Test Methods for Reliable Construction
By T. Ayano, K. Uji, M. Kojima and T. Maruya
Concrete Journal, Vol.48, No.8, Aug. 2010
- Synopsis
- The performance of concrete in a built structure may not always meet the performance requirements established at the design stage. The limit state design method is assumed to consider possible differences by material factors. In actual construction, however, efforts are made to minimize the difference between the strength of specimens and the in-situ strength by careful execution in accordance with various guidelines at each stage of transportation, placement, consolation, finishing, curing, and form/shoring removal. In view of the current design technology and the state of execution, it is vital to develop assessment test methods to accurately confirm the achievement of the established specifications at each stage of execution along with the development of techniques to detemine detailed material factors. At the stage of form removal, for instance, it is important that the attainment of an in-situ compressive strength of 5N/mm2 can be accurately confirmed by an appropriate test method. For this reason, the Committee aims to investigate the current state of quality assessment test methods required for each stage of execution, as well as to elucidate the test methods to evaluate the property of concrete and their adequate timing to be applied in each execution stages, so as to ensure the execution of concrete having the performance intended in the design.
- Keywords:
- certainty of execution, concrete in the structuire, filling capability, quality of cover concrete, quality test method
