Metakaolin Improves Adaptability of Cement-based Grouting Materials Used in High Geotemperature Tunnel Engineering
FAN Lidan1,2, SUN Liang1, YU Yongqiang1,2, ZHANG Jiyun1, GUO Jiaqi1
1 School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000,Henan, China 2 International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Jiaozuo 454000,Henan, China
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.
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