WATER CONTENT MEASURING METHOD OF RECLAIMED GYPSUMS DERIVED FROM WASTE PLASTERBOARDS FOCUSING ON SOLUBILITY OF WATER TO GLYCEROL

Abstract

 In this study, in order to investigate the application of the new water content measuring method of reclaimed gypsums derived from waste plasterboards by using unheated type, we performed the basic tests on measuring water content by using “glycerol-method”.

 As the results, it was found that the refractive index varied depending on elapsed time after dripping glycerol on prism, the influence of the refractive index on water mixing time was not recognized. And in the case directly dripping the sample solution on prism by using syringe for reagent gypsum dihydrate, the water content measuring glycerol method was close to true water content and liner relation with high correlation was obtained, the validity of water content measuring by using unheated type was confirmed.