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Thermal Characterization of Concrete and Cement Mortar from Construction Sites and Industrial Production Units in the City of Ouagadougou with a View to Standardization in Energy Certification

Materials Sciences and Applications（材料科学与应用期刊） 2023年第7期

作者： Sidpouita Mathilde Koudougou Hamma Fabien Yonli Moussa Sougoti david Yemboini Kader toguyeni

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Engineering（科研） 2023年第6期15卷 396-415页

作者： Saïdou Bamogo Fati Zoma Etienne Malbila david Y. K. toguyeni Laboratory of Physics and Chemistry of Environment (LPCE) University JKZ-UFR Ouagadougou Burkina Faso Laboratory of Thermal and Renewable Energy (LETRE) University JKZ-UFR Ouagadougou Burkina Faso Polytechnic School of Ouagadougou (EPO) Ouaga Burkina Faso

The present study allowed to carry out a thermal characterization of concrete and cement mortar. Thermal tests were carried out with the KD2 Pro device, on concrete and mortar samples taken from twenty-six (26) construction sites of office buildings and two (2) industrial production units in the city of Ouagadougou. The tests were carried out on rectangular specimens after four weeks (4) of conservation on the site of construction or production of materials. This study seeks to determine the thermal properties of the materials, in particular the thermal conductivity, the thermal diffusivity and the thermal capacity of the samples, in the real conditions of execution of the buildings and environment. The thermal conductivity varies from 1.413 to 1.965 W/m·K, 0.940 - 1.658 W/m·K and 0.703 - 1.149 W/m·K respectively for concrete, cinder block mortar and plaster mortar. Regarding the other properties, especially the capacity and thermal diffusivity, the values vary respectively, from 1070.59 - 1974.67 kJ/kg·K and (3.74 - 6.70) × 10-7 m2/s for concrete, from 1123.69 - 1586.81 kJ/kg·K and (3.38 - 5.65) × 10-7 m2/s for plaster mortar and 1202.51 - 1736.01 kJ/kg·K and (3.82 - 7.36) × 10-7 m2/s for the mortar of building blocks. The conductivity, capacity and thermal diffusivity of industrial mortar vary from 1.019 - 1.229 W/m·K, 792.18 - 1862.58 J/kg·K and (2.75 - 6.80) × 10-7 m2/s, respectively. Only the correlations made between the thermal properties and the density of the samples of the plaster mortar, give good relations namely R2 = 0.9308 for the thermal conductivity, R2 = 0.7823 for the thermal capacity and R2 = 0.9272 for the thermal diffusivity. This study contributes to the establishment of a thermal regulation in Burkina Faso for the adoption of the West African Economic and Monetary Union (WAEMU) Directive 05 on energy efficiency in buildings.

关键词： Concrete Mortar Thermal Conductivity Thermal Capacity Thermal Diffusivity

Adding Hydrated Lime in a Material Made of Clayey Soil and Fibres: Formulation and Effects on Thermo-Mechanical Properties

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Journal of Minerals and Materials Characterization and Engineering 2020年第3期8卷 149-161页

作者： Fati Zoma Fabien H. Yonli Etienne Malbila david Y. K. toguyeni Ivon B. Hassel Laboratory of Physics and Chemistry of Environment University Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratory of Thermal and Renewable Energies University Joseph KI-ZERBO Ouagadougou Burkina Faso Department of Engineering Sciences Division of Applied Mechanics Uppsala University Uppsala Sweden

In this study, we have focused our investigations on effect of adding hydrated lime on a locally made composite material, based on clayey earth (soil) and Hibiscus sabdariffa fibres, for envelope (walls) in the building. Prior to sample’s formulation, we selected an appropriate mineral (soil) material based on criteria as: plasticizer power for good workability, dense coarse particles to withstand loads and finally porous structure to take advantage of air insulating character. We then formulated, following a mixing process by shearing and compaction by vibration that we recommend, two composite materials (A), (B) which contain respectively 1% Fibres plus 1% lime, 1% Fibres plus 3% lime. We determined thermal properties by the mean of KD2 Pro thermal analyzer, compression strength accordingly to the standard NF P 18-406, porosity following volumetric and gravimetric methods and pH of soil-hydrated lime solution. As results, up to 5% of hydrated lime, the measured pH is inferior to 12: mineralization of vegetal fibres is highly unlikely. Moreover, we observe that the addition of hydrated lime resulted in a reduction in the number of cracks and their depths;Samples (A) and (B) have a rather compact appearance than the case 1% Fibres without lime (material (C)). Furthermore, with lime stabilization, the insulating potential is improved while the thermal inertia has been deteriorated compared to material (C). However, compressive strength decreases with lime, which could be due to the presence of fibres that would inhibit the hardening of the lime. At last, with 3.39% ± 3.07% MPa, 2.27% ± 11.30% MPa for samples (A), (B) respectively, the minimum required by CRATerre-EAG (guide of CDI, 1996) for construction of envelope (walls) of single storey (ground floor) buildings is met.

