Study on interfacial bonding behavior between GFRP reinforcement and low alkali concrete in seawater environment
The time-varying law of interfacial bonding properties of GFRP bars in low alkali corrosion resistant cement matrix environ-ment was studied.The interfacial bonding strengths of GFRP bars slag sulphoaluminate cement concrete and GFRP bars Portland cement concrete cured for 30 days,90 days and 180 days in fresh water and artificial seawater environment were measured by central pull-out test.The microstructure deterioration process of GFRP reinforcement and the change rule of pH value of cement matrix pore solution after soaking in pore solution were analyzed by scanning electron microscope(SEM)and pH.The results show that the interfacial bond strength of GFRP reinforcement slag sulphoaluminate cement concrete increases with the increase of curing time in fresh water environment,but the bond strength of GFRP reinforcement Portland cement concrete decreases gradually.In seawater environment,the basicity of slag sulphoaluminate cement matrix is further reduced,and seawater can promote the development of its strength.The bond strength of GFRP reinforcement slag sulphoaluminate cement concrete in seawater increases faster than that in fresh water.
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