Hygrothermal Performance of Lime-Hemp Wall Assemblies

Evrard, Arnaud; Herde, André De

doi:10.1177/1744259109355730

Cited by 97 publications

(77 citation statements)

References 2 publications

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“…The hygic and thermal properties of bio-aggregate based building materials give them a particular hygrothermal behaviour which allows reducing the energy demand of buildings while maintaining indoor relative humidity [24] [25]. The investigations of the hygrothermal behaviour of building materials at large scale, found in literature, are generally performed numerically.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Experimental highlight of hygrothermal phenomena in hemp concrete wall

Collet

Prétot

2014

Building and Environment

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To cite this version:Florence Collet, Sylvie Pretot. Experimental highlight of hygrothermal phenomena in hemp concrete wall. Building and Environment, Elsevier, 2014, 82, pp.459-466. 10.1016/j.buildenv.2014 M A N U S C R I P T A C C E P T E D AbstractThis study investigates the hygrothermal behaviour of a timber-framed hemp concrete wall made of precast blocks. Measurements are performed on an uncoated wall as well as on a coated wall. The experimental device consists in two air-conditioned rooms where ambient conditions are selected to induce temperature and/or vapour pressure gradient between the two sides of the wall. The monitoring deals with temperature and relative humidity within the wall. Kinetics of temperature and of vapour pressure are given. Profiles are drawn at several times of the transient phase. In the regular part of the wall, several kinds of hygric behaviours are highlighted such as homogeneous vapour diffusion and huge vapour pressure variations due to evaporation-condensation and/or sorption-desorption phenomena. The results in the line of frame show that the frame doesn't induce disturbances in the hygrothermal behaviour of the wall. It is also shown that the coating reduces and delays vapour diffusion.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Experimental highlight of hygrothermal phenomena in hemp concrete wall

Collet

Prétot

2014

Building and Environment

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“…The tested material is a LHC wall-mix (Evrard and De Herde, 2010) from the same origin as samples used by Evrard (2008). The binder is the widespread Tradical PF70 mixed with…”

Section: Test Platformmentioning

confidence: 99%

“…With appropriate mixing proportions, they can be used in various applications like walls, roof insulation or even plasters (Evrard and De Herde, 2010). Many authors worked on LHC characterization and provided a set of physical and hygrothermal parameters for different mixes (Collet et al, 2008;Samri, 2008;Evrard and De Herde, 2010). The pore size distributions of the mixes or individual components were assessed by some of them with mercury porosimetry technique.…”

Section: Lime-hemp Concrete Materialsmentioning

confidence: 99%

“…Indeed, the multimodal moisture storage function was fitted on experimental points that were previously obtained by Evrard and De Herde (2010) with pressure plate and salt solutions methods. Literature data from mercury intrusion porosimetry on LHC helped to select the main pore radii 2 and 3 in accordance with the real pore size distribution.…”

Section: Moisture Retention Curve Calibrationmentioning

confidence: 99%

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Modeling the hygrothermal behavior of biobased construction materials

Dubois

Evrard

Lebeau

2013

Journal of Building Physics

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The construction materials with high moisture exchange capacity may have a strong impact on indoor climate conditions as well as on energy performance of buildings. Crop-based materials, characterized by their high porosity and hygroscopic properties, belong to this category. Modeling their hygrothermal behavior with accuracy is thus particularly relevant for an efficient building design. A transient Building Element Heat Air and Moisture (BEHAM) model is developed in COMSOL Multiphysics to simulate the moisture exchange between a Lime-Hemp Concrete bloc and surrounding air during a Moisture Buffer Value (MBV) evaluation test.The simulation results are compared to well-validated BEHAM software with the help of performance criteria. The proposed model shows a slightly better efficiency in the characterization of both moisture exchange and latent heat effect phenomena. In addition, it offers advantages in terms of flexibility and transparency as well as further evolution potential.

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“…The large proportion of bio-sourced material means that hemp-lime is a net absorber of carbon dioxide that is essentially sustainable to produce [1][2][3]. The multi scaled porous structure within hemp-lime produces a high thermal resistivity alongside a high thermal storage capacity and moisture buffering properties, making it a desirable infill insulation material for use in building envelopes [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The influence of the casting process on the internal structure and physical properties of hemp-lime

2016

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Bio-aggregate composites such as hemplime offer a more sustainable alternative to traditional walling infill material. Hemp-lime, whether in situ or prefabricated, is generally either cast or sprayed, which results in a directionally dependent, typically layered, physical structure. This paper considers the impact of compaction and layering on the directional thermal conductivity, compressive strength and internal structure of the material through use of a novel image analysis method. The results presented indicate that production variables have a significant, and crucially, directionally dependent impact on the thermal and mechanical properties of cast hemp-lime.

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Hygrothermal Performance of Lime-Hemp Wall Assemblies

Cited by 97 publications

References 2 publications

Experimental highlight of hygrothermal phenomena in hemp concrete wall

Experimental highlight of hygrothermal phenomena in hemp concrete wall

Modeling the hygrothermal behavior of biobased construction materials

The influence of the casting process on the internal structure and physical properties of hemp-lime

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