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. 2021 Aug 24;14(17):4793.
doi: 10.3390/ma14174793.

Crystal-Chemical and Thermal Properties of Decorative Cement Composites

Vilma Petkova  1 , Ventseslav Stoyanov  2   3 , Bilyana Kostova  4 , Vladislav Kostov-Kytin  1 , Alexander Kalinkin  5 , Irina Zvereva  6 , Yana Tzvetanova  1
Affiliations

Crystal-Chemical and Thermal Properties of Decorative Cement Composites

Vilma Petkova et al. Materials (Basel). .

Abstract

The advanced tendencies in building materials development are related to the design of cement composites with a reduced amount of Portland cement, contributing to reduced CO2 emissions, sustainable development of used non-renewal raw materials, and decreased energy consumption. This work deals with water cured for 28 and 120 days cement composites: Sample A-reference (white Portland cement + sand + water); Sample B-white Portland cement + marble powder + water; and Sample C white Portland cement + marble powder + polycarboxylate-based water reducer + water. By powder X-ray diffraction and FTIR spectroscopy, the redistribution of CO32-, SO42-, SiO44-, AlO45-, and OH- (as O-H bond in structural OH- anions and O-H bond belonging to crystal bonded water molecules) from raw minerals to newly formed minerals have been studied, and the scheme of samples hydration has been defined. By thermal analysis, the ranges of the sample's decomposition mechanisms were distinct: dehydration, dehydroxylation, decarbonation, and desulphuration. Using mass spectroscopic analysis of evolving gases during thermal analysis, the reaction mechanism of samples thermal decomposition has been determined. These results have both practical (architecture and construction) and fundamental (study of archaeological artifacts as ancient mortars) applications.

Keywords: cement replacement materials; marble powder; reaction mechanism; thermal properties; white Portland cement.

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Conflict of interest statement

The authors declared no conflict of interest.

Figures

Figure 1
Figure 1
(a) PXRD pattern of marble powder aggregate. (b) PXRD pattern of white Portland cement.
Figure 2
Figure 2
PXRD patterns of A028, B028, and C028.
Figure 3
Figure 3
PXRD patterns of A120, B120, and C120.
Figure 4
Figure 4
(a) FTIR spectra of raw materials marble powder; (b) FTIR spectra of raw materials white Portland cement. Insertion: magnification of spectral range 1350–400 cm−1 for white Portland cement.
Figure 5
Figure 5
FTIR spectra of A028, B028, and C028. Magnifications: spectral ranges 1300–900 cm−1, and 900–350 cm−1.
Figure 6
Figure 6
FTIR spectra of A120, B120, and C120. Magnifications: spectral ranges 1300–850 cm−1, and 800–350 cm−1.
Figure 7
Figure 7
(a) TG-DTG-DSC curves of raw aggregate—marble powder. (b) TG-DTG-DSC curves of raw white Portland cement.
Figure 7
Figure 7
(a) TG-DTG-DSC curves of raw aggregate—marble powder. (b) TG-DTG-DSC curves of raw white Portland cement.
Figure 8
Figure 8
(a) TG-DTG-DSC curves of A028. (b) TG-DTG-DSC curves of A120. The temperature intervals in which thermal processes take place are marked with a different color background.
Figure 8
Figure 8
(a) TG-DTG-DSC curves of A028. (b) TG-DTG-DSC curves of A120. The temperature intervals in which thermal processes take place are marked with a different color background.
Figure 9
Figure 9
(a) TG-DTG-DSC curves of B028. (b) TG-DTG-DSC curves of B120. The temperature intervals in which thermal processes take place are marked with a different color background.
Figure 9
Figure 9
(a) TG-DTG-DSC curves of B028. (b) TG-DTG-DSC curves of B120. The temperature intervals in which thermal processes take place are marked with a different color background.
Figure 10
Figure 10
(a) TG-DTG-DSC curves of C028. (b) TG-DTG-DSC curves of C120. The temperature intervals in which thermal processes take place are marked with a different color background.
Figure 10
Figure 10
(a) TG-DTG-DSC curves of C028. (b) TG-DTG-DSC curves of C120. The temperature intervals in which thermal processes take place are marked with a different color background.
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