Correlation between concrete-to-concrete bond strength and the roughness of the substrate surface

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Friction and cohesion coefficients of composite concrete-to-concrete bond (2015, methodology): “Studies [4–9] on the quantification of the degree of surface roughness and its correlation with the bond strength between concrete layers cast at different times have been carried out by several researchers.”
Near-to-Surface properties affecting bond strength in concrete repair (2014, methodology): “Roughness Many approaches are valuable to quantify surface ro ughness [6,16,18].”