Effect of Nano-silica on the Physical and Mechanical Properties of Styrene-butadiene Copolymer/Calcium Sulphoaluminate Cement Composite Mortar
FAN Yusheng1,2, WANG Ru1,2,*
1 Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China 2 School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
Abstract: To clarify the interaction between nano-silica (NS) and styrene-butadiene copolymer emulsion (SB) in calcium sulphoaluminate (CSA) cement, and to solve the problem of prolonged setting time and reduced compressive strength of SB/CSA cement composite mortar, NS and SB were both used to modify CSA cement mortar. The change of physical and mechanical properties of modified mortar with the dosage of NS was studied, and the mechanism of NS in SB/CSA cement composite mortar was analyzed by hydration heat and hydration products analysis. The results show that NS can effectively shorten the setting time of SB/CSA cement composite mortar and increase the compressive strength, and has a synergistic effect with SB on the improvement of the flexural strength of CSA cement mortar. The optimal addition of NS is 1.5%, which can increase the 28 d compressive and flexural strength by 28% and 30% compared with pure SB modified mortar, respectively. Meanwhile, NS can also reduce the fluidity of the composite mortar, increase the density, reduce air content and the drying shrinkage, and slightly reduce the water capillary absorption. NS can further accelerate the hydration process of SB/CSA cement composite paste and increase the content of ettringite by promoting the hydration of ye'elimite and anhydrite, which can shorten the setting time and improve mechanical properties.
通讯作者:
*王茹,同济大学教授、博士研究生导师。1998年7月毕业于四川大学,获得高分子化工专业学士学位,2003年毕业于四川大学,获得材料学专业博士学位,先后在同济大学和奥地利维也纳工业大学进行博士后研究工作,回国后在同济大学工作至今,2010—2011年在美国哥伦比亚大学进行访问;兼任国际聚合物混凝土学会副理事长。主要从事聚合物水泥基复合材料的基础理论和工程应用研究,发表相关学术论文100余篇,多数被SCI和EI收录;主编Progress in Polymers in Concrete和《干混砂浆原材料及产品检测方法》等著作。ruwang@tongji.edu.cn
范雨生, 王茹. 纳米二氧化硅对丁苯共聚物/硫铝酸盐水泥复合砂浆物理力学性能的影响[J]. 材料导报, 2023, 37(9): 21080193-7.
FAN Yusheng, WANG Ru. Effect of Nano-silica on the Physical and Mechanical Properties of Styrene-butadiene Copolymer/Calcium Sulphoaluminate Cement Composite Mortar. Materials Reports, 2023, 37(9): 21080193-7.
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2023, Vol. 37 
