Effect of Presoaked Expanded Perlite Aggregate on the Dimensional Stability and Mechanical Properties of Engineered Cementitious Composites
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 6
Abstract
This paper reports on an investigation of the use of expanded perlite aggregate as saturated lightweight aggregate (LWA) with respect to the mechanical and dimensional stability properties of engineered cemetitious composites (ECC). Expanded perlite aggregate was soaked in water for 24 h before its use in ECC, and replaced 10, 20, and 30% of the aggregate that was used in ECC production. The mixture proportion of a standard ECC mixture with properties that have been extensively reported in the literature is used as a reference. The properties of the specimens are compared in terms of compressive strength, flexural strength, midspan beam deflection capacity, matrix fracture toughness, drying shrinkage, autogenous shrinkage, and restrained shrinkage. The compressive strength and flexural strength of the specimens were adversely affected with presoaked LWA replacement. Midspan beam deflection capacities were partially improved, whereas matrix fracture toughness values decreased by the presoaked LWA replacement, which is beneficial with respect to the multiple cracking behavior of ECC. Presoaked LWA replacement slightly increased the drying shrinkage with respect to the reference mixture. However, the use of presoaked expanded perlite aggregate in ECC production increased the age of restrained shrinkage cracking and decreased the autogenous shrinkage capacity significantly. Therefore, together with the comparable and enhanced composite mechanical, ductility, and dimensional properties of the standard ECC mixture, the use of presoaked LWA in ECC production should improve the durability and extend the service life of structures under environmental exposure.
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Acknowledgments
The writers gratefully acknowledge the financial assistance of the Scientific and Technical Research Council (TUBITAK) of Turkey, provided under Project MAG-108M495, Gaziantep University Scientific Research Center, provided under Project MF.10.09. The writers convey their sincere thanks to Mr. Hasan E. Yucel for his comments and suggestions.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 6 • June 2013
Pages: 763 - 771
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 7, 2012
Accepted: Jul 13, 2012
Published online: Aug 28, 2012
Published in print: Jun 1, 2013
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