Effect of Water-Curing Time on the Mechanical Properties of Engineered Cementitious Composites
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 11
Abstract
The influence of initial water-curing time on the mechanical properties of engineered cementitious composites (ECCs) was investigated by employing a four-point bending test, compressive strength, and flexural strength. Five different curing regimes were applied to the specimens, which were in continuous room-air storage, curing in the laboratory room air after submersion in water for 3, 7, 14, and 28 days, respectively. The experimental results show that the deflection and the toughness index of ECC under water-curing conditions decrease gradually as water-curing time is prolonged. First cracking load, peak load, compressive strength, and flexural strength increase as water-curing time increases and total curing age is extended. The higher volume of fly ash is beneficial in lowering the adverse effect of water-curing time on the mechanical properties of ECCs. The cement of ECCs replaced by 80% fly ash by weight exhibited good ductility and mechanical properties whenwater curing time was 7 days. Otherwise, it was found that moisture content of had a certain influence on the ECC specimen’s deflection-load curve. Therefore, water-curing regimes are key factors for achieving robust strain hardening and multiple cracking behaviors in ECCs.
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Acknowledgments
Support from the Doctoral Foundation of Henan Polytechnic University (B2014-013) of China and financial help from the Henan Provincial Open Laboratory for Mineral Materials Key Disciplines (MEM14-19) of China, the National High Technology Research and Development Program 863 of China (2015AA034701), the Key Scientific Research Project of University in Henan Province (15A430008), and the Fundamental Research Funds for the Universities of Henan Province (NSFRF140109 and NSFRF140601) are gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 11 • November 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jun 10, 2015
Accepted: Mar 1, 2016
Published online: Jun 2, 2016
Published in print: Nov 1, 2016
Discussion open until: Nov 2, 2016
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