Abstract: In this work, the effect of alkali-activated slag fly ash (AASFA) on the mechanical properties and chloride penetration resistance of concrete bonding surface was studied. The splitting tensile strength and the chloride ion diffusion coefficient of the bonding surface repaired through three methods are compared and analyzed, which are direct repairing with ordinary concrete (the method C), brushing the interface agent using cement or AASFA paste before repairing with ordinary concrete (the method J) and direct repairing with AASFA concrete (the method S). The results show that AASFA repairing concrete (the method S) with alkali activator modulus of 1.3 has the best effect among the three methods. There is a good correlation between the splitting tensile strength and the chloride penetration resistance of the bonding surface repaired through method S. The two properties are first enhanced, then weakened with the increase of slag content, and reach the strongest when the contents of slag and fly ash account for 50% respectively. After repairing with alkali activated material, under the action of alkali activator, the hydration pro-ducts of slag fly ash and old concrete cement influence each other to promote the reaction, and the generated material improves the mechanical properties and chloride ion penetration resistance of the bonding surface.
1 Zanotti C, Banthia N, Plizzari G. Cement and Concrete Research, 2014, 63(9), 117. 2 Beushausen H, Höhlig B, Talotti M. Cement and Concrete Research, 2017, 92, 84. 3 Huang L K. Journal of Chongqing University of Technology (Natural Science), 2022, 36(2), 101(in Chinese). 黄兰可. 重庆理工大学学报(自然科学), 2022, 36(2), 101. 4 Bonaldo E, Barros J A O, Lourenço P B. International Journal of Adhesion and Adhesives, 2005, 25(6), 463. 5 Santos D S, Santos P M D, Dias-Da-Costa D. Construction and Building Materials, 2012, 37, 102. 6 Santos P M D, Julio E N B S. Materials Journal, 2011, 108(4), 449. 7 Zailani W, Abdullah M, Arshad M F, et al. Materials,2020,14(1),56. 8 Komnitsas K A. Procedia Engineering, 2011, 21(3), 1023. 9 Singh B, Ishwarya G, Gupta M, et al. Construction and Building Mate-rials, 2015, 85, 78. 10 Puligilla S, Mondal P. Cement and Concrete Research, 2013, 43, 70. 11 Lee W K W, van Deventer J S J. Cement and Concrete Research, 2004, 34(2),195. 12 Song W L, Zhu Z D, Pu S Y, et al. Materials Reports B: Research Papes, 2020,34(11),22070(in Chinese). 宋维龙,朱志铎,浦少云,等.材料导报:研究篇,2020,34(11),22070. 13 Chen L, Pan R Y, Shen X D, et al. Journal of Building Materials, 2010, 13(3), 380(in Chinese). 陈琳,潘如意,沈晓冬,等.建筑材料学报, 2010, 13(3), 380. 14 Kumar S, Kumar R, Mehrotra S P. Journal of Materials Science, 2010, 45(3), 607. 15 Puligilla S, Mondal P. Cement and Concrete Research,2013,43(1),70. 16 Zhou W L. Study on performance and compound method of concrete ad-ded with fly ash and/or slag. Ph.D. Thesis, Wuhan University, China, 2013(in Chinese). 周万良. 掺粉煤灰、矿渣混凝土的性能及配制方法研究.博士学位论文,武汉大学, 2013. 17 Ismail I, Bernal S A, Provis J L, et al. Construction and Building Materials, 2013, 48, 1187. 18 Espeche A D, León J. Construction and Building Materials, 2011, 25(3), 1222. 19 Qian Y, Zhang D, Ueda T. Journal of Advanced Concrete Technology, 2016, 14(8), 421. 20 Sfa B, Hxa B, Rz C, et al. Construction and Building Materials, 2020, 250, 118830. 21 Lee N K, Lee H K. Cement and Concrete Composites, 2016, 72, 168. 22 Maria C, Willian A, Isabel S. Materials, 2016, 9(3), 158. 23 Zhang J, Shi C, Zhang Z. Construction and Building Materials, 2019, 226, 21.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2022, Vol. 36 
