Impermeability and Crack Resistance of Bentonite and Basalt Fiber Modified Cement Mortar

Abstract

Abstract: In order to improve the impermeability and crack resistance ability of cement mortar, a new type of cement mortar material was developed in this paper. Through the preparation of bentonite and basalt fiber modified cement mortar with different content, the impermeability and crack resistance were tested, and the micro mechanism of cement mortar was analyzed. The results show that the addition of bentonite and basalt fiber enhances the impermeability and crack resistance of cement mortar. When 4% (mass fraction) bentonite and 0.4% (mass fraction) basalt fiber are mixed, the impermeability pressure of cement mortar is the highest, which increases by 61.11% compared with the group withoutbentonite and basalt fiber, and the impermeability grade is P8. At the same time, the crack reduction factor of cement mortar mixed with bentonite and basalt fiber reaches more than 80%, the crack resistance grade belongs to grade I, and the characteristics of cracks are "few, fine and short". Mixing bentonite and basalt fiber improves the compactness of cement mortar and reduces cracks and holes. The addition of bentonite and basalt fiber does not change the type of hydration products of cement mortar, but reduces the crystallinity of calcium hydroxide and promotes the formation of calcium silicate hydrate gel.

Key words: bentonite, basalt fiber, cement mortar, impermeability, crack resistance, microstructure

CLC Number:

TU528.32

CHEN Wenyao, ZHANG Zhuoxiang, MENG Ercong, LI Qiang. Impermeability and Crack Resistance of Bentonite and Basalt Fiber Modified Cement Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(2): 439-447.

