コンクリート強度の早期判定のための一般式 : 一般の合格判定規準に対して早期判定を適用する場合

概要

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In the previous paper, we presented an equation for the prediction of 28 day strength as the characteristic value of concrete quality from the results of earlier test. That equation is applicable to the compliance criteria defined with the mean-minimum value of three samples, for example the Japanese Industrial Standard, JIS A 5308. In this paper, we extend the bounds of application of that equatoin for any compliance criteria defined with the values of n samples, for example JASS 5. Generalized equation derived as follows; F_<28>=a・F_a+b-K_0・S_e(√<P_N^2+1>-P_N) where P_N=(σ_28/√<N>)/S_e F_<28> : Estimated value as 28 day strength F_a : Results of earlier test a, b : Coefficients of regression equation in correlation between earlier strength and 28 day strength σ_<28> : Standard deviation in 28 day strength N : Numbers of test K_0 : Normal deviation corresponding to the value of the ratio of risk from 1
1981-05-30