Hygrothermal properties of bio-insulation building materials based on bamboo fibers and bio-glues

Nguyen, Dang Mao; Grillet, Anne‐Cécile; Diep, Thi My Hanh; Thuc, Chi Nhan Ha; Woloszyn, Monika

doi:10.1016/j.conbuildmat.2017.08.075

Cited by 77 publications

(39 citation statements)

References 63 publications

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“…Palumbo et al [15] reported the MBV results for six different bio-based materials: hemp lime, hemp fibre, wood wool, wood fibre, barley-straw starch and corn pith-alginate. Novel bio-insulating particleboards made from bamboo powders and various bio-adhesives were investigated by Nguyen [16], and Limam et al [3] studied bio-based insulating materials based on various hemp and shive-fibre ratios.…”

Section: Introductionmentioning

confidence: 99%

Moisture Buffering of Multilayer Internal Wall Assemblies at the Micro Scale: Experimental Study and Numerical Modelling

Kaczorek

2019

Applied Sciences

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In this paper, a series of experiments assessing the moisture buffer value (MBV) of four internal wall assembly samples made from hygroscopic materials was performed. A modified Nordtest protocol was used. Moisture buffer values of all the investigated wall assemblies, with varying moisture loads in the range of 50% to 80%, showed a moderate moisture buffer value (MBV: 0.5–1.0 (g·m−2·%RH−1)). The results showed that in a wall assembly where the MBV of the whole assembly is lower than the MBV of the outer layers, the moisture-buffering capacity of the inner layer is untapped. Outer layers affect inner layers by changing their moisture-buffering capacity, which in turn changes the overall performance of the whole assembly. In addition, it was observed that if the penetration depth value of the outer layer is greater than its thickness, vapour reaches into the deeper layer and wall assemblies made of layers with materials characterized by a lower value of penetration depth reach steady state more slowly. The WUFI Pro tool was used to compare the simulated and experimental results. Despite the discrepancies between these results, it offers a simplified method, helping designers make decisions about which materials to choose to improve the moisture-buffering effect.

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Section: Introductionmentioning

confidence: 99%

Moisture Buffering of Multilayer Internal Wall Assemblies at the Micro Scale: Experimental Study and Numerical Modelling

Kaczorek

2019

Applied Sciences

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“…The moisture buffering potential expressed by the moisture buffer value (MBV) commonly determined by the Nordtest protocol [46] varied significantly. On the one hand, the beneficial results achieved by several natural-based materials struggle with higher variability and poses a drawback preventing their wider utilization [23]. The utilization of carnauba wax was found as capable to improve the MBV from 0.3 to 1.1 g/∆RH/m 2 , however, on the other hand, the expected improvement may not occur due to the affinity of natural fibers for moisture [24].…”

Section: Resultsmentioning

confidence: 94%

“…For this purpose, studies aimed at the utilization of mortars modified by various additives were carried out as a moisture buffering agent [20][21][22]. Specifically, materials such as bamboo fibers, cellulose, hemp fibers, plywood, lightweight aggregates, porogene additives, and many others were investigated with particular success [21,[23][24][25][26][27]. Nonetheless, the obtained benefit was only partial since the moisture buffer value (MBV) was classified as moderate.…”

Section: Introductionmentioning

confidence: 99%

Influence of Superabsorbent Polymers on Moisture Control in Building Interiors

et al. 2020

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Moisture loads in building interiors are accompanied by a deterioration of the indoor air quality. Such a phenomenon may induce serious health risks for building inhabitants as well as degradation of furnishing. Unfortunately, the employment of additional heat, ventilation and air conditioning (HVAC) devices does not comply with the sustainability principle due to increased energy consumption, thus cannot be viewed as an efficient solution. This study deals with the use of superabsorbent polymers (SAP) in cement-lime plasters, thus extends the current state of knowledge and outlines further possible development of novel moisture responsive plasters since lightweight aggregates do not provide the desired performance. To be specific, this paper contemplates the experimental analysis of novel plasters modified by 0.5, 1 and 1.5 wt. % of SAP to obtain input parameters for computational modeling. Based on the obtained outputs, the incorporation of SAP admixture resulted in a substantial increase in moisture transport properties including the water absorption coefficient and water vapor diffusion properties. The performed computational modeling revealed a considerable reduction of relative humidity fluctuations, thus mitigation of potential health issues associated with undesired moisture content in building interiors. Achieved results indicate that the SAP enhanced plasters have substantial passive moisture buffering performance and thus may contribute to the improvement of indoor air quality.

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“…When the ambient humidity increase or decrease, the hygroscopic fiber materials absorb or desorb water vapor until moisture absorbing saturation (MAS) state reach. The process is also regarded as a saturation state and can be characterized by water vapor sorption kinetics obtained by plotting mass gain or loss percentage as function of time [37]. An equivalent porosity f eq for hygroscopic fabrics with saturation regain is proposed in the work to reasonably eliminating the absorbed moisture effects.…”

Section: Equivalent Porosity F Eq For Absorbent Fabricmentioning

confidence: 99%

Investigating the effective thermal conductivity of moist fibrous fabric based on Parallel-Series model: a consideration of material’s swelling effect

Zhu

2020

Mater. Res. Express

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The aim of this work reported in the paper is to investigate the influence of moisture content on the effective thermal conductivity (ETC) of non-hygroscopic Polyethylene terephthalate (PET) and hygroscopic Viscose (VC) fabrics using Parallel-Series (P-S) thermal-electrical analogy method and TPS measurement. An equivalent porosity for hygroscopic fabric was first proposed to preserve the validity of the P-S model. The equivalent porosity is characterized by reasonably eliminating the absorbed moisture effects partly, which is embodied in enhancing heat conduction, endothermic reaction and swelling. Calculated values of the effective thermal conductivity of the two kinds of fabrics had been compared with experimental measurements. Results show that the P-S model incorporated with equivalent porosity is found to yield higher prediction accuracy than that of P-S model with parent porosity. The calibrated model can also provide a robust tool for predicting the global effective thermal conductivity of moist hygroscopic fibrous porous media. Nomenclature P-SParallel-Series ETC Effective thermal conductivity ΔP pressure difference r pore-throat radius || parallel ⊥ series T temperature

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Hygrothermal properties of bio-insulation building materials based on bamboo fibers and bio-glues

Cited by 77 publications

References 63 publications

Moisture Buffering of Multilayer Internal Wall Assemblies at the Micro Scale: Experimental Study and Numerical Modelling

Moisture Buffering of Multilayer Internal Wall Assemblies at the Micro Scale: Experimental Study and Numerical Modelling

Influence of Superabsorbent Polymers on Moisture Control in Building Interiors

Investigating the effective thermal conductivity of moist fibrous fabric based on Parallel-Series model: a consideration of material’s swelling effect

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