荷载与侵蚀维度对混凝土内氯离子传输规律的影响

钟小平; 许嘉豪; 刘洋; 夏晋; 朱炳喜; 张军; 倪克挺

doi:10.3724/j.gyjzG24022706

荷载与侵蚀维度对混凝土内氯离子传输规律的影响

doi: 10.3724/j.gyjzG24022706

1. 扬州大学建筑科学与工程学院, 江苏扬州 225127;
2. 浙江大学结构工程研究所, 杭州 310058;
3. 江苏省水利科学研究院, 江苏扬州 225002;
4. 浙大宁波理工学院, 浙江宁波 315100

基金项目:

江苏省水利科学研究院科技项目(2022Z034)。

国家自然科学基金项目(52178171, 51678513,52278278)

详细信息

作者简介:
钟小平,工学博士,教授,主要从事混凝土结构耐性及性能提升技术研究。电子信箱:zhongxiaoping@zju.edu.cn

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出版历程
- 收稿日期: 2024-02-27
- 网络出版日期: 2024-11-06

Effects of Loads and Erosion Dimensions on the Chloridion Transmission Rule in Concrete

1. College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China;
2. Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China;
3. Jiangsu Water Conservancy Science Research Institute, Yangzhou 225002, China;
4. School of Civil Engineering and Architecture, NingboTech University, Ningbo 315100, China

摘要

摘要: 为了研究荷载效应及侵蚀维度对混凝土中氯离子侵蚀特性的影响及其分析方法,对长期承受持续荷载的轴心受压、偏心受压及无应力构件进行一维及二维氯盐溶液干湿循环试验,分析不同荷载性质、不同侵蚀维度下自由氯离子含量的分布规律,结果表明:无应力状态下,相同侵蚀深度处,二维氯离子侵蚀浓度高于一维侵蚀浓度;轴向压荷载对氯离子的传输有抑制作用,在混凝土表层0~40 mm深度范围内,二维氯离子侵蚀浓度大于相同深度处一维侵蚀浓度,但小于无应力状态下一维侵蚀浓度;偏心拉应力对氯离子传输有加速作用,一维及二维侵蚀时,偏心受拉区氯离子的侵蚀程度均较偏心受压区严重;侵蚀面水平向上的区域侵蚀程度>倾斜面>向下的底面。将荷载效应对氯离子扩散性能的影响采用"等效表观氯离子扩散系数"来表征,并通过试验验证了其适用性;基于试验研究及理论分析,引入维度影响函数对Fick扩散模型进行修正,修正模型计算结果与实测二维氯离子侵蚀结果吻合较好,用修正模型来描述二维氯离子侵蚀特性是可行的。
- 混凝土 /
- 氯离子 /
- 侵蚀维度 /
- 压荷载 /
- 等效氯离子扩散系数
Abstract: To study the effects of load and erosion dimension on the characteristics of chloride ion erosion in concrete and its analysis method, dry-wet cycle experiments of chloride salt solution were carried out on components under continuous loads for a long time,including axially compressed, eccentrically compressed, and stress-free components, in both one-dimensional and two-dimensional manners. The distribution of free chloride ion content under different load properties and erosion dimensions was analyzed. The results showed that under a stress-free condition,the two-dimensional chloride ion erosion concentration at the same erosion depth was higher than that of one-dimensional erosion; axial compressive load had an inhibitory effect on the transmission of chloride ions, within the 0-40 mm depth range of the concrete surface, the two-dimensional chloride ion erosion concentration was greater than that at the same depth of one-dimensional erosion, but less than the one-dimensional erosion concentration under a stress-free condition; eccentric tensile stress accelerated the transmission of chloride ions, during both one-dimensional and two-dimensional erosion,the degree of chloride ion erosion in the eccentric tension zone was more severe than in the eccentric compression zone;in terms of erosion degree,the area above the horizontal plane of the erosion face > inclined plane > bottom face downwards. The influence of load effects on the diffusive properties of chloride ions was characterized by the "equivalent apparent chloride ion diffusion coefficient", and its applicability had been verified through experiments. Based on the experimental research and theoretical analysis, a dimension influence function was introduced to modify the Fick diffusion model. The modified model’s calculated results were in good agreement with the measured two-dimensional chloride ion erosion results, indicating that it was feasible to describe the characteristics of two-dimensional chloride ion erosion using the modified model.
- concrete /
- chloride ions /
- erosion dimension /
- compressive load /
- equivalent chloridion diffusion coefficient

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参考文献(28)

