不同面层体积分数下梯度结构混凝土的表面氯离子浓度  

Surface Chloride Concentration of Gradient Structure Concrete with Different Volume Fraction of Surface-Layer

作　　者：温小栋[1] 张瑜[1] 干伟忠[1] 谷伟[1] 宋炜波 

机构地区：[1]宁波工程学院宁波市混凝土结构耐久性重点实验室,浙江宁波315016 [2]余姚市人民医院,浙江余姚315400

出　　处：《建筑材料学报》2013年第6期1067-1071,共5页Journal of Building Materials

基　　金：浙江省公益技术研究分析测试项目(2012C37049);宁波市社会发展重大重点项目(2013C51004);宁波市交通运输委员会科技项目(201307)

摘　　要：通过室内氯离子侵蚀加速试验及氯离子分布测试,结合Fick第二定理拟合出梯度结构混凝土(GSC)的表面氯离子浓度,以研究面层体积分数、加速试验龄期对GSC表面氯离子浓度的影响.结果表明:GSC的表面氯离子浓度随面层体积分数的增加而下降,并逐渐趋于平缓;GSC表面氯离子浓度随暴露时间的延长而增加,最后趋于稳定;与面层体积分数φs=0的GSC试件相比,φs>0的试件具有更大的表征表面氯离子浓度累积速率的拟合系数r,但φs>0后,各GSC试件的r值相差不大.在现有模型的基础上,分别提出了GSC表面氯离子浓度与面层体积分数、加速试验龄期间的关系.Combined with the Fick＇s second law, the surface chloride concentration of gradtent structure concrete （GSC） were calculated for studying the effect of surface-layer volume fractions and accelerating period, by conduc- ting the chloride migration rapid test and determining the distribution of chloride. The results show that surface chloride concentration of the GSC is reduced with the increase of volume fractions of surface-layer, and finally rea- ches a stead state~ and the surface chloride concentration in GSC gradually grows along with the accelerating period increases, and also reaches a stead state finally. Compared with the specimens of 0% volume fractions of surface- layer, that with a higher volume fraction has a faster accumulation rate of chloride on the surface. But when the volume fraction of surface-layer exceeds 0%, the accumulation rate of the all specimens is almost equal. At last, the relationship among surface chloride concentration, surface layer volume fraction and accelerated period are put forward respectively hased on the existing model.

关 键 词：梯度结构 设计 加速试验 表面氯离子浓度 

分 类 号：TU528.01[建筑科学—建筑技术科学]