Evolution of Linearly Approximated Operating Characteristic Curve of Concrete Strength in Single Sampling Inspection Plans
By Y. Tsuji and Y. Suzuki
Concrete Journal, Vol.64, No.3, Mar. 2026
- Synopsis
- This paper reports on changes in pass/fail acceptance criteria within concrete strength sampling inspection methods by using operating characteristic (OC) curves linearly approximated on a probability scale. As an example, it examines the evolution of acceptance criteria in the Japan Society of Civil Engineers (JSCE) Standard Specifications for Concrete Structures and JIS A 5308, which is based on probability theory. Furthermore, based on acceptance constants for known standard deviations under JIS Z 9003, this study compares both sets of criteria using linearly approximated OC curves. The results indicate that the current deterministic strength acceptance criteria in JIS A 5308, when assuming a sampling inspection framework, result in a neutral quality level where the nonconforming rate is considered to be 50%.
- Keywords:
- Concrete strength sampling inspection method, Linearly approximated OC curve, JSCE Standard Specifications for Concrete Structures, JIS A 5308, Neutral quality level
