Moisture content influence on the thermal conductivity and diffusivity of wood–concrete composite

Taoukil, Driss; Bouardi, Abdelmajid El; Sick, Friedrich; Mimet, Abdelaziz; Ezbakhe, Hassan; Ajzoul, T.

doi:10.1016/j.conbuildmat.2013.06.067

Cited by 133 publications

(52 citation statements)

References 15 publications

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“…This was observed in several studies on various materials such as brick, M A N U S C R I P T A C C E P T E D maximal value when the moisture content is 1.78%. This variation is similar to the one given by Taoukil for wood concrete [39]. For CHLP, the maximal value of diffusivity would probably appear for higher value of water content.…”

Section: Thermal Propertiessupporting

confidence: 70%

Hygric and thermal properties of hemp-lime plasters

Mazhoud

Collet

Prétot

et al. 2016

Building and Environment

120

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To cite this version:Brahim Mazhoud, Florence Collet, Sylvie Pretot, Julien Chamoin. Hygric and thermal properties of hemp-lime plasters.Building and Environment, Elsevier, 2016Elsevier, , 96, pp.206-216. 10.1016Elsevier, /j.buildenv.2015 M A N U S C R I P T A C C E P T E D AbstractHemp-lime mortars are generally used as indoor insulating plasters of building envelopes. They can be applied in thick coat to allow high enough hygrothermal performances to be reached in retrofit case. This study investigates hygric and thermal properties of two hemp-lime plasters. These plasters are made with the same lime-based binder and differ from their kind of hemp shiv. The two kinds of hemp shiv are defibered but one is smaller than the other. This experimental study is based on the measurement of sorption isotherm, water vapour permeability, moisture buffer value and thermal properties (conductivity and diffusivity). The effect of temperature on moisture buffer value and on thermal properties is also investigated. It is shown that hemp-lime plasters are hygroscopic and breathable materials. They are good hygric regulators according to the Nordtest classification and their moisture buffering ability is slightly impacted by temperature in the range from 11° to 23°C. The hemp-lime plaster with the smallest hemp M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT2 shiv is a better hygric regulator than the one with the biggest hemp shiv. Hemp-lime plasters show a quite low thermal conductivity, around 0.2 W/(m.K). The hemp-lime plaster with the smallest hemp shiv is slightly more conductive than the one with the biggest hemp shiv. The temperature does not impact thermal conductivity at dry state. At wet state, for a given relative humidity, when the temperature increases the thermal conductivity decreases simultaneously with water content. This study underlines that hemp-lime plasters show high hygrothermal qualities.

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Section: Thermal Propertiessupporting

confidence: 70%

Hygric and thermal properties of hemp-lime plasters

Mazhoud

Collet

Prétot

et al. 2016

Building and Environment

120

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“…The precision of measures on thermal conductivity is Dk = k ¼ 6%. This result was observed on other materials such as sawdust concrete [12,13,14].…”

Section: Resultssupporting

confidence: 65%

Thermo-mechanical characterization of construction material lightened by olive pomace

Belkharchouche

Chaker

2017

Mater Renew Sustain Energy

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The development of porous materials requires a thorough knowledge of their physical properties. When used as thermal insulation, the properties that govern their insulating capacity are thermal conductivity, thermal diffusivity and specific heat. The presence of moisture, some of its origin, in buildings causes damage to walls that extend from the formation of mold in complete impregnation through the degradation of the thermal and mechanical performance. The major objective of this study is to determine the physical properties of a building material lightened by vegetable fiber (concrete pomace olive), used as an insulation bearer. Our goal is to develop and expand the field of use of these materials in construction. A judicious choice of additions proportions and implementation techniques will be considered. A particular interest is the thermal characteristics and mechanical strength, which is a decisive criterion for selecting a material in the construction. We determine the thermal conductivity of the materials studied with experimental equipment that allows us to make measurements of the thermal properties under actual use conditions (temperature and humidity) and also the study of the mechanical compressive strength of the materials studied and the interest in these materials is highlighted.

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“…The presence of water leads to increased effective thermal conductivity of moist porous building materials to a great extent from their dry state, in view of the fact that the thermal conductivity of liquid water is orders of magnitude higher than that of air. Hence, the hygric dependence on the effective thermal conductivity of common porous building materials, such as concrete with various functionalities/compositions [3][4][5][6][7][8], hemp-based composites [9], wood [10] and wood-based composites [11][12][13], lime-and calcium silicate hydrate (C-S-H)-based composites [14,15], and thermal insulation materials [16][17][18][19], is of great significance for accurate prediction of their thermal responses.…”

Section: Introductionmentioning

confidence: 99%