Abstract: In order to figure out the freeze-thaw damage mechanism of high-strength concrete and its relationship with compressive strength, a method combining RapidAir and digital metalloscope was employed to investigate the meso-damages of concrete throughout the freeze-thaw test. The meso-structure′s sensitivity to freeze-thaw damage and the relationship between meso-damage and macro-damage were studied. Results show that high-strength concrete with low air content and large spacing factor does not result in poor freeze-thaw resistance. Pore groups are sensitive to freeze-thaw damage, and micro-cracks tend to appear early between them. This phenomenon corresponds well with the compressive strength loss in the early stage of freeze-thaw cycles (FTCs), but these micro-cracks will not lead to a drastic compressive strength loss. Isolated pore and interfacial transition zone are not sensitive to freeze-thaw damage. If these areas are damaged, the compressive strength will drop non-linearly, indicating the coming macroscopic failure.
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2017, Vol. 31 
