Influence and evaluation on durability of finishing materials of existing reinforced concrete structures over 40 years

Abstract

Reinfoced concrete structures have been constructed so much by rapid economic growth in 1960's.These structures have been deteriorating with time at present, and it is demanded at society that structures can run a long term. So the repair and retrofitting should be necessary to keep the use of existing structures, therefore condition assessment of existing reinforced concrete structures is quite important.The carbonation is one of the factor of deterioration of structures. Finishing materials affect the carbonation of concrete structures. However the opportunity of survey for actual buildings are not sufficient.Then this study reports on the condition assessment of reinforced concrete structures which were built at 1960's, from the viewpoints of visual observation, cracks on the outer wall, concrete quality such as compressive strength and carbonation depth by using core samples extracted from the structure. Also air permeability test was performed with nondestructive test.