Physical and mechanical assesment of water proportion in one-coat renders. Its influence on the pathology of the finished coatings
DOI:
https://doi.org/10.3989/ic.2007.v59.i508.581Keywords:
one-coat renders, shrinkage, façades microcraking, ultrasonic, thermogravimetryAbstract
Mortars coating for external facades often contain different additives mixed up in different proportions depending on the manufacturer, so that each mortar should be considered and treated as a composite displaying specific physical characteristics. This article aims to set up some ad hoc procedures that will allow determining the exact proportion of water added to a mortar. The methodology adopted will be based on a preliminary stage of sample- taking from the building site so that, given a defect in the product, it will be possible to detect defects in the mixture and also find out whether the manufacturer’s specifications have been followed or not.
It is shown that there exists a close relationship between the ultrasonic Young’s Modulus of each mortar and its surface cracked area after hydration.
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