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

doi:10.11896/cldb.21080193

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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.

Key words： nano-silica styrene-butadiene copolymer calcium sulphoaluminate cement physical and mechanical property

Published: 10 May 2023 Online: 2023-05-04

CLC number:

TU528.01

Fund:National Natural Science Foundation of China (51872203,51572196).

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	FAN Yusheng
	WANG Ru

Cite this article:

FAN Yusheng,WANG Ru. Effect of Nano-silica on the Physical and Mechanical Properties of Styrene-butadiene Copolymer/Calcium Sulphoaluminate Cement Composite Mortar[J]. Materials Reports, 2023, 37(9): 21080193-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21080193 OR http://www.mater-rep.com/EN/Y2023/V37/I9/21080193

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