Abstract
Three specimens each of reinforced concrete beams made using either ordinary concrete or expansive concrete were prepared, each with a different effective height and mix proportion, all for the same test factor and level. The occurrence of flexural cracks of each beam under testing was recorded, and the test results were compiled, taking into account variations. Further, methods for the calculation of the stress-strain curve and ultimate tensile strain of the concrete lowest fiber under flexural tensile stress were presented, and from the reinforced concrete beam measurement results, the tensile characteristics of concrete were compared with the identified results. As a result, ultimate tensile strain of expansive concrete with large expansion energy was confirmed to be generally greater than that of ordinary concrete.
