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Tomoyuki HISHIYA, Yasuhiro TAWARA2021 Volume 63 Issue 2 Pages 57-66
Published: May 26, 2021
Released on J-STAGE: September 23, 2021
JOURNAL FREE ACCESS -
accuracy improvement using a robust design methodShinji YASUIKE, Hiroyuki MASAKI2021 Volume 63 Issue 2 Pages 67-82
Published: May 26, 2021
Released on J-STAGE: September 23, 2021
JOURNAL FREE ACCESSTo ensure that recycled materials such as gypsum and coal fly ash are environmentally safe, a rapid test that measures leaching from these materials was developed using the quality engineering parameter design method. Fluoride concentration in leachate is equivalent to that of Japanese regulatory leaching test 46 (JLT-46) and can be estimated rapidly by using a new method in which the samples are stirred at a high speed in a ball mill. This method greatly improved the estimation accuracy. For linear regression, the coefficient of determination between the leached amount of JLT-46 and the estimated value obtained via the quick method was R2=0.95, with a standard error of 0.75 mg/L, for gypsum and R2=0.98, with a standard error of 0.32 mg/L, for fly ash. This is a promising method that can be introduced as part of the inspection process for recycled materials.
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Keishi KUDO2021 Volume 63 Issue 2 Pages 83-94
Published: May 26, 2021
Released on J-STAGE: September 23, 2021
JOURNAL FREE ACCESSDownload PDF (4650K)
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