偏高岭土提高水泥基注浆材料在高地温隧道工程中的适应性

doi:10.11896/cldb.20100228

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Abstract To improve adaptation of cement-based grouting material for high geotemperature tunnel, in simulating temperature and humidity conditions, the basic physical properties, mechanical and thermal insulation properties of cement-based grouting materials with different contents of metakaolin were studied. The results showed that the syneresis rate of the grouting material would reduce with the rising of temperature, the increase of metakaolin content, and the decrease of water-binder ratio. Nevertheless, the change of viscosity was just opposite to the syneresis rate. While the water-binder ratio was relatively small, the temperature has little effect on the syneresis rate, and however the temperature and water-binder ratio have obvious effect on the viscosity. The setting time of the grouting material decreased as the temperature increased. Furthermore, when the curing temperature was above 20 ℃,the setting time of the 0.8 water-binder ratio grouting material continuously shortened with the metakaolin increasing. For the grouting material with the water-binder ratio of 1.0, the metakaolin had different effect on the setting time at higher and lower temperatures. When the curing temperature reached 50 ℃, the compressive strength of the harden paste would decreased in the middle and late stages. The compressive strength escalated first and then decreased with the increase of the content of metakaolin, and the maximum value increased by 32.2% when the optimum content was 8% at the curing temperature of 40 ℃. As the curing temperature increased, the strength enhancement factor derived from metakaolin firstly increased and then decreased, and it reached the highest value of 0.4 at the curing temperature of 50 ℃. The cementing strength reached the highest value of 23.8 MPa at the curing temperature of 30 ℃. The thermal conductivity of harden paste decreased linearly with the curing temperature increasing. And meanwhile, the mixing of metakaolin could reduce thermal conductivity.

Key words： high geotemperature metakaolin cement-based grouting material curing temperature thermal conductivity

Published: 25 March 2022 Online: 2022-03-21

CLC number:

U454

Fund:China Postdoctoral Science Foundation(2018M631114), the Scientific and Technological Research Projects in Henan Province (212102310974,222102320034), and the Scientific and Technological Innovation Projects of China Railway Tunnel Consultants Co., Ltd.(H20-095).

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	Articles by authors
	FAN Lidan
	SUN Liang
	YU Yongqiang
	ZHANG Jiyun
	GUO Jiaqi

Cite this article:

FAN Lidan,SUN Liang,YU Yongqiang, et al. Metakaolin Improves Adaptability of Cement-based Grouting Materials Used in High Geotemperature Tunnel Engineering[J]. Materials Reports, 2022, 36(6): 20100228-8.

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http://www.mater-rep.com/EN/10.11896/cldb.20100228 OR http://www.mater-rep.com/EN/Y2022/V36/I6/20100228

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