[1]肖建庄,卢登,马志鸣.考虑再生粗骨料随机分布的混凝土氯离子扩散细观数值模拟[J].东南大学学报(自然科学版),2014,44(6):1240-1245.[doi:10.3969/j.issn.1001-0505.2014.06.026]
 Xiao Jianzhuang,Lu Deng,Ma Zhiming.Mesoscopic numerical simulation on chloride diffusion in concrete with random distributed recycled coarse aggregate[J].Journal of Southeast University (Natural Science Edition),2014,44(6):1240-1245.[doi:10.3969/j.issn.1001-0505.2014.06.026]
点击复制

考虑再生粗骨料随机分布的混凝土氯离子扩散细观数值模拟()
分享到:

《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
44
期数:
2014年第6期
页码:
1240-1245
栏目:
土木工程
出版日期:
2014-11-20

文章信息/Info

Title:
Mesoscopic numerical simulation on chloride diffusion in concrete with random distributed recycled coarse aggregate
作者:
肖建庄卢登马志鸣
同济大学土木工程学院, 上海 200092
Author(s):
Xiao Jianzhuang Lu Deng Ma Zhiming
College of Civil Engineering, Tongji University, Shanghai 200092, China
关键词:
再生混凝土 再生粗骨料 随机分布 氯离子扩散 细观数值模拟
Keywords:
recycled aggregate concrete(RAC) recycled coarse aggregate(RCA) random distribution chloride diffusion mesoscopic numerical simulation
分类号:
TU391
DOI:
10.3969/j.issn.1001-0505.2014.06.026
摘要:
考虑粗骨料分布的随机性及氯离子结合的非线性对氯离子扩散性的影响,对再生混凝土中氯离子扩散进行数值建模与细观仿真分析,并将数值模拟结果与已有试验数据进行对比;通过改变老硬化砂浆扩散系数、新硬化砂浆扩散系数、老界面过渡区扩散系数及浸泡时间,对比研究了不同情况下再生混凝土中氯离子的扩散特性.结果表明:数值模拟结果与试验结果接近;再生混凝土中氯离子沿扩散深度方向呈波浪式下降;随着扩散系数的增大及浸泡时间的增长,氯离子扩散速度加快;随着再生粗骨料取代率的增加,氯离子扩散速度也增加;相同扩散深度处,不同随机骨料模型中氯离子含量最大值接近,说明所采用的随机骨料模型模拟结果具有较好的稳定性.
Abstract:
Concerning the effects of the random distribution of coarse aggregate and the non-linear characteristic of chloride binding on chloride diffusion, the modeling and microscopic simulation analysis for the chloride diffusion characteristics of recycled aggregate concrete(RAC)are carried out. The simulation results are compared with the test results. Then, the chloride diffusion characteristics with different diffusion coefficients of old mortar, new mortar and old interfacial transition zone(ITZ)and different immersion times are studied. The results indicate that the simulation results and the test results are similar. The distribution of chloride diffusion in RAC declines wavily along the diffusion depth. The chloride diffusion speed accelerates with the increase of the diffusion coefficients and the immersion time. Besides, with the increase of the replacement percentage of recycled coarse aggregate(RCA), the chloride diffusion speed of RAC increases. At the same diffusion depth, the maximum chloride concentrations in different random RAC models are similar, indicating that the simulation results of the proposed random RAC model has a good stability.

参考文献/References:

