To study the mechnical properties of grout sleeve splicing of rebars after supplementary grouting under earthquake action,four large-diameter semi-grouting sleeve joint specimens with different initial grouting plumpness were fabricated,and two kinds of materials with different strengths were used for supplementary grouting.Experimental study on mechanical properties of joint specimens after supplementary grouting was carried out.The results show that residual deformation and tensile strength of grout sleeve splicing could meet the requirements of current standards.Due to the influence of residual grounting material on the inner wall of the sleeve and the surface of steel rebar,the residual deformation of the specimen after supplementary grouting is larger than that of the specimen with full initial grouting.After repeated tension and compression loading,the anchorage of grout to rebars was weakened which leads that part of the rebar was pulled out from sleeve in the tensile test.For the specimens with the same initial grouting fullness defects,the mechanical properties of the specimens repaired with higher strength supplementary grouting materials have not been significantly improved.
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万方数据
