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. 2018 Dec 24;12(1):55.
doi: 10.3390/ma12010055.

Mineralogical Analysis of Historical Mortars by FTIR

M M Jordán  1 , J Jordá  2 , F Pardo  3 , M A Montero  4
Affiliations

Mineralogical Analysis of Historical Mortars by FTIR

M M Jordán et al. Materials (Basel). .

Abstract

A method for quantitative mineralogical analysis by ATR-FTIR [1] has been used first time for analysis of historical mortars. Mixtures of different minerals and gypsum were used in order to measure the minimum band intensity that must be considered for calculations and the detection limit. In this way, the molar absorptivity coefficient in the Lambert⁻Beer law and the components of a mixture in mol percentage can be calculated. The GAMS equation modeling environment and the NLP solver CONOPT (©ARKI Consulting and Development) were used to correlate the experimental data in the samples considered. The characterization of the vernacular mortars by FTIR analysis identifies the predominant minerals of the samples, and in conjunction with XRF and XRD, shows the exact composition of historical mortars, which will optimize the restoration and conservation of monuments, preserving our heritage.

Keywords: FTIR; historical mortars; mineralogical analysis.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Main peak intensity in the IR range of 600–4000 cm−1 with respect to the calcite main peak for several silicates as a function of the number of Si atoms in the formula.
Figure 2
Figure 2
FTIR spectra of several clay–gypsum mixtures (% weight). Total spectrum (a), overlapped bands silicate–sulphate (b).
See this image and copyright information in PMC

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