持续荷载和锂渣取代量对混凝土抗氯离子渗透性能的影响

为考察受载锂渣混凝土抗氯离子渗透性能, 本文设计了锂渣取代水泥质量0％、10%、20%和30%的C20、C30和C40混凝土, 对混凝土试件施加极限压荷载的10%、30%和50%, 作为持续压应力, 进行氯离子渗透性能试验。结果表明: 水灰比范围在0.40~0.62时, 电通量随着水灰比的增大而增大; 对于施加不同压应力的混凝土, 当压应力比达到0.3时, C20和C30混凝土电通量有明显的提升, 当压应力比达到0.5时, C40混凝土电通量有明显的提升; 对于不同锂渣取代量的混凝土, 电通量随着锂渣取代量的增大而减小。结合 Fick第二定律和质量守恒定律, 建立在持续荷载作用下锂渣混凝土氯离子渗透模型, 结果表明, 氯离子在浸泡环境下的渗透性能符合试验规律, 模拟结果与试验结果一致。

Abstract

In order to investigate the chloride ion permeability resistance of lithium slag concrete under pressure circumstance, C20, C30 and C40 concrete with different content of lithium slag (0%, 10%, 20% and 30%, mass fraction) were designed in this paper. It applied 10%, 30% and 50% of the ultimate compressive load as continuous compressive stress to carry out the concrete chloride ion permeability tests. The results show that the electric flux increases with the increase of water-cement ratio when the water-cement ratio is in the range of 0.40 to 0.62. For the concrete with different stresses applied, the electric flux of C20 and C30 concrete increases significantly when the compressive stress ratio reaches 0.3, and the electric flux of C40 concrete increases significantly when the compressive stress ratio reaches 0.5. For the concrete with different lithium slag content, the electric flux decreases with the increase of lithium slag content. Taking Fick’s second law and the law of conservation of mass into consideration, the model of chloride ion permeability of lithium slag concrete was established under continuous load. The results show that the permeability of chloride ion in immersion environment is in accordance with the experimental law, and the simulation results are consistent with the experimental results as well.

参考文献

[1] 吴林键, 鞠学莉, 马原飞, 等. 钢筋对混凝土中氯离子扩散的阻挡效应预测模型［J］. 建筑材料学报, 2021, 24(2): 296-303+332.

[2] 康天蓓, 刘昱, 周静海, 等. 干湿循环下废弃纤维再生混凝土氯离子传输性能［J］. 建筑材料学报, 2022, 25(4): 389-394.

[3] 何世钦. 氯离子环境下钢筋混凝土构件耐久性能试验研究［D］. 大连: 大连理工大学, 2004.

[4] 陈志强, 邓春林, 朱海威. 工程混凝土氯离子扩散系数控制因素及设计应用研究［J］. 建筑结构, 2022, 52(s1): 1551-1556.

[5] 肖正华, 高洋洋. 碳达峰、碳中和目标下, 建筑业绿色技术创新提速［J］. 建筑监督检测与造价, 2021, 14(2): 45-46.

[6] 刘宇, 羊凌玉, 李欣蓓, 等. 碳中和目标实现下中国转型发展路径研究［J］. 北京理工大学学报(社会科学版), 2022, 24(4): 27-36.

[7] 逄锦伟. 冻融循环作用下锂渣混凝土抗硫酸盐侵蚀研究［J］. 硅酸盐通报, 2019, 38(1): 304-309.

[8] 杜修力, 金浏, 张仁波. 力学荷载对混凝土中氯离子渗透扩散行为影响述评［J］. 建筑结构学报, 2016, 37(1): 107-125.

[9] ZHANG J Z, BIAN F, ZHANG Y R, et al. Effect of pore structures on gas permeability and chloride diffusivity of concrete［J］. Construction and Building Materials, 2018, 163: 402-413.

[10] 马丽莎, 温勇, 马蕾. 持续压荷载作用对锂渣混凝土气体渗透性的影响［J］. 混凝土, 2020(1): 45-49.

[11] FAN J C, ZHU H G, SHI J, et al. Influence of slag content on the bond strength, chloride penetration resistance, and interface phase evolution of concrete repaired with alkali activated slag/fly ash［J］. Construction and Building Materials, 2020, 263: 120639.

[12] 张灵灵, 陆春华, 徐可, 等. 荷载裂缝和养护龄期对混凝土内氯离子传输影响研究［J］. 硅酸盐通报, 2020, 39(4): 1100-1106.

[13] 潘诗婷, 李凯, 张超慧, 等. 粗骨料形状对混凝土氯离子扩散性能影响的数值模拟研究［J］. 材料导报, 2022, 36(10): 89-97.

[14] 余韬, 郑春扬, 王子明, 等. 持续压应力作用下基于电通量法的混凝土渗透性研究［C］//中国建筑材料联合会混凝土外加剂分会第十四次会员代表大会论文集. 2014: 158-163.

[15] 邓雷, 温勇, 韩国旗, 等. 锂渣混凝土孔分形维数与气体渗透性能关系研究［J］. 混凝土, 2017(5): 68-71.

[16] 陈宣东, 韩建德, 王曙光, 等. 基于Comsol Multiphysics数值模拟荷载作用下掺加粉煤灰的混凝土中氯离子侵蚀的服役寿命［J］. 混凝土, 2016(8): 43-47+74.

[17] 李梅. 锂渣粉及粉煤灰对水泥基材料氯离子渗透性的影响研究［D］. 乌鲁木齐: 新疆大学, 2014.

[18] ISHIDA T, IQBAL P O, ANH H T L. Modeling of chloride diffusivity coupled with non-linear binding capacity in sound and cracked concrete［J］. Cement and Concrete Research, 2009, 39(10): 913-923.

[19] SHAFIKHANI M, CHIDIAC S E. A holistic model for cement paste and concrete chloride diffusion coefficient［J］. Cement and Concrete Research, 2020, 133: 106049.

[20] 冯乃谦, 邢锋. 高性能混凝土的氯离子渗透性和导电量［J］. 混凝土, 2001(11): 3-7.

李宇航, 温勇, 韩国旗, 郝恩泽, 刘佳, 马丽莎. 持续荷载和锂渣取代量对混凝土抗氯离子渗透性能的影响[J]. 硅酸盐通报, 2023, 42(2): 598. LI Yuhang, WEN Yong, HAN Guoqi, HAO Enze, LIU Jia, MA Lisha. Effects of Continuous Load and Lithium Slag Content on Chloride Ion Permeability Resistance of Concrete[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(2): 598.

持续荷载和锂渣取代量对混凝土抗氯离子渗透性能的影响

关于本站 Cookie 的使用提示

全站搜索

持续荷载和锂渣取代量对混凝土抗氯离子渗透性能的影响

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索