Influence of the Hydric State and Lime Treatment on the Thermal Conductivity of a Calcareous Tufa

Mekaideche, Khalffallah; Derfouf, F-E. M.; Laïmeche, A.; Abou-Bekr, Nabil

doi:10.28991/cej-2021-03091663

Cited by 6 publications

(4 citation statements)

References 30 publications

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“…This heat increase depended on the thermal conductivity of wall material used. Materials with decreased water content and a high degree of saturation would cause a decrease in thermal conductivity; thermal insulation can increase significantly (Mekaideche et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Determination of the Biowall Effective Area to Induce Holistic Sensory Comfort

2024

Issue 4 (In Progress)

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<p>Biowalls are a new phenomenon in interior urban areas, which has proven to contribute positively to sensory comfort. But people use biowalls in different dimensions. Based on field facts, determining the biowall dimensions for human sensory comfort has not emphasized clear principles. The research aims to obtain the effective area of a biowall inducing sensory comfort comprehensively and simultaneously in tropical landed dwellings. Therefore, this study used the experimental method to extract the effective areas of the biowall to generate thermal, audial, visual, and respiratory comfort. The analysis was mathematically conducted through polynomial quadratic equations and directly or inversely proportional to the overall value regarding a generalization attempt. The variables measured included temperature, humidity, surface temperature, reverberation time, noise reduction, illuminance, luminance, and colour mapping, as well as levels of CO2, TVOC, HCHO, and PM2.5. The result showed that biowall effective area inducing thermal, audial, visual, and respiratory comfort for a (3000 x 3000 x 2500) mm3 room was 2.5 modules or 12.5 m2 leaf area. This value was able to provide an increase in the sensory comfort level for the thermal, audial, visual, and respiratory variables by 59.22 %, 76.64 %, 32.35 %, and 98.88 %, respectively.</p>

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Section: Discussionmentioning

confidence: 99%

Determination of the Biowall Effective Area to Induce Holistic Sensory Comfort

2024

Issue 4 (In Progress)

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“…Dependence of the average increase in oil production rate on the logarithm of the relative frequency exposure. The flow rates of production wells increased due to changes in the permeability of rocks [22,23].…”

Section: Experience In the Use Of Wave Action In The Perm Regionmentioning

confidence: 99%

Influence of Frequency of Wave Action on Oil Production

Poplygin¹,

Гузев

et al. 2022

IJE

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When elastic waves act on rocks, the structure of the void space changes. The nucleation and formation of new cracks is possible. Wave action technologies are divided into two groups: with a frequency of less than 100 Hz and a frequency of more than 1 kHz. In the intermediate zone, no completed works and studies of wave action were found. The paper studies the results of the impact of elastic waves with different frequencies and amplitudes on oil production. With low-frequency exposure, an increase in permeability values is noted to a greater extent due to the appearance of new and an increase in the size of existing cracks. With high-frequency exposure, the viscosity of reservoir oil is greatly reduced. The greater the value of the initial viscosity, the more intense it decreases when exposed to highfrequency waves. For the Perm Territory, a comparison was made of the results of wave processing of production wells depending on the frequency of exposure. As the impact frequency increases, the average oil recovery after wave treatment decreases. With an increase in the frequency of exposure, the duration of operation of a well with increased oil production after wave treatment decreases. Models have been obtained to predict the time of operation of wells with additional oil production, additional oil production and an increase in oil production rate of wells after wave action. As a result, it can be noted that the most effective technologies are those with a lower frequency, but a large amplitude of exposure.

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“…As for shear strength, an increase in shear strength was observed with an increase in limestone sand residues content. The thermal conductivity of a raw and lime-treated calcareous tuff was analyzed during the drying process by Mekaideche et al [24]. Results show that the drying process and the lime treatment contributed to the reduction of the thermal conductivity of the studied material.…”

Section: Introductionmentioning

confidence: 99%

Co-valorization of Tuff and Sandy Residues in Roads Construction

et al. 2022

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In recent years, the use of local materials in pavements has developed to compensate for the lack of normalized standard materials in the Algerian arid regions. The main objective of this research is to assess the co-valorization of two local materials to design a road material with satisfactory characteristics. In this context, the use of tuff in combination with sand residues is explored. The evolution of the characteristics of tuffs mixed with sand residues according to percentages ranging from 0% to 50% is highlighted. The used materials were subjected to physical and mechanical tests. Then, a series of mechanical tests were carried out on mixed samples compacted at the optimal characteristics that were deduced from the modified Proctor test. The obtained results highlight the existence of an optimal formulation composed of 70% tuff and 30% sandy residues, which presented an unconfined compressive strength (UCS) of 5.16 MPs and a CBR index (CBRI) of 42.6 %. Moreover, the results show clearly the evolution of the measured characteristics with time (drying) and without the addition of binders. The possibility of the use of studied mixtures in pavements has been verified regarding the recommendations in use (CTTP 2001) and the Saharan Road Technique (SRT). Doi: 10.28991/CEJ-2022-08-05-013 Full Text: PDF

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Influence of the Hydric State and Lime Treatment on the Thermal Conductivity of a Calcareous Tufa

Cited by 6 publications

References 30 publications

Determination of the Biowall Effective Area to Induce Holistic Sensory Comfort

Determination of the Biowall Effective Area to Induce Holistic Sensory Comfort

Influence of Frequency of Wave Action on Oil Production

Co-valorization of Tuff and Sandy Residues in Roads Construction

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