Increased strength and related mechanisms for mortars at cryogenic temperatures

被引:69
|
作者
Jiang Zhengwu [1 ]
Deng Zilong [1 ]
Zhu Xinping [1 ]
Li Wenting [1 ]
机构
[1] Tongji Univ, Minist Educ, Key Lab Adv Civil Engn Mat, Shanghai 201804, Peoples R China
基金
中国国家自然科学基金;
关键词
Compressive strength; Freezing; Pore water; Cryogenic temperatures; Thermoporometry; DIRECT LNG CONTAINMENT; HARDENED CONCRETE; ICE; THERMOPOROMETRY; CALORIMETRY; WATER; SIZE; PERMEABILITY; BEHAVIOR;
D O I
10.1016/j.cryogenics.2018.06.005
中图分类号
O414.1 [热力学];
学科分类号
摘要
Properties of cement-based materials at cryogenic temperatures are quite different from those at room temperatures. The strength of mortars at cryogenic temperatures was experimentally studied and an empirical model was established. The freezing thermodynamic process of pore water and pore size distribution in mortars were characterized by differential scanning calorimeter (DSC) and thermoporometry (TPM), respectively. The relationship between the increased cryogenic strength and pore ice formation was discussed. The results showed that flexural strength of mortars increased at a higher rate than compressive strength. Water content and initial strength at room temperatures were the main factors influencing the cryogenic strength. Higher water content and higher initial strength resulted in higher cryogenic strength. Ice formation in pores is one of the main reasons for the mortar's cryogenic strength increase. Nearly half of the water remained unfrozen in pores with radius less than 40 nm at - 40 degrees C. Both ice formed in capillary pores and gel pores contributes to the strength increase observed at cryogenic temperatures.
引用
收藏
页码:5 / 13
页数:9
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