Abstract
Compression tests of mortar specimens were conducted to investigate the effect of size and water content on the compressive strength of mortar in a bed joint. Four types of mortar specimens were tested: cube specimens, cylinder specimens, plate specimens that were cut from cubes, and disc specimens that were cast between masonry blocks. Both Type N and Type S mortar were examined. The water content of the mortar varied from 18 % of the total weight of the mortar mix and the water, up to 24 %, and the nominal thicknesses of the plate and disc specimens varied from 6.35 mm to 22.2 mm. Cube and cylinder specimens were subjected to the standard compression test described in ASTM C109. Plate and disc specimens were subjected to the double punch test described in DIN 18555–9. Test results showed that the mortar compressive strength was strongly dependent on the specimen size and water content.
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