EFFECT OF PULVERIZED FLY ASH ON COMPACTION EFFORT FOR ASPHALT CONCRETE

Major concern of today's world is on environmentally treatment of wastes.
Wastes such as pulverized fly ash (PF A), blast furnace slag, kiln dust, steel slag ash, and
etc are increasing rapidly due to the growing production volume in the industry. These
waste materials have been recycled and used in construction industry for decades of
years. In Malaysia, according to the 8th Malaysia Plan, it is estimated that Malaysia will
use up 11.2 million tonnes of coal per annum. This will generate more than 2 million
tonnes ofPFA annually. Even though there is abundant ofPFA in Malaysia, only a small
percentage of the PF A is utilized for construction purposes. Main development in this
country is focused on the construction of road which cousumes a huge amount of
materials both raw and processed so if waste products can be used as a substitute to the
constituent of asphalt mix design, a more economical asphalt mix can be produce while at
the same time solving the problems of disposing waste products. In this study, pnlverized
fly ash will be replacing the normal filler of quarry dust or Ordinary Portland Cement
(OPC) in the asphalt mix. The objectives of this study are to determine the effect ofPFA
application in asphalt concrete and to obtain· an optimum compaction effort for the mix
design. Two sets of asphalt specimeus with the respective mineral filler of Ordinary
Portland Cement (OPC) and the pnlverized fly ash were prepared with different
compaction effort and tested using Marshall Mix Test. As a conclusion, the results
showed that the substitution of OPC with PF A gives a better performing asphaltic
concrete in stability, flow, Marshall Stiflhess, and air voids at a lower compaction effort.