Influence of Calcium Added Slag on the Strength and Water-Repellency of Magnesium Oxychloride Cement

Softening Coefficient ◽

The influence of dosage of calcium added slag on the strength and water-repellency of Magnesium oxychloride cement was studied in this paper. The results indicated that the compressive strength of magnesium oxychloride cement enhanced while the flexural strength remained unchanged when the dosage of calcium added slag between 5%-30%. The compressive strength of magnesium oxychloride cement was 110.0 MPa when the dosage of Calcium added slag was 20%, which increased the strength of 17%. The calcium added slag significantly improved the water-repellency of Magnesium oxychloride cement. The softening coefficient of magnesium oxychloride cement was more than 0.82, and the highest is 1.07.

Experimental Study on Desulfurized Gypsum Modified Magnesium Oxychloride Cement

10.4028/www.scientific.net/amr.236-238.1554 ◽

2011 ◽

Vol 236-238 ◽

pp. 1554-1558

Author(s):

Zhi Jie Zhang ◽

Tao Li ◽

Ping An Liu

Keyword(s):

Experimental Study ◽

Compressive Strength ◽

Flexural Strength ◽

Abrasion Loss ◽

Magnesium Oxychloride ◽

Abrasive Tools ◽

Softening Coefficient ◽

The influences of desulfurization gypsum on the properties of both Magnesium oxychloride cement (MOC) pastes and MOC abrasive tools were investigated in this study. By incorporating desulfurization gypsum in the MOC pastes, the compressive strength of MOC paste improved slightly. With 5% gypsum addition, the flexural strength of MOC pastes increased by 36%, the abrasion loss of MOC abrasive tools decreased by 35%, the strength softening coefficient greatly increased. The mechanism maybe due to the microstructure of the MOC pastes became more compact with gypsum adding, the rate of hydrolyzation reaction of MOC phases would be postponed.

Study on Phenolic Resin Modified Magnesium Oxychloride Cement

10.4028/www.scientific.net/amr.399-401.1358 ◽

2011 ◽

Vol 399-401 ◽

pp. 1358-1362 ◽

Cited By ~ 1

Author(s):

Zhi Jie Zhang ◽

Hong Ke Li ◽

Ping An Liu

Keyword(s):

Compressive Strength ◽

Flexural Strength ◽

Phenolic Resin ◽

Abrasion Loss ◽

Magnesium Oxychloride ◽

Abrasive Tools ◽

Softening Coefficient ◽

The influences of phenolic resin on the properties of both Magnesium oxychloride cement (MOC) pastes and MOC abrasive tools were investigated in this study. By incorporating phenolic resin in the MOC pastes,With 5% phenolic resin ,the compressive strength of MOC paste decreased by 26% , the flexural strength of MOC pastes decreased by 21%, the abrasion loss of MOC abrasive tools decreased by 37%, the strength softening coefficient greatly increased. The mechanism maybe due to the microstructure of the MOC pastes became more compact with phenolic resin adding, the rate of hydrolyzation reaction of MOC phases would be postponed.

Influence of Fly Ash on the Properties of Magnesium Oxychloride Cement

10.4028/www.scientific.net/amr.662.406 ◽

2013 ◽

Vol 662 ◽

pp. 406-408 ◽

Cited By ~ 2

Author(s):

Yu Jie Jin ◽

Li Guang Xiao ◽

Feng Luo

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Water Repellency ◽

Magnesium Oxychloride ◽

Softening Coefficient ◽

The influence of dosage of fly ash on the properties of magnesium oxychloride cement was studied in this paper. The results indicated that the compressive strength of magnesium oxychloride cement remained unchanged when the dosage of fly ash was 5%. The compressive strength of magnesium oxychloride cement declined when the dosage of fly ash between 10%-30%. Fly ash can enhance the water-repellency of magnesium oxychloride cement and the softening coefficient was about 0.90.

Influence of Admixture on the Properties of Magnesium Oxychloride Cement

10.4028/www.scientific.net/amr.662.402 ◽

2013 ◽

Vol 662 ◽

pp. 402-405

Author(s):

Yu Jie Jin ◽

Li Guang Xiao ◽

Feng Luo

Keyword(s):

Phosphoric Acid ◽

Water Repellency ◽

Magnesium Oxychloride ◽

Softening Coefficient ◽

The influence of phosphoric acid and iron vitriol on the properties of magnesium oxychloride cement is studied in this paper. The experiment indicated that phosphoric acid and iron vitriol can improve the water-repellency of magnesium oxychloride cement. The softening coefficient is about 1.014 when the dosage of phosphoric acid is 1% and the softening coefficient is about 0.77 when the dosage of iron vitriol is 4%.

Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride Cement

Materials ◽

10.3390/ma15020607 ◽

2022 ◽

Vol 15 (2) ◽

pp. 607

Author(s):

Chenggong Chang ◽

Lingyun An ◽

Rui Lin ◽

Jing Wen ◽

Jinmei Dong ◽

...

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Flexural Strength ◽

Calcination Temperature ◽

X Ray Diffraction ◽

X Ray ◽

Magnesium Oxychloride ◽

Scanning Electron ◽

In order to make full use of magnesium chloride resources, the development and utilisation of magnesium oxychloride cement have become an ecological and economic goal. Thus far, however, investigations into the effects on these cements of high temperatures are lacking. Herein, magnesium oxychloride cement was calcinated at various temperatures and the effects of calcination temperature on microstructure, phase composition, flexural strength, and compressive strength were studied by scanning electron microscopy, X-ray diffraction, and compression testing. The mechanical properties varied strongly with calcination temperature. Before calcination, magnesium oxychloride cement has a needle-like micromorphology and includes Mg(OH)2 gel and a trace amount of gel water as well as 5 Mg(OH)2·MgCl2·8H2O, which together provide its mechanical properties (flexural strength, 18.4 MPa; compressive strength, and 113.3 MPa). After calcination at 100 °C, the gel water is volatilised and the flexural strength is decreased by 57.07% but there is no significant change in the compressive strength. Calcination at 400 °C results in the magnesium oxychloride cement becoming fibrous and mainly consisting of Mg(OH)2 gel, which helps to maintain its high compressive strength (65.7 MPa). When the calcination temperature is 450 °C, the microstructure becomes powdery, the cement is mainly composed of MgO, and the flexural and compressive strengths are completely lost.

Study on EPS thermal insulation mortar prepared by magnesium oxychloride cement

E3S Web of Conferences ◽

10.1051/e3sconf/202019801016 ◽

2020 ◽

Vol 198 ◽

pp. 01016

Author(s):

Shiming Huang ◽

Wen Zhu ◽

Yanli Zhang ◽

Dehui Lu ◽

Ruying Zhao

Keyword(s):

Thermal Conductivity ◽

Compressive Strength ◽

Fly Ash ◽

Flexural Strength ◽

Mechanical Strength ◽

Thermal Insulation ◽

Magnesium Oxychloride ◽

In this paper, a composite thermal insulation mortar was prepared with magnesium oxychloride cement and polystyrene (EPS) particles. The influence of EPS particles content on the mechanical strength, density and thermal conductivity of composite thermal insulation mortar was studied. Also, the effect of fly ash on the density and thermal conductivity of the mortar was researched. It was shown that: (1) Generally, EPS particles could reduce the compressive strength, flexural strength, density and thermal conductivity of the mortar. The 28 days compressive strength and 28 days flexural strength decreased by 93.3 % and 81.3 % respectively, with the content of EPS particles from 0 % to 0.486 %. Also the density of the mortar was reduced from 2043 g/dm3 to 805 g/dm3, and the thermal conductivity was fell from 0.4093 W/(m·K) to 0.2191 W/(m·K). (2) Small amounts (less than 5.487 %) of fly ash could increase the density and thermal conductivity. However, when the content of fly ash was more than 5.487 %, the density and thermal conductivity of thermal insulation mortar were significantly reduced.

Marine sponge spicules-inspired magnesium oxychloride cement with both enhanced water resistance and compressive strength via incorporating acid-activated palygorskite

Applied Clay Science ◽

10.1016/j.clay.2020.105748 ◽

2020 ◽

Vol 196 ◽

pp. 105748 ◽

Cited By ~ 2

Author(s):

Yufei Han ◽

Qianqian Ye ◽

Yantao Xu ◽

Qiang Gao ◽

Wei Zhang ◽

...

Keyword(s):

Compressive Strength ◽

Marine Sponge ◽

Water Resistance ◽

Magnesium Oxychloride ◽

Sponge Spicules ◽

Improved Magnesium Cement for Durable Hemp Composite Boards

10.4028/www.scientific.net/cta.1.413 ◽

2022 ◽

Author(s):

Jelizaveta Zorica ◽

Maris Sinka ◽

Genadijs Sahmenko ◽

Diana Bajare

Keyword(s):

Compressive Strength ◽

Water Resistance ◽

Chemical Reactivity ◽

Ease Of Use ◽

Lower Amount ◽

Insulation Material ◽

Magnesium Oxychloride ◽

Cement Board ◽

Hemp concrete is a well-known bio-based building material, but due to its relatively low compressive strength is mainly used as an insulation material with a load-bearing wooden frame. There are possibilities to expand hemp concrete application in construction by substituting traditional lime with magnesium cement. Magnesium oxychloride cement is a material already known for some time and nowadays used in building board production. Strength, lightweight, ease of use are advantages that highlight relatively new magnesium oxychloride type boards compared to traditional sheeting materials such as plywood, gypsum plasterboard and fibre-cement board. Therefore, similar parameters are thought to be reached by producing magnesium oxychloride hemp board. In this work, magnesium cement water resistance was studied and possibilities to improve it was examined by adding fly ash and nanosilica. Among the nanomaterials used in building materials, nanosilica has gained significant interest by performing a beneficial effect in improving the mechanical properties of concretes. In addition, due to its ultrafine size and high chemical reactivity, the performance of nanosilica is much better with a lower amount of admixture required. Results show that applied nanosilica slightly reduced the compressive strength of magnesium cement in a dry state, but at the same time significantly increased its water resistance. Hemp magnesium oxychloride cement board prototype samples were produced and demonstrate promising results for further manufacturing of hemp composite boards.