Salinization effects on the water sorption of porous building materials
conference paper
The interaction of salt transport and moisture transport plays a crucial role in some deterioration mechanisms of porous building materials. For this reason it has been an important research subject for mant' years. Yet most research was still complicated by the lack of experimental techniques capable of measuring., salt content. Therefore TNO initiated some research projects. in which the development and 'practical use' of such experimental techniques are central issues.
Part of the research focuses on the hygroscopic response of salinized porous materials. For a typical fired-clay brick and a calcium silicate brick, both salted with sodium chloride. the sorption isotherm was measured continuously by means of Microcalorimetry. The fired-clay brick contained no micropores and consequently the sorption isotherm was determined by sodium chloride only. The calcium silicate brick. however contained a reasonable amount of micropores so that the sorption isotherm was determined both by sodium chloride and by capillary condensation in the micropores. This paper shows that the measured adsorption isotherms can be predicted by a modified Kelvin equation accounting for capillary condensation at a solution-vapour interface
Part of the research focuses on the hygroscopic response of salinized porous materials. For a typical fired-clay brick and a calcium silicate brick, both salted with sodium chloride. the sorption isotherm was measured continuously by means of Microcalorimetry. The fired-clay brick contained no micropores and consequently the sorption isotherm was determined by sodium chloride only. The calcium silicate brick. however contained a reasonable amount of micropores so that the sorption isotherm was determined both by sodium chloride and by capillary condensation in the micropores. This paper shows that the measured adsorption isotherms can be predicted by a modified Kelvin equation accounting for capillary condensation at a solution-vapour interface
TNO Identifier
329405
Source title
Proceedings and Minutes of the CIB W40, Praag, Czech Republic, 31 August-3 September
Pages
1-6
Files
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