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Moisture absorption from salt solutions in cement mortar discs during freezing
Moisture uptake at constant sub-freezing temperatures was studied on three different mortars (w/c 0.40, 0.55 and 0.65). The specimens were frozen by submerging them in pre-cooled salt solutions. The main purpose was to test a previously presented hypothesis on the mechanism of salt frost scaling of porous materials, a hypothesis which predicts weight increases due to water absorption caused by the growth of ice crystals formed in the pores. Effects of temperature level, NaCl-concentration (both in the pore solution and in the outer solution), pre-drying, rate of cooling and air-entrainment were studied. Only results from the main test, moisture uptake at different temperature levels, are given in this paper. Large weight increases were observed, a fact which supports the hypothesis.
Moisture absorption from salt solutions in cement mortar discs during freezing
Moisture uptake at constant sub-freezing temperatures was studied on three different mortars (w/c 0.40, 0.55 and 0.65). The specimens were frozen by submerging them in pre-cooled salt solutions. The main purpose was to test a previously presented hypothesis on the mechanism of salt frost scaling of porous materials, a hypothesis which predicts weight increases due to water absorption caused by the growth of ice crystals formed in the pores. Effects of temperature level, NaCl-concentration (both in the pore solution and in the outer solution), pre-drying, rate of cooling and air-entrainment were studied. Only results from the main test, moisture uptake at different temperature levels, are given in this paper. Large weight increases were observed, a fact which supports the hypothesis.
Moisture absorption from salt solutions in cement mortar discs during freezing
Lindmark, S. (author)
1997
10 Seiten, 7 Bilder, 3 Tabellen, 3 Quellen
Conference paper
English
Moisture absorption from salt solutions in cement mortar discs during freezing
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