关键词: 浸泡;暴露;混凝土;氯离子结合能力;相关性

Abstract: Concrete corrosion test under long term immersion and field exposure environment was done.The total and free chloride ion content of concrete sample was measured at different depth under different environment.With regression method, the concrete chloride binding capacity KR between diffusion depth or concrete compressive strength was analyzed.The results show that KR (correlation of concrete chloride binding capacity) decreased with the increasing of concrete compressive strength.The KR are much larger than 1.2 when the concrete compressive strength is less than 58.6 MPa and increased with the increasing of chloride diffusion depths, the value of KR is just 0.8 when the concrete compressive strength is 80.6 MPa and increased with the increasing of chloride diffusion depths.In order to predict the service life of field concrete structure more accutate, concrete binding capacity under immersion condition is converted into concrete binding capacity under field environment based on the equation RE=2.687e-0.0142fc+(0.0111-0.0002fc)xRI.

Key words: immersion;exposure;concrete;chloride ion binding capacity;correlation