Super-hydrophobic magnesium oxychloride cement (MOC): from structural control to self-cleaning property evaluation

Qu, Zhengyao; Wang, Fazhou; Liu, Peng; Yu, Qingliang; Brouwers, Hjh Jos

doi:10.1617/s11527-020-01462-3

Cited by 35 publications

(13 citation statements)

References 35 publications

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“…Characteristics of the porous structure of peat particles [9][10][11] make it possible to saturate the system with various types of traditional hydrophobic agents: bitumen [12], oleic acid, organosilicon compounds, etc. [13,14]. This peat-based powder retains its flowability at sufficiently high concentrations of water repellents (experimentally confirmed the concentration of up to 20%).…”

Section: Introductionmentioning

confidence: 79%

Technological Scheme of Complex Peat Processing for Obtaining of Multifunctional Hydrophobic and Hydrophilic Powders

Misnikov

2020

E3S Web Conf.

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The method of hydrophobic modification of dispersed materials is based on the extraction of bituminous components of peat and applying them to a treated surface. The industrial implementation of this method is possible in the following main directions. First, it is the thermochemical treatment in a reactor of the entire material volume by hydrophobic components of peat with a low concentration. Second, it is the obtaining of concentrated hydrophobically-modifying compositions and their use in the production technology of various types of powdered dispersed materials. Positive results were obtained with organo-mineral hydrophobically- modifying concentrates based on peat with clinker, kaolin, chalk, lime, vermiculite. Third, it is the use of the sorption properties of the porous structure of peat to saturate it with additional hydrophobic components: bitumen, oleic acid, organosilicon compounds, etc. The main advantage of the obtained composite hydrophobic modifiers is quality (accurate) dosing. There are promising directions of the use of hydrophobically-modifying additives in the construction industry, chemical industry and to ensure fire safety. A block diagram of the technological process of complex peat processing to produce hydrophobic and hydrophilic powders is proposed. Additional processing of production wastes allows for the production of a stabilizing additive for asphalt concrete.

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Section: Introductionmentioning

confidence: 79%

Technological Scheme of Complex Peat Processing for Obtaining of Multifunctional Hydrophobic and Hydrophilic Powders

Misnikov

2020

E3S Web Conf.

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“…Concerning the strength development, preceding research has shown the significant increase in the compressive strength in the first seven days of curing. The value of compressive strength after this period did not increase much more, showing the material has fully developed [ 30 , 31 , 32 ]. Another advantage of MOC is its lower environmental impact during the life cycle compared to PC.…”

Section: Introductionmentioning

confidence: 99%

Foam Glass Lightened Sorel’s Cement Composites Doped with Coal Fly Ash

et al. 2021

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Lightweight Sorel’s cement composites doped with coal fly ash were produced and tested. Commercially available foam granulate was used as lightening aggregate. For comparison, reference composites made of magnesium oxychloride cement (MOC) and quartz sand were tested as well. The performed experiments included X-ray diffraction, X-ray fluorescence, scanning electron microscopy, light microscopy, and energy dispersive spectroscopy analyses. The macro- and microstructural parameters, mechanical resistance, stiffness, hygric, and thermal parameters of the 28-days matured composites were also researched. The combined use of foam glass and fly ash enabled to get a material of low weight, high porosity, sufficient strength and stiffness, low water imbibition, and greatly improved thermal insulation performance. The developed lightweight composites can be considered as further step in the design and production of alternative and sustainable materials for construction industry.

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“…Magnesium oxychloride cement (MOC) was invented by French scientist Sorell and belongs to the category of special cement [ 1 , 2 , 3 ]. The main hydration products of MOC at room temperature are Phase 5 [5Mg(OH) 2 ·MgCl 2 ·8H 2 O] and Phase 3 [3Mg(OH) 2 ·MgCl 2 ·8H 2 O] [ 3 ]. The main raw materials for producing MOC are light burned magnesium oxide and halogen tablets [MgCl 2 ·6H 2 O].…”

Section: Introductionmentioning

confidence: 99%

“…However, the water resistance of MOC is very poor [ 1 , 2 , 3 ]. The strength of MOC decreases sharply after continuous exposure to water, which seriously affects its use.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Superhydrophobic Coating on the Water Resistance of Foundry Dust/Magnesium Oxychloride Cement Composite

et al. 2020

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In this work, magnesium oxychloride cement (MOC) was used to realize the resource use of foundry dust (FD). Portland cement (PC)-based superhydrophobic coating was prepared on the surface of FD/MOC composite to improve the water resistance of the composite. First, the FD/MOC composites with different contents of FD were prepared. The phase structure of the composite was analyzed using X-ray diffraction (XRD). The microstructure of the cross-section and surface of the composite was observed using field emission scanning electron microscope (FE-SEM). The mechanical properties of the FD/MOC composites with different FD contents at different ages were tested and analyzed. Secondly, the superhydrophobic coating was prepared on the surface of MOC composite using silane/siloxane aqueous emulsion as the hydrophobic modifier, PC as the matrix and water as the solvent. The microstructure and chemical composition of the PC-based superhydrophobic coating were tested and analyzed. The results show that FD can significantly improve the early strength of the FD/MOC composite. The 28-day compressive strength of the FD/MOC composite decreases with increasing FD content. When the FD content is 30%, the 28-day compressive strength of the FD/MOC composite is as high as 75.68 MPa. Superhydrophobic coating can effectively improve the water resistance of the FD/MOC composite. The softening coefficient of the FD/MOC composite without superhydrophobic coating is less than 0.26, while that of the composite modified by superhydrophobic coating is greater than 0.81.

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Super-hydrophobic magnesium oxychloride cement (MOC): from structural control to self-cleaning property evaluation

Cited by 35 publications

References 35 publications

Technological Scheme of Complex Peat Processing for Obtaining of Multifunctional Hydrophobic and Hydrophilic Powders

Technological Scheme of Complex Peat Processing for Obtaining of Multifunctional Hydrophobic and Hydrophilic Powders

Foam Glass Lightened Sorel’s Cement Composites Doped with Coal Fly Ash

Influence of Superhydrophobic Coating on the Water Resistance of Foundry Dust/Magnesium Oxychloride Cement Composite

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