POLYMERS AND POLYMER MATRIX COMPOSITES |
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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,*
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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 |
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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.
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Published: 10 May 2023
Online: 2023-05-04
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Fund:National Natural Science Foundation of China (51872203,51572196). |
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