Inorganic Materials and Ceramic Matrix composites |
|
|
|
|
|
Effect of Fly Ash on Performance of Mortars Partially Exposed to Sulfate Solution Under Low Humidity |
SUN Daosheng1, 2, WANG Hui2, LIU Kaiwei1, 2, WANG Aiguo1, 2, LI Ping2, ZHANG Gaozhan1, 2, GUAN Yanmei1, 2
|
1 Anhui Key Laboratory of Advanced Building Materials, Hefei 230601, China 2 School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China |
|
|
Abstract Cement mortars containing 0%, 15%, 30%, and 45% of fly ash were partially immersed in 5wt% Na2SO4 solution for 180d corrosion experiments in T=(20±3) ℃, RH=(35±5)% of relative low humidity environment. The pore structure, capillary sorptivity transportation characteristics, SO42- concentration and volume-loss and mass-loss of the mortars before and after erosion were analyzed, the erosion products were characterized by XRD and SEM. The results show that with the increase of fly ash content for mortars increase the proportion of capillary pores, results in a significant increase in capillary sorptivity transmission characteristics and causes higher SO42- concentration in crystallization zone. The sample without fly ash PO sample, after erosion for 180 days, except for sodium sulfate, the erosion products in the salt crystallization zone of the mortar specimen form more gypsum phase, the main reason for the destruction of the salt crystallization zone of the mortars is chemical erosion. While the sample addition with fly ash samples, the products of salt crystallization zone of sample has only sodium sulfate, and no gypsum obviously. And with the increase of the amount of fly ash, the damage of the mortar specimen is more serious, and shows as more severe physical salt attack, results in much more serious mass-loss of the mortar specimen. It indicates that the mortars with the increase of the amount of fly ash specimen can refine the pores. In the low humidity environment, it will increase the capillary sorptivity transmission rate of the sulfate solution and caused more serious physical salt crystal damage.
|
Published: 14 July 2020
|
|
Fund:This work was financially supported by the National Natural Science Foundation of China (51578004, 51608004, 51778003), Natural Science Foundation of Anhui Provincial Department of Education (KJ2018JD18), Ph.D Research Startup Foundation of Anhui Jianzhu University (2018QD49). |
About author:: Daosheng Sunreceived his B.E. degree in building materials and products from Chongqing University in 1986 and received his Ph.D. degree in materials from the Nanjing Tech University in 2004. He was granted professor in 2005. He is the tutor of Anhui Jianzhu University and Hefei Institute of Physical Science, Chinese Academy of Sciences. He is the member of Anhui Silicate Society, Anhui Cement Standardization Technical Committee and Anhui Cement Association. His research interests include high performance concrete, comprehensive utilization of solid waste, and advanced building materials. Kaiwei Liureceived his Ph.D. degree in materials from Nanjing Tech University in 2014. He has hosted and participated in 10 provincial or ministerial level research projects including National Natural Science Foundation of China (General Program), Natural Scie-nce Foundation of Higher Education of Anhui Province (Key Program), Open Project of State Key Laboratory of High Performance Civil Engineering Materials, Open Project of State Key Laboratory of Materials and Chemical Engineering, and Open Project of Anhui Jianzhu University, and so on. He also participated in the preparation of “Cement and Concrete Materials in Marine Engineering”. His research interests are comprehensive utilization of solid waste and advanced building materials. |
|
|