关键词： Local Material Hydrated Lime Hibiscus sabdariffa Fibre Thermo-Mechanical Properties Porosity

Experimental Evaluating of the Physical, Mechanical and Durability Properties of Natural, Recycled and Both Combined Aggregates Based Concretes

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Materials Sciences and Applications 2023年第3期14卷 117-141页

作者： Etienne Malbila Arba A.T. Ouedraogo Nicolas Kagambega Gilbert G. Nana Sié Kam david Y. K. toguyeni Ecole Supérieure d’Ingénierie (ESI) Université de Fada N’Gourma (UFDG) Fada-N’Gourma Burkina Faso Laboratoire d’Energies Thermiques Renouvelables (LETRE) Université Joseph KI ZERBO Ouagadougou Burkina Faso Laboratoire de Géosciences et Environnement (LaGE) Université Joseph KI ZERBO Ouagadougou Burkina Faso Laboratoire de Physique et Chimie de l’Environnement (LPCE) Université Joseph KI ZERBO Ouagadougou Burkina Faso Ecole Polytechnique de Ouagadougou (EPO) Ouagadougou Burkina Faso

This experimental study aims at the reuse of recycled aggregates (RA), resulting from the demolition of concrete, cement block and cement mortar, in the manufacture of common construction in Burkina Faso. The RA can readily replace natural aggregates in concrete. Then five formulations of natural and recycled aggregates based concrete for characteristic strength of 25 Mpa were prepared in addition to the natural aggregates base concrete named reference concrete (BN): two types of recycled aggregates concrete (BR), three types of recycles and natural combined aggregates base concrete (BC). The properties of natural and recycled aggregates were characterized and the physical, mechanical strength and durability properties were also evaluated for all concrete specimens. All the studied concrete formulation present a density between 2000 kg/m3 ≤ ρ ≥ 2600 kg/m3 and an average slump of 4.9 ± 0.1 cm. The obtained results indicate that the recycled aggregates are suitable for current concrete. Two out of the five combinations studied, such as the natural (BN) and combined aggregate (BC2) based concretes satisfy the mechanical characteristics (Rc28 > 25 MPa) at 28 days of age and an average absorption coefficient of 2.93% and 3.98%. The recycled aggregate based concrete (BR1, BR2) and combined aggregate based concrete (BC1), gave respective average compressive strength of 21.55 MPa, 20.50 MPa and 20.30 MPa, i.e. a difference of 13.80% to 18.80% under the characteristic strength (25 MPa) aimed at 28 days of age. Thus, the recycled aggregates are in conformity with the normative prescriptions and their use for standard concrete gives adequate physical, mechanical and durability properties for the production of the C20/25 concrete series in the common civil engineering applications.

关键词： Concrete Demolition Waste Aggregate Recycled Aggregate Strength Water Absorption

Design of Watertight Barriers for Retention Ponds of Cyanide Using Sludge from Water Purification Station （Ziga）

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材料科学与工程（中英文B版） 2014年第6期4卷 186-193页

作者： david Y.K. toguyeni Fabien Yonli Laboratoire de Physique et Chimie de l 'Environnement (LPCE) UniversitO de Ouagadougou Burkina Faso

Estimation of the Equivalent Design Temperature of a Pavement in Burkina Faso

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材料科学与工程（中英文B版） 2022年第2期12卷 41-49页

作者： Abdoulaye Koanda Sidpouita Mathilde Koudougou david Y.K.toguyeni Institut du Génie des Systèmes Industriels et Textiles Ecole Polytechnique de OuagadougouOuagadougouBurkina Faso Laboratoire de Physique et de Chimie de l’Environnement OuagadougouBurkina Faso UniversitéJoseph Ki-Zerbo OuagadougouBurkina Faso

The bituminous pavements of the city of Ouagadougou(Burkina Faso)are made using old design methods which take into account the climate from the notion of equivalent *** an equivalent temperature of 30°C is often used for the design of bituminous *** observation that has been made is that this temperature does not currently make it possible to reduce the problems of early degradation of the pavements linked to meteorological *** objective of this article is to propose a numerical approach for determining the equivalent temperature from temperature measurements taken at the surface of the *** approach consists in jointly using the Alizé-Lcpc sizing software and the Comsol Multiphysics software using the finite element *** a four-layer bituminous pavement,located at 12.38°North and 1.48°West,in Ouagadougou,consisting of a surface course of bituminous concrete of 8 cm and a base course of gravel bitumen of 16 cm,an equivalent temperature of 35°C was obtained.

关键词： Asphalt mixes pavement design equivalent temperature

Experimental Evaluating of the Physical, Mechanical and Durability Properties of Natural,Recycled and Both Combined Aggregates Based Concretes

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