The Performance Evolution Characteristics of Insitu Concrete at the Permafrost Regions  

作　　者：NING Zuojun LI Haoxin NIE Kangjun Nueraili Maimaitituersun Aihemaitijiang Tuerhong GAO Xiang 宁作君;聂康峻

机构地区：[1]School of Transportation,Kashi University,Kashi 844000,China [2]KeyLaboratory of Advanced Civil Engineering Materials of Ministry of Education,School of Materials Science and Engineering,Tongji University,Shanghai 201804,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2024年第6期1534-1540,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(Nos.52068035,52078372,and 52478272)。

摘　　要：This study aimed to investigate the performance evolution characteristics of concrete under permafrost ambient temperatures and to explore methods to mitigate the thermal perturbation by concrete on the permafrost environment.A program was designed to investigate the properties of various concretes at three curing conditions.The compressive strength development pattern of each group was evaluated and the concrete's performance was characterized by compressive strength damage degree,hydration temperature and SEM analysis in a low temperature environment.The experimental results show that the incorporation of fly ash alone or incombination with other admixtures in concrete under low-temperature curing does not deteriorate its microstructure,and at the same time,it can slow down the hydration rate of cement and significantly reduce the exothermic heat of hydration of concrete.These findings are expected to provide valuable references for the proportioning design of concrete in permafrost environments.

关 键 词：permafrost ambient mineral admixture compressive strength hydration temperature damage degree 

分 类 号：TU528[建筑科学—建筑技术科学]