粉煤灰对混凝土表面氯离子浓度的影响  

Influence of Fly Ash on Surface Chloride Concentrate of Concrete

作　　者：江大虎[1] 张云清[1] 余红发[1] 胡蝶 

机构地区：[1]南京航空航天大学土木工程系,江苏南京210016 [2]南京联勘科技有限公司,江苏南京210019

出　　处：《华中科技大学学报（城市科学版）》2010年第4期17-20,共4页Journal of Huazhong University of Science and Technology

基　　金：国家重点基础研究发展计划(973计划)(2009CB623203);江苏省自然科学基金前期预研项目(BK20052);南京航空航天大学博士生创新基金资助项目(BCXJ07-04)

摘　　要：用自然扩散法测定了混凝土中的自由氯离子浓度,计算了普通混凝土(Ordinary Portland concrete,OPC)和粉煤灰混凝土(Fly ash concrete,FAC)表面氯离子的浓度值,研究了暴露于海水前的养护龄期、暴露时间、粉煤灰(Fly ash,FA)掺量对混凝土表面氯离子浓度的影响。结果表明:在海水环境中,混凝土的表面氯离子浓度均随着暴露于海水前的养护龄期的延长而减小,随着暴露时间的延长而增加。FAC的表面氯离子浓度基本上随着FA掺量的增加不断减小。因此,对于实际海洋环境下的混凝土结构,在保证结构强度的前提下应尽量增加FA的掺量,同时延长潮湿养护的时间,有利于提高结构的服役寿命。The free chloride face chloride concentrates of The influences of curing age, ion contents of concrete were determined by a natural diffusion method. The surordinary portland concrete （OPC） and fly ash concrete （FAC） were calculated. exposed time and content of fly ash （FA） on surface chloride concentrate were discussed. The results showed that：In marine environment, the surface chloride concentrate of concrete decreases with the passage of curing age. However, that increases with the passage of exposure time. The surface chloride concentrate of FAC decreases continuously with the increase of the FA content. Therefore, in terms of concrete structures under the actual marine environment, we should increase FA content based on the safety strength of structures and prolong wet curing age at the same time, which will enhance the lifetime of these structures.

关 键 词：混凝土 粉煤灰 氯离子扩散 表面氯离子浓度 

分 类 号：TU528.01[建筑科学—建筑技术科学]