The influence of cyclic water freezing on gas permeability of non-air-entrained concrete
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Lodz University of Technology, Department of Building Physics and Building Materials, 90 - 924 Al. Politechniki 6, Poland
Publication date: 2021-01-18
Cement Wapno Beton 25(5) 358-366 (2020)
The damage of concrete was characterized by the permeability evolution due to cyclic water freezing. The measurements have been performed on concrete specimens with different watercement ratios [w/c = 0.4 and 0.5] without air-entraining admixtures. The change of compressive strength was also controlled along with freezing cycles. The alteration of pore size distribution was investigated for cement mortars [w/c = 0.4 and 0.5] by means of mercury intrusion porosimetry test. In the case of w/c = 0.50, one can observe an increase in transport parameters such as the intrinsic permeability coefficient. For w/c = 0.40, it can be noticed a lack of ice-induced microstructure degradation. With the increasing number of freeze and thaw cycles, no further destruction of the transport properties was noticed.
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