1 Sun D S, Cheng X X, Liu K W, et al. Materials Reports A:Review Papers, 2018, 32(12), 112(in Chinese). 孙道胜, 程星星, 刘开伟, 等. 材料导报:综述篇, 2018, 32(12), 112. 2 Liu Z Q, Deng D H, Schutter G D, et al. Journal of the Chinese Ceramic Society, 2012, 81(2), 186(in Chinese). 刘赞群, 邓德华, Schutter G D, 等, 硅酸盐学报, 2012, 81(2), 186. 3 Ma K L, Xie Y J, Long G C, et al. Journal of Central South University:Science and Technology, 2010, 41(1), 303(in Chinese). 马昆林, 谢友均, 龙广成, 等. 中南大学学报:自然科学版, 2010, 41(1), 303. 4 Li H, Sun W, Zuo X B. Journal of the Chinese Ceramic Society, 2012, 40(8), 1119. 5 Kawamura M, Torii K, Taniguchi K. Cement & Concrete Research, 1995, 25(4), 759. 6 Liu K W, Sun D S, Wang A G, et al. Journal of Materials in Civil Engineering, 2018, 30(12), 04018309. 7 Bakharev T, Sanjayan J G. Cement & Concrete Research, 2002, 32(2), 211. 8 Pan Z H, Guo S H, Wang X B, et al. In: The 8th International Symposium on Cement&Concrete Abstract. Najing, 2013, pp. 78. 9 Torii K, Kawamura M. Cement & Concrete Research, 1994, 24(2), 361. 10 Sokkary T M E, Assal H H, Kandeel A M. Ceramics International, 2004, 30(2), 133. 11 Zhang F C, Zhao Y, Zhu F W. Journal of Hohai University, 2014, 42(5), 439. 12 Adanan . Cement & Concrete Research, 2003, 33(4), 585. 13 Rodriguez C R E, Uribe A R. Cement & Concrete Research, 2002, 32(12), 1851. 14 Stark D. Durability of concrete in sulfate-rich soils. Portland Cement Association, USA, 1989. 15 Stark D. Performance of concrete in sulfate environments. Portland Cement Association, USA, 2002. 16 Irassar E F, Maio A D, Batic O R. Cement & Concrete Research, 1996, 26(1), 113. 17 Liu Z Q, Deng D H, Schutter G D, et al. Construction & Building Materials, 2012, 28(1), 230. 18 Pel L, Huinink H, Kopinga K, et al. Construction & Building Materials, 2004, 18(5), 309. 19 Puyate Y T, Lawrence C J. Chemical Engineering Science, 1999, 54(19), 4257. 20 Liu Z Q, Liu X N, Hou Y, et al. Journal of Building Materials, 2017, 20(3), 439(in Chinese). 刘赞群, 刘湘宁, 侯乐, 等. 建筑材料学报, 2017, 20(3), 439. 21 Ma K L, Xie Y J, Long G C. Journal of the Chinese Ceramic Society, 2012, 40(10), 1448(in Chinese). 马昆林, 谢友均, 龙广成. 硅酸盐学报, 2012, 40(10), 1448. 22 Thaulow N, Sahu S. Materials Characterization, 2004, 53(2-4), 123. 23 Ma K L, Xie Y J, Long G C, et al. Journal of the Chinese Ceramic Society, 2007, 35(10), 1376. 24 Liu Z Q, Deng D H, Schutter G D, et al. Cement & Concrete Composites, 2011, 33(2), 179. 25 Chen F, Gao J M, Qi B, et al. Construction & Building Materials, 2017, (154), 849 26 Yang S Y, Ma Z, Ma X L, et al. Journal of Ningxia University: Natural Science Edition, 2017, 38(4), 433(in Chinese). 杨淑雁,马钊,马小林,等. 宁夏大学学报:自然科学版, 2017, 38(4), 433 27 Liu Z Q, Li X N, Deng D H, et al. Materials & Structures, 2016, 49(1-2), 719. 28 Liu Q, Shen X D, Xue H J, et al. Journal of Functional Materials, 2017, 48(10), 10066(in Chinese). 刘倩,申向东,薛慧君,等. 功能材料, 2017, 48(10), 10066. 29 Liu Z Q, Hu W L, Hou L. Construction & Building Materials, 2018, 193, 211. 30 Zhang S Y. Corrosion mechanism of concrete subjected to sulfate salt in complex environment.Master's Thesis, Qingdao Technological University, China, 2014(in Chinese). 张淑媛.复杂环境下混凝土硫酸盐侵蚀机理.硕士学位论文, 青岛理工大学, 2014. 31 Mehta, P K, Monteiro P J M. Concrete: microstructure, properties, and materials, third edition, McGraw-Hill Professional, USA, 2006. 32 Zhang J Z, Bian F, Zhang Y R, et al. Construction & Building Mate-rials, 2018, 163, 402. 33 Hall C. Magazine of Concrete Research, 1989, 41, 51. 34 He Z M, Long G C, Xie Y J, et al. Journal of Building Materials, 2012, 15(2), 190(in Chinese). 贺智敏, 龙广成, 谢友均, 等. 建筑材料学报, 2012,15(2), 190. 35 Feng S X, Wang P M. Journal of Building Materials, 2017, 20(3), 321(in Chinese). 丰曙霞, 王培铭. 建筑材料学报, 2017, 20(3), 321. 36 Jin Y N, Zhou S X. Journal of East China Jiaotong University, 2006, 23(5), 4(in Chinese). 金雁南, 周双喜. 华东交通大学学报, 2006, 23(5), 4. 37 Haynes H, Bassuoni M T. Concrete International, 2011, 33(11), 38. 38 Liu Z Q, Deng D H, Schutter G. Construction & Building Materials, 2014, 66, 692. 39 Lee B Y, Kurtis K E. Cement & Concrete Research, 2017, 98, 61. 40 Scherer G W. Cement & Concrete Research. 2004, 34(9), 1613. |
|
|
|