Maximizing Void Properties from Optimized Local Pozzolans in Wearing Course of Bituminous Concrete Mixtures
Abstract
Failure of asphalt pavement has influenced research into better ways to optimize local pozzolans seen
as waste and reduce cost of importation of admixtures. Waste Shell Ashes are checked as local
assembled by incorporating them in asphalt concrete mix design. Different research has shown that
some agricultural waste/by-products can be admitted as mineral fillers in hot-mix asphalt concrete to
obtain certain desirable properties. It is on this basis that this research attempts to interrogate the effect
of Periwinkle Shell Ash (PSA), Snail Shell Ash (SSA); PSA-SSA blends respectively on void properties
of asphalt concrete. An experimental approach was adopted to accomplish this goal using the Marshal
Mix design method to prepare representative samples. Stability and flow were gained using the Marshal
apparatus, while the Asphalt Institute Models was used to obtain some of the focus parameters. The
results show that the voids properties, such as f, air voids (Va) and voids in mineral accumulate (VMA),
captured from the PSA-SSA modified HMA concrete was better than that of the conventional
(unmodified) HMA concrete due to the addition of these pozzolans (Snail and Periwinkle Shell Ashes
as blend- SSA-PSA)). However, PSA-SSA Blends Optimized at 6% content by weight of aggregates and
was the threshold, where it attains maximum values of the void’s properties. However, to gain maximum
value from a PSA-SSA blend, the pozzolans must not exceed 6% by weight of aggregates.
Keywords
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DOI: https://doi.org/10.37628/ijsmfe.v7i2.1316
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