混凝土在海洋环境和除冰盐条件下的氯离子扩散行为  

Chloride Diffusion of Concretes Exposed to Marine Environment and Deicing Salt

作　　者：陈浩宇[1] 余红发[2] 刘连新[3] 翁智财[1] 蒋宏伟[1] 李美丹[1] 

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168 [2]南京航空航天大学土木工程系,江苏南京210016 [3]青海大学土木工程系,青海西宁810016

出　　处：《华中科技大学学报（城市科学版）》2005年第3期48-52,共5页Journal of Huazhong University of Science and Technology

基　　金：国家863计划资助项目(2002AA335020);国家自然科学基金资助项目(50178044);国家863计划西部新材料行动资助项目(2003AA33X100).

摘　　要：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100 d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.Concentration profiles of free chlorides in ordinary portland cement concrete （OPC） and high performance concrete （HPC）, which have been exposed to 3 different deicing salt and 3 varied ocean environments for 100 days, are determined by using chemical analysis method. Results show that chlorides diffusion in concrete dependes remarkably on the exposing environments. Concentration of free chlorides in concretes exposed to deicing salts is larger than that in the same 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 HPC. 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 than OPC.

关 键 词：普通混凝土(OPC) 高性能混凝土(HPC) 除冰盐 氯离子扩散 表观扩散系数 

分 类 号：TU528[建筑科学—建筑技术科学]