干湿交替下氯离子分布曲线中可能存在氯离子浓度峰。本文主要研究了不同水灰比对氯离子浓度峰的影响，以及适合这种氯离子分布曲线计算扩散参数的方法。实验结果显示，峰值氯离子浓度( Cmax )随水灰比呈双曲线关系增大，而浓度峰出现的位置与水灰比呈较好线性增长关系。此外，去掉氯离子增大阶段并以浓度峰出现的深度为零点拟合氯离子下降阶段的方法较为适合被应用于出现浓度峰的氯离子分布曲线中来获得扩散参数。
A chloride concentration peak is prone to occur in the chlorideprofiles of concrete subjected to dying-wetting cycles. This research mainly investigated the influence of different water cement ratios ( W/C) on the occurring of chloride concentration peak. Besides, the appropriate calculating method of diffusion parameters was proposed for such chloride profiles with a concentration peak. The experimental results indicate that the peak value of chloride content (Cmax) presents a hysteric relation with increasing W/C, while the position where Cmax appears increased linearly with increasing W/C. Furthermore, the method of excluding the chloride content increasing part and starting from the position where Cmax appears to fit the chloride content phase is the proper way to obtain diffusion parameters of chloride profiles with a concentration peak. In addition, the method, excluding the increased content of chloride ions before the peak value and setting the exposure distance respective to the peak value as the zero point, was applied to obtain diffusion coefficient of chloride profile.
参考文献
| [1] | Byung Hwan Oh;Seung Yup Jang.Effects of material and environmental parameters on chloride penetration profiles in concrete structures[J].Cement and Concrete Research,20071(1):47-53. |
| [2] | Erik P. Nielsen;Mette R. Geiker.Chloride diffusion in partially saturated cementitious material[J].Cement and Concrete Research,20031(1):133-138. |
| [3] | Rob B. Polder;Willy H.A. Peelen.Characterisation of chloride transport and reinforcement corrosion in concrete under cyclic wetting and drying by electrical resistivity[J].Cement & concrete composites,20025(5):427-435. |
| [4] | Amor Ben Fraj;Stephanie Bonnet;Abdelhafid Khelidj.New approach for coupled chloride/moisture transport in non-saturated concrete with and without slag[J].Construction and Building Materials,2012:761-771. |
| [5] | H. Kuosa;R.M. Ferreira;E. Holt.Effect of coupled deterioration by freeze-thaw, carbonation and chlorides on concrete service life[J].Cement & concrete composites,2014:32-40. |
| [6] | Yu, Zhiwu;Chen, Ying;Liu, Peng;Wang, Weilun.Accelerated simulation of chloride ingress into concrete under drying-wetting alternation condition chloride environment[J].Construction and Building Materials,2015Sep.15(Sep.15):205-213. |
| [7] | 范宏;赵铁军;田砾;徐红波.暴露26年后的混凝土的碳化和氯离子分布[J].工业建筑,2006(8):50-53,44. |
| [8] | 黄俊;张俊芝;吴灵杰;金汉阳.干湿循环条件下混凝土氯离子侵蚀的模拟试验及相似性[J].混凝土,2012(12):4-5,8. |
| [9] | 徐港;徐可;苏义彪;王谊敏.不同干湿制度下氯离子在混凝土中的传输特性[J].建筑材料学报,2014(1):54-59. |
| [10] | 王传坤;高祥杰;赵羽习;金伟良;徐巧玲.混凝土表层氯离子含量峰值分布和对流区深度[J].硅酸盐通报,2010(2):262-267. |
| [11] | 余红发 .盐湖地区高性能混凝土的耐久性、机理与使用寿命预测方法[D].东南大学,2004. |
| [12] | 张俊芝;王建泽;孔德玉;邹传仁;黄海珍.水工混凝土氯离子侵蚀及扩散系数的随机模型[J].人民长江,2008(11):105-108. |
| [13] | 刘荣桂;陆春华.海工预应力混凝土氯离子侵蚀模型及耐久性[J].江苏大学学报（自然科学版）,2005(6):525-528. |
| [14] | Andrade, C.;Climent, M. A.;de Vera, G..Procedure for calculating the chloride diffusion coefficient and surface concentration from a profile having a maximum beyond the concrete surface[J].Materials and structures,20154(4):863-869. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%