FAN L D, SUN L, YU Y Q, et al.Effects of HGM content and environmental temperature on performance of cement-based thermal insulation grouting material[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(3):158-164.

doi:10.16186/j.cnki.1673-9787.2021050065

Received:2021/05/17

Revised:2021/07/12

Published:2023/05/25

Effects of HGM content and environmental temperature on performance of cement-based thermal insulation grouting material

FAN Lidan, SUN Liang, YU Yongqiang, ZHANG Jiyun, GUO Jiaqi

School of Civil Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China

Abstract:In order to meet the needs of thermal insulation grouting materials in tunnel construction under high geothermal environment，the metakaolin was applied to replace part of cement for preparation of grout，and the HGM were added to improve the thermal insulation.By simulating different geo-temperature environments indoors，the effect of the content of alkali activator on the compressive strength of cement-metakaolin grouting material and the effect of HGM content and temperature on the performance of the grouting material were discussed.The results showed that the alkali activator could increase the compressive strength by 15.89% at the optimal content of 1%.The increase of HGM content would prolong the setting time and reduce the compressive strength，impermeability，and thermal conductivity of the grouting material.The increase of curing temperature would shorten the setting time，reduce the thermal conductivity，and make the 28d compressive strength and impermeability first increase and then decrease.When the curing temperature exceeded 50 ℃，the compressive strength of the grouting material would shrink in late stage.The SEM and porosity analysis showed that the harden paste cured at 40 ℃ had the lowest porosity，and HGM were wrapped by hydration products，however with weak interface bonding force.

Key words:thermal insulation grouting material;hollow glass microsphere;high geo-temperature;thermal insulation

HGM质量分数和环境温度对水泥基隔热注浆材料性能的影响_范利丹.pdf