Magnesium Oxychloride Cement Composites with MWCNT for the Construction Applications

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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Co-Doped Magnesium Oxychloride Composites with Unique Flexural Strength for Construction Use

Materials ◽

10.3390/ma15020604 ◽

2022 ◽

Vol 15 (2) ◽

pp. 604

Author(s):

Anna-Marie Lauermannová ◽

Ondřej Jankovský ◽

Michal Lojka ◽

Ivana Faltysová ◽

Julie Slámová ◽

...

Keyword(s):

Water Resistance ◽

Structural Parameters ◽

Reference Sample ◽

Construction Materials ◽

X Ray Diffraction ◽

Multi Walled Carbon Nanotubes ◽

Magnesium Oxychloride ◽

Phase And Chemical Composition ◽

New Generation ◽

Walled Carbon Nanotubes

In this study, the combined effect of graphene oxide (GO) and oxidized multi-walled carbon nanotubes (OMWCNTs) on material properties of the magnesium oxychloride (MOC) phase 5 was analyzed. The selected carbon-based nanoadditives were used in small content in order to obtain higher values of mechanical parameters and higher water resistance while maintaining acceptable price of the final composites. Two sets of samples containing either 0.1 wt. % or 0.2 wt. % of both nanoadditives were prepared, in addition to a set of reference samples without additives. Samples were characterized by X-ray diffraction, scanning electron microscopy, Fourier-transform infrared spectroscopy, and energy dispersive spectroscopy, which were used to obtain the basic information on the phase and chemical composition, as well as the microstructure and morphology. Basic macro- and micro-structural parameters were studied in order to determine the effect of the nanoadditives on the open porosity, bulk and specific density. In addition, the mechanical, hygric and thermal parameters of the prepared nano-doped composites were acquired and compared to the reference sample. An enhancement of all the mentioned types of parameters was observed. This can be assigned to the drop in porosity when GO and OMWCNTs were used. This research shows a pathway of increasing the water resistance of MOC-based composites, which is an important step in the development of the new generation of construction materials.

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GRAPHENE- AND GRAPHITE OXIDE-REINFORCED MAGNESIUM OXYCHLORIDE CEMENT COMPOSITES FOR THE CONSTRUCTION USE

Ceramics - Silikaty ◽

10.13168/cs.2020.0040 ◽

2020 ◽

pp. 1-9

Author(s):

Anna-Marie Lauermannova

Keyword(s):

Graphite Oxide ◽

Cement Composites ◽

Magnesium Oxychloride ◽

Magnesium Oxychloride Cement ◽

Oxychloride Cement

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Effects of an Inorganic Additive on the Interfacial Properties of Glass-Fiber / Magnesium-Oxychloride Cement Composites

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.249.363 ◽

2003 ◽

Vol 249 ◽

pp. 363-366 ◽

Cited By ~ 1

Author(s):

Y.D. Zhu ◽

Jing He Wang ◽

Rui Weng ◽

X.M. Li

Keyword(s):

Glass Fiber ◽

Interfacial Properties ◽

Cement Composites ◽

Magnesium Oxychloride ◽

Magnesium Oxychloride Cement ◽

Oxychloride Cement

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Effect of EVA Emulsion on the Properties of Corn Stalk Magnesium Oxychloride Cement Composites

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.863.71 ◽

2017 ◽

Vol 863 ◽

pp. 71-77

Author(s):

Si Qi Li ◽

Ying Liang Tian ◽

Chang Wei Xu ◽

Jian Heng Wang ◽

Shi Bing Sun ◽

...

Keyword(s):

Mechanical Properties ◽

Thermal Conductivity ◽

Water Absorption ◽

Water Resistance ◽

Cement Composites ◽

Corn Stalk ◽

Coefficient Of Thermal Conductivity ◽

Magnesium Oxychloride ◽

Magnesium Oxychloride Cement ◽

Oxychloride Cement

By the method of EVA emulsion coating, cron stalk-magnesium oxychloride cement composites (C-MOC) was modified to study the effect of EVA emulsion content on C-MOC density, the coefficient of thermal conductivity, water resistance and mechanical properties. Furthermore microstructure of C-MOC was analyzed by SEM. The results show that: with the increase of EVA emulsion content, the coefficient of thermal conductivity and softening of C-MOC increase, but water absorption reduces. When the content is 80%, the flexural strength after 28 days could reach 3.65 MPa and the compressive strength is 4.69 MPa, reaching the maximum. At the same time, C-MOC density is 816 kg/m3 and thermal conductivity is 0.111 W/(m·k). Water absorption is 36% and softening coefficient was 0.47. It is believed that EVA emulsion could form a thin film on the outer surface of the corn stalk by microscopic analysis, increasing the roughness of the straw surface and reducing the gap between the stalk. Since the EVA emulsion has good compatibility with the magnesium oxychloride cement, they could constitute a whole jointly with glue liquid, crystal and fiber, playing the role of enhancing the surface. Therefore, water resistance, thermal conductivity and mechanical properties of C-MOC have been improved effectively.

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