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Journal of Adhesion, Vol.78, No.3, 203-221, 2002
Surface issues of profiled cementitious composites
The paper provides a topography analysis performed on samples of hardened cement paste, mortar and concrete profiled by grit blasting. Macro-topography (profile) is evaluated by three-dimensional co-ordinate measurements, and microtopography (roughness) is investigated via contact angle measurements. The topography of the generated surface depends on the properties of the matrix-aggregate-interface. The lower the bond, the rougher the surface. The micro-roughness of the aggregate surfaces increases due to grit blasting, but the adhesion properties, in terms of contact angle, do not necessarily improve. The contact angles depend on a balance between frictional force and capillary force and, therefore, are not a simple expression of the surface roughness.