Hygrothermal performance of various Typha–clay composite

Niang, Ibrahim; Maalouf, Chadi; Moussa, Tala; Bliard, Christophe; Samin, Etienne; Thomachot-Schneider, Céline; Lachi, Mohammed; Pron, Hervé; Hoang, Ton; Gaye, Salif

doi:10.1177/1744259118759677

Cited by 38 publications

(39 citation statements)

References 20 publications

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“…In order to test physical, mechanical and thermal characteristics sometimes the samples can be oven-dried at a temperature of 105 • , as for [14][15][16] or at 50 • C [17]. Moevus et al [14] point out that the determination of water content in earth is of paramount importance, as it affects the mechanical (decreasing the resistance [12]) and thermal properties of earth-based materials, so that many researches [16][17][18][19][20][21][22] pointed out the importance of determining the equilibrium soil moisture at ambient humidity and to compare it to relative humidity, environmental temperature, effects of soil grading, surface impermeability and activity of the clay (which is the affinity of clay to water, higher for swelling clays as montmorillonite).…”

Section: Hygrothermal Properties Of Earth−based Materials and Methodomentioning

confidence: 99%

Hygrothermal Properties of Raw Earth Materials: A Literature Review

2019

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Raw earth historic and contemporary architectures are renowned for their good environmental properties of recyclability and low embodied energy along the production process. Earth massive walls are universally known to be able to regulate indoor thermal and hygroscopic conditions containing energy consumptions, creating comfortable interior spaces with a low carbon footprint. Therefore, earth buildings are de facto green buildings. As a result of this, some earthen technologies have been rediscovered and implemented to be adapted to the contemporary building production sector. Nevertheless, the diffusion of contemporary earthen architecture is decelerated by the lack of broadly accepted standards on its anti-seismic and thermal performance. Indeed, the former issue has been solved using high-tensile materials inside the walls or surface reinforcements on their sides to improve their flexural strength. The latter issue is related to the penalization of earth walls thermal behavior in current regulations, which tent to evaluate only the steady-state performance of building components, neglecting the benefit of heat storage and hygrothermal buffering effect provided by massive and porous envelopes as raw earth ones. In this paper, we show the results of a paper review concerning the hygrothermal performance of earthen materials for contemporary housing: great attention is given to the base materials which are used (inorganic soils, natural fibers, and mineral or recycled aggregates, chemical stabilizers), manufacturing procedures (when described), performed tests and final performances. Different earth techniques (adobe, cob, extruded bricks, rammed earth, compressed earth blocks, light earth) have been considered in order to highlight that earth material can act both as a conductive and insulating meterial depending on how it is implemented, adapting to several climate contests. The paper aims to summarize current progress in the improvement of thermal performance of raw earth traditional mixes, discuss the suitability of existing measurement protocols for hygroscopic and natural materials and provide guidance for further researches.

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Section: Hygrothermal Properties Of Earth−based Materials and Methodomentioning

confidence: 99%

Hygrothermal Properties of Raw Earth Materials: A Literature Review

2019

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“…K-1 and 0.100 W. m-1. K-1) [2,7]. But it is greater than others composite such as hemp-clay and cork concrete [8,11].…”

Section: Thermal Conductivitymentioning

confidence: 96%

“…But it is greater than others composite such as hemp-clay and cork concrete [8,11]. Thus, leads to a better thermal inertia compared to hemp-starch composite [2,7,8].…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…Therefore, the use of a renewable energy and an ecofriendly and sustainable materials in building application is needed to reduce both environmental impacts and primary energy use. The use of bio-based composites appears as a good solution while maintaining high indoor comfort [1][2][3][4]. In this context, developing innovative building material from locally available renewable resources seem a good solution to enhance the energy characteristics of buildings and induce the energy consuming behavior [4].…”

Section: Introductionmentioning

confidence: 99%

“…The results show a low thermal conductivity (0.11 W/m. K) [2].Sugar beet (see Figure 1a) (Beta vulgaris var. saccharifera) is widely grown in France (32 millions of tons / year).…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and thermal characterization of a beet pulp-starch composite for building applications

et al. 2019

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This work shows the making of a new bio-based material for building insulation from sugar beet pulp and potato starch. The material is both lightweight and ecofriendly. The influence of starch/ sugar beet pulp ratio (S/BP) is studied. Four binder mass dosages are considered, 10, 20, 30 and 40% (relative to the beet pulp). Samples are characterized in terms of absolute and bulk density, compressive and flexural strength, as well as thermal properties (thermal conductivity and thermal inertia). The compressive strength increases linearly with the S/BP mass ratio to reach 0.52 MPa and the compressive strain is 30%. The thermal conductivity is to around 0.070 W/m. K. The results obtained shows that increasing starch amount tends to decrease composite porosity but increases thermal conductivity and mechanical properties. Depending on the starch content, beet pulp composites have a good thermal and can be used as building materials.

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