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Lakrafli H.,Moulay Ismai University | Tahiri S.,Laboratoire Of Leau Et Of Lenvironnement | Albizane A.,Moulay Ismai University | El Otmani M.E.,Laboratoire Public Dessais Et Detudes Lpee
Construction and Building Materials | Year: 2012

This paper presents an experimental study of the effect of adding leather wastes, namely chrome shavings (CS) and buffing dust (BD), on mechanical and thermal properties of cement and plaster composite specimens. Obtained results show a significant decrease of density, mechanical strength and thermal conductivity with an increase of tannery wastes content. On the other hand, experimental study has been carried out to determine thermophysical properties of hollow specimens filled with different amounts of tannery wastes and of boards separated by different mass of CS or BD. The determination of the thermal conductivity of all samples allowed us to demonstrate that the incorporation of tanned wastes in cement or plaster formulation and their use as separation or filling materials increases considerably the thermal insulation capacity. In order to avoid decrease of mechanical strength, leather wastes can be used to fill hollow specimen or to separate panels. © 2011 Elsevier Ltd. All rights reserved. Source


Lakrafli H.,Moulay Ismai University | Tahiri S.,Laboratoire Of Leau Et Of Lenvironnement | Albizane A.,Moulay Ismai University | Bouhria M.,Moulay Ismai University | El Otmani M.E.,Laboratoire Public Dessais Et Detudes Lpee
Construction and Building Materials | Year: 2013

This research work is focused on analyzing the potential application of two leather wastes (wet-blue chrome shavings (CS) and leather buffing dust (BD)) and two carpentry wastes (wood shavings (WS) and sawdust (SD)) as alternative building thermal insulation materials. These industrial solid wastes are used as filling materials for hollow specimens and as separation material for cement/sand panels and plasterboards. It was experimentally investigated the effect of weight/volume ratio and moisture on thermal conductivity of composite specimens and material wastes. It was shown that conductivity increases with the increase of moisture content. Thermal conductivity of dry material wastes deposited between plasterboards and cement boards was then evaluated. The thermal conductivity measurements show clearly that these industrial solid wastes can compete with other insulating materials. © 2013 Elsevier Ltd. All rights reserved. Source


Salhi A.,Laboratoire Of Leau Et Of Lenvironnement | Aarfane A.,Laboratoire Of Leau Et Of Lenvironnement | Tahiri S.,Laboratoire Of Leau Et Of Lenvironnement | Khamliche L.,Laboratoire Of Chimie Organique | And 4 more authors.
Journal of Materials and Environmental Science | Year: 2014

In this work, the degradation of Orange Acid 7 (OA7) dye by heterogeneous photocatalysis using a non-stoichiometric hydroxyapatite doped with titanium was investigated. First, the developed catalyst was characterized by different analytical techniques such as XRD, FTIR and TGA-DTA. Its effectiveness in degrading OA7 dye was then studied in a batch reactor. The effect of several parameters such as concentration, pH and irradiation time on photodegradation efficiency was investigated. Obtained results show that composite material HAP-Titanium has a significant photocatalytic activity complete discoloration of dying solution can be achieved after 16 hours of irradiation. Results show that discoloration performance depends on the catalyst mass, its titanium content, the initial dye concentration and the presence of oxygen in medium. However, photodegradation is little affected by the variation of pH of treated solutions. Increasing the mass of the catalyst and its percentage of titanium improves considerably the efficiency and the speed of discoloration. The optimum mass of the catalyst HAP-Titanium (Ti 11%) is about 2 g per liter of solution. Obtained results also show that discoloration yield decreases by increasing the initial concentration of dye and that the presence of oxygen in medium improves further the phodegradation phenomenon. Source

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