Nonlinear fracture properties of concrete-concrete interfaces

Shah, Santosh G and Kishen, Chandra JM (2010) Nonlinear fracture properties of concrete-concrete interfaces. In: Mechanics of Materials, 42 (10). pp. 916-931.

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Abstract

The fracture properties of different concrete-concrete interfaces are determined using the Bazant's size effect model. The size effect on fracture properties are analyzed using the boundary effect model proposed by Wittmann and his co-workers. The interface properties at micro-level are analyzed through depth sensing micro-indentation and scanning electron microscopy. Geometrically similar beam specimens of different sizes having a transverse interface between two different strengths of concrete are tested under three-point bending in a closed loop servo-controlled machine with crack mouth opening displacement control. The fracture properties such as, fracture energy (G(f)), length of process zone (c(f)), brittleness number (beta), critical mode I stress intensity factor (K-ic), critical crack tip opening displacement CTODc (delta(c)), transitional ligament length to free boundary (a(j)), crack growth resistance curve and micro-hardness are determined. It is seen that the above fracture properties decrease as the difference between the compressive strength of concrete on either side of the interface increases. (C) 2010 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	Mechanics of Materials
Publisher:	Elsevier Science B.V.
Additional Information:	Copyright of this article belongs to Elsevier Science B.V.
Keywords:	Concrete interface; Size effect; Fracture properties; R-curve
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	13 Nov 2010 10:19
Last Modified:	13 Nov 2010 10:19
URI:	http://eprints.iisc.ac.in/id/eprint/33653

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