硫酸盐侵蚀下混凝土损伤演化的新模型
PDF下载 (392)鲍燕林,陈建康*.硫酸盐侵蚀下混凝土损伤演化的新模型[J].宁波大学学报(理工版),2016,29(1):98-102.DOI:
BAO Yan-lin,CHEN Jian-kang *.<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman"">A New Model of Damage Evolution in Concrete under Sulfate Attack[J].Journal of Ningbo University(Natural Science & Engineering Edition),2016,29(1):98-102.DOI:
| Title: | <span style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman"">A New Model of Damage Evolution in Concrete under Sulfate Attack |
| 作者: | 鲍燕林, 陈建康* |
| Author(s): | BAO Yan-lin, CHEN Jian-kang * |
| 关键词: | 硫酸盐侵蚀; 混凝土; 微裂纹成核; 损伤演化 |
| Keywords: | sulfate attack; concrete; micro-crack nucleation; damage evolution |
| 分类号: | TU528.31 |
| 文献标识码: | A |
| 摘要: | 根据混凝土的拉伸强度给出了微裂纹的起裂条件, 再由微裂纹成核率的“白模型”得到了损伤驱动应力相关的微裂纹成核率方程. 在假定微裂纹的长大服从Seaman扩展方程的基础上, 结合微裂纹数密度演化的平衡方程, 得到了特征线上微裂纹数密度演化的一阶常微分方程; 通过对微裂纹的体积积分, 得到了混凝土损伤劣化的新模型, 模型的相关参数则由实验确定. 研究结果表明: 得到的损伤劣化模型可以较好地反映混凝土侵蚀损伤演化规律. |
| Abstract: | Based on the tensile strength of the concrete, we provide a criterion for the micro-crack’s nucleation, We also derive the equation of micro-crack nucleation rate on the basis of Bai’s model,, which relates to the driving force of damage. Assuming that the micro-crack growth obeys Seaman extended equation, and combining with the equilibrium equation of the evolution of the micro-crack number density, we set uo the first-order ordinary differential equation of the micro-crack number density evolution for the characteristic curve. Per the volume integral of the micro-crack, the new model of the degradation of concrete damage has been built. The parameters of this model are determined by the experimental results. The results show that the damage degradation model obtained in this research can better reflect the evolution rule of concrete erosion damage |
| 参考文献 /References: | [1].ZHANG M H, CHEN J K, L? Y F, et al. Study on the expansion of concrete under attack of sulfate and sulfate- chloride ions[J]. Construction and Building Materials, 2013, 39:26–32. [2].HEKAL E E, KISHAR E, MOSTAFA H. Magnesium sulfate attack on hardened blended cement pastes under different circumstances[J]. Cement and Concrete Research, 2002, 32(9):1421-1427. [3].SAHMARAN M, ERDEM T K, YAMAN I O. Sulfate resistance of plain and blended cements exposed to wetting-drying and heating-cooling environments[J]. Construction and Building Materials, 2007, 21:1771- 1778. [4].PAULO J M M, KURTIS K E. Time to failure for concrete exposed to severe sulfate attack[J]. Cement and Concrete Research, 2003, 33:987-993. [5].YANG D Y, LUO J J. The damage of concrete under flexural loading and salt solution[J]. Construction and Building Materials, 2012, 36:129-134. [6].张景富, 王, 王宇,等. 油井水泥石的硫酸盐侵蚀[J].硅酸盐学报, 2011, 39(12):141-146. [7].MARCHAND J, SAMSON E, MALTAIS Y, . Theoretical analysis of the effect of weak sodium sulfate solutions on the durability of concrete[J]. Cement and Concrete Composites, 2002, 24(3/4):317-329. [8].SARKAR S, MAHADEVAN S, MEEUSSEN J C L, et al. Numerical simulation of cementitious materials degrada- tion under external sulfate attack[J]. Cement and Concrete Composites, 2010, 32(3):241-252. [9].CHEN J K, SONG H, ZHANG M H, et al. Theoretical analysis on the nucleation of micro-damage in cement mortar under compressive loading and sulfate attack[J]. Acta Mechanica Solida Sinica, 2013, 26(1): 53-61 [10].白以龙. 冲击载荷下材料的损伤和破坏[M]. 合肥: 中国科学技术大学出版社, 199234-57. [11].SEAMAN L, CURRAN D R, SHOCKEY D A. Computational models for ductile and brittle and fracture [J]. Journal of Applied Physics, 1976, 47:4814-4826. [12].黄筑平, 杨黎明, 潘客麟. 材料的动态损伤和失效[J]. 力学进展, 1993, 23(4):433-467. A New Model of Damage Evolution in Concrete under Sulfate Attack [13].BAO Yan-lin, CHEN Jian-kang* [14].( Faculty of Mechanical Engineering & Mechanics, Ninbo University, Ningbo 315211, China ) [15].Abstract: Based on the tensile strength of the concrete, we provide a criterion for the micro-crack’s nucleation, We also derive the equation of micro-crack nucleation rate on the basis of Bai’s model,, which relates to the driving force of damage. Assuming that the micro-crack growth obeys Seaman extended equation, and combining with the equilibrium equation of the evolution of the micro-crack number density, we set uo the first-order ordinary differential equation of the micro-crack number density evolution for the characteristic curve. Per the volume integral of the micro-crack, the new model of the degradation of concrete damage has been built. The parameters of this model are determined by the experimental results. The results show that the damage degradation model obtained in this research can better reflect the evolution rule of concrete erosion damage. |
| 备注/Memo: | 收稿日期: 2014?07?29. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 国家自然科学基金（ 51079069 ） ; 宁波市社发重点项目（ 2013C 51007 ） . 第一作者: 鲍燕林（1988－）, 男, 浙江温州人, 在读硕士研究生, 主要研究方向: 混凝土损伤力学. E-mail: 214368616@qq.com * 通信作者: 陈建康（ 1957 －） , 男 , 江苏宿迁人 , 教授 , 主要研究方向 : 混凝土损伤力学 . E-mail: chenjiankang1957@163.com 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
