Influence of freezing rate on cryo-damage of cementitious material |
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| Authors: | Ke-fei Li Qiang Zeng |
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| Institution: | (1) Civil Engineering Department, Tsinghua University, Beijing, 100084, China |
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| Abstract: | 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.
Project supported by the National Natural Science Foundation of China (No. 50538060), and the Fundamental Research Grant of
Tsinghua University (No. JCqn2005004), China |
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| Keywords: | Freezing rate Deformation Crystallization pressure Damage |
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