Abstract
Saudi Arabia is the largest Arab country and is one of the most prolific producers of oil and energy consumption. The Kingdom uses heavy oil and diesel to generate electricity and desalinate seawater. This produces large amounts of ash, a toxic substance that is disposed of by landfill and may cause many environmental problems and contribute to pollution of groundwater, which is one of the most important sources of drinking water. This paper presents the possibility of using fly ash by-product waste from electric power generation plants to improve the properties of asphalt mixtures. This study investigates the use of two types of fly ash namely; class C and class F was used as a filler in two types of bitumen and asphalt material known as AC 40/50 and AC 60/70. The rheological performance of asphalt with different percentages of fly ash filler ranging from 0% to 10% with an increment of 2% was tested. The rheological properties of both asphalts modified using both types of ash were determined. The rutting factors of the modified asphalt with fly ash content were calculated using the rheological properties. The result indicates that rutting resistance of asphalt could be improved by both types of fly ash which can be lead to reduces the costs of repairing and rehabilitation of asphalt pavement and reduce environmental impacts of a significant amount of toxic waste fly ash. Class F fly ash shows higher rutting factor than class C. Also AC 60/70 asphalt possess higher rutting factor than AC 40/50 asphalt at both low and high temperature.
Highlights
Kingdom of Saudi Arabia (KSA) is one of the largest Arab countries in West Asia with an area of 2149690 km2 and a population of 32.552336 million in 2017[1]
This paper presents the investigation of the use of two types of fly ash supplied by electricity power plants in KSA to enhance the rutting resistance of asphalt material
The results indicate that fly ash used in this study could be classified as class F fly ash and class C fly ash according to the ASTM 618 standards requirements
Summary
Kingdom of Saudi Arabia (KSA) is one of the largest Arab countries in West Asia with an area of 2149690 km and a population of 32.552336 million in 2017[1]. The larger the population of a country and the higher the income, the higher the demand for electricity, energy, and transport infrastructure such as roads and highway which consumes an enormous amount of energy and asphalt materials[4]. KSA has more than 70 power plants which consumed more than 22 million metric tons of crude and heavy oil These power plant produced a vast amount of fly ash waste. The total amount of fly ash waste in 2008 was about 0.25 million cubic meters, and it is expected to increase to half million cubic meters by 2016 [8] This significant amount of waste ash mostly disposed of in landfill which contribute to several environmental problems. This paper presents the investigation of the use of two types of fly ash supplied by electricity power plants in KSA to enhance the rutting resistance of asphalt material. The rheological performance and rutting factors of these types of bitumen incorporated different percentage of fly ash content were evaluated and reported
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