Experimental Research for Flexibility Properties of RC Beams Strengthened with Steel Wire-Polymer Mortar

This paper presents the results of the experimental investigation on the flexural performance of beams strengthened with steel wire-polymer mortar. A total of five rectangular doubly RC beams were constructed and tested to failure. The test variables were numbers of reinforcement layers and configuration. A new accurate method to measure elongation of steel wire was proposed. Then the interfacial bond strength between concrete and polymer mortar was tested. The failures of the specimens were all bending failures and polymer mortar layer debonded from beam was not occurred. Only a few wires were pulled off in failure. The polymer mortar and concrete has a better bonding effect. Steel wires play the more effective tensile roles of themselves. After strengthened, the RC beams improve their bending bearing capacity and bending stiffness, delay the cracks occur and crack development.