Abstract
The settlement of high embankments constructed over soft compressible soil deposits is affected by the self-weight of the embankment material. In such situations, lightweight materials are preferred over the conventional earth materials. This paper delineates the geoengineering properties lightweight foamed geopolymer prepared from a mixture of fly ash and ground granulated blast furnace slag with sodium hydroxide as an activator. Aluminum powder, hydrogen peroxide and Triton X 100 are used as foaming agents. UCS tests are conducted to evaluate the mechanical properties after curing periods of 7 and 28 days. XRD and SEM tests are performed to inspect geopolymerization reactions, composition and microstructure of the products. Lowest density of 0.96 g/cc is obtained by using 0.5% H2O2 as foaming agent with unconfined compressive strength of 1.33 MPa indicating that this can be used in sub-base and subgrade of highway embankments, constructed over soft soil deposits.
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