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文章以新旧桥连接处的修复混凝土为研究对象,利用室内振动台试验模拟新旧桥连接处混凝土在施工过程受到行车荷载引起的振动变形扰动,分析受到振动变形扰动后的连接处混凝土的强度、与钢筋的粘结性能、内部孔隙和微裂缝的变化情况。研究结果表明:振幅分别为1.5mm、3mm、5mm振动变形扰动以及现场测得的实测波产生的变形扰动对新旧桥连接混凝土的抗压强度、抗拉强度不会产生不利影响;振幅为3mm以上的振动变形扰动使得新旧桥连接混凝土与钢筋之间的握裹力出现较大幅度的下降。振动变形扰动改变了连接混凝土内部的孔隙分布,使得毛细孔数量减少,凝胶孔数量逐渐增加,孔结构得到细化。
In this paper, the repaired concrete at the junction of the old bridge and the old bridge is taken as the research object. The indoor vibration table test is used to simulate the vibration and deformation disturbance caused by the driving load during the construction of the concrete at the junction of the old bridge and the new bridge. The strength of the concrete subjected to vibration and disturbance is analyzed. Bond performance of steel bars, changes in internal porosity and microcracks. The results show that: the vibration amplitude of 1.5mm, 3mm, 5mm vibration and deformation measurements and the measured deformation of the measured wave generated on the new and old bridge concrete connected with the compressive strength, tensile strength will not adversely affect the amplitude of 3mm above The vibration and deformation disturbances make the bond between the new and old bridge concrete and the rebar appear more substantial decline. Vibration and deformation disturbances change the pore distribution inside the connecting concrete so that the number of pores decreases, the number of gel pores gradually increases, and the pore structure is refined.