Valuation of Local Materials in Road Construction in Arid Zones

Abstract

The materials constituting the pavement bodies, until today, have been limited to certain so-called noble materials (rolled sands, aggregates, etc.), but these are in the process of being exhausted under the effect of intensive exploitation and the scarcity of quality quarries. With the objective of preserving the deposits of aggregates in the process of exhaustion for future generations and of exploiting the aeolian sands in abundance in the regions of southern Algeria, we aim to enhance the latter in the body of the roadway mixed with the tuffs, this would imply a reduction in construction costs (use of local aggregates of lower quality available in large quantities, reduction in transport costs). From an environmental point of view, this would limit the impacts with a reduction in CO2 emissions linked to transport. In this work, we applied a new approach based on the technique of mixtures to valorize and exploit the sand of dunes existing in abundance, with the treatment in hydraulic binders, which allowed us to go up to 20% of sand dunes

Study of the Effect of Adding Dune Sand to Tuff in Saharan Road Construction

“…To improve the compactness, we opted for a correction of the particle size by substituting a fraction of (x %) of tuff by adding dune sand, with (x %) varying from 10 to 40. In order to find the optimum composition of the mixture, compaction and bearing tests were carried out on the different mixtures of tuffs and dune sands [24][25][26][27][28][29][30][31][32]. Simple compression tests at different ages were performed on specimens of different mixtures compacted at Modified Proctor Optimum (OPM).…”