Study on investigation method in scratching test of joint mortar strength for concrete block masonry construction system

Abstract

In recent years, masonry joint construction methods are diversified. However, it is not clear mechanical characteristics of masonry system with the various joint form, especially, joint mortar strength. It is not established investigation methods of the joint mortar strength. So, by this research, as a joint strength investigation method in a concrete block construction system, scratch test is considered.We scratched specimens which consists of masonry unit and joint mortar, and measured wide of cracks. We inquire influences by masonry unit, joint mortar, joint width, grade of dryness at the time of construction, and measurement position.