References

[1] 李国忠, 田颖, 赵帅. 芳纶纤维砂浆的抗折强度与抗塑性收缩开裂[J]. 建筑材料学报, 2009, 12(1): 93-95+105.
LI G Z, TIAN Y, ZHAO S. Flexural strength and plastic shrinkage cracking resistance of aramid fiber cement mortar[J]. Journal of Building Materials, 2009, 12(1): 93-95+105 (in Chinese).
[2] 王泽龙, 李顺义, 吴朕君. 膨润土改性和复配及在废水处理中的应用进展[J]. 工业水处理, 2022, 42(2): 11-18.
WANG Z L, LI S Y, WU Z J. Application development of modification and compounding of bentonite in wastewater[J]. Industrial Water Treatment, 2022, 42(2): 11-18 (in Chinese).
[3] 杨微, 任孟健, 陈仁朋, 等. 复杂环境条件下改性膨润土的抗盐性能[J]. 浙江大学学报(工学版), 2021, 55(10): 1885-1893.
YANG W, REN M J, CHEN R P, et al. Salt resistance of modified bentonite in complex environment[J]. Journal of Zhejiang University (Engineering Science), 2021, 55(10): 1885-1893 (in Chinese).
[4] 苑丽质. 膨润土改性及其吸附性能研究[J]. 应用化工, 2016, 45(3): 482-484.
YUAN L Z. Study on modification and adsorption properties of bentonite[J]. Applied Chemical Industry, 2016, 45(3): 482-484 (in Chinese).
[5] KUMAR B P, RAO V R, REDDY M A K. Effect on strength properties of concrete by partial replacement of cement with calcium bentonite and fly ash[J]. International Journal of Civil Engineering and Technology, 2017, 8(84): 450-455.
[6] 刘益良, 苏幼坡, 殷尧, 等. 膨润土改性胶凝材料的研究进展[J]. 材料导报, 2021, 35(5): 5040-5052.
LIU Y L, SU Y P, YIN Y, et al. Research progress of bentonite modified cementitious materials[J]. Materials Reports, 2021, 35(5): 5040-5052 (in Chinese).
[7] 秦鸿根, 眭斌, 郭伟. 膨润土对炉底渣轻质保温砂浆性能的影响[J]. 建筑材料学报, 2010, 13(3): 418-420.
QIN H G, SUI B, GUO W. Effect of bentonite on properties of furnace slag light insulation mortar[J]. Journal of Building Materials, 2010, 13(3): 418-420 (in Chinese).
[8] 肖佳, 孟庆业, 郭明磊, 等. 膨润土改善水泥基材料抗低温硫酸盐侵蚀性能[J]. 建筑材料学报, 2016, 19(1): 156-161.
XIAO J, MENG Q Y, GUO M L, et al. Improvement of resistance of cementitious materials to sulfate attack at low temperature by bentonite[J]. Journal of Building Materials, 2016, 19(1): 156-161 (in Chinese).
[9] HU Y, DIAO L, LAI Z Y, et al. Effects of bentonite on pore structure and permeability of cement mortar[J]. Construction and Building Materials, 2019, 224: 276-283.
[10] 侯娟, 滕宇阳, 李昊, 等. 多孔介质曲折度对膨润土衬垫渗透性能的影响[J]. 湖南大学学报(自然科学版), 2022, 49(1): 155-164.
HOU J, TENG Y Y, LI H, et al. Influence of porosity and tortuosity on hydraulic conductive of geosynthetic clay liner[J]. Journal of Hunan University (Natural Sciences), 2022, 49(1): 155-164 (in Chinese).
[11] ANIRUDHAN T S, SUCHITHRA P S, RIJITH S. Amine-modified polyacrylamide-bentonite composite for the adsorption of humic acid in aqueous solutions[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2008, 326(3): 147-156.
[12] 房斌, 张松, 江月, 等. 膨润土在河道治理中的应用[J]. 矿产综合利用, 2021(4): 87-90.
FANG B, ZHANG S, JIANG Y, et al. Study on the application of bentonite in river regulation[J]. Multipurpose Utilization of Mineral Resources, 2021(4): 87-90 (in Chinese).
[13] 温淑瑶, 孙笑春, 马毅杰, 等. 新型水处理剂改性膨润土在水处理中的应用研究进展[J]. 功能材料, 2004, 35(s1): 2599-2602+2606.
WEN S Y, SUN X C, MA Y J, et al. Application study of modified bentonite as new chemicals for water treatment[J]. Journal of Functional Materials, 2004, 35(s1): 2599-2602+2606 (in Chinese).
[14] SIM J, PARK C, MOON D Y. Characteristics of basalt fiber as a strengthening material for concrete structures[J]. Composites Part B: Engineering, 2005, 36(6/7): 504-512.
[15] 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.
CHEN F, TONG S H, REN J H, et al. Impermeability of basalt fiber soil-cement[J]. Journal of Shenzhen University (Science and Engineering), 2021, 38(2): 157-162 (in Chinese).
[16] CZIGÁNY T. Special manufacturing and characteristics of basalt fiber reinforced hybrid polypropylene composites: mechanical properties and acoustic emission study[J]. Composites Science and Technology, 2006, 66(16): 3210-3220.
[17] 丁亚红, 郭书奇, 张向冈, 等. 玄武岩纤维对再生混凝土抗碳化性能的影响[J]. 复合材料学报, 2022, 39(3): 1228-1238.
DING Y H, GUO S Q, ZHANG X G, et al. Influence of basalt fiber on the anti-carbonation performance of recycled aggregate concrete[J]. Acta Materiae Compositae Sinica, 2022, 39(3): 1228-1238 (in Chinese).
[18] 闫昭朴, 王扬卫, 张燕, 等. 玄武岩纤维复合材料静、动态力学性能和抗弹性能研究进展[J]. 材料导报, 2022, 36(4): 243-251.
YAN Z P, WANG Y W, ZHANG Y, et al. Research progress on static and dynamic mechanical properties and ballistic properties of basalt fiber composites[J]. Materials Reports, 2022, 36(4): 243-251 (in Chinese).
[19] 倪蔡辉, 吕生华, 朱琳琳, 等. 氧化石墨烯纳米片层对水泥基复合材料微观结构和性能的影响[J]. 新型建筑材料, 2017, 44(5): 84-88.
NI C H, LV S H, ZHU L L, et al. Effect of graphene oxide nanosheets on microstructure and properties of cement composites[J]. New Building Materials, 2017, 44(5): 84-88 (in Chinese).
[20] 高颂, 蒋林华, 徐秀珍, 等. 塑性水泥基材料溶蚀行为试验研究[J]. 粉煤灰综合利用, 2021, 35(5): 46-53.
GAO S, JIANG L H, XU X Z, et al. Experimental study on the leaching behavior of plastic cement-based materials[J]. Fly Ash Comprehensive Utilization, 2021, 35(5): 46-53 (in Chinese).
[21] 王雨利, 王卫东, 朱建平. 不同石灰石粉掺量对硅酸盐水泥水化的影响[J]. 硅酸盐通报, 2014, 33(11): 2974-2980.
WANG Y L, WANG W D, ZHU J P. Effect of limestone aggregate micro fines with different contents on hydration of Portland cement[J]. Bulletin of the Chinese Ceramic Society, 2014, 33(11): 2974-2980 (in Chinese).
[22] 李相国, 田博, 何超, 等. SO^2-₄/C₃A对单矿C₃S水泥浆体中碳硫硅钙石形成的影响[J]. 硅酸盐通报, 2022, 41(8): 2637-2643.
LI X G, TIAN B, HE C, et al. Effect of SO^2-₄/C₃A ratio on formation of thaumasite in monomineral C₃S cement paste[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(8): 2637-2643 (in Chinese).