Hygric properties of porous building materials (VI): A round robin campaign

Feng, Chi; Guimarães, Ana Sofia; Ramos, Nuno M. M.; Sun, Li Gen; Gawin, Dariusz; Konca, Piotr; Hall, Christopher; Zhao, Jianhua; Hirsch, Hauke; Grunewald, John; Fredriksson, Maria; Hansen, Kathleen A.; Pavlík, Zbyšek; Hamilton, Alister; Janssen, Hans

doi:10.1016/j.buildenv.2020.107242

Cited by 52 publications

(26 citation statements)

References 32 publications

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“…Quantitatively, the water absorption coefficient was low for all tested samples, which is favorable for the durability of the composites with respect to their deterioration in the presence of water and reactive MgO. Capillary active materials have the water absorption coefficient typically about one order of magnitude higher [ 21 , 22 , 23 ] than measured for MOC-based derivatives examined in this work.…”

Section: Resultsmentioning

confidence: 71%

MOC-Diatomite Composites Filled with Multi-Walled Carbon Nanotubes

et al. 2021

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The studies focusing on magnesium oxychloride cement (MOC) composites have recently become fairly widespread because of MOC’s excellent mechanical properties and environmental sustainability. Numerous fillers, admixtures and nano-dopants were studied in order to improve the overall performance of MOC-based derivatives. Some of them exhibited specific flaws, such as a tendency to aggregate, increase in porosity, aeration of the composite matrix, depreciation in water resistance and mechanical strength, etc. In this manuscript, MOC-based composites doped by multi-walled carbon nanotubes (MWCNTs) are designed and tested. In order to modify the final properties of composites, diatomite was admixed as partial substitution of MgO, which was used in the composition of the researched material in excess, i.e., the majority of MgO constituted part of MOC and the rest served as fine filler. The composites were subjected to the broad experimental campaign that covered SEM (scanning electron microscopy), EDS (energy dispersive spectroscopy), HR-TEM (high-resolution transmission electron microscopy), XRD (X-ray diffraction), OM (optical microscopy) and STA-MS (simultaneous thermal analysis with mass spectroscopy). For 28 days hardened samples, macrostructural and microstructural parameters, mechanical properties, hygric and thermal characteristics were experimentally assessed. The incorporation of MWCNTs and diatomite resulted in the significant enhancement of composites’ compactness, mechanical strength and stiffness and reduction in water absorption and rate of water imbibition. The thermal properties of the enriched MOC composites yielded interesting values and provided information for future modification of thermal performance of MOC composites with respect to their specific use in practice, e.g., in passive moderation of indoor climate. The combination of MWCNTs and diatomite represents a valuable modification of the MOC matrix and can be further exploited in the design and development of advanced building materials and components.

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Section: Resultsmentioning

confidence: 71%

MOC-Diatomite Composites Filled with Multi-Walled Carbon Nanotubes

et al. 2021

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“…The automatic balance allowed continuous recording of increasing sample mass. Based on measured results, the water absorption coefficient was evaluated as introduced by Fang et al [ 67 ]. The heat transport and storage properties, such as the thermal conductivity λ (W∙m −1 ∙K −1 ), the thermal diffusivity a (m 2 ∙s −1 ), and the volumetric heat capacity c v (J∙m −3 ∙K −1 ) were measured using a commercially manufactured apparatus ISOMET 2114 (Applied Precision Ltd., Bratislava, Slovakia).…”

Section: Methodsmentioning

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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“…The water absorption coefficient A w (kg·m −2 ·s −1/2 ) and apparent moisture diffusivity κ app (m 2 ·s −1 ) were evaluated based on the free water intake experiment. This test was conducted as introduced in the EN 1015-18 [ 62 ], and the data were assessed as proposed by Feng et al [ 63 ].…”

Section: Methodsmentioning

confidence: 99%

The Impact of Graphene and Diatomite Admixtures on the Performance and Properties of High-Performance Magnesium Oxychloride Cement Composites

et al. 2020

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A high-performance magnesium oxychloride cement (MOC) composite composed of silica sand, diatomite powder, and doped with graphene nanoplatelets was prepared and characterized. Diatomite was used as a 10 vol.% replacement for silica sand. The dosage of graphene was 0.5 wt.% of the sum of the MgO and MgCl2·6H2O masses. The broad product characterization included high-resolution transmission electron microscopy, X-ray diffraction, X-ray fluorescence, scanning electron microscopy and energy dispersive spectroscopy analyses. The macrostructural parameters, pore size distribution, mechanical resistance, stiffness, hygric and thermal parameters of the composites matured for 28-days were also the subject of investigation. The combination of diatomite and graphene nanoplatelets greatly reduced the porosity and average pore size in comparison with the reference material composed of MOC and silica sand. In the developed composites, well stable and mechanically resistant phase 5 was the only precipitated compound. Therefore, the developed composite shows high compactness, strength, and low water imbibition which ensure high application potential of this novel type of material in the construction industry.

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Hygric properties of porous building materials (VI): A round robin campaign

Cited by 52 publications

References 32 publications

MOC-Diatomite Composites Filled with Multi-Walled Carbon Nanotubes

MOC-Diatomite Composites Filled with Multi-Walled Carbon Nanotubes

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

The Impact of Graphene and Diatomite Admixtures on the Performance and Properties of High-Performance Magnesium Oxychloride Cement Composites

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