Effects of partial replacement of natural aggregate by recycled aggregate from asphalt pavement on properties of concrete
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Date
2018-07
Authors
Farid Aizuddin Shubandrio
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Abstract
Recycled asphalt pavement (RAP) can be referred as waste materials that is reclaimed
and reprocessed to acquire the asphalt and aggregate. Most of the application of RAP is
to be recycled back into pavement and thus, the suitability of the recycled aggregate from
asphalt pavement to be used in other possible applications such as Portland cement
concrete is not yet being determined. In this study, the effects of partial replacement of
coarse aggregate by recycled aggregate from asphalt pavement on properties of concrete
has been investigated. The recycled aggregate used was originated from asphalt
pavement or recycled asphalt pavement (RAP) aggregate. RAP coarse aggregate was
being obtained from JKR Penang and later been crushed into rubbles. The aggregate
rubbles sieved and graded to sizes similar as natural crushed granite aggregate. Six
concrete mixes with different percentage replacement were made from RAP coarse
aggregate. Several tests were conducted including the assessment of physical and
mechanical properties of RAP aggregate, as well as physical and mechanical properties
of concrete containing RAP aggregate. The results are compared with natural crushed
granite aggregate and concrete containing 100% natural crushed granite aggregate as the
control mix. For the characterization of the RAP aggregate, the bituminous contaminant
found on the surface of the aggregate has greatly influence its physical performance while
its mechanical properties are affected by axle loads subjected during its service period as
asphalt pavement. For the effects of RAP aggregate on properties of concrete, in terms
of physical and mechanical properties, concrete mix with 30% RAP aggregate
replacement has been identified as the best mix proportion in all aspects studied.