Study on pore structure and permeability of basalt fiber reinforced concrete under confining pressure

doi:10.19936/j.cnki.2096-8000.20230128.011

Abstract

Abstract: The pore structure, mechanical properties and impermeability of concrete with different basalt fiber contents under confining pressure were studied based on experiments. The uniaxial compression and splitting tests of basalt fiber concrete with 0 %, 0.05 %, 0.1 %, 0.2 % and 0.3 % fiber content were carried out by uniaxial compression machine. The triaxial compression and permeability tests under different confining pressures (4 MPa, 5 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa and 10 MPa) were carried out by TAW-2000 servo triaxial testing machine. Combined with automatic rapid specific surface area and porosity analyzer and scanning electron microscope (SEM), the internal pore changes and micro-structure of the specimens were obtained. The influence of basalt fiber on the strength, toughness, pore structure and impermeability of concrete specimens was analyzed. The results show that the incorporation of basalt fiber can greatly improve the mechanical properties and ductility of concrete specimens, and the compressive and tensile strengths of specimens are the highest at 0.05% of fiber incorporation, and the toughness of specimens is the best at 0.1% of fiber incorporation, but excessive fiber incorporation will reduce the ability of specimens to resist external load. Besides, the incorporation of fiber can reduce the pore diameter and porosity of the specimen, forming a good bonding effect between fiber and concrete material and eventually form a spatial mesh structure inside the specimen to enhance the integrity and reduce the generation and expansion of cracks. Under different confining pressures, the permeability of basalt fiber concrete is always smaller than that of plain concrete, the incorporation of fibers reduces the porosity of concrete materials and improves the permeability resistance, and the increase of the confining pressure makes the permeability of both kind of concrete specimens decrease continuously until it is in a stable state while the permeability of basalt fiber concrete specimens decreases more gently.

Key words: basalt fiber, peak stress, toughness, porosity, permeability, microstructure, composites

CLC Number:

TB332

HU Xiuyue, PANG Jianyong, LEI Chengxiang. Study on pore structure and permeability of basalt fiber reinforced concrete under confining pressure[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(1): 94-99.

References

[1] 何满潮, 谢和平, 彭苏萍, 等. 深部开采岩体力学研究[J]. 岩石力学与工程学报, 2005(16): 2803-2813.
[2] 刘娟红, 周昱程, 纪洪广. 单轴加卸载作用下井壁混凝土能量演化机理[J]. 煤炭学报, 2018, 43(12): 3364-3370.
[3] 谢京辉, 彭刚, 陈灯红, 等. 不同初始孔隙水压力下混凝土动态力学特性[J]. 水利水运工程学报, 2017(3): 99-106.
[4] 彭竹君, 肖洋, 乔宗耀, 等. 循环孔隙水压力作用对混凝土损伤特性研究[J]. 水利水电技术, 2018, 49(12): 203-207.
[5] 罗曦, 彭刚, 柳琪, 等. 循环孔隙水压下混凝土的力学特性和损伤演化[J]. 长江科学院院报, 2018, 35(2): 129-134.
[6] 闫东明, 林皋. 不同初始静态荷载下混凝土动态抗压特性试验研究[J]. 水利学报, 2006(3): 360-364.
[7] YAMAN I O, HEARN N, AKTAN H M. Active and non-active porosity in concrete Part Ⅰ: Experimental evidence[J]. Materials and Structures, 2002, 35(2): 102-109.
[8] 郝亚琳, 谭维佳, 郭培玺. 基于多种纤维的超高强度纤维增强混凝土基本性质研究[J]. 混凝土, 2021(8): 14-19.
[9] 林家富. 基于SEM的玄武岩纤维混凝土力学性能及微观结构研究[J]. 施工技术, 2018, 47(18): 97-101.
[10] 高真, 曹鹏, 孙新建, 等. 玄武岩纤维混凝土抗压强度分析与微观表征[J]. 水力发电学报, 2018, 37(8): 111-120.
[11] 解国梁, 申向东, 刘金云, 等. 短切玄武岩纤维对混凝土抗氯离子侵蚀性能的影响[J]. 复合材料科学与工程, 2020(12): 10-14.
[12] 尹玉龙. 玄武岩纤维混凝土的力学性能和耐久性能研究[D]. 重庆: 重庆交通大学, 2015.
[13] 高真, 曹鹏, 孙新建, 等. 玄武岩纤维混凝土抗压强度分析与微观表征[J]. 水力发电学报, 2018, 37(8): 111-120.
[14] 王振山, 李亚坤, 韦俊, 等. 玄武岩纤维混凝土氯盐侵蚀行为及力学性能试验研究[J]. 实验力学, 2020, 35(6): 1060-1070.
[15] 侯敏, 陶燕, 陶忠, 等. 关于玄武岩纤维混凝土的增强机理研究[J]. 混凝土, 2020(2): 67-71, 75.
[16] 王海龙, 李庆斌. 孔隙水对湿态混凝土抗压强度的影响[J]. 工程力学, 2006(10): 141-144, 179.
[17] 薛维培, 刘晓媛, 姚直书, 等. 不同损伤源对玄武岩纤维增强混凝土孔隙结构变化特征的影响[J]. 复合材料学报, 2020, 37(9): 2285-2293.
[18] 余兴国, 陈宇良, 经承贵, 等. 再生混凝土常规三轴受压性能试验研究[J]. 混凝土, 2015(6): 17-21.
[19] 段运, 杨子江, 王起才, 等. 负温环境下混凝土孔结构与强度和渗透性的关系[J]. 材料导报, 2022(15): 1-10.
[20] 张彬, 杨硕, 周军霞. 多维荷载对不同含水率混凝土渗透性的影响[J]. 长江科学院院报, 2019, 36(4): 109-112.
[21] 石东升, 王安. 矿渣细骨料混凝土孔隙结构对抗压强度的影响[J]. 混凝土, 2016(3): 80-83.
[22] 薛维培, 范红君, 高聪, 等. 荷载-温度耦合影响下混杂纤维/混凝土三轴压缩渗透行为[J/OL]. 复合材料学报: 1-8[2022-06-21]. DOI:10.13801/j.cnki.fhclxb.20211119.001.
[23] 张华, 郜余伟, 李飞, 等. 高应变率下聚丙烯纤维混凝土动态力学性能和本构模型[J]. 中南大学学报(自然科学版), 2013, 44(8): 3464-3473.
[24] 吴伟, 冯虎. 碳纤维混凝土动态力学特性试验研究[J]. 复合材料科学与工程, 2021(10): 13-18.
[25] 张野. 短切玄武岩纤维混凝土基本力学性能研究[D]. 哈尔滨: 东北林业大学, 2011.
[26] 高真, 曹鹏, 孙新建, 等. 玄武岩纤维混凝土抗压强度分析与微观表征[J]. 水力发电学报, 2018, 37(8): 111-120.
[27] 王意. 玄武岩纤维混凝土力学性能试验研究[D]. 成都: 西南交通大学, 2018.
[28] 薛维培, 高聪, 申磊, 等. 围压对高温后玄武岩纤维混凝土渗透率及孔隙结构的影响[J]. 建筑材料学报, 2021, 24(4): 742-748.
[29] 陈峰, 童生豪, 任健华, 等. 玄武岩纤维水泥土的抗渗性能研究[J]. 深圳大学学报(理工版), 2021, 38(2): 157-162.
[30] 陈峰宾, 许斌, 焦华喆, 等. 玄武岩纤维混凝土纤维分布及孔隙结构表征[J]. 中国矿业大学学报, 2021, 50(2): 273-280.