Application of Fourier Transform infrared spectroscopy (FTIR) coupled with multivariate regression for calcium carbonate (CaCO3) quantification in cement

• The carbonation process of cement with supercritical CO 2 was reevaluated. Fast, low-cost, and reliable models were obtained to quantify CaCO 3 in by FTIR. effect on the matrix must be considered for development PLS. fractions relevant PLS regression are portlandite, C-S-H. model showed a good correlation coefficient low prediction error. Partial least squares (PLS) developed study material matrix. results presented (R = 0.9995) estimation error (RMSEP 3.61 mg /g cement). From results, it observed that portlandite consumption, increase content C-S-H decalcification-polymerization most chemical transformations. Thus, concluded that: i ) is possible obtain fast, FTIR ii method applicable carbonated cement-based materials.