Low heat cement has received widespread attention and application in large volume concrete engineering due to its low hydration heat and high post strength characteristics.Considering the complex environmental service conditions in the western plateau region,this study selected low heat cement and ordinary portland cement as comparative samples to systematically analyze the influence of positive and negative temperature alternating environments on the strength development,pore structure evolution,and microstructure of cement mortar.The results indicate that the alternating environment of positive and negative temperatures can lead to a decrease in the compressive strength of cement mortar.However,low heat cement mortar shows superiority in strength performance compared to ordinary portland cement mortar:under water curing conditions,the strength of low heat cement mortar is 5％higher than that of ordinary portland cement mortar,and 4％higher in positive and negative temperature alternating environments,indicating that low heat cement has stronger tolerance to positive and negative temperature changes.The microstructure analysis further confirms the superiority of low heat cement in terms of pore structure.The porosity,average pore size,and most probable pore size of low heat cement are all lower than those of ordinary portland cement,indicating that its structure is denser and therefore has better durability in positive and negative temperature alternating environments.Although the alternating environment of positive and negative temperatures can cause an increase in pore cracks in both types of cement,low heat cement exhibits stronger resistance.The findings of this study provide scientific basis for the application of low heat cement under extreme climate conditions,especially in complex environmental areas such as the western plateau.Low heat cement has shown extensive application potential due to its excellent performance.
Positive and negative temperature alternationLow heat cementStrengthPore structureMicroscopic morphology
NETL
NSTL
万方数据
