Study on Properties and Freeze-thaw Deterioration of Modified SiO2 Aerogel Cement-based Composite Mortar
YU Bentian1,*, YANG Yuxiang1, LIU Jiang2, WANG Yonggang2, WANG Pengyong2, XIE Chao1
1 School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China 2 The 2nd Engineering Co., Ltd., of China Railway 21st Bureau Group, Lanzhou 730000, China
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.
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2023, Vol. 37 
