Abstract:
Coconut char derive from coconut shell is a waste product that is anticipated
to be potential alternative for modified binder. Coconut char has great potential
to be used as the base material for modifier because it is safe to use. In this study the
coconut char was used as additive in asphalt modified binders. This paper presents
the rheological properties ofmodified bitumen incorporating coconut char. Rheology
can be defined as the fundamental measurements associated with the flow and deformation
characteristics of bitumen, evaluation of the flow and permanent deformation
of time-temperature dependent materials, such as bitumen, that are stressed through
the application of force. The modified bitumen was tested under different aging
conditions using Rotational Viscometer (RV), Rolling Thin Film Oven (RTFO) and
Dynamic Shear Rheometer (DSR). Coconut char was blended with 5, 10, 15, 20
and 25% by weight of the penetration grade 80/100. DSR was employed to measure
the rutting resistance, the G*/sin at temperature 46–76 °C. Based on the findings, it
is shown that the increase in coconut char percentage can effectively give highest
G*/sin and affect the rutting performance under ageing condition. It also found that
modified bitumen samples enhanced the rheological properties of the bitumen in
terms of fatigue cracking and rutting.
