Reduction of pavement thickness using a subgrade layer treated by different techniques

A range of stabilisers for poor quality subgrade soils have been developed to promote road constructions. Many them are becoming more popular depending on their effectiveness. The purpose behind this research is identify the relative efficacy many physical and chemical stabilisation techniques enhancing properties three types local Iraqi soils. comparison samples based CBR tests. AASHTO (1993) flexible pavement design was used compute thickness requirements. soil A, B C a natural values 3.8, 3.9 4, respectively, which Powdered rock (PR), grained recycled concrete (GRC), crumb rubber grains (CR) were employed, while Quicklime (QL) activated fly ash (AFA) both utilised as stabilisers. with 15 % AFA proved be most applicable method reducing requirements by 51 32 %, reasonable financial feasibility both. same proven when stabilising type GRC, reduces pavementthickness 25.7 %.