Thermophysical and Mechanical Properties of Compressed Earth Blocks Containing Fibres: By-Product of Okra Plant and Polymer Waste

Nshimiyimana, Philbert; Hema, Césaire; Zoungrana, Ousmane; Messan, Adamah; Courard, Luc

doi:10.2495/arc200121

Cited by 7 publications

(4 citation statements)

References 31 publications

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“…The curing was carried out in ambient conditions, at the production moisture, for 45 days and 28 days respectively for CEBs stabilised with lime or lime:ash [10] and cement [18]. The cured CEBs were dried to constant mass [5], before the treatment by exposure to various conditions.…”

Section: Materials and Methods For The Production Of Cebsmentioning

confidence: 99%

Durability Performances of Compressed Earth Blocks Exposed to Wetting–drying Cycles and High Temperature

Nshimiyimana

Hema

Sore

et al. 2022

WIT Transactions on the Built Environment

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The environmental durability of earthen materials is among the main factors that limit their widespread acceptance in the contemporary building sector. This study assesses the performances of compressed earth blocks (CEBs) before and after exposure to the wetting-drying (WD) cycles and high temperature. The CEBs were produced from kaolinite-rich earth material stabilized with lime-rich residue (5%-25%) or the lime substituted with rice husk ash, lime:ash (20:0%-12:8%) or cement (4%-8%), with respect to the mass of dry earth. The CEBs were cured for 28-45 days and at the ambient temperature of a laboratory of 30±5°C and the moisture of production, necessary for the reactivity of the binders and improvement of the performances of CEBs. The CEBs were dried before testing their initial compressive strength. Their compressive strength was also tested after exposure to 12 cycles of wetting in water for 6 hours at 30±5°C and drying in the oven for 42 hours at 70±5°C. Additionally, it was tested after exposure to the elevated temperature of 150-600°C. After exposure to the WD cycles, the compressive strength of CEBs relatively increased, by up to 49% (4.6 to 6.8 MPa) for CEBs stabilized with lime (15%) and by up to 40% (4.4 to 6.2 MPa) with lime:ash (20:0%), with respect to their strength before the WD cycles. The maximum increase of the strength was observed for CEBs containing a higher amount of lime, related to the reaction of excess lime which resulted in the formation of more cementitious products and improvement of the strength of CEBs. Nevertheless, the compressive strength decreased by 55% (12.5 to 5.5 MPa) for the CEBs stabilized with cement (4%), resulting from the degradation of the initial cementitious products. However, the strength increased by up to 58% (4.2 to 6.6 MPa) for the CEBs stabilized with cement (8%) after exposure to 600°C. This implies that the stabilization of CEBs with lime-rich binder is more resilient to the WD cycles than cement. It also shows that the cement stabilized CEBs would at least retain their strength after exposure to high temperature.

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Section: Materials and Methods For The Production Of Cebsmentioning

confidence: 99%

Durability Performances of Compressed Earth Blocks Exposed to Wetting–drying Cycles and High Temperature

Nshimiyimana

Hema

Sore

et al. 2022

WIT Transactions on the Built Environment

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“…In the local context of Burkina Faso, similar studies have specifically focused on the stabilization using industrial binders (cement or lime), geopolymer binders, plant fibers or industrial and agricultural by-products in order to enhance the physical and mechanical performances and durability of CEB for applications in building wall constructions (Ouedraogo et al, 2015;Nshimiyimana et al, 2018;Sore et al, 2018;Nshimiyimana et al, 2020aNshimiyimana et al, , 2020bNshimiyimana et al, , 2020cNshimiyimana et al, , 2020dNshimiyimana et al, forthcoming). Additionally, a number of studies has assessed the potential of CEBs as masonry material for improving the indoor comfort and potentially reduce the energy consumption for air-conditioning (Hema et al, 2017;Moussa et al 2019;Hema et al, 2020;Hema et al, forthcoming).…”

Section: Introductionmentioning

confidence: 99%

The Paradox around the Social Representations of Compressed Earth Block Building Material in Burkina Faso: The Material for the Poor or the Luxury Material?

Zoungrana¹,

Bologo²,

Traoré³

et al. 2021

JSS

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Compressed earth brick (CEB) is a masonry material which has the thermal properties that are better adapted to the hot and dry climate of tropical and Sahelian context like in Burkina Faso. Despite these advantages, CEB are still not largely used in the construction sector in the city of Ouagadougou. In order to better understand the obstacles linked to this low diffusion of CEB, the present empirical study proposes a deep analysis of the social representations of construction using CEB in the urban place. The results show that four main categories of social representations coexist in the construction sector using CEB: 1) the perception of CEB as the "material for the poor", 2) the perception of CEB as "improved or precarious adobe" inherited from successive public policies to rehabilitate the material, 3) the symbolic perceptions linked to the red color of the brick and the durability of the material, and 4) the contemporary post-materialist perception (luxury materials), according to a minority of wealthy elites who have built their houses using CEB. These social representations are essential to take into consideration for the implementation of new public housing policies in general and promotion for the usage of CEB in particular. This could accompany the studies which aim at improving the technical performances of CEB and lead towards the socio-economic acceptance of the materials.

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“…One can note how the available scientific literature mainly focuses on experimental analyses to assess the macroscopic mechanical performance of various fibre-reinforced CEBs [18,19,[22][23][24][25][26][27][28]. Authors usually investigate the flexural and tensile strengths by threepoint bending and tensile splitting tests, respectively.…”

Section: Introductionmentioning

confidence: 99%

Artificial Neural Networks to Predict the Mechanical Properties of Natural Fibre-Reinforced Compressed Earth Blocks (CEBs)

Turco

Funari

Teixeira

et al. 2021

Fibers

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The purpose of this study is to explore Artificial Neural Networks (ANNs) to predict the compressive and tensile strengths of natural fibre-reinforced Compressed Earth Blocks (CEBs). To this end, a database was created by collecting data from the available literature. Data relating to 332 specimens (Database 1) were used for the prediction of the compressive strength (ANN1), and, due to the lack of some information, those relating to 130 specimens (Database 2) were used for the prediction of the tensile strength (ANN2). The developed tools showed high accuracy, i.e., correlation coefficients (R-value) equal to 0.97 for ANN1 and 0.91 for ANN2. Such promising results prompt their applicability for the design and orientation of experimental campaigns and support numerical investigations.

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Thermophysical and Mechanical Properties of Compressed Earth Blocks Containing Fibres: By-Product of Okra Plant and Polymer Waste

Cited by 7 publications

References 31 publications

Durability Performances of Compressed Earth Blocks Exposed to Wetting–drying Cycles and High Temperature

Durability Performances of Compressed Earth Blocks Exposed to Wetting–drying Cycles and High Temperature

The Paradox around the Social Representations of Compressed Earth Block Building Material in Burkina Faso: The Material for the Poor or the Luxury Material?

Artificial Neural Networks to Predict the Mechanical Properties of Natural Fibre-Reinforced Compressed Earth Blocks (CEBs)

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