不同面层体积分数下梯度结构混凝土的表面氯离子浓度

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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)的表面氣离子浓度,以研究面层体积分数、加速试验龄期对 GSC表面氣离子浓度的影响.结果
表明:GSC的表面氣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表面氣离子次度
随暴露时间的延长而增加,最后趋于稳定;与面层体积分数 0.一0的GSC试件相比,4.>0的试件具
有更大的表征表面氣离子浓度累积速率的拟合系数r,但 q >0后,各GSC试件的r值相差不大.在现
有模型的上分别提出了GSC泰事平波度与面层体积分数加速试男系
关键词：梯度结构；设计；加速试验；表面氯离子浓度
中图分类号：TU528.01
文献标志码：A
doi:10.3969/j.issn.1007-9629.2013.06.026
Surface Chloride Concentration of Gradient Structure Concrete with
Different Volume Fraction of Surface-Layer
WEN Xiao-dong1, ZHANG Yul, GAN Wei-zhongl, GU Wei', SONG Wei-bo
(1.Ningbo Key Laboratory for Concrete Structure Durability, Ningbo University of Technology, Ningbo 315016, China；
2. Yuyao City People's Hospital, Yuyao 315400, China)
Albtract, Combined with the Ficks seoond law.the surtachloride concentration of qradient structure concrete
（GSC）were calculated for studving the effect of surface laver volume fractions and accelerating Deriod, bv 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
laver, that with a higher volume fraction has a faster accumulation rate of chloride on the surface. But when the
volume fraction of surface laver exceeds o%.the accumulation rate of the all specirnens is almost equal. At last
the relationship among surface chloride concentration, surface layer volume fraction and accelerated period are put
forward respectively based on the existing model.
Key words：gradient structure；design；accelerated test；surface chloride concentration
滨海环境下混凝土结构耐久性问题主要为氯盐
有效而经济的防护措施[--].当前，国内外研究人
侵蚀引起的钢筋锈蚀,其主要原因是外界环境的氯
员[4-]依据功能梯度概念,提出了混凝土的梯度结构
离子通过保护层的孔隙和裂缝迁移到钢筋表面,引
设计理念,其中结构层和保护层采用不同的材料体
起钢筋脱钝及腐蚀，因此对保护层进行主动增强是
系来满足各自的功能，然后通过先进的工艺复合成