting damage is far more significant than in portland cement concrete. Shrinkage and resulting damage are greatly reduced when specimens are dried at later age and after heat-curing. Alkali-activated slag cement concrete is more sensitive to water loss than portland cement or alkali-activated fly ash concrete. This results from a finer pore structure in alkali-activated slag binders. (C) 2016 Elsevier Ltd. All rights reserved.
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