Heat generation in the setting of magnesium oxychloride cements

Newman, Edwin S.; Gilfrich, John; Wells, L.S.

doi:10.6028/jres.049.040

Cited by 8 publications

(4 citation statements)

References 1 publication

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“…The potential formation of these higher-temperature phases was particularly highlighted by Newman et al, who studied the heat generation of MOCs using a formulation that was likely to generate the 5 phase (expected to be the most exothermic). The internal sample temperature reached 147 °C, with a deleterious effect on strength.…”

Section: Magnesium Oxychloride (Sorel) Cementsmentioning

confidence: 99%

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: Magnesium Oxychloride (Sorel) Cementsmentioning

confidence: 99%

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

2016

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“…Such a calculation was made for a paste made of 40 percent of MgO and 60 percent of 22° B MgClz solution, a composition approximat.ing those used in actual practice. The X-ray pattern of such a paste showed that at 254 days it consisted of the 5:1 oxychloride and Mg (OH)2' The observed heat of hardening [18] was 235 cal/g MgO at 60 da,ys. The potential heat of hardening cal culated, based on the formation of Mg (OH)2, the 5: 1 oxychloride, and 10.89 percent MgC12 solution, was 265 cal/g of MgO.…”

Section: Heat Of Harden Ing Of Magnesium Oxychloride Cementmentioning

confidence: 97%

A study of the system magnesium oxide-magnesium chloride-water and the heat of formation of magnesium oxychloride

Newman¹

1955

J. RES. NATL. BUR. STAN.

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The precipitation of magnesium oxychlorides is di scussed , and the results of ~o l ubi li t y meas ure ments are given . T he heats of solu t ion in H CI, 26·61H, O (2.00 N H CI at 25° C) of four co mpounds in t he system :VIgO-MgCI,-H ,O were determi ned . From those data a nd other data taken from t he literatu re, t he heats of fonnation of t he compo unds at 25° C were calculated . The results are a pplied to t he calcu lation of t he heat of reaction of hardenin g of magnesiu m oxyc hlorid e cem en t.

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“…It was suggested that this was also true of the 5 phase, proposed to exist essentially as a metastable phase at room temperature, before stabilizing as the 3 phase. 302 The potential formation of these higher-temperature phases was particularly highlighted by Newman et al, 303 who studied the heat generation of MOCs using a formulation that was likely to generate the 5 phase (expected to be the most exothermic). The internal sample temperature reached 147°C, with a deleterious effect on strength.…”

Section: Phase Compositionmentioning

confidence: 99%

Microanalysis of Primary Biological Particles from Model Grass over Its Life Cycle

China

Veghte

Ahkami

et al. 2020

ACS Earth Space Chem.

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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 CO 2 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. CONTENTS 1. Introduction 4170 1.1. Cements Based on MgO 4171 1.2. Magnesia Production 4171 2. Magnesium Carbonate and Reactive Magnesia Cements 4173 2.1. Reactive Magnesia 4173 2.2. Expansive MgO Cements 4173 2.3. Development of Reactive Magnesia Cements 4174 2.4. Carbonated Magnesia (MgO) Blocks 4176 2.5. Novacem 4177 2.6. Limitations of Carbon Sequestration 4177 2.7. Conclusions 4178 3. Magnesium Phosphate Cements 4178 3.1. Phosphate Bonding of MgO 4178 3.2. Application as Cements 4179 3.3. Method of Action 4179 3.4.

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Heat generation in the setting of magnesium oxychloride cements

Cited by 8 publications

References 1 publication

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?

A study of the system magnesium oxide-magnesium chloride-water and the heat of formation of magnesium oxychloride

Microanalysis of Primary Biological Particles from Model Grass over Its Life Cycle

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