Surface Properties of Concrete and Bonding Strength of Pine Resin-Based Adhesives to Concrete Surfaces

This article reports a quantitative investigation of the surface characteristics of normal concrete manufactured with different types of formworks and bonding strength between pine resin-based adhesives and concrete surfaces. Three types of formworks and adhesives with different ratios of pine resin to wax were prepared. Scanning electron microscopy, energy-dispersiveX-ray spectroscopy, white-light scanning interferometry, and electrophoretic light scattering were utilized for the surface characterization of concrete, and a bonding test was performed. Test results showed that the surface roughness of concrete was significantly influenced by the type of formwork; all techniques including visual observation provided similar results. On the contrary, chemical compositions and electrical characteristics were not influenced by the type of formwork. Bonding test results showed that bonding strength increased as the ratio of wax increased and the degree of the concrete surface roughness increased. The results of this study indicate the feasibility of pine resin-based adhesives for concrete structures as green construction materials.

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