2-11　Prediction of the Unburned Carbon Content with Stable Carbon Isotope Ratio

Abstract

Fly ash from pulverized coal-fired boilers are used as a raw material for concrete. However, it is known that the unburned carbon in fly ash affect concrete quality. In this study, we investigated a prediction method of the unburned carbon content with EA/IRMS which could measure stable carbon isotope ratio (𝛿¹³C) in raw coals. As a result, the unburned carbon content can be predicted from the value of “Factor of 𝛿¹³C”, “H/C atm%”, “Inert ratio”, and “Fuel ratio”, with the error of 0.6wt% or less.