Improvement of cob thermal inertia by latent heat storage and its implication on energy consumption

Alassaad, Farjallah; Touati, Karim; Levacher, Daniel; Mendili, Yassine El; Sebaïbi, Nassim

doi:10.1016/j.conbuildmat.2022.127163

Cited by 16 publications

(15 citation statements)

References 72 publications

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“…Alassaad et al have used two types of soil; the first's Unified Soil Classification (UCS) as low plasticity silt (ML) with a plasticity of 24% and a plasticity index of 3.6%, and the second's USC as silty sand with gravel (SM), which had a plasticity of 21% and a plasticity index of 2.7%. In the same study, both soils have quartz, mica, feldspar, iron oxyhydroxides, and limonite [21].…”

Section: 1mentioning

confidence: 76%

“…The selection and creation of the soil that will be used in the mix have a significant impact on the materials' structural and hygrothermal performance [12,13,[21][22][23]. The used soil needed to be obtained from a local source, which would help in the reduction of the embodied carbon emissions caused by transportation, as will be discussed later in the review.…”

Section: 1mentioning

confidence: 99%

“…Alassaad et al have established the added water content as a ratio, where the water-to-soil ratio was equivalent to 0.3 [39]. Alhumayani et al in their paper have used an amount of 20 kg of water, which have resulted in a ratio of 1:4 concerning the soil content in the mix [25] which aligns with Weismann and Bryce, who proposed a water-to-subsoil ratio of one part water to every four parts soil [40].…”

Section: 2mentioning

confidence: 99%

“…The fibre content in the majority of studies ranged from 0.6% to 3%. Alassaad et al have used 2.5% flax straw of the dry soil mass [39]. In parallel, Ben-Alon et al in their research have used 10.1 kg of wheat straw that is added to 256 kg of clay-rich soil with a calculated soil/fibre ratio of 0.039 [3].…”

Section: Fibres and Aggregates In Cob Mixturesmentioning

confidence: 99%

“…In his experiments, it was observed that the addition of PCMs will reduce the density of the samples as well as the mechanical strength of cob where the Unconfined Compressive Strength of cob decreased and became more ductile. The density of cob samples that had the Micronal DS 5038 X added was approximately 1500 kg/m3 [39]. Zeghari et al's study resulted in a density range between 1107 kg/m3 and 1583 kg/m3 for structural walls, while the density of insulation walls was less than 700 kg/m3 [14].…”

Section: Bulk Density Of Specimensmentioning

confidence: 99%

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The State of the Art of Cob Construction: A Comprehensive Review of the Optimal Mixtures and Testing Methods

2023

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Earthen construction systems have potential hygrothermal, and environmental benefits over conventional building materials such as concrete. However, such systems are not yet fully optimised to be part of an energy-efficient building. Therefore, to further optimise the material, this review explores peerreviewed research articles that relate to different materials used in cob mixes and the different testing methods used to assess the produced specimen's hygrothermal performance. For data collection, a systematic keyword search was carried out on ScienceDirect, Scopus, Google scholar search engines and relevant books. The filtering of journal articles was based on studying the abstracts followed by analysing their content within the scope of the review. The results show that the soil's constituents and the added fibre ratios critically affect the percentages of clay and water added to the mixture. Fibres' impact on the mix was experimented with by multiple researchers using distinct types of plant aggregates. The percentage of fibre addition ranged between 0.9% and 3% for structural specimens and reached 25% for non-structural specimens with optimised insulation properties. However, there is no consensus and robust collated data available about the ratios of the mixes concerning the hygrothermal performance of the specimens. Therefore, a matrix for mixes and testing methods was developed with the available data to aid the progression of any future optimisation effort.

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Section: 1mentioning

confidence: 76%