Influence of the roughness of aggregate surface on the interface bond strength

Rao, Appa G and Prasad, Raghu BK (2002) Influence of the roughness of aggregate surface on the interface bond strength. In: Cement and Concrete Research, 32 (2). pp. 253-257.

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Abstract

An experimental investigation on the bond strength of the interface between mortar and aggregate is reported. Composite compact specimens were used for applying Mode I and Mode 11 loading effects. The influence of the type of mortar and type of aggregate and its roughness on the bond strength of the interface has been studied. It has been observed that the bond strength of the interface in tension is significantly low, though the mortars exhibited higher strength. The highest tensile bond strength values have been observed with rough concrete surface with M-13 mortar. The bond strength of the interface in Mode I load depends on the type of aggregate surface and its roughness, and the type of mortar, The bond strength of the interface between mortar M-13 cast against rough concrete in direct tension seems to be about one third of the strength of the mortar. However, it is about 1/20th to 1/10th with the mortar M-12 in sandwiched composite specimens. The bond strength of the interface in shear (Mode IT) significantly increases as the roughness and the phase angle of the aggregate surface increase. The strength of mortar on the interface bond strength has been very significant. The sandwiched composite specimens show relatively low bond strength in Mode I loading. The behavior of the interface in both Mode I and Mode 11 loading effects has been brittle, indicating catastrophic failure. (C) 2002 Elsevier Science Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	Cement and Concrete Research
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Aggregate;Bond strength;Interface;Mortar;Surface roughness
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	19 Jul 2011 10:16
Last Modified:	19 Jul 2011 10:16
URI:	http://eprints.iisc.ac.in/id/eprint/39250

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