混凝土在海洋环境和除冰盐条件下的氯离子扩散行为

采用化学分析方法测定了普通混凝土（OPC）和高性能混凝土（HPC）在3种除冰盐条件和3种海洋区域暴露100d后的自由氯离子浓度分布．结果表明：氯盐暴露环境对混凝土的氯离子扩散行为具有显著的影响．在相同扩散深度时，混凝土内部自由氯离子浓度的大小顺序是除冰盐环境〉海洋环境．OPC〉HPC．混凝土表观氯离子扩散系数的规律是OPC〉HPC．进一步的研究指出．除冰盐环境比海洋环境更恶劣．HPC比OPC更适应恶劣的氯盐环境。

Chloride Diffusion of Concretes Exposed to Marine Environment and Deicing Salt

Concentration profiles of free chlorides in ordinary portland cement c oncrete (OPC) and high performance concrete (HPC), which have been exposed to 3 diffe rent deicing salt and 3 varied ocean environments for 100 days, are determined b y using chemical analysis method. Results show that chlorides diffusion in con crete dependes remarkably on the exposing environments. Concentration of fre e chlorides in concretes exposed to deicing salts is larger than that in the sam e depth of concretes that exposed to ocean environments. When compared with the same conditions, concentration of free chlorides in OPC is larger than that in H PC. The apparent chloride diffusion coefficient of OPC is lager than that of HPC . Further researches show that deicing salts are severer to concretes than ocean environments, and HPC is more applicable to chloride attacking environments tha n OPC.