The compressive strength of coating mortars is considered a fundamental property in most standards and is one of the properties most frequently determined in the laboratory. There are as yet only a few studies on evaluating the compressive strength of coating mortar from specimens collected in situ. This paper analyzes the possibility of correlating non-standard specimens, prepared in laboratory with several coats, with cores extracted from prototypes of brick coated with mortar (traditional and premixed) through the pull-off technique. The results enable us to conclude that the use of those non-standard specimens (with different thickness and various layers) instead of standard ones (specimens with 40 × 160 × 160 mm3, with only one mortar) can be a closer-to-reality alternative to study the compressive strength of renders, particularly those that are applied in more than one coat as traditional renders are.
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