Effect of temperature on the rupture of systems for the reinforcement of concrete

• Author(s): Aguiar, J. L. Barroso de ; Pimenta, T. J. ; Araújo, Marcelo Marinho de
• Date: 2004
• Persistent ID: http://hdl.handle.net/1822/3044
• Origin: RepositóriUM - Universidade do Minho
• Document Type: Conference Object
• Language: English

Description

The adhesives used in systems for the external reinforcement of concrete are epoxies. Like all the polymers, they have low thermal resistance. This paper presents the results of an experimental work made with specimens of hydraulic mortar reinforced on the exterior with steel or CFRP plates. The specimens were exposed seven days, to temperatures between 20 and 250 ºC. To determine the adhesion, we used flexure tests. The results of the tests show a decrease of the adhesion strength with temperature. The failures change to adhesive failures above 150 ºC and 200 ºC, for the reinforcement with steel plates and for the reinforcement with CFRP plates, respectively. Even maintaining the mortar failures, the efficiency of the reinforcements decreases significantly above 50 ºC. This temperature can be considerer as the thermal resistance of the two tested reinforcements.