Cracks in Sorel's cement polishing bricks as a result of magnesium oxychloride carbonatation

Castellar, M. D. de; Lorente, J.C.; Traveria, A.; Tura, J.M.

doi:10.1016/0008-8846(96)00102-0

Cited by 29 publications

(10 citation statements)

References 3 publications

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“…Although the chlorocarbonate phase could reduce leaching, its formation caused a large volume change that induced cracking in the surrounding marble, causing considerable damage. This corroborates an earlier study by Castellar et al, 317 who found cracks in MOC polishing bricks that they assigned to dimensional changes during carbonation. Maravelaki-Kalaitzaki and Moritou also noted the presence of hydromagnesite in leached, carbonated mortars, potentially as a degradation product of chlorocarbonate.…”

Section: Chlorocarbonate: Relation To Strength and Durabilitysupporting

confidence: 93%

Magnesia-Based Cements: A Journey of 150 Years, and Cements for the Future?

2016

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This review examines the detailed chemical insights that have been generated through 150 years of work worldwide on magnesium-based inorganic cements, with a focus on both scientific and patent literature. Magnesium carbonate, phosphate, silicate-hydrate, and oxysalt (both chloride and sulfate) cements are all assessed. Many such cements are ideally suited to specialist applications in precast construction, road repair, and other fields including nuclear waste immobilization. The majority of MgO-based cements are more costly to produce than Portland cement because of the relatively high cost of reactive sources of MgO and do not have a sufficiently high internal pH to passivate mild steel reinforcing bars. This precludes MgO-based cements from providing a large-scale replacement for Portland cement in the production of steel-reinforced concretes for civil engineering applications, despite the potential for CO2 emissions reductions offered by some such systems. Nonetheless, in uses that do not require steel reinforcement, and in locations where the MgO can be sourced at a competitive price, a detailed understanding of these systems enables their specification, design, and selection as advanced engineering materials with a strongly defined chemical basis.

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Section: Chlorocarbonate: Relation To Strength and Durabilitysupporting

confidence: 93%

Magnesia-Based Cements: A Journey of 150 Years, and Cements for the Future?

2016

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“…50 Carbonation occurred on the MOC bricks after being exposed in air for 5 months. 65 It was found that the The setting time was prolonged, 17,69 and compressive strength was decreased. 17,18,69 The compressive strength retention coefficient was increased to be more than 0.8.…”

Section: Phase Transformation Of Moc In Service Environmentmentioning

confidence: 98%

Recent development in magnesium oxychloride cement

Guo

Zhang

Soe³

et al. 2018

Structural Concrete

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This paper presents a review for the key literatures on magnesium oxychloride cement (MOC) to establish a comprehensive and insightful understanding of MOC. The main aim of this review is to identify the most common problems in the development and application of the MOC and the various methods to solve these problems. The characteristics of MOC including composition of hydration phases, strength development, and durability are reviewed. In particular, the various factors influencing the water resistance of MOC, the most critical characteristics of MOC, such as the reactivity of magnesium oxide, additives, and curing conditions are reviewed. Finally, the methods to improve water resistance and its related issues of MOC from the literature are summarized and future research is proposed.

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“…A wide variety of applications for magnesium oxychloride cements were found, primarily as a flooring material for its elastic and acoustic properties, resistance to a charge accumulation, and decorative ivory-like appearance [10]. Moreover, it was successfully used in fire protective systems [11], grinding wheels [12], decorative elements [13], wall insulation [14], ship decks, underground armament factories, and bunkers [15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structure, and Thermal Stability of Magnesium Oxychloride 5Mg(OH)2∙MgCl2∙8H2O

et al. 2020

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Today, low-energy and low-carbon footprint alternatives to Portland cement are searched because of huge CO2 emissions coming from Portland clinker calcination. Because of some superior properties of magnesium oxychloride cement (MOC) and the lower carbon footprint of its production, MOC became an intensively studied material with high application potential for the design and development of construction products. In this contribution, magnesium oxychloride with stoichiometry 5Mg(OH)2∙MgCl2∙8H2O (Phase 5) was prepared and characterized. The kinetics of formation and the phase composition of the material were determined using X-ray diffraction and consequent Rietveld analysis. The morphology was studied by scanning electron microscopy, and the chemical composition was determined by both energy-dispersive spectroscopy and X-ray fluorescence. Moreover, the simultaneous thermal analysis in combination with mass spectroscopy and Fourier-transform infrared spectroscopy was employed to study the thermal stability. Using mass spectroscopy, we were able to clarify the mechanism of water and hydrochloric acid release, which was not previously reported. The observed structural and chemical changes induced by exposure of studied samples to elevated temperatures were linked with the measured residual macro and micro parameters, such as bulk density, specific density, porosity, water absorption, compressive strength, and pore size distribution. The Phase 5 revealed a needle-like crystalline morphology which formed rapidly and was almost completed after 96 h, resulting in relatively high material strength. The four-day compressive strength of magnesium oxychloride cement was similar to the 28-day compressive strength of Portland cement. The thermal stability of Phase 5 was low as the observed disruptive thermal processes were completed at temperatures lower than 470 °C.

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Cracks in Sorel's cement polishing bricks as a result of magnesium oxychloride carbonatation

Cited by 29 publications

References 3 publications

Magnesia-Based Cements: A Journey of 150 Years, and Cements for the Future?

Magnesia-Based Cements: A Journey of 150 Years, and Cements for the Future?

Recent development in magnesium oxychloride cement

Synthesis, Structure, and Thermal Stability of Magnesium Oxychloride 5Mg(OH)2∙MgCl2∙8H2O

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