CEMENT STABILISED LATERITE SUB-BASE MATERIAL

摘要

In Senegal road projects often traverse areas of lateritic soils which must be stabilised before reuse. This paper examines mineralogical properties of three laterites by SEM and XRD analysis. The composition is variable : mineral clays have an effect on behaviour. Analysis shows that the alteration to quartz and feldspar results in minerals which are reactive in the presence of lime. Hydroxides of iron and aluminium will also play an important role in the stabilisation. Development of hydration process of cement laterite mixes is studied and the products identified by SEM and XRD. The presence of CSH(ⅰ) is found principally in stabilised laterites that have a high kaolin content, this is attributed to the presence of amorphous silica formed in the kaolinisation of feldspar.