[1] Kou S C, Poon C S, Chan D. Influence of fly ash as cement replacement on the properties of recycled aggregate concrete[J]. Journal of Materials in Civil Engineering, 2007, 19(9): 709-717.
[2] Zeng Y W. Modeling of chloride diffusion in hetero-structured concretes by finite element method[J]. Cement and Concrete Composites, 2007, 29(7): 559-565.
[3] Zheng J J, Zhou X Z. Three-phase composite sphere model for the prediction of chloride diffusivity of concrete[J]. Journal of Materials in Civil Engineering, 2008, 20(3): 205-211.
[4] Sun G W, Zhang Y S, Sun W,et al. Multi-scale prediction of the effective chloride diffusion coefficient of concrete[J]. Construction and Building Materials, 2011, 25(10): 3820-3831.
[5] 应敬伟,肖建庄. 模型再生混凝土氯离子非线性扩散细观仿真[J]. 建筑材料学报,2013,16(5):867-872.
  Ying Jingwei, Xiao Jianzhuang. Meso-level simulation of chloride nonlinear diffusion in modeled recycled aggregate concrete[J].Journal of Building Materials, 2013,16(5):867-872.(in Chinese)
[6] Iqbal P O N, Ishida T. Modeling of chloride transport coupled with enhanced moisture conductivity in concrete exposed to marine environment [J]. Cement and Concrete Research, 2009, 39(4):329-339.
[7] 张庆章. 海水潮汐区混凝土氯盐侵蚀加速试验的相似性研究[D]. 上海:同济大学土木工程学院,2012.
[8] Xiao J Z, Ying J W, Shen L M. FEM simulation of chloride diffusion in modeled recycled aggregate concrete[J]. Construction and Building Materials, 2012, 29: 12-23.
[9] Xiao J Z, Li W G, Sun Z H, et al. Properties of interfacial transition zones in recycled aggregate concrete tested by nanoindentation[J]. Cement and Concrete Composites, 2013, 37: 276-292.
[10] Walraven J C. Aggregate interlock: a theoretical and experimental analysis[D]. Delft, Netherlands:Delft University of Technology, 1980.
[11] Hsu T T C. Mathematical analysis of shrinkage stresses in a model of hardened concrete[J]. ACI Journal Proceedings, 1963, 60(3): 371-390.
[12] 应敬伟. 再生混凝土氯离子扩散规律与基本特征[D]. 上海:同济大学土木工程学院,2013.
[13] 赵良颖, 郑建军. 二维骨料密度分布的边界效应[J]. 四川建筑科学研究, 2002, 28(2): 57-60.
  Zhao Liangying, Zheng Jianjun.Wall effect on the two-dimensional aggregate density distribution[J]. Building Science Research of Sichuan, 2002, 28(2):57-60.(in Chinese)

相似文献/References:

[1]彭有开,吴徽,高全臣.再生混凝土长柱的抗震性能试验研究[J].东南大学学报(自然科学版),2013,43(3):576.[doi:10.3969/j.issn.1001-0505.2013.03.024]
 Peng Youkai,Wu Hui,Gao Quanchen.Experimental study on seismic behavior of recycled concrete slender columns[J].Journal of Southeast University (Natural Science Edition),2013,43(6):576.[doi:10.3969/j.issn.1001-0505.2013.03.024]
[2]肖建庄,丁陶,王长青,等.现浇与预制再生混凝土框架结构抗震性能对比分析[J].东南大学学报(自然科学版),2014,44(1):194.[doi:10.3969/j.issn.1001-0505.2014.01.035]
 Xiao Jianzhuang,Ding Tao,Wang Changqing,et al.Contrastive analysis on seismic performances between cast-in-situ and precast frame structure made of recycled aggregate concrete[J].Journal of Southeast University (Natural Science Edition),2014,44(6):194.[doi:10.3969/j.issn.1001-0505.2014.01.035]
[3]肖建庄,黎骜,丁陶.再生混凝土生命周期CO2排放评价[J].东南大学学报(自然科学版),2016,46(5):1088.[doi:10.3969/j.issn.1001-0505.2016.05.032]
 Xiao Jianzhuang,Li Ao,Ding Tao.Life cycle assessment on CO2 emission for recycled aggregate concrete[J].Journal of Southeast University (Natural Science Edition),2016,46(6):1088.[doi:10.3969/j.issn.1001-0505.2016.05.032]
[4]李龙,等.再生混凝土力学性能的应变率敏感性数值模拟[J].东南大学学报(自然科学版),2017,47(4):776.[doi:10.3969/j.issn.1001-0505.2017.04.023]
 Li Long,Xiao Jianzhuang,Huang Kaiwen.Numerical simulation on strain-rate sensitivity of mechanical properties of recycled aggregate concrete[J].Journal of Southeast University (Natural Science Edition),2017,47(6):776.[doi:10.3969/j.issn.1001-0505.2017.04.023]

备注/Memo

备注/Memo:
收稿日期: 2014-05-15.
作者简介: 肖建庄(1968—),男,博士,教授,博士生导师,jzx@tongji.edu.cn.
基金项目: 国家自然科学基金资助项目(51325802).
引用本文: 肖建庄,卢登,马志鸣.考虑再生粗骨料随机分布的混凝土氯离子扩散细观数值模拟[J].东南大学学报:自然科学版,2014,44(6):1240-1245. [doi:10.3969/j.issn.1001-0505.2014.06.026]
更新日期/Last Update: 2014-11-20