Experimental study on bonding behavior of FRP grids-ECC composite layer and concrete with quantitative interface treatment
In view of the issue that the quality of interface treatment of RC structures reinforced by traditional FRP grids-ECC composite layer cannot be guaranteed,an improved FRP grids-ECC composite reinforcement method of drilling holes in the concrete surface was proposed to quantify the interface roughness,and the roughness evaluation index called the interface treatment rate was established in this method.To reveal the bonding behavior between composite layer and concrete under different interface treatment rates,the tensile tests of the composite layer were carried out first.Then,4 groups of 12 double-shear specimens were tested to investigate the effects of different interface treatment rates on the shear properties of the composite layer and concrete.The results show that the tensile stress-strain curve of the composite layer is bilinear,the tensile strength is 10.62 MPa,and the ultimate tensile strain is 0.0138.The interface peeling failure occurred in specimens without interface treatment.For the specimens with interface treatment,the failure mode gradually transited from the critical fracture failure to the composite layer fracture failure with the increase of the interface treatment rate,that is,the improved reinforcement method of quantitative interface treatment can inhibit the interface peeling and control the interface failure mode to a certain extent.Based on the overall mechanical behavior of the composite layer and the interface treatment rate,the bonding slip model and the bearing capacity formula were established,and the bearing capacity calculated value is well matched with the test value,with an average value of 1.107.
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