In-Plane Modes of Fracture and Effective Parameters of Self-Consolidating Concrete
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 8
Abstract
In this paper, Mode I and Mode II fracture energies of self-consolidating concrete (SCC) are examined. Two shapes of Mode II specimens are used, and the specimens are made from mixtures with three different water-to-cement (w/c) ratios. To determine the fracture energy, the size effect methodology is also considered. Results indicated a mixed-mode fracture for beam-type double-notched specimens under four-point loading. There is an evident size effect for the Mode II fracture that is pronounced for larger specimens. With the decrease in w/c ratio from 0.65 to 0.45, and thus increase in compressive strength from 26.44 to 53.5 MPa, the Mode II fracture energy increased by 47%. The brittleness number increased for specimens with higher compressive strength or larger size. The failure cracks propagate through the aggregates rather than the paste for lower w/c ratios. The Mode II fracture energy was on average 26 times the Mode I fracture energy, and this ratio grows by reducing the w/c ratio. Approximate empirical relations are proposed for Mode II fracture energy as well as the ratio of Mode II to Mode I fracture energy () in terms of the compressive strength. Mode II fracture energy takes a lower value for SCC compared with conventional concrete.
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Acknowledgments
The authors would like to express their gratitude to the academic members of the Faculty of Civil Engineering in Babol Noshirvani University of Technology of Iran who kindly examined the research and made useful comments and suggested valuable modifications.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 8 • August 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jul 13, 2018
Accepted: Mar 14, 2019
Published online: May 25, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 25, 2019
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