Effect of Molar Ratios and Curing Conditions on the Moisture Resistance of Magnesium 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.

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Influence of Inert Filler on Cementing Properties of Magnesium Oxychloride Cement Moc With MOC-Friendly Cement

Indian Journal Of Applied Research ◽

10.15373/2249555x/oct2013/17 ◽

2011 ◽

Vol 3 (10) ◽

pp. 1-3

Author(s):

R N Yadav R N Yadav ◽

◽

Upendra Singh ◽

Priyanka Gupta ◽

Madhu Sharma

Keyword(s):

Inert Filler ◽

Magnesium Oxychloride ◽

Magnesium Oxychloride Cement ◽

Oxychloride Cement

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Development of magnesium oxychloride cement with enhanced water resistance by adding silica fume and hybrid fly ash-silica fume

Journal of Cleaner Production ◽

10.1016/j.jclepro.2021.127682 ◽

2021 ◽

pp. 127682

Author(s):

Yingying Guo ◽

Y.X. Zhang ◽

Khin Soe ◽

Richard Wuhrer ◽

Wayne D. Hutchison ◽

...

Keyword(s):

Fly Ash ◽

Silica Fume ◽

Water Resistance ◽

Magnesium Oxychloride ◽

Magnesium Oxychloride Cement ◽

Oxychloride Cement

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Magnesium Oxychloride Cement Composites with MWCNT for the Construction Applications

Materials ◽

10.3390/ma14030484 ◽

2021 ◽

Vol 14 (3) ◽

pp. 484

Author(s):

Michal Lojka ◽

Anna-Marie Lauermannová ◽

David Sedmidubský ◽

Milena Pavlíková ◽

Martina Záleská ◽

...

Keyword(s):

Structural Parameters ◽

Mechanical Resistance ◽

Cement Composites ◽

Multi Walled Carbon Nanotubes ◽

The Subject ◽

Magnesium Oxychloride ◽

Magnesium Oxychloride Cement ◽

Phase And Chemical Composition ◽

Walled Carbon Nanotubes ◽

Oxychloride Cement

In this contribution, composite materials based on magnesium oxychloride cement (MOC) with multi-walled carbon nanotubes (MWCNTs) used as an additive were prepared and characterized. The prepared composites contained 0.5 and 1 wt.% of MWCNTs, and these samples were compared with the pure MOC Phase 5 reference. The composites were characterized using a broad spectrum of analytical methods to determine the phase and chemical composition, morphology, and thermal behavior. In addition, the basic structural parameters, pore size distribution, mechanical strength, stiffness, and hygrothermal performance of the composites, aged 14 days, were also the subject of investigation. The MWCNT-doped composites showed high compactness, increased mechanical resistance, stiffness, and water resistance, which is crucial for their application in the construction industry and their future use in the design and development of alternative building products.

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