Abstract:
The use of natural aggregates with suitable characteristics for road
construction presents in some regions a real problem of availability or
cost related to transport. However, the resources in place, which are
naturally unusable, can be used after treatment with Hydraulic Road
Binders (HRB). In this study, we propose to valorize the mineral Coal
Bottom Ash (CBA), a residue from the combustion of the SONICHAR
power station in Niger, as the main component of an HRB.After a
physical, chemical and mineralogical characterizationof the coal
bottom ash, several proportions of the CBA powder and a cement type
CEM I 42.5 were studied. Compression tests were carried out at 07, 28,
56 and 90 days to determine the class of the binder corresponding to the
mixture selected.The performance of the HRB thus obtained was
evaluated on two types of weakly clay soils (IP <= 12, NF P 94-051),
having an initially insufficient CBR. The 3% treatment of this product
made the two aforementioned soils suitable for use as a base layer.
