The role of phosphoric acid in improving the strength of magnesium oxychloride cement pastes with large molar ratios of H2O/MgCl2

2019 ◽  
Vol 97 ◽  
pp. 379-386 ◽  
Author(s):  
Tingjie Huang ◽  
Qiang Yuan ◽  
Dehua Deng
Keyword(s):  
Phosphoric Acid ◽  
Cement Pastes ◽  
Molar Ratios ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
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%.

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.

Reaction Products in Magnesium Oxychloride Cement Pastes. System MgO-MgCl2-H2O

1977 ◽  
Vol 60 (11-12) ◽  
pp. 504-507 ◽  
Author(s):  
BORIS MATKOVlC ◽  
STANKO POPOVIC ◽  
VINKO ROGIC ◽  
TONCI ZUNIC ◽  
J. FRANCIS YOUNG
Keyword(s):  
Reaction Products ◽  
Cement Pastes ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Oxychloride Cement

scholarly journals Environmental Assessment of Magnesium Oxychloride Cement Samples: A Case Study in Europe

2019 ◽  
Vol 11 (24) ◽  
pp. 6957 ◽  
Author(s):  
Gediminas Kastiukas ◽  
Shaoqin Ruan ◽  
Cise Unluer ◽  
Shuang Liang ◽  
Xiangming Zhou
Keyword(s):  
Portland Cement ◽  
Environmental Impacts ◽  
Construction Material ◽  
Dry Process ◽  
Molar Ratios ◽  
Process Route ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Reactive Magnesia ◽  
Oxychloride Cement

This study is the first in the literature to systematically assess the environmental impacts of magnesium oxychloride cement (MOC) samples, which are regarded as a more eco-friendly construction material than Portland cement. The environmental impacts of MOC samples prepared with various molar ratios of MgO/MgCl2∙6H2O and sources of reactive magnesia were obtained via a life cycle assessment (LCA) approach (from cradle to grave), and the obtained outcomes were further compared with the counterparts associated with the preparation of Portland cement (PC) samples. Meanwhile, a sensitivity analysis in terms of shipping reactive magnesia from China to Europe was performed. Results indicated that the preparation of MOC samples with higher molar ratios led to more severe overall environmental impacts and greater CO2 sequestration potentials due to the difference of energies required for the production of MgO and MgCl2∙6H2O as well as their various CO2 binding capacities, whereas in terms of CO2 intensities, the molar ratios in MOC samples should be carefully selected depending on the strength requirements of the applications. Furthermore, various allocation procedures and MgO production processes will greatly influence the final outcomes, and allocation by mass is more recommended. Meanwhile, the environmental impacts associated with the transportation of reactive magnesia from China to Europe can be ignored. Finally, it can be concluded that MOC concrete is no longer a type of ‘low-carbon’ binder in comparison with PC concrete in terms of CO2 emissions, and in view of the single scores and mixing triangles for weighing, MOC concrete can only be identified as a type of more sustainable binder than PC concrete when the main component MgO in MOC samples is obtained through the dry process route rather than the wet process route.

Characteristics of ammonia-soda residue and its reuse in magnesium oxychloride cement pastes

2021 ◽  
Vol 300 ◽  
pp. 123981
Author(s):  
Congbo Li ◽  
Yuhang Liang ◽  
Linfeng Jiang ◽  
Chuanmei Zhang ◽  
Qing Wang
Keyword(s):  
Cement Pastes ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Oxychloride Cement
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