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Impact of Compaction Mode on Strength Properties of Sustainable Asphalt Concrete

Authors

  • saad Issa sarsam Email Sarsam and Associates Consult Bureau SACB, Baghdad, Iraq

DOI:

https://doi.org/10.30564/jaeser.v4i4.3598
Received: 19 August 2021 | Published Online: 4 November 2021

Abstract

Various modes of compacting the asphalt concrete mixture can create
mechanically different behaviour of the prepared specimens and can alter
its sustainability. An attempt has been made in the present assessment to
prepare asphalt concrete specimens by implementation of three modes
of compaction, the gyratory, the roller, and the Marshall hammer. The
specimens were prepared at the target bulk density of Marshall method
at optimum asphalt content. Extra specimens were prepared at 0.5 %
asphalt below and above the optimum. Core specimens have been obtained
from the roller compacted slab samples. The specimens were tested for
the Marshall stiffness, tensile, and shear strength. It was observed that at
optimum asphalt content, the indirect tensile strength declines by (18.8
and 70.5) % for gyratory and roller compacted specimens respectively as
compared with hammer compacted specimens. At optimum asphalt content,
the shear strength declines by (70.5 and 82.2) % while Marshall stiffness
declines by (10.2 and 44.8) % for hammer and roller compacted specimens
as compared with that of gyratory compacted specimen. Specimens
prepared by gyratory compaction are less susceptible to the change in
the testing temperature as compared with other modes of compaction. It
is recommended to consider the mode of compaction to suit the required
design property of sustainable asphalt concrete mixture.

Keywords:

Sustainable Asphalt concrete, Compaction mode, Tensile, Shear strength, Marshall Stiffness

References

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2021 Vol.4 No.4

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