Correlating Thixotropy of Self-Consolidating Concrete to Stability, Formwork Pressure, and Multilayer Casting
- 1 October 2016
- journal article
- Published by American Society of Civil Engineers (ASCE) in Journal of Materials in Civil Engineering
- Vol. 28 (10)
Abstract
The use of self-consolidating concrete (SCC) gained wide acceptance in the construction industry. The main objective of this paper is to classify the performance of freshly mixed SCC including stability, formwork pressure, and multilayer casting according to its thixotropic level (AThix); this would facilitate prediction of casting and precasting results at the construction site. Test results showed that low thixotropic mixtures having AThix less than 0.2 Pa/s are not recommended for construction works given the reduced stability associated with high bleeding and sedimentation rates. In contrast, high thixotropic mixtures with AThix larger than 0.75 Pa/s are very stable, and particularly adapted for casting vertical elements given the reduced formwork pressure. Yet those later mixtures are very sensitive to delays or stoppages between successive concrete lifts, resulting in reduced interfacial bond strengths. The moderate thixotropic mixtures having AThix between 0.2 and 0.75 Pa/s showed adequa...Keywords
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