EFFECT OF CURING AGE ON THE SELF-MONITORING BEHAVIOR OF CARBON-FIBER-REINFORCED MORTAR

The self-monitoring behavior of carbon fiber reinforced mortar was fou nd to be affected in two ways by curing age from 7 to 28 days. Firstly , the electrical resistance increased monotonically with increasing co mpressive strain during first loading at 7 days, but at 14 and 28 days it decreased monotonically. Secondly, the resistance decreased slight ly and irreversibly at the end of each cycle as cycling progressed at 14 and 28 days, but not at 7 days. These effects of the curing age are associated respectively with the effects of the curing age on fiber-c ement bond strength and on cement compliance. (C) 1997 Elsevier Scienc e Ltd.