Influence of early-age loading on the propertres of concrete

In this paper, the influence of early loading on young concrete on the long-term performance of loaded concrete was investigated by retesting the 28 days characteristics of the loaded concrete specimens. Both high strength concrete and normal strength concrete were chosen. Apply certain static load (30%, 50% and 70% of compressive st rength) on young concrete cylinder specimens at ages of 8 hours, 12 hours, 1 day, 2 days and 3 days, then cure these loaded specimens in air or in curing room, wait t o test their 28 days compressive strength. Of course, the referential specimens were tested simultaneously. By this way, the effects of static load level, curing conditions and age at time of loading on young concrete were compared and the concrete autogenous healing capacity was studied. The results show that the concrete has the autogenous healing ability, and age at time of loading and the following curing condition influence long-term performance of loaded and the following curing condition influence long-term performance of loaded concrete more than the preload level.