Quantitative Determination of CaCO₃ in Cement Blends by FT-IR

Abstract

Fourier transform infrared (FT-IR) spectra have been recorded of cement blends containing between 0 and 25% limestone, as well as for 100% limestone. Integrated intensity of the out-of-plane vibration of the carbonate ion was used in relation to the integrated intensity of a peak remaining fairly constant in the cement blends itself. Calibration curves were set by using five measurements of each particular sample. The results are compared to ordinary weight loss measurements. FT-IR is found to be a quick and accurate method for the quantitative analysis of limestone in cement blends.