Effect of Highland Barley Straw Ash on the Bonding Strength of Magnesium Oxychloride Cement Mortar
SHU Xiuyuan1, QIAO Hongxia1,2,*, CAO Feng1,2, CUI Lijun1
1 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 School of Civil and Tansportation Engineering, Qinghai Minzu University, Xining 810000, China
Abstract: In order to study the process of using magnesium oxychloride cement mortar (MOCM) modified with highland barley straw ash (HBSA) as a protective layer for ordinary concrete (NC) to resist brine erosion in the western salt lake area, this work uses ordinary concrete as a bonding agent. For the base layer, the effects of factors such as incorporating HBSA into MOCM, applying interface agents on the concrete base layer, and different MOCM thicknesses on its bonding strength were studied. The influence of various factors on the bond strength of MOCM was studied through bond pull-out tests, the optimal design parameters were determined, and the damage and deterioration rules of the bond strength of HBSA-modified MOCM under salt brine erosion environment were further analyzed. The phase composition, functional group structure and micro-morphological characteristics of MOCM were analyzed by microscopic testing technology, and the mechanism of the influence of HBSA on the bonding properties of MOCM was revealed. The results show that the MOCM with a thickness of 18 mm, doped with HBSA and coated with an interfacial agent has the highest bond strength and the strongest resistance to salt brine erosion. There are more active SiO2 in HBSA, which can undergo secondary hydration reaction with the hydration product of MOCM to generate hydrated magnesium silicate (M-S-H) gel, which fills the internal pores of MOCM, enhances compactness and improves bond strength.
1 Wu K L, Chi D Z. Tibet Journal of Agricultural Sciences, 2011, 33(1), 4 (in Chinese). 吴昆仑, 迟德钊.西藏农业科技, 2011, 33(1), 4. 2 Bai Y X, Yao X H, Yao Y H, et al. Scientia Agricultura Sinica, 2019, 52(2), 228 (in Chinese). 白羿雄, 姚晓华, 姚有华, 等.中国农业科学, 2019, 52(2), 228. 3 Jia J Q, Li X D. Food and Nutrition in China, 2016, 22(11), 21 (in Chinese). 贾娟琪, 李先德.中国食物与营养, 2016, 22(11), 21. 4 Li H C, Xu G Y, Wang H. Biomass Chemical Engineering, 2010, 44(2), 40 (in Chinese). 李海朝, 徐贵钰, 汪航.生物质化学工程, 2010, 44(2), 40. 5 Chen K F, Qiao H X, Wang P H, et al. Journal of Building Materials, 2020, 23(3), 557 (in Chinese). 陈克凡, 乔宏霞, 王鹏辉, 等.建筑材料学报,2020,23(3), 557. 6 Jin Z Q. Durability and service life prediction of concrete exposed to harsh environment in west of China. Ph.D. Thesis, Southeast University, China, 2006(in Chinese). 金祖权. 西部地区严酷环境下混凝土的耐久性与寿命预测.博士学位论文,东南大学, 2006. 7 Hu Y Z, Liu F X. Materials Reports, 2014, 28(S1),348(in Chinese). 胡云珍, 刘凤侠.材料导报, 2014, 28(S1),348. 8 Orhan Aksoğan, Hanifi Binici, Ersin Ortlek. Construction and Building Materials, 2016, 106, 253. 9 Hasan Biricik. Cement and Concrete Research, 2000, 30, 1509. 10 Cao F, Qiao H X, Wang P H, et al. Advanced Engineering Sciences, 2022, 54(4), 155 (in Chinese). 曹锋, 乔宏霞,王鹏辉, 等. 工程科学与技术, 2022, 54(4), 155. 11 Cao F, Qiao H X, Li Y K, et al.Construction and Building Materials,2022, 315, 125802. 12 Dominik Nied, Kasper Enemark-Rasmussen, Emilie L'Hopital, et al.Cement and Concrete Research, 2016, 79, 323. 13 Ellina Bernard, Barbara Lothenbach, Christophe Chlique, et al.Cement and Concrete Research, 2019, 116, 309. 14 Li Y, Yu H F, Dong J M, et al.Journal of the Chinese Ceramic Society, 2013,41(11),1465 (in Chinese). 李颖, 余红发, 董金美,等. 硅酸盐学报, 2013, 41(11), 1465. 15 Carlos Marmorato Gomes, Noe Cheung, Gabriel Misale, et al.Construction and Building Materials, 2020, 272, 121650.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2023, Vol. 37 
