Measuring water sorption isotherm of mortar containing chloride

A. Taher, T. Arends, A.J.J. Zanden, van der, H.J.H. Brouwers

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Abstract

The water sorption isotherm of materials is of great importance to predict their durability. Many different methods are used in the literature to measure this water sorption isotherm. Chloride present in concrete elements/structures e.g. in marine exposure, can change the water sorption of the material. In this paper, the water sorption isotherm of a standard mortar with and without chloride is measured with a hygroscopic method. The chloride penetration into the sample is obtained by the vacuum saturation method. Subsequently the sample is placed in a glass vessel and dried. By injecting a known amount of water into the vessel, the water evaporates and is partly adsorbed by the sample until an equilibrium state is reached. With the known amount of the injected water into the vessel, the humidity inside the vessel and the volume of the vessel, one point of the adsorption isotherm is determined. For measuring the next point, more water is injected into the vessel. More points are measured in the same manner until the sample is saturated and with this the adsorption isotherm is completed. Afterwards, the measurement of the desorption isotherm starts with blowing dry air with a known flow, humidity and duration into the vessel. After reaching equilibrium, the first point of the desorption curve is measured. The next point is measured by blowing more dry air into the vessel. This continues until the sample is completely dry and with it the desorption isotherm is also completed.
Original languageEnglish
Title of host publicationXIII International Conference on Durability of Building Materials and Components,(XIII/DBMC), 2-5 September 2014, São Paulo
EditorsM. Quattrone, V.M. John
Pages1093-1100
Publication statusPublished - 2014
Event13th International Conference on Durability of Building Materials and Components (DBMC 2014) - São Paulo, Brazil
Duration: 2 Sep 20145 Sep 2014
Conference number: 13

Conference

Conference13th International Conference on Durability of Building Materials and Components (DBMC 2014)
Abbreviated titleDBMC 2014
CountryBrazil
CitySão Paulo
Period2/09/145/09/14

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