Effects of Hydrophobic Expanded Silicate Aggregates on Properties of Structural Lightweight Aggregate Concrete
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 6
Abstract
This article addresses the performance of structural lightweight aggregate concretes and the relation of their performance to density class. Natural expanded silicate materials treated with a hydrophobic agent were used and their effects were systematically investigated. Three lightweight concretes with densities of about 1,000, 1,150, and (classes D1.0, D1.2, and D1.4) were designed by applying an optimized particle packing theory. The microstructure, mechanical properties, and durability of the developed concretes were determined and the relations of these properties with density were evaluated. The lightweight concretes showed excellent structural efficiency, with 28-day compressive strengths of about 23, 28, and 42 MPa, respectively. Microstructural analyses showed that the developed concretes had a rather compact microstructure, contributing to enhanced strength. Existing codes for calculating concrete -modulus were compared, and the best predicting formula is proposed. Mix D1.4 showed relatively low drying shrinkage, which can be attributed to relatively low initial water use and the internal curing effect brought about by the applied lightweight aggregate. The developed mixes showed excellent durability, as indicated by very low water penetration after 72 h of exposure under a pressure of 0.5 MPa (5 bars) and very small mass loss after 56 cycles of a freeze–thaw test under both deionized water and NaCl conditions.
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Data Availability Statement
All data, models and code generated or used during the study appear in the published article.
Acknowledgments
The authors wish to express their gratitude Ir. A. J. E. J. van Casteren at BAS Research & Technology for sponsoring the research of D. J. Glas and Mr. H. M. A. Pero for technical support during this project.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 6 • June 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Mar 21, 2019
Accepted: Nov 18, 2019
Published online: Mar 28, 2020
Published in print: Jun 1, 2020
Discussion open until: Aug 28, 2020
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