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Behavior of sediment from the dam FERGOUG in road construction
Benaissa, Assia,Aloui, Zehour,Ghembaza, Moulay S.,Levacher, Daniel,Sebaibi, Yahia Techno-Press 2016 Advances in concrete construction Vol.4 No.1
In Algeria, wastes are often stored in such conditions that do not meet standards. Today and more than ever, we really must implement an environmentally management of wastes. Recovery of waste in Algeria has a considerable delay due to the absence of a policy favorable to the development of waste management. But many researchers have shown the possibility to reuse dredged sediments in road construction. Through Europe, recent research works have been already performed on dam sediments. Present study fits into the context of the valorization of dredged sediments from Fergoug dam. They are found in considerable quantities and mainly composed of mineral phases, organic matters and water. The reservoir sedimentation poses problems for the environment and water storage, dredging becomes necessary. Civil engineering is a common way of recycling for such materials. Dredged sediments have not the required mechanical characteristics recommended by the standards as GTR guide (LCPC-SETRA 1992). So as to obtain mechanical performance, dredged sediment can be treated with cement, lime, or replaced materials like quarry sand. An experimental study has been conducted to determine physical and mechanical characteristics of sediments dredged from dam. Then different mixtures of sediment and/or quarry sand with hydraulic binders are proposed for improving the grain size distribution of the mixes. Finally, according these mixtures, different formulations have been tested as alternative materials with dredged sediments.
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Nabila Belyagoubi-Benhammou,Larbi Belyagoubi,Nadjat Bechlaghem,Nacéra Ghembaza,Fawzia Atik-Bekkara 경희대학교 융합한의과학연구소 2017 Oriental Pharmacy and Experimental Medicine Vol.17 No.1
The antioxidant activity of the crude hydroalcoholic extract (PSMW) and its derived fractions n-hexane (PSH), diethylic ether (PSDE), chloroforme (PSC), ethyl acetate (PSEA), n-butanol (PSB) and residual aqueous fraction (PSA) of aerial part of endemic plant Pituranthos scoparius was performed using three in vitro tests : phosphomolybdate assay, reducing power and DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging capacity. The total yield, total phenolic (TPC), flavonoid (TFC), flavonol (TF) and condensed tannin contents (TCT) of all the fractions were also determined. This plant was also subjected to preliminary phytochemical screening test for various constituents. Phytochemical screening revealed the presence of flavonoids, tannins, coumarins, saponins and steroids in the extracts. Amongst the extracts, PCMW showed the highest TPC (8.40 ± 0.01 mg gallic acid equivalent/g of dry matter), TFC (2.25 ± 0.01 mg catechin equivalent/g), TF (1.19 ± 0.04 mg quercetin equivalent/g) and TCT (1.07 ± 0.16 mg catechin equivalent/g). The Total Antioxidant Capacity (CAT) was found to be varied in different fractions from 0.11 ± 0.00 to 10.02 ± 0.02 mg ascorbic acid equivalent/g). Therefore, PSEA showed the highest antioxidant activities to reduce iron (IC50 = 1.19 ± 0.00 mg/mL) and to scavenge DPPH (IC50 = 0.91 ± 0.02 mg/mL).
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