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Desorptivity, the parameter which quantifies water retaining ability, has been determined for freshly-mixed natural hydraulic lime and cement mortars using a modified American Petroleum Institute pressure cell. The results show how greatly this ability depends on hydraulicity. Mix composition is also highly significant: smaller proportion of sand, larger grain size of sand and higher proportion of...
Sharp front theory is used to derive an equation describing the time taken for a wet mortar joint to be dewatered by an absorbent substrate. The equation shows that the time taken to dewater a mortar joint is directly proportional to its thickness and inversely proportional to the transfer sorptivity, itself a function of the sorptivity of the substrate and the desorptivity of the wet mix. Experimental...
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