Experimental Study of Bond Strength of Anchorage Adhesive After Heating

Abstract:

To satisfy the safety properties of the organic anchorage adhesive used in engineering field after heating from elevated temperatures, a series of pullout tests for three anchorage adhesives were conducted after heating at temperatures of 25, 60, 100, 160 and 260 °C. The glass transition temperatures of three adhesives were tested. The heating process was found to follow a fixed curve. Three commonly used anchorage adhesives were adopted. The forceslip relationships of the adhesives after heating, the ultimate strengths and their change regulation with the temperature were obtained. A threestage or fourstage model for the forceslip relationship was obtained by curvefitting. The results show that the bond strength of anchorage adhesive is strongly dependent on temperature, and the rigid and heat tolerance of thermoplastic adhesive is weak than thermosetting adhesive. The results also show that glass transition temperature is the turning point for behaviors of adhesive after heating, which can be used to determine the upper limit temperature for continuous application.

Key words:anchorage adhesive; after heating; bond strength; residual bearing capacity