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This research objective is to propose a co-valorization of powdered tuff, containing a slight amount of clay and dune sand, by mixing the two substances at different rates such as 0%, 5%, 15%, 25% and 35% of sand. The adapted criteria formulas are those recommended by the technical Saharan road. The results of the proposed study showed that "tuff-sand" mixtures are denser with a lower optimum water content modified proctor, the fine rate decreases together with the plasticity index, whereas the bearing index (CBR: California bearing ratio test) increases. The intrinsic characteristics, cohesion and sensitivity of mixtures with respect to compactness are almost identical to those of tuff without addition. The optimal adapted sand incorporation rate is estimated at 25% at 96% of compactness. Under these conditions, the amount of fines decreases from 40% to an acceptable level of 25% and the plasticity index from 16.2 to 12. The compaction water content decreases by 36% and the CBR (bearing index) increases by 30% and the compressive strength and sensitivity, according to compactness, of the elaborated material are almost identical to those of tuff without addition.

Valorization of the Use of Calcareous Tuff and Dune Sand in Saharan Road Design