混凝土开裂部位氯离子渗透试验研究

Experimental Study of the Chloride Ion Penetration on the Crack Parts of Concrete

为研究混凝土裂缝宽度和深度对裂缝表面氯离子渗透的影响,制作了带裂缝的钢筋混凝土试件并进行了氯离子渗透研究.采用氯离子溶液浸泡时未开裂的试件、开裂试件的横断面进行研究.对于开裂的试件,通过对比裂缝的宽度、深度和裂缝表面氯离子渗透情况,并与未开裂试件断面氯离子渗透情况进行对比分析.研究结果表明,裂缝宽度对于裂缝表面氯离子渗透几乎没有影响,表面氯离子渗透主要与裂缝深度有关.对混凝土开裂部位的耐久性研究方法提出了新的观点,对混凝土结构耐久性的研究具有重要的参考价值.

For the study of the effect of chloride ion penetration on crack surface by crack width and depth,the reinforced concrete specimens with cracks were made and the chloride ion penetration experiments were carried out. The transverse sections of specimens without crack and cracking while soaked in Chlorine ion solution were used for experiments. For the cracking specimens,the analysis were carried through compared of the crack width,the crack depth and the chloride ion penetration of crack surface,and compared with the transverse section of specimens without crack. The research results show that,the crack width has negligible effect on surface chloride ion penetration of concrete cracks,surface chloride ion penetration was mainly related with the crack depth. The new viewpoint of concrete durability research on the cracking parts were put forward,which has important reference value for the study of the durability of concrete structures.