改性SiO<sub>2</sub>气凝胶水泥基复合砂浆性能及冻融损伤研究

doi:10.11896/cldb.22040197

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Abstract The surface modification of SiO₂ aerogel particles was carried out by using KH570 silane coupling agent, and the modified SiO₂ aerogel was mixed into the cement mortar by using the method of equal volume replacement sand to prepare the modified aerogel cement-based composite mortar. The dry density, flexural and compressive strength, thermal conductivity and pore structure of cementitious composite mortars with different SiO₂ aerogel admixtures were tested. The rapid freeze-thaw cycle test of cementitious composite mortar was carried out, and the influence laws of freeze-thaw cycle on compressive strength, dynamic elastic modulus and thermal conductivity were analyzed, and the mechanism of deterioration of modified SiO₂ aerogel cementitious composite mortar by freeze-thaw cycle was revealed by electron scanning electron microscopy (SEM). The results show that the SiO₂ aerogel particles modified by KH570 can be more completely embedded in the cement mortar, thus improving the pore structure of SiO₂ aerogel mortar. With the increase of the replacement ratio of modified SiO₂ aerogel, the dry density, compressive and flexural strength, and thermal conductivity of cementitious composite mortar decreased significantly, while the porosity decreased first and then increased. When the replacement ratio was 40%, the thermal conductivity decreased by 46%, the flexural strength decreased by 43%, the compressive strength decreased by 68%, and the porosity increased by 49%. SiO₂ aerogel can improve the frost resistance of cement mortar, but with the growth of the number of freeze-thaw cycles, the interfacial damage of SiO₂ aerogel particles and cementitious materials is the main reason for its deterioration.

Key words： silane coupling agent SiO₂ aerogel mechanical properties thermal conductivity frost resistance microscopic performance

Published: 10 December 2023 Online: 2023-12-08

CLC number:

TU528

Fund:Science and Technology Research and Development Program of China Railway Corporation (P2018G004) and the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (IRT_15R29).

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	YU Bentian
	YANG Yuxiang
	LIU Jiang
	WANG Yonggang
	WANG Pengyong
	XIE Chao

Cite this article:

YU Bentian,YANG Yuxiang,LIU Jiang, et al. Study on Properties and Freeze-thaw Deterioration of Modified SiO₂ Aerogel Cement-based Composite Mortar[J]. Materials Reports, 2023, 37(23): 22040197-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22040197 OR http://www.mater-rep.com/EN/Y2023/V37/I23/22040197

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