[1]	金伟良,赵羽习.混凝土结构耐久性[M].2版.北京:科学出版社,2014.
[2]	付传清,屠一军,金贤玉,等.荷载作用对混凝土中氯盐传输的影响研究进展[J].硅酸盐学报,2015,43(4):400-409.
[3]	WANG Y, ZHANG S, NIU D, et al. Effects of silica fume and blast furnace slag on the mechanical properties and chloride ion distribution of coral aggregate concrete[J]. Construction and Building Materials, 2019, 214: 648-658.
[4]	孙明,鲍麒,丁贵军,等.粉煤灰对混凝土碳化及氯离子侵蚀规律的影响[J].公路,2021,66(8):295-299.
[5]	童良玉,刘清风. 考虑多尺度非均质性的混凝土传输性能预测模型[J].建筑材料学报,2023,26(10):1062-1071.
[6]	蔡栋兴,毕文彦,管学茂. 粗骨料对混凝土氯离子扩散影响的模拟与试验[J].建筑材料学报,2023,26(4):383-388.
[7]	虞夏深.水灰比与掺合料对混凝土抗氯离子渗透性能的影响[J].大连大学学报,2017,38(6):47-49.
[8]	彭建新,王华,张建仁,等.氯盐侵蚀下钢筋混凝土氯离子扩散系数试验及其概率分析[J].中国公路学报,2014,27(6):77-83.
[9]	李永强,巴明芳,柳俊哲,等.干湿循环作用下水泥基复合材料抗氯离子侵蚀性能及其微观结构变化[J].复合材料学报,2017,34(12):2856-2865.
[10]	韩学强,詹树林,徐强,等.干湿循环作用对混凝土抗氯离子渗透侵蚀性能的影响[J].复合材料学报,2020,37(1):198-204.
[11]	DOUSTI A, RASHETNIA R, AHMADI B, et al. Influence of exposure temperature on chloride diffusion in concretes incorporating silica fume or natural zeolite[J]. Construction and Building Materials, 2013, 49: 393-399.
[12]	邹洪波,罗小勇.压应力作用下混凝土中氯离子侵蚀性能研究[J].中国公路学报,2017,30(4):87-96.
[13]	王海龙,张晓龙,俞秋佳,等.压荷载持续作用状态对混凝土中氯离子输运规律的影响[J].水利学报,2015,46(8):974-980.
[14]	李树国.轴压荷载作用下再生混凝土水分与氯离子传输性能研究[D].青岛:青岛理工大学,2021.
[15]	LIM C C, GOWRIPALAN N, SIRVUVATNANON V. Microcracking and chloride permeability of concrete under uniaxial compression[J]. Cement and Concrete Composites, 2000, 22(5): 353-360.
[16]	孙继成,姚燕,王玲,等.应力作用下混凝土的氯离子渗透性[J].低温建筑技术,2011,33(3):1-3.
[17]	WANG H L, DAI J G, SUN X Y, et al. Time-dependent and tress-dependent chloride diffusivity of concrete subjected to sustained compressive loading[J]. Journal of Materials in Civil Engineering, 2016, 28(8),04016059.
[18]	XU J, LI F M, ZHAO J, et al. Model of time-dependent andstress-dependent chloride penetration of concrete under sustained axial pressure in the marine environment[J].Construction and Building Materials, 2018, 170: 207-216.
[19]	陆春华,崔钊玮,张邵峰,等.粉煤灰对受弯开裂钢筋混凝土内氯离子侵蚀的影响[J].建筑材料学报,2013,16(5):787-793.
[20]	陆春华,刘荣桂,崔钊玮,等.干湿交替作用下受弯开裂钢筋混凝土梁内氯离子侵蚀特性[J].土木工程学报,2014,47(12):82-90.
[21]	孙玮琨,刘如泰,张俊芝,等.弯曲荷载对自然潮差环境下混凝土氯离子扩散性能影响的试验研究[J].工业建筑,2016,46(6):124-127 ,81.
[22]	WANG L C, WANG J Z. Mesoscale simulation of chloride diffusion in concrete subjected to flexural loading[J]. Advances in Structural Engineering, 2014, 17: 561-571.
[23]	李鹤,徐志鹏,吴桐.荷载作用下混凝土氯离子侵蚀试验研究[J].低温建筑技术,2021,43(5):41-46.
[24]	余红发,孙伟,麻海燕.混凝土氯离子扩散理论模型的研究Ⅰ:基于无限大体的非稳态齐次与非齐次扩散问题[J].南京航空航天大学学报,2009,41(2):276-280.
[25]	鞠学莉,吴林键,刘明维,等.考虑氯离子侵蚀维度的钢筋混凝土码头服役寿命预测[J].材料导报,2021,35(24):24075-24080 ,24087.
[26]	GJRV O E. Durability design of concrete structures in severe environments[M]. New York: Taylor & Francis, 2009.
[27]	张伟平,张庆章,顾祥林,等.环境条件和应力水平对混凝土中氯离子传输的影响[J].江苏大学学报,2013,34(1):101-106.
[28]	The European Union-Brite Eu Ram Ⅲ. General guide lines for durability design and redesign:BE95-1347[S].Bruxelles:Brite-Euram, Dura Crete, 2000.