An Examination on Concrete Placement Intervals and Concrete Joint of a Wall with Fc 33 and Fc 36 Concrete
By T. Ohmura and H. Matsufuji
Concrete Journal, Vol.59, No.4, Apr. 2021
- Synopsis
- Sometimes it is not possible to place concrete continuously due to problems or issues at the construction site. In such a case, the appearance of the concrete is inspected after formwork removal, and while color differences across the interface of layers are judged acceptable, the occurrence of cold joints is judged to be a concrete casting defect that requires repair. However, when it is difficult to objectively make a clear judgment, for example in the absence of a significant color difference, or in the case of an intermediate or mixed state between color difference and cold joint, determination of the necessity of repair tends to be left to the subjective judgment of the supervisor. Therefore, in this study, we conducted tests on specimens and cored specimens of concrete placed with a placement interval up to three hours and examined the relationship between the non-destructive test results and the loading test results.
- Keywords:
- Wall, Placement interval, Shear test, Shear stress
