UTILIZATION OF TORAY FLY ASH AS FILLER SUBSTITUTION IN THE HOT ROLLED SHEET-WEARING COURSE (HRS-WC) MIXTURE
Abstract: In road construction
materials, the utilization of fly ash as additive materials is limited and also
small in quantity, while the disposal of fly ash is quite high. An abundance of
fly ash can be found at PT Toray Company in Jakarta and Surabaya. Toray fly ash
is disposed coal ash resulting from coal-fired electricity generating power
plants. Toray fly ash in this research is used as substitute mineral filler in
asphalt paving mixtures. Research on utilization of Toray fly ash as filler is
conducted in the Hot Rolled Sheet – Wearing Course Mixture. Filler content in the HRS –WC mixture is 9%.
Variations of Toray fly ash in the mixture tested are 0%, 25%, 50%, 75%, 100%
and the variations of asphalt content are 6%, 6.5%, 7%, 7.5%, 8%. Marshall test
is performed to determine the Optimum Asphalt
Content and Marshall Stability, Indirect
Tensile Strength (ITS) test and Tensile Strength Ratio (TSR) to select the
optimum Toray fly ash utilization in the mixture based on the moisture
susceptibility of specimens. The research results show that in variations of
0%, 25%, 50%, 75% and 100% Toray fly ash in the HRS-WC Mixture, the Optimum
Asphalt Contents are at 6.8%, 7.0%, 7.0%, 7.1% and 7.6% and Marshall Stability values of the
variations are 1649 kg, 1541 kg, 1568 kg, 1678 kg, 1718 kg respectively. TSR
values in variations of Toray fly ash are 98.32%, 90.28%, 89.38%, 87.62%,
64.71% respectively, with Minimum TSR value required is 80%. Based on the
overall parameters, the optimum Toray fly ash utilization in the HRS-WC Mixture
recommended is 75% of Toray fly ash at 7.1% Optimum Asphalt Content.
Author: F. Candra, L. B.
Suparma
Journal Code: jptsipilgg110031
