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3016153 
Journal Article 
Friction and cohesion coefficients of composite concrete-to-concrete bond 
Mohamad, ME; Ibrahim, IS; Abdullah, R; Abd Rahman, AB; Kueh, ABH; Usman, J 
2015 
Yes 
Cement and Concrete Composites
ISSN: 0958-9465 
56 
1-14 
WOS:000348628000001 
Experimental study is conducted to quantitatively assess the effects of different surface textures on the friction and cohesion coefficients of concrete-to-concrete bond under different normal stresses. The top surface of concrete base specimens are treated with five different surface textures; surface "left as-cast", deep groove, indented, and wire-brushing in longitudinal and transverse directions. The roughness profile of the treated concrete base is measured using a portable stylus roughness instrument. In addition, the "push-off" test method is conducted to determine the relationship between the roughness profile and the interface shear strength. Results show that the mean peak height, R-pm has the most significant influence on the pre-crack interface shear strength where the correlation coefficients, R-2 ranged from 0.9009 to 0.9209. Analytical equations are then proposed to predict the friction and cohesion coefficients by integrating R-pm into the proposed equations. The comparison shows a good concordance with the experimental results within an acceptable range. (C) 2014 Elsevier Ltd. All rights reserved. 
Interface shear strength; Surface roughness; Roughness parameter; Friction and cohesion coefficients