Experimental investigation of mixtures of bentonite and dredged sediments from Chorfa dam in Algeria

Abstract

Geotechnical properties of dredged sediment from Chorfa dam in Algeria and their mixtures (5%, 10%, 15%, 20%, and 25%) with bentonite were investigated through a series of laboratory experimental tests in order to investigate possibilities of their usage as a barrier against the spread out of the Sebkha of Oran in the northwest of Algeria. Grain size and Atterberg limits tests, chemical and mineral analyses, and compaction, vertical swelling, and horizontal and vertical permeability tests were performed on the soils and their mixtures using tap water and the salty Sebkha water. The results indicate that the bentonite specimens remolded and inundated with Sebkha salty water have less swell potential than those prepared with tap water. The addition of bentonite to Chorfa sediment increases the density, limit liquid, specific surface, and swell potential of the mixtures. Compaction tests show a decrease in the optimum moisture and an increase in maximum dry densities as the bentonite content increases. The horizontal and vertical permeabilities decrease relatively with the addition of bentonite.

The Assessment and Treatment of Dredged Sediments and Limestone Tuff Using Waste Ceramic with Low-Cement

“…In the world, 600 million m 3 of sediments are dredged out each year from the principal maritime and commercial harbors [1]. In Algeria, the annual volume of the dredged sediments (collected from dams) is about 50 million m 3 [2]. These significant volumes of materials can represent a very interesting source of raw materials, especially for the aggregates consuming sector.…”

“…The sediments used in this study were removed from the Fergoug dam area in the Perregaux region (North-West of Algeria). This dam with an initial capacity of 17 million m 3 (in 1970) is the first having been dredged in Algeria from 1986 to 1989 with over 10 million m 3 of dredged mud [2]. The surface area of the perch dam is estimated at 8340 km 2 .…”

“…This dam with an initial capacity of 17 million m 3 (in 1970) is the first having been dredged in Algeria from 1986 to 1989 with over 10 million m 3 of dredged mud [2]. The surface area of the perch dam is estimated at 8340 km 2 . The average altitude is 790 m with a maximum altitude of 1454 m [3].…”

Assessment of the Performance of Sediments and Scrap Rubber Layers to Filter the Leachate of Landfills

“…Even surface water (dams) is itself exposed to as a result of the paucity of the sedimentation up of dams, The world's reservoirs are currently filling with sediments at a rate of approximately 1% per year [11,12]. This implies that within about 50 years world's water storage in reservoirs will be half of the current storage, which will have large economic and environmental consequences [13]. Fergoug dam is one of many others that have such problems.…”