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Resilient modulus of double layer porous asphalt: application of alkali treated coconut shell and fiber as aggregate replacement
Tay, Lay Ting1, Ramadhansyah Putra Jaya2, Norhidayah Abdul Hassan3, Haryati Yaacob4.
Coconut shell and coconut fiber are the new waste that have been concerned in the
highway asphalt pavement industry lately. This paper has studied about the effect of coconut
shell and coconut fiber to the resilient modulus of double layer porous asphalt (DLPA). The
coconut shell has been substitute to the double layer porous asphalt by 5%, 10% and 15 % of the
aggregate with 5 mm size by weight while coconut fiber was added to the asphalt incorporating
0.3% and 0.5% by weight. Before mixing with others aggregate, coconut shell and coconut fiber
was treated with 5%wt NaOH to reduce it water absorption ability. The samples were prepared
by using Marshall Method. The result shows that DLPA with 10% has better resilient modulus
under 25ºC temperature for unaged and aged samples. However, the sample with coconut fiber
has lower resilient modulus as the amount of coconut fiber has increased. In general, the
substitution of 10% coconut shell provided better resilient modulus among the percentages that
have been chosen.
Affiliation:
- Universiti Teknologi Malaysia, Malaysia
- Universiti Teknologi Malaysia, Malaysia
- Universiti Teknologi Malaysia, Malaysia
- Universiti Teknologi Malaysia, Malaysia
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