Design and performance of open graded friction course mixