Preparation and heat of formation of a magnesium oxysulfate

Newman, Edwin S.

doi:10.6028/jres.068a.064

Cited by 14 publications

(4 citation statements)

References 9 publications

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“…The two low temperature peaks have been attributed to the dehydration of 3 Mg(0H) 2. MgSOt, .8H20 (3) . The large peak at 475OC is due to the decomposition of Mg(OH)2.…”

Section: Resultsmentioning

confidence: 99%

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Strength development in magnesium oxysulfate cement

Beaudoin

Ramachandran

1978

Cement and Concrete Research

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/0008-8846(78) Cement and Concrete Research, 8, 1, pp. 103-112, 1978-01-01 Strength development in magnesium oxysulfate cement Beaudoin, J. J.; Ramachandran, V. S. ABSTRACT: Modulus of elasticity and microhardness measurements were made on magnesium oxysulfate systems (paste and compacted) having a wide ranCe of porosity. Three sets of compacts were made; each set was made with particles having a different size range (5 to 150 pm; 150 to 300 urn; 300 to 600 pm). The log mechanical property versus porosity curves for paste samples were linear. The curves for compacted samples had a change in slope at 7.5 per cent porosity. At porosities less than 7.5 per cent, the data for paste and compacted samples were on the same curve. At higher porosities microhardness values for compacted samples were greater than those for paste samples; modulus of elas ticity values were less. Compacted samples made with finest particles had higher values for mechanical properties at a given porosity. NATIONAL RESEARCH COUNCIL OFThe mechanical behaviour of these systems was explained on the basis of the relative contribution of porosity, pore size dis tribution, interparticle bonds and strength of the solid phase.Des mesures du module d161asticitE et de la microduretg ont Et6 prises sur de l'oxysulfate de magnEsium (en pzte et comprim6) ayant une porositE trSs vari6e. Trois ensembles de comprimEs ont 6tE fabriqugs; chacun a EtE fait de trois s6ries de particules de grosseur diffErente (5 b 100 pm; 150 b 300 um; 300 b 600 um). Les courbes de propri6tE m6canique logarithmique et de porosit6 des Echantillons en pzte 6taient lin6aires. Les courbes des Echantillons comprim6s avaient un changement d'inclinaison b 7.5 pour cent de porosit6. A des porositEs moindres que 7.5 pour cent les donn6es des Echantillons en pzte et comprim6s se situaient sur la mgme courbe. Les valeurs de microduretE des 6chantillons comprim6s b des porositEs plus 6levEes Etaient plus grandes que celles des Echan tillons en pzte ; les valeurs du mdule d' Elas tici t6 Etaient moindres . Les Echantillons comprim6s fait s avec les particules les plus fines avaient des propri6tEs m6caniques de valeurs plus grandes b une porosit6 donn6e. Le comportement mEcaniqw de ces systsmes a 6tE expliqu6 en se fondant sur la contribution rel...

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“…The two low temperature peaks have been attributed to the dehydration of 3 Mg(0H) 2. MgSOt, .8H20 (3) . The large peak at 475OC is due to the decomposition of Mg(OH)2.…”

Section: Resultsmentioning

confidence: 99%

“…MgS04. 5H20 and Mg(0H)2.2MgSO4.3H20 (2,3). At temperatures below 3S°C, 3Mg(OH)2.MgS04.8H20 appears to be the most stable phase (3).…”

Section: Introductionmentioning

confidence: 99%

Strength development in magnesium oxysulfate cement

Beaudoin

Ramachandran

1978

Cement and Concrete Research

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“…Due to outstanding properties of light weight ,good fire-resistance, good protections to steel and low thermal conductivity [1,2] , it can be widely used in producing light insulation board ,electrical insulating materials and fire-proofing materials.…”

Section: Introductionmentioning

confidence: 99%

Influences of Mineral Admixture On the Comressive strength of Magnesium Oxysulphate Cement

Chen¹,

Wu²,

Yu³

et al. 2016

Proceedings of the 2016 5th International Conference on Energy and Environmental Protection (ICEEP 2016)

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“…Depending on the conditions of formation, four types of oxysulfate complexes are known to form (2,3). These are: 5Mg(OH)2.MgS04.3H20 (or .…”

Section: Introductionmentioning

confidence: 99%

The flow of helium into the microspaces of magnesium oxysulfate cement paste

Beaudoin

Feldman

1977

Cement and Concrete Research

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/0008-8846(77)90120-X Cement and Concrete Research, 7, 5, pp. 585-96, 1977-09-01 The flow of helium into the microspaces of magnesium oxysulfate cement paste Beaudoin, J. J.; Feldman, R. F. ABSTRACT Helium flow measurements were made on samples of magnesium oxysulfate cement paste initially conditioned at 11% R.H. and dried in stages by combinations of pumping and heating. Physical changes in the microstructure of the cement paste due to chemical decomposition and water removal were monitored. It was concluded that helium can penetrate the microspaces of magnesium oxysulfate cement paste which form during removal of structural water. It appears that helium also enters discrete pores (unfilled with water) that become accessible when the cement paste is heated to 200°C. Mercury (at 407 MPa) can intrude into those microspaces not initially accessible to helium. Collapse of structure occurs when water is removed from this system. An estimate of the density of the water removed up to 15% weight change was 1.21 + 0.07 g/ec. NATIONAL RESEARCH COUNCIL OF CANADA OONSEIL NATIONAL DE RECHERCHES DUDes mesures du flux d'h6lium ont 6t6 pratiqu6es sur des 6chantillons de. pBte de ciment d'oxysulfate de magn6sium conditionngs initialement 2 11% HR et s6ch6s par 6tapes en op6rations d'ensemble de pompage et de chauffage. Des changements physiques dans la microstructure de la pste de ciment caus6s par la d6composition chimique et l'enlsvement de l'eau ont 6t6 observ6s. I1 a 6t6 conclu que l'h6lium peut p6n6trer dans les vides microscopiques de la pzte de ciment d'oxysulfate de magn6sium q11i se produisent en enlevant l'eau structurale. I1 apparait que l'h6lium entre aussi dans les petits pores (vides d'eau) qui deviennent accessibles lorsque la pzte de ciment est chauff6e ii 200"~. Le mercure (2 407 MPa) peut s'introduire dans ces vides microscopiques qui ne sont pas au d6part accessibles 5 l'h6lium. L'effondrement des structures se produit lorsque l'eau est retir6e de ce systsme. Une 6valuation de la densit6 de l'eau enlev6e jusqu'ii 15% du changement de poids 6tait 1.21 + 0.07 ~/cc.

show abstract

Preparation and heat of formation of a magnesium oxysulfate

Cited by 14 publications

References 9 publications

Strength development in magnesium oxysulfate cement

Strength development in magnesium oxysulfate cement

Influences of Mineral Admixture On the Comressive strength of Magnesium Oxysulphate Cement

The flow of helium into the microspaces of magnesium oxysulfate cement paste

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