Thermo-physical analysis of low-cost ecological composites for building construction

Tiskatine, Rachid; Bougdour, N.; Oaddi, R.; Gourdo, L.; Rahib, Yassine; Bouzit, Said; Bazgaou, A.; Bouirden, L.; Ihlal, A.; Aharoune, A.

doi:10.1016/j.jobe.2018.09.015

Cited by 34 publications

(17 citation statements)

References 59 publications

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“…The thermal conductivity of CEBs stabilized with by-product binders evolved with water content similarly to few studies described in the literature; they showed that the rate of increase is around 0.06 W/(m∙K∙%) [ 2 , 34 , 35 ]. Bogas et al [ 27 ] also claimed that the thermal conductivity of water saturated CEBs (water content of 13–16%) was 2–2.4 times higher than that of dry CEBs.…”

Section: Resultssupporting

confidence: 59%

“…Despite its benefits on mechanical and durability properties, the stabilization of raw earthen material using cement is criticized for tempering with its natural advantages; i.e., low energy and carbon footprint, recyclability, moisture exchange capacity, and hygrothermal performances, among others [ 1 , 2 , 3 ]. Alternatively, the stabilization of raw earth can be achieved by mechanical compaction using relatively low to high pressure (2–10 MPa) [ 4 ], or hypercompaction up to 100 MPa [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

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Physico-Mechanical and Hygro-Thermal Properties of Compressed Earth Blocks Stabilized with Industrial and Agro By-Product Binders

Nshimiyimana

Courard

2020

Materials

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This study investigated the engineering properties of compressed earth blocks (CEBs) stabilized with by-product binders: calcium carbide residue (CCR) and rice husk ash (RHA). The dry mixtures were prepared using the earthen material and 0–25 wt% CCR, firstly, and 20 wt% CCR partially substituted by the RHA (CCR:RHA in 20:0–12:8 ratios), secondly. The appropriate amount of water was thoroughly mixed with the dry mixtures. The moistened mixtures were manually compressed into CEBs, cured, dried, and tested. The stabilization of CEBs with CCR increased the dry compressive strength (CS) from 1.1 MPa with 0% CCR to 4.3 MPa with 10% CCR and above; decreased the bulk density (ρb:1800–1475 kg/m3) and increased the total porosity (TP:35–45%). This resulted in the improvement of the coefficient of structural efficiency (CSE: 610–3050 Pa∙m3/kg). It also improved the thermal efficiency given the decrease of the thermal conductivity (λ: 1.02–0.69 W/m∙K), thermal diffusivity (a: 6.3 × 10−7 to 4.7 × 10−7 m²/s) and thermal penetration depth (δp: 0.13–0.11 m). The RHA further improved the CS up to 7 MPa, reaching the optimum with 16:4 CCR:RHA (ρb: 1575 kg/m3 and TP: 40%). The latter reached higher CSE (4460 Pa∙m3/kg) than cement stabilized CEBs (3540 Pa∙m3/kg). It reached lower λ (0.64 w/m∙K), a (4.1 × 10−7 m²/s) and δp (0.11 m) than cement CEBs (1.01 w/m∙K, 6.8 × 10−7 m²/s, and 0.14 m). Additionally, the stabilization of CEBs with by-products improved the moisture sorption capacity. The improvement of the structural and thermal efficiency of CEBs by the stabilization with by-product binders is beneficial for load-bearing capacity and thermal performances in multi-storey buildings.

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Section: Resultssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Physico-Mechanical and Hygro-Thermal Properties of Compressed Earth Blocks Stabilized with Industrial and Agro By-Product Binders

Nshimiyimana

Courard

2020

Materials

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“…The increase in its electrical resistance corresponds to the temperature increase of the sample surface facing the sensor (Δt ave). The Hot Disk is electrically heated causing the increase in temperature which is directly related to the variation in the sensor resistance R(t) by the equation [5]:…”

Section: Thermal Conductivity Measurementmentioning

confidence: 99%

“…However, agricultural biomass additives such as straw improve the properties of mud bricks [1].Consequently, studying these properties is a first step in evaluating the impact of the material not only on energy consumption, but also on indoor comfort [3]. The use of organic additives has increased worldwide, mainly due to their availability and also for their thermal, mechanical and environmental impact [4][5][6][7][8][9][10].As a result, the incorporation of biomass additives into clay bricks can reduce thermal conductivity and enhance compressive strengths. In our case, we used the argan shells as additives to the clay blocks; Argan trees are located mainly in the sous massa region.…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of clay based material incorporating Argan Shell: Experimental characterization

et al. 2021

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This research investigated the impact of agricultural biomass additives (Argan shell) on the thermal and physical properties of fired clay bricks for building application. The objective of the study is to characterize the selected materials from molecule up to the final materials used in buildings. The materials used in this study, are soil and Argan shells, locally available materials for brick making. The Argan shells were grinded and then added to the clay mixture. The Clay brick shows a formation of pores during the firing process up to 1050°C. As results, the bulk density of the clay bricks decreased due to the pores formation. On the other hand, the thermal conductivity of the clay bricks was reduced by 53% using 20wt% of the biomass additives.

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“…Tiskatine et al [7] presented an experimental study on the thermal performance of new low cost composites based on natural materials for use in building construction in order to enhance the thermal comfort in buildings. The materials used in this study are widely available in the region of Souss Massa such as: sand, red clay, date palm waste, sawdust, straw and argan shell.…”

Section: Introductionmentioning

confidence: 99%

Thermo-physical Properties Measurements of an Insulating Material Extracted from Different Date Palm Trees

Oaddi¹,

Tiskatine²,

Boulaid³

et al. 2019

I2M

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During the last few decades, natural materials appear as a viable solution to current environmental problems and have been of interest to industry and researchers. The aim of this paper is to analyze the thermo-physical properties of a natural material extracted from three varieties of local date palm waste, called petiole, namely Boufeggous, Hafsa and Sair from Tinghir oasis, southern Morocco. A Transient Plane Source (TPS) method was used to measure the thermal conductivity and diffusivity of the proposed materials at different temperatures (40 °C, 60 °C, 80 °C, 100 °C, and 120 °C). The thermo-physical properties, according to the orientation of the fibers at ambient temperature and atmospheric pressure, have been also conducted and analyzed. Furthermore, a scanning microscopy (SEM) analysis of the samples was conducted to characterize the palm microstructure. The results reveal low values of thermal conductivity which were about 0.070 W/m.K. The microstructure analysis indicate that the proposed material is a highly porous and satisfies the thermal requirements of an insulating material. It worth to mention that this material will be used as insulation for a solar box cooker to reduce heat losses and enhance its performance.

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Thermo-physical analysis of low-cost ecological composites for building construction

Cited by 34 publications

References 59 publications

Physico-Mechanical and Hygro-Thermal Properties of Compressed Earth Blocks Stabilized with Industrial and Agro By-Product Binders

Physico-Mechanical and Hygro-Thermal Properties of Compressed Earth Blocks Stabilized with Industrial and Agro By-Product Binders

Thermal conductivity of clay based material incorporating Argan Shell: Experimental characterization

Thermo-physical Properties Measurements of an Insulating Material Extracted from Different Date Palm Trees

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