FUNDAMENTAL STUDY ON MEASUREMENT METHOD FOR FIXED AMOUNT OF CO₂ BY TOC METHOD IN CALCIUM COMPOUNDS THAT SIMULATE CEMENT HYDRATES

Abstract

A fundamental study was conducted to establish a measurement method for the fixed amount of CO₂ in the cementitious materials. The fixed amount of CO₂ in the calcium compounds that simulate cement hydrates containing monocarbonate was measured by the TG-DTA method and TOC method, and their values were compared. As a result, the TOC method provided highly accurate measurement values under the conditions of a sample size of 150μm or less and dripping amount of pure water of 4mL/g or more on the sample. The measurement values of the fixed amount of CO₂ in monocarbonate were generally accurate by the TOC method, while those by the TG-DTA method showed smaller values than the theoretical ones.