Structure of white cement mortars with high content of marble powder

Stoyanov, Ventseslav; Kostova, Bilyana; Petkova, V.; Pelovski, Y.

doi:10.1007/s10973-012-2433-0

Cited by 9 publications

(13 citation statements)

References 14 publications

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“…The 3rd stage has been characterized by the emission of CO 2 and O 2− due to calcite decarbonation in the temperature range 900-1030 K with 1-1.50 % ML. This temperature range coincide well with the decomposition temperatures of natural/synthetic calcite from our previous investigations [46][47][48]. The calcite decarbonation is carried out in accordance with equilibrium CO 3 2− /CO 2 with CO 2 and O 2− release (Eqs.…”

Section: Tablesupporting

confidence: 86%

TG/DTG-DSC and high temperature in-situ XRD analysis of natural thaumasite

et al. 2021

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This paper investigated thermal properties of natural thaumasite, such as phase composition and reaction mechanism of thermal decomposition using simultaneous TG/DTG-DSC in Ar and Air medium up to 1673 K, coupled with masspectrometer for analysis of evolving gases, and in-situ powder X-ray diffraction measurements. The transitional solid phases, grown with increasing of temperature at thaumasite thermal decomposition, are calcium hydrogen carbonate (Ca(HCO 3) 2) and hydrogen sulphate (Ca(HSO 4) 2), calcite, anhydrite, calcium silicates (wolastonite and larnite), calcium silico-carbonate (spurrite), and calcium silico-sulphate (ternesite). The thermal decomposition in both gaseous media includes the stages of dehydration, dehydroxylation, dacarbonation and desulphuration with obtaining a solid residue of varying degrees of crystallinity. The main solid phase, grown at the highest temperatures, is larnite. Based on the obtained results it was proposed the scheme of chemical reactions, which presents the reaction mechanism of thaumasite thermal decomposition. The defined scheme has both fundamental importance by adding new details of reference data, and practical application for thaumasite identification in chemical archaeology, and in the chemistry of cement and cement-based materials.

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Section: Tablesupporting

confidence: 86%

TG/DTG-DSC and high temperature in-situ XRD analysis of natural thaumasite

et al. 2021

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“…The obtained new PXRD results do not confirm the previous assumption of the isomorphic substitution for carbonate ions in ettringite [15]. They show the redistribution of carbonate ions, as well and sulphate ions in new solids, proven by the detection of spurrite, monosulphoaluminate, calcium hydrogensulphate, and artinite.…”

Section: Pxrd Phase Analysiscontrasting

confidence: 82%

“…The sample C shows the reverse trend-from 0.46% (C028) to 0.69% (C120)-increase of 0.23% (Table 6). These results show the enlarged expansion of C-S-H gel (with structurally bonded water molecules) at B120 due to the sample hydration, which coincides with the measured lowest values of pore volume and highest values of compressive strength [15]. The increase of ML at samples C with prolonged water curing does not correspond to the measured changes in pore volume and compressive strength [15].…”

Section: Th Decarbonation and Desulphuration (730-850 °с)mentioning

confidence: 47%

“…The composite low pore volume and denser structure are demonstrated by the Scanning electron microscopy results, as well. The use of polycarboxylate-based additive decreases the water amount and improves the fine particle dispersion and hardness respectively [15,16].…”

Section: Raw Materials Composition and Samples Preparationmentioning

confidence: 99%

“…For comparison, a composite of Portland cement and quartz sand as cement replacement materials were used. Earlier investigations [15,16] of such composites revealed some difficulties in the identification of samples' solid phases, which made it difficult to determine the generalized scheme of samples' hydration and the reaction mechanism of their thermal decomposition. The present study aims to clarify previously unsolved issues, showing the differences in the samples' reaction mechanisms depending on the used cement replacement material.…”

Section: Introductionmentioning

confidence: 99%

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Crystal-Chemical and Thermal Properties of Decorative Cement Composites

et al. 2021

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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.

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