Modification Research on the Water-Resistance of Magnesium Oxychloride Cement

2013 ◽  
Vol 423-426 ◽  
pp. 1027-1030 ◽  
Author(s):  
Zi Yao Yuan ◽  
Xing Long Liu ◽  
Yong Feng Jia ◽  
Peng Liu ◽  
Ming Chun Li
Keyword(s):  
Fly Ash ◽  
Phosphoric Acid ◽  
Glass Phase ◽  
Water Resistance ◽  
Dramatic Decrease ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Oxychloride Cement

The influences of fly ash and phosphoric acid on water-resistant property and the microstructure of magnesium oxychloride cement (MOC) were investigated in this paper. It is found that the improvement of the water-resistance of the MOC incorporated with phosphoric acid can be attributed to the dramatic decrease in the quantity of crystallization points. In addition, the new Mg2PO4(OH) phase can also prevent the dissolution of 5-phase. And the mechanism of the water-resistance of the MOC mixed with fly ash is due to the Ca2MgSi2O7 phase and the glass phase which are filled into microscopic cracks and skeleton empty.

Magnesium Oxychloride Cement Modified by Aluminum-Leached Coal Fly Ash

2012 ◽  
Vol 174-177 ◽  
pp. 1026-1029 ◽  
Author(s):  
Cheng You Wu ◽  
Hui Fang Zhang ◽  
Hong Fa Yu
Keyword(s):  
Fly Ash ◽  
Compression Strength ◽  
Water Resistance ◽  
Coal Fly Ash ◽  
Filling Material ◽  
High Compression ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Ash Residue ◽  
Oxychloride Cement

Effects of aluminum-leached coal fly ash residue on water-resistance, compression strength and efflorescence of MOC cement have been investigated. The results show that the compression strength of MOC cement curried for 28 days increases with the dosage of ACFAR. The water resistance of MOC cement can be improved obviously. This study has proved that aluminum-leached coal fly ash residue can be used as the filling material of MOC cement with high compression strength and good water-resistance.

Effect of hydroxyacetic acid on the water resistance of magnesium oxychloride cement

2020 ◽  
Vol 246 ◽  
pp. 118428 ◽  
Author(s):  
Xueru Luo ◽  
Wenqiang Fan ◽  
Chunqing Li ◽  
Yong Wang ◽  
Hongjian Yang ◽  
...  
Keyword(s):  
Water Resistance ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Hydroxyacetic Acid ◽  
Oxychloride Cement

Influence of Admixture on the Properties of Magnesium Oxychloride Cement

2013 ◽  
Vol 662 ◽  
pp. 402-405
Author(s):  
Yu Jie Jin ◽  
Li Guang Xiao ◽  
Feng Luo
Keyword(s):  
Phosphoric Acid ◽  
Water Repellency ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Softening Coefficient ◽  
Oxychloride Cement

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%.

Improved Magnesium Cement for Durable Hemp Composite Boards

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 ◽  
Magnesium Oxychloride Cement ◽  
Cement Board ◽  
Oxychloride Cement

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.

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