Water vapour permeability of innovative building materials from different waste

Buratti, Cinzia; Belloni, Elisa; Merli, Francesca

doi:10.1016/j.matlet.2020.127459

Cited by 24 publications

(8 citation statements)

References 7 publications

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“…Furthermore, it is possible to observe that the water vapour resistance properties obtained for the WW-based fillers are in the range of 2.2–3.3, which are in a good agreement with the values of vegetable fibres, such as wood (3–10), hemp, flax and corn (1–3), as presented in Reference [ 40 ].…”

Section: Resultssupporting

confidence: 83%

“…Additionally, the WB filler has the lowest possible porosity (~60 vol.% [37]) compared to WS (~78 vol.% [38]) and HS (~77 vol.% [39]) fillers, which might be another key factor influencing the increased water vapour resistance. Furthermore, it is possible to observe that the water vapour resistance properties obtained for the WW-based fillers are in the range of 2.2-3.3, which are in a good agreement with the values of vegetable fibres, such as wood (3-10), hemp, flax and corn (1-3), as presented in Reference [40].…”

Section: Selection and Characterisation Of The Ww-based Fillersupporting

confidence: 80%

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Research of Wood Waste as a Potential Filler for Loose-Fill Building Insulation: Appropriate Selection and Incorporation into Polyurethane Biocomposite Foams

et al. 2020

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Currently, the recycling potential of wood waste (WW) is still limited, and in a resource efficiency approach, recycling WW in insulation materials, such as polyurethane (PUR), appears as an appropriate solution. It is known that the quality of WW is the main aspect which influences the stability of the final products. Therefore, the current study analyses different WW-based fillers as possible modifiers for polyurethane biocomposite foams for the application as loose-fill materials in building envelopes. During the study of WW-based fillers, it was determined that the most promising filler is wood scobs (WS) with a thermal conductivity of 0.0496 W/m·K, short-term water absorption by partial immersion—12.5 kg/m2, water vapour resistance—0.34 m2·h·Pa/mg and water vapour diffusion resistance factor—2.4. In order to evaluate the WS performance as a filler in PUR biocomposite foams, different ratios of PUR binder and WS filler (PURb/WS) were selected. It was found that a 0.40 PURb/WS ratio is insufficient for the appropriate wetting of WS filler while a 0.70 PURb/WS ratio produced PUR biocomposite foams with the most suitable performance: thermal conductivity reduced from 0.0523 to 0.0476 W/m·K, water absorption—from 5.6 to 1.3 kg/m2, while the compressive strength increased from 142 to 272 kPa and the tensile strength increased from 44 to 272 kPa.

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Section: Resultssupporting

confidence: 83%

Section: Selection and Characterisation Of The Ww-based Fillersupporting

confidence: 80%

Research of Wood Waste as a Potential Filler for Loose-Fill Building Insulation: Appropriate Selection and Incorporation into Polyurethane Biocomposite Foams

et al. 2020

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“…The possibility of introducing uncertainties in measurements was higher for smaller specimens, thus the number of specimens was increased from three to five, and a comparison with previous studies was run to confirm the accuracy of the results. Hence, Table 5 reports values of WVP and resistance factor determined by dry cup from the literature [40][41][42][43][44][45][46][47][48][49][50]. For clayand air-lime-based plasters, the consistent difference between the dry and wet methods has previously been shown by some authors [43,[45][46][47], with values of resistance factor determined by dry cup two times higher than by wet cup, but no evidence of this difference was found for cement mortars.…”

Section: Water Vapour Permeabilitymentioning

confidence: 90%

Traditional and Modern Plasters for Built Heritage: Suitability and Contribution for Passive Relative Humidity Regulation

2021

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Plasters have covered wide surface areas of buildings since antiquity, with a main purpose of indoor protection of the substrate on which they are applied. When no longer functional, they might require substitution with solutions that can combine compatibility with the substrate with the current need to mitigate building emissions. Indeed, plasters can contribute to lowering buildings’ energy demands while improving indoor air quality and the comfort of buildings’ users, as plasters can be used as passive regulators of relative humidity (RH). Hence, this study presents the relative-humidity-dependent properties of different plastering mortars based on clay, air lime, and natural hydraulic lime, and plastering finishing pastes based on gypsum and gypsum–air lime, in all cases tested using small size specimens. A cement-based plaster is also analysed for comparison. The clay-based plaster was the most promising material for RH passive regulation, and could be applied to repair and replace plasters in different types of buildings. Pastes based on air lime–gypsum could be applied as finishing layers, specifically on traditional porous walls. The sorption behaviour of cement plaster appeared interesting; however, its water vapour permeability was as expected, found to be the lowest, discouraging its application on historic walls.

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“…The dry cup method contains a desiccant saturated solution inside the cup, ensuring a humidity of 0–3% [ 32 , 33 , 34 ]. Calcium chloride [ 8 , 9 ] or silica gel [ 35 ] can be used as a desiccant. The wet cup method, on the other hand, contains a saturated aqueous solution, which provides a moisture content with a range of 52–98% [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Cement Addition on Water Vapour Resistance Factor of Rammed Earth

2021

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The article aims to determine the effect of cement addition on the water vapour resistance factor of stabilized rammed earth. Literature analysis indicates that different earthen materials show large differences in water vapour resistance factor values. The high diffusion resistance of concrete concerning other construction materials suggests that cement will be one of the factors significantly affecting these values. The paper presents water vapour resistance factor test results of rammed earth with various soil particle sizes and cement contents. The obtained results showed that an increase of cement addition increases the diffusion resistance of the material. However, the diffusion resistance of cement stabilized rammed earth is still low compared to concrete.

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Water vapour permeability of innovative building materials from different waste

Cited by 24 publications

References 7 publications

Research of Wood Waste as a Potential Filler for Loose-Fill Building Insulation: Appropriate Selection and Incorporation into Polyurethane Biocomposite Foams

Research of Wood Waste as a Potential Filler for Loose-Fill Building Insulation: Appropriate Selection and Incorporation into Polyurethane Biocomposite Foams

Traditional and Modern Plasters for Built Heritage: Suitability and Contribution for Passive Relative Humidity Regulation

The Effect of Cement Addition on Water Vapour Resistance Factor of Rammed Earth

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