Influence of freezing rate on cryo-damage of cementitious material

Influence of freezing rate on cryo-damage of cementitious material
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冻结速率对胶凝材料低温损伤的影响

DOI:
10.1631/jzus.a0820108
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发表时间:
2009
影响因子:
3.2
通讯作者:
--
中科院分区:
工程技术3区
文献类型:
--
作者:

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我们报告了一项关于冷冻速率对水泥材料低温变形和低温损伤影响的实验研究。饱和、干燥和加气砂浆样本在三个冷冻速率下进行实验室冻融循环,而不与环境进行水分交换。除基本力学性能和孔隙分布外,还对试件各周期的冷冻膨胀、残余变形进行测量。从结果可以看出,高冷冻速率确实会增强材料的冷冻膨胀,而低温损伤对于低冷冻速率更为重要。因此,对于水泥材料的冻害程度,应同时考虑冻结速率和冻结持续时间。
We report an experimental investigation on the impact of the freezing rate on the cryo-deformation and cryo-damage of cementitious materials. Saturated, dried and air-entrained mortar specimens are subjected to laboratory freeze-thaw cycles under three freezing rates without moisture exchange with the environment. In addition to basic mechanical properties and pore distribution, the measurement is also effectuated for freezing expansion, residual deformation of the specimens in each cycle. From the results it is observed that a high freezing rate does augment the freezing expansion of material while the cryo-damage is more important for a low freezing rate. Accordingly, both the freezing rate and freezing duration should be taken into account for the cyro-damage extent of cementitious materials.
DOI: 10.1016/s0008-8846(98)00103-3
发表时间: 1998-09-01
影响因子: 11.4
作者:
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通讯作者: Liu, X
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