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

Aiken, Timothy A.; Russell, Mark; McPolin, Daniel; Gavin, Brian J.; Nugent, Liam; Bagnall, Leo

doi:10.1061/(asce)mt.1943-5533.0004070

Cited by 14 publications

(11 citation statements)

References 36 publications

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“…Some of these peaks disappeared or their intensity decreased when the M/C molar ratio was increased from 6 to 12 and the W/C molar ratio was decreased from 21 to 15. Excess MgO and H 2 O in the binder could lead to the formation of Mg(OH) 2 , resulting in instability and a possible reduction in binder strength [ 23 ]. The bands at 3300 to 3500 cm −1 and at 1624 cm −1 can be attributed to the O-H bending vibrations and H-O-H bending moment of the crystal water, respectively [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

“…This was because the excess H 2 O reacted more with MgO, resulting in a higher content of Mg(OH) 2 , which reduced the strength of the binder [ 25 ]. Excess water could also have caused pores and contributed to the observed reduction in strength [ 23 ]. It is also conceivable that the binder with lower solids content (higher W/C molar ratio) penetrated more into the wood cells/cavity structure and resulted in a weak glue joint (starved glue joint) [ 14 , 15 , 29 ].…”

Section: Resultsmentioning

confidence: 99%

“…It has been stated that the ratio of components in the MOC binder plays an important role on the characteristics of the final hydrated product [ 22 ]. The effects of molar ratios (MgO/MgCl 2 and H 2 O/MgCl 2 ) and curing conditions on MOC were investigated [ 23 ]. The results show that the use of appropriate molar ratios and curing conditions can significantly improve the MOC features [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of Mineral-Bonded Plywood with Magnesium Oxychloride as a Binder Using the Hot-Pressing Process

Shalbafan

Thoemen

2023

Polymers

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Environmentally friendly plywood panels were produced by a hot-pressing process using magnesium oxychloride cement (MOC) as a no-added formaldehyde adhesive. Magnesium oxychloride cement binders were prepared with different molar ratios of MgO:MgCl2 (M/C) and H2O:MgCl2 (W/C) ranging from 6 to 12 and 15 to 21, respectively, for plywood production. The binder properties measured were gel time, differential scanning calorimetry (DSC) and Fourier transom infrared spectroscopy (FTIR). The quality of the plywood panels was analyzed based on their mechanical (shear and bending) and physical (thickness swelling and water absorption) properties. A positive effect on the properties of the MOC binder as well as on the properties of the plywood was observed by increasing the molar ratio M/C up to a value of 9. The shear and flexural properties of the plywood specimens were negatively affected by further increasing the molar ratio M/C to 12 and the molar ratio W/C from 15 to 21. Differential scanning calorimetry analysis showed a peak temperature of less than 100 °C for MOC curing, which meets the requirements of hot press technology. No delamination of the plywood specimens was observed after 24 h immersion in tap water or 6 h immersion in boiling water and after a cyclic delamination test. In general, mineral-bonded plywood with magnesium oxychloride shows promising properties for indoor and outdoor use, although the binder quality should still be improved.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of Mineral-Bonded Plywood with Magnesium Oxychloride as a Binder Using the Hot-Pressing Process

Shalbafan

Thoemen

2023

Polymers

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“…The main advantages that make the MOC cement superior to ordinary cement are referring to lower CO 2 emission, short setting time, the lack of humid curing, low alkalinity and excellent mechanical strength [ 16 ]. Because the phase composition could be regulated through adjusting the molar ratio of precursor [ 17 , 18 ], MOC cement provides a series of promising cementitious substrates [ 19 ]. Furthermore, it exhibits rheological properties that enable the material to flow into irregular cavities [ 20 ].…”

Section: Background Of Magnesium Oxychloride Cement (Moc)mentioning

confidence: 99%

Perspective of Using Magnesium Oxychloride Cement (MOC) and Wood as a Composite Building Material: A Bibliometric Literature Review

Maier

Manea

2022

Materials

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The building industry is known as one of the biggest consumers of natural resources and an important producer of CO2 emissions. The biggest greenhouse gas emissions are recorded in the production of cement and metallic building materials. The purpose of this paper is to investigate if magnesium oxychloride cement (MOC) can be used as an alternative to the ordinary Portland cement in the mixture of wood–cement composite building materials in order to decrease the negative impact of the construction industry on the environment. The research methodology includes bibliometric literature research, a scientometric analysis and an in-depth discussion. The data used for the research were obtained by interrogating the ISI Web of Science database, selected using the guidelines of the PRISMA method and processed with the help of VOSviewer and Bibliometrix software. The research results indicate an increasing interest in this topic; for example, in the last five years, three times more articles were published on the subject of MOC cement than the number of all articles collected in previous years. Compared to ordinary Portland cement, MOC cement presents a good match with wood, so MOC can be a substitute for ordinary cement to manufacture wood-cement particleboard, especially for the wood species that have high incompatibility with ordinary cement.

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“…Magnesium oxychloride cement (MOC) is an environment-friendly magnesia cementitious material prepared by lightly burning magnesium oxide, magnesium chloride and water [15]. Due to its fast-setting speed, high mechanical strength, good wear resistance, salt resistance and halogen corrosion, simple production process, and low cost, it is widely used in construction materials, biological materials, and other fields [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Study on Properties of Magnesium Oxychloride Cement Solidified Soil

Wang

Zhang²,

Yan

et al. 2022

Advances in Materials Science and Engineering

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Due to the poor performance of ordinary Portland cement (OPC) as a solidified soil road and the large pollution in the production process, environment-friendly magnesium oxychloride cement (MOC) was used as the soil curing agent to prepare the solidified soil, exploring the optimal ratio of various raw materials when MOC is used as a curing agent. Analyzing the properties of MOC solidified soil in the application of road subgrade. This paper tests compaction, mechanical properties, and durability of the MOC solidified soil, simulates the development trend of 7 days unconfined compressive strength of MOC solidified soil, and then analyzes the hydration process and strengthens the formation mechanism of MOC in solidified soil. The study found that the addition of MOC as a curing agent to the soil can effectively improve the compaction and mechanical properties of the soil. Matlab simulation found that when the MgO content is 5.5% to 6% and the ratio of raw materials MgO, MgCl2, and H2O is 2.45 : 1 : 14 to 6.3 : 1 : 14, the performance of MOC solidified soil is excellent. Fitting UCS data, it is found that MOC solidified soil has early strength characteristics. The excellent compaction and mechanical properties of MOC solidified soil are due to the formation of a small amount of phase 5 and layered Mg(OH)2 by the hydration of MOC, and the formation of amorphous gel with SiO2 in the soil. This reaction improves soil compaction and reduces internal porosity from a microscopic perspective. The strength loss rate of MOC solidified soil is higher after immersion in water at the initial stage of curing, but it is still better than that of traditional cement-based solidified soil. Poor performance after immersion in water is associated with disruption of the network-like structure. As an environment-friendly soil curing agent, MOC can be used in engineering practice with low environmental humidity.

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

Cited by 14 publications

References 36 publications

Development of Mineral-Bonded Plywood with Magnesium Oxychloride as a Binder Using the Hot-Pressing Process

Development of Mineral-Bonded Plywood with Magnesium Oxychloride as a Binder Using the Hot-Pressing Process

Perspective of Using Magnesium Oxychloride Cement (MOC) and Wood as a Composite Building Material: A Bibliometric Literature Review

Study on Properties of Magnesium Oxychloride Cement Solidified Soil

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