STUDY ON CONTROL METHOD FOR JOINT MORTAR STRENGTH OF CONCRETE BLOCK MASONRY WITH SCRATCH

Abstract

This paper deals with the estimation method of joint mortar strength in CB masonry with scratch for the quality control. According to the test results, it was found the correlation between strength and width of scratch. The test results also showed that the surface roughness and the moisture content in joint affected the width of scratch. The width was increased with increase of the moisture content and the surface roughness. Water absorption amount of CB from mortar depended on the mortar type, CB type and joint width and it was found that mortar strength was reduced by water absorption of CB. Finally, we proposed an estimation method for joint mortar strength using the scratch test and quality control method on the basis of these results.