Hygrothermal behaviour of hemp-lime walls: the effect of binder carbonation over time

Moletti, Chiara; Aversa, P.; Losini, Alessia Emanuela; Dotelli, Giovanni; Woloszyn, Monika; Luprano, V.A.M.

doi:10.1016/j.buildenv.2023.110129

Cited by 9 publications

(2 citation statements)

References 47 publications

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“…There is a substantial number of research articles that have been published on the hygrothermal, fire, and mechanical performance of hemp-lime insulation [11][12][13][14][15][16][17] indicating that hemp-lime, comprising of hemp-shive and lime binder, demonstrates moderate thermal conductivity ranging from 0.06 to 0.12 W/m.K, with specific heat capacity ranging between 1300 and 1700 J/kg.K and a density usually ranging between 220 and 950 kg/m 3 . Furthermore, hemp-lime possesses excellent moisture buffering capacity and can be moulded into various rigid forms and utilised as flooring, walling, or roofing materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Moisture-Dependent Thermal Conductivity, and Hygric Properties of Novel Hemp–shive Insulations with Numerical Assessment of Their In-Built Hygrothermal and Energy Performance

Latif

2024

Materials

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The use of lime as a binder in hemp–lime considerably increases the drying time of hemp–lime after casting. Furthermore, lime is a non-renewable mineral resource. As such, this paper explores the effectiveness of using an alternative non-mineral binder instead of lime to formulate a novel hemp–shive insulation. The moisture-dependent thermal conductivity, adsorption isotherm, vapour diffusion resistance factor, and in-built hygrothermal performance of four variants of a novel bio-based insulation were investigated. The hygrothermal performance of the novel hemp–shive insulation was compared with that of a previously developed novel hemp–lime insulation. No significant variation in thermal conductivity of hemp–shive insulations between the equilibrium moisture contents (EMC) at 0% and 50% relative humidity (RH) was observed, but there was a substantial increase in thermal conductivity hemp–shive insulations when the material reached the EMC at 98% RH. The average dry thermal conductivity values of hemp–shive and hemp–lime insulations were also similar. The adsorption isotherms of hemp–shive insulations were determined at 0%, 20%, 50%, 70%, 90%, and 98% relative humidity steps. At 98% RH, the moisture adsorption capacity of hemp–shive insulations was 4-to-5-times higher than that of hemp–lime insulation. Hemp–shive insulations’ vapour diffusion resistance factor (µ value) was about double the µ value of hemp–lime insulation. Hemp–shive insulations exhibited 4-to-5-times higher water absorption resistance than that of hemp–lime insulation. Numerically determined porosity values of hemp–shive agree with the values of wood-based insulation materials of similar density. Finally, using all experimentally acquired data as inputs, dynamic whole-building hygrothermal simulations were carried out and the results show that novel hemp–shive insulation materials perform at a similar level to the hemp–lime insulation in terms of heating and cooling energy demand but require 45% less energy for humidification. However, the relative humidity inside the hemp–shive wall remains higher than 70%, which can potentially induce mould growth.

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Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Moisture-Dependent Thermal Conductivity, and Hygric Properties of Novel Hemp–shive Insulations with Numerical Assessment of Their In-Built Hygrothermal and Energy Performance

Latif

2024

Materials

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“…The study also emphasizes the influence of hemp shiv degradability on emissions, highlighting the material's environmental sensitivity. Moletti et al 28 study examines the hygrothermal properties of hemp–lime, a sustainable building material made from lime-based binders and hemp shives. By conducting experiments over three years and using numerical simulations, the research demonstrates that the material's performance improves with maturation, primarily attributed to binder carbonation and reduced initial moisture content, as confirmed by XRD and TG-DTG analyses.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the physical, microstructural, and mechanical properties of hemp limecrete

Avudaiappan,

Cuello Moreno,

Montoya R

et al. 2023

Sci Rep

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This paper investigates the hemp limecrete mechanical and microstructural performance of a new sustainable and environmental friendly building material. Several studies have investigated the hemp limecrete focusing on the non-structural applications. The newly developed hemp limecrete consists of high mechanical and microstructural properties. The specimens were prepared with varying lengths and proportions of hemp fibers with lime and tested for compressive strength, flexural strength, thermal conductivity and microstructural analysis like SEM and EDS. The study found that the optimal fiber content for making mortars was between 2 and 4%. This conclusion was reached after analyzing the influence of fiber length and ratio on the properties of the mortars. The dry unit weight decreased when the fiber content was higher than 4%. In terms of strength, the study found that the flexural strength of the hemp limecrete improved with an increase in fiber ratio, but the compressive strength decreased. However, with 2% hemp fiber, compressive strengths of 3.48 MPa and above were obtained. The study also highlighted the good thermal insulation properties and dimensional stability of hemp limecrete. These findings have important implications for the use of hemp limecrete as a sustainable building material. The results suggest that hemp limecrete has the potential to be a viable alternative to conventional concrete in specific applications, particularly in areas where environmental sustainability is a priority.

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Energy efficiency and hygrothermal performance of hemp clay walls for Moroccan residential buildings: An integrated lab-scale, in-situ and simulation-based assessment

Es-sakali,

Charai,

Idrissi Kaitouni

et al. 2023

Applied Energy

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Hygrothermal behaviour of hemp-lime walls: the effect of binder carbonation over time

Cited by 9 publications

References 47 publications

Experimental Analysis of Moisture-Dependent Thermal Conductivity, and Hygric Properties of Novel Hemp–shive Insulations with Numerical Assessment of Their In-Built Hygrothermal and Energy Performance

Experimental Analysis of Moisture-Dependent Thermal Conductivity, and Hygric Properties of Novel Hemp–shive Insulations with Numerical Assessment of Their In-Built Hygrothermal and Energy Performance

Experimental investigation on the physical, microstructural, and mechanical properties of hemp limecrete

Energy efficiency and hygrothermal performance of hemp clay walls for Moroccan residential buildings: An integrated lab-scale, in-situ and simulation-based assessment

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