The increased use of alternative materials, particularly streams of industrial by-products in transportation construction is motivated by the need to optimize construction of sustainable pavements. Fly ash has mostly been used as an additive in various applications in transportation construction. This paper presents a study on the use of a fly ash product as the primary constituent, rather than an additive. A fly ash product was lightly treated with cement in one test series, with lime and an enzyme based liquid stabilizer in the second and third test series respectively producing lightly stabilised fly ash (LSFA) material. Testing was aimed at fit-for-purpose assessment of the LSFA material in terms of mechanical properties. This is work in progress. The results have shown that the LSFA can achieve shear strength and modulus values highly appropriate and fit for design application in low volume roads.
Paper presented at the 34th Annual Southern African Transport Conference 6-9 July 2015 "Working Together to Deliver - Sakha Sonke", CSIR International Convention Centre, Pretoria, South Africa.