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Isotherms identify the equilibrium relationship between relative humidity and water content for a given cementitious material. The shape of the isotherms depends on many factors including (a) concrete mixture proportions, (b) presence of chemical admixtures and supplementary cementitious materials, (c) composition and physical characteristics of the cementitious components and aggregates, (d) entrained air content, (e) type and duration of curing, (f) degree of hydration or age, (g) presence of microcracks, (h) presence of surface treatments such as sealers or form oil, and (i) placement method, including consolidation and finishing. The present test concerns desorption isotherms, which are obtained from drying thin samples of concrete.
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