Water-to-Cement Ratio of Magnesium Oxychloride Cement Foam Concrete with Caustic Dolomite Powder

Zheng, Weixin; Xiao, Xueying; Wen, Jing; Chang, Chenggong; An, Shi; Dong, Junping

doi:10.3390/su13052429

Cited by 16 publications

(5 citation statements)

References 33 publications

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“…In other words, the lower the water content, the higher the bonding shear strength of the MOC binder. 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 ].…”

Section: Resultsmentioning

confidence: 99%

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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%

“…The curing of MOC at different temperatures between 0 °C and 65 °C was also investigated. It was shown that the curing at temperatures between 20 °C and 50 °C resulted in the most stable MOC under humid conditions [ 25 ]. When curing occurs at a higher temperature, a certain amount of unreacted MgO remains in the system [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

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 brine content of MOC changes with the incorporation of caustic dolomite powder. The study of Zheng et al [39] in this special issue investigated the relationship between the mass percent concentration and the Baumé degree of a magnesium chloride solution after bischofite (MgCl 2 •6H 2 O) from a salt lake was dissolved in water. Then the proportional relationship between the amount of water in brine and bischofite and the functional formula for the water-to-cement ratio (W/C) of MOC mixed with caustic dolomite powder were deduced.…”

Section: Overview Of This Special Issuementioning

confidence: 99%

Sustainable High-Performance Hydraulic Concrete

et al. 2022

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“…Ordinary Portland cement, quick-hardening Portland cement, sulfate-resistant Portland cement, and high alumina cement can be used as a binder in foam concrete and as additional materials to replace part of the cement in the range from 10% to 70% in place of materials such as microsilica, fly ash, lime, ground granulated blast-furnace slag, and others. As a rule, various additional components in addition to the main raw material are used to improve the mechanical and physical characteristics [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Table 2 provides an overview of various ways to modify and improve the physical–mechanical characteristics by introducing additional components.…”

Section: Introductionmentioning

confidence: 99%

Insulation Foam Concrete Nanomodified with Microsilica and Reinforced with Polypropylene Fiber for the Improvement of Characteristics

et al. 2022

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Some of the primary problems of construction are brittleness and low the mechanical properties of good thermal insulation materials. Heat-insulating foam concrete has a low thermal conductivity. However, it is practically impossible to transport it over long distances since corners are cracked during transportation, the structure is broken, and, in principle, the fragility of this material is a big problem for modern buildings. The purpose of this study was to develop a heat-insulating foam concrete with improved characteristics by experimentally selecting the optimal dosage of polypropylene fiber and a nanomodifying microsilica additive. Standard methods for determining the characteristics of fiber foam concrete were used as well as the method of optical microscopy to study the structure of the composite. It has been established that the use of polypropylene fiber with the optimal reinforcement range from 1% to 3% allows us to achieve an improvement in the mechanical and physical characteristics of fiber foam concrete. The optimal dosage of the nanomodifier introduced instead of a part of the binder (10%) and polypropylene fiber (2%) by weight of the binder was determined. The maximum values of increments in mechanical characteristics were 44% for compressive strength and 73% for tensile strength in bending. The values of the thermal conductivity coefficient at optimal dosages of the nanomodifier and fiber decreased by 9%. The absence of microcracking at the phase boundary between the polypropylene fiber and the hardened cement–sand matrix due to nanomodification was noted.

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Water-to-Cement Ratio of Magnesium Oxychloride Cement Foam Concrete with Caustic Dolomite Powder

Cited by 16 publications

References 33 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

Sustainable High-Performance Hydraulic Concrete

Insulation Foam Concrete Nanomodified with Microsilica and Reinforced with Polypropylene Fiber for the Improvement of Characteristics

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