The Effect of Using Various Types of Mineral Fillers on Moisture Damage of Hot Mix Asphalt

Abstract

Abstract In general, asphalt additives are designed to improve the performance of asphalt mixtures by increasing their durability and resistance to cracking, and other forms of damage. Asphalt additives can be made from natural or synthetic materials, and some are biodegradable. Natural asphalt additives such as steel slag powder and silica fume are generally more sustainable than synthetic ones. The use of sustainable asphalt additives can help reduce the environmental impact of asphalt mixtures while improving their performance. This study aims to evaluate the effects of various fillers on the performance of the asphalt mixture and its tolerance to moisture damage, including steel slag powder, silica fume, and ordinary Portland cement. The research involves establishing a standard reference mix for comparison as well as several asphalt mixtures with varying amounts of mineral fillers (0, 25, 50, and 75% SSP and 3, 6, and 9% SF & OPC). The Marshall stability tests and the indirect tensile strength test were among the tests used to evaluate the mechanical properties, and the results showed that the optimal value for using steel slag powder is (25%) and for silica fume is (9%).