RESEARCH ON FIXED CARBON CONTENT DISTRIBUTION AND MEASURING METHOD OF PASTE SUBJECTED TO CARBONATION CURING

Abstract

An inorganic carbon analyzer （coulometer） was used to measure the amount of fixed carbon in the carbonated paste. Since the coulometer has a limited track record and few facilities for its use, a reliability evaluation using reagents and a study of its use with test specimens were also conducted. As a result, the coulometer was tested three times, and the average value was found to be within ±2％ error. Coulomter, thermal analysis, and X-ray diffraction were also used to analyze the distribution of fixed carbon dioxide content in the partially carbonated paste. The results showed that about half of the maximum fixed amount of carbon dioxide was fixed even around the depth of neutralization with phenolphthalein, and that carbon dioxide was fixed even at unneutralized positions.