Physical and chemical treatments influence on the thermal decomposition of a dolomite used as a foaming agent

Mandrino, Djordje; Paulin, Irena; Kržmanc, Marjeta Maček; Škapin, Srečo D.

doi:10.1007/s10973-017-6699-0

Cited by 12 publications

(10 citation statements)

References 19 publications

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“…Before the treatment, the diffractogram fits the card PDF number 89-1304, corresponding to magnesium calcium carbonate at the stoichiometry (Mg 0.03 Ca 0.97 )(CO 3 ), compared with the above-mentioned stoichiometric rate estimated by EDS. 13,15 For thermal treatment at 600 C, we see the emergence of the small peak C(104) that is attributed to calcite (CaCO 3 ) and the peak P(200) of periclase (MgO). 16,17 These results are in line with the above results of EDS.…”

Section: Structural Characterizationmentioning

confidence: 97%

Study of the Influence of Temperature on the Optical and Structural Properties of Dolomite

et al. 2020

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The present work reports the results of structural and optical investigations in samples of natural dolomite, subjected to thermal treatment at different temperatures (500 ℃ to 700 ℃) and times (one up to three hours). The motivation is the evaluation of the changes that may occur in carbonaceous asteroids and meteorites, respectively, subjected to the action of the solar radiation and heated during the fall in the atmosphere. We carried out scanning electron microscopy, electron dispersive spectroscopy, X-ray diffraction, optical reflectance and photoluminescence measurements

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Section: Structural Characterizationmentioning

confidence: 97%

Study of the Influence of Temperature on the Optical and Structural Properties of Dolomite

et al. 2020

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“…The three samples were molded without any compacting treatment in 6 prisms (two prisms for each sample), 40 mm × 40 mm × 160 mm, for 1 day in a moist atmosphere (>95% RH and 20 • C). Then the unmolded samples were stored underwater (20 • C) until strength testing (28 and 120 days) [20,21]. The samples A, B, and C undergoing water curing for 28 days are named A028, B028, C028, and those for 120 days-A120, B120, and C120.…”

Section: Raw Materials Composition and Samples Preparationmentioning

confidence: 99%

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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“…Another interesting property of dolomite is that it can be used as flame retardant for polymers since it releases carbon dioxide (CO 2 ) gas at elevated temperature. 13 A few researchers have reported the effect of dolomite on the flammability of polymer/ dolomite composites. 9,11,12 Amiri et al reported that polyurethane (PU)/dolomite composite produced longer burning time and lower heat release rate compared to PU/clay composites based on cone calorimeter data.…”

Section: Introductionmentioning

confidence: 99%

Flammability, Thermal and Mechanical Properties of Polybutylene Terephthalate/Dolomite Composites

Saidi¹,

Mazlan²,

Hassan³

et al. 2019

JPS

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The objective of this study is to determine the effects of dolomite content on flammability, thermal and mechanical properties of polybutylene terephthalate (PBT)/ dolomite composites. PBT and dolomite were blended together at different dolomite contents (5 wt%, 10 wt% and 15 wt%) via twin screw extruder prior to injection moulding. Limiting oxygen index (LOI) test was used to determine the flammability of the PBT composites. Degree of crystallisation (X c), glass transition (T g), melting (T m) and crystallisation (T c) temperatures were obtained using differential scanning calorimetry (DSC). Three types of mechanical tests were carried out, i.e., flexural, tensile and Izod impact. Morphological study was characterised using scanning electron microscope (SEM). LOI analysis showed that the incorporation of dolomite reduced the flammability of PBT composites. DSC results showed that dolomite has marginal effect on T g and T m of the PBT composites. On the other hand, T c and X c increased with increasing dolomite content which indicates that it can be used as a nucleating agent. The presence of dolomite increased the flexural properties, tensile strength and Young's modulus of PBT composites. However, the elongation at break and impact strength were significantly decreased due to poor adhesion between dolomite and PBT. PBT/D-15 composite was found to have the optimum mechanical properties compared with other PBT/dolomite composites. SEM micrograph revealed that dolomite is uniformly distributed at lower dolomite content but agglomerated at higher content.

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Physical and chemical treatments influence on the thermal decomposition of a dolomite used as a foaming agent

Cited by 12 publications

References 19 publications

Study of the Influence of Temperature on the Optical and Structural Properties of Dolomite

Study of the Influence of Temperature on the Optical and Structural Properties of Dolomite

Crystal-Chemical and Thermal Properties of Decorative Cement Composites

Flammability, Thermal and Mechanical Properties of Polybutylene Terephthalate/Dolomite Composites

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