The study of the performances of the Archean of man gneiss aggregates with the addition of filler to replace the basalt of Kasila organization inside the asphalt and urban mix design of southern Sierra Leone is offered on this document. The purpose is to compare the consequences of the asphalt and urban mix design with gneiss and basalt combination. The carried out strategies and design used are 1) Volumetric layout and Marshall method for the asphalt, 2) French Dreux-Gorisse technique for the concrete. We introduced 2% of gneissic filler and a pair of% portland cement kind 42.5 R to the asphalt warm blend with the gneiss aggregates to comply with the standards version. The Marshall, the diametric compression and the Duriez checks require us to perform 4 one-of-a-kind types of blend design. The 4 blend designs meet the requirements but F2 and F4 give the high-quality mechanical homes. F2 (gneiss + 2% filler) and F4 (basalt) have many similarities from which we are able to finish their interchangeability. F2 offers 5255 of gold standard bitumen content material. in regards to hydraulic concrete, the effects of the compressive power check (cement content material 350 kg CMI forty two.5 R/m3) with the gneiss and basalt aggregates are respectively 40 MPa and 45 MPa at 28 days curing: these values are greater than 35 MPa required through the technical specs. using the superb Fluid ® Thermoplast 120 admixture, to boom the concrete compressive strength, is justified by way of the requirement of not less than 80% Rc28 at 24 hours. For each sorts of concrete, we’ve got at 24 hours, 34 and 35 MPa which might be higher than the minimum of 32 MPa (in 24 h). these effects meet the requirements of the technical specifications.
a great avenue community with good infrastructure is crucial to create a suitable environment for monetary development. In West Africa, a few economically strategic areas are nevertheless remoted because of negative road situations.
As a part of the Mano River cooperation between Liberia, Sierra Leone and Guinea, it’s miles deliberate to link Monrovia (Liberia) and Conakry (Guinea) via BO (Southern Sierra Leone).
a good way to join Liberia and southern Sierra Leone, the european development Fund has financed the Bandajuma-Mano River section, that’s 103 km long.
however, the Bandajuma-Mano river undertaking crosses the gneiss of the Archean domain of man [1].
it’s miles in this context that studies is being conducted on gneiss alternatively for the long-used basalt.
to meet the goals of this examine, the subsequent will be finished:
a) The geological review will offer a presentation of the nearby geology of southern Sierra Leone.
b) Asphalt mix layout further to the Marshall checks, the water sensitivity can be evaluated by the Duriez test. the use of a mathematical method, elastic modulus values could be calculated to assess the behavior of asphalt blend layout with the compaction level.
c) The Concrete mix layout with gneiss aggregates will permit the willpower of its compatibility with Portland cement and its overall performance as compared with basalt aggregates.