Abstract
This paper is intended to quantify the crack formation condition when cracks occur over horizontal reinforcing bars by the subsidence of concrete. The subsidence tests of a concrete specimen in which a reinforcing bar was suspended from the fixed crosshead of a test machine with a piano wire were conducted by employing experimental parameters such as loading ages, concrete cover, loading speed and effect of aggregate. As a result, it was made clear that the rate of subsidence of concrete when cracking occurs at the surface of concrete is approximately 0.67mm at 3hours ages and that it decreases suddenly and is approximately 0.06mm at 6hours ages. Using a finite element method to predict stress and strain state in the specimens for the case in which cracks may occur along horizontal reinforcing bars,numerical analysis was done.The local stress and the strain value predicted from a quantity of subsidence rate and load in crack formation obtained from this experiment agreed with previous experiment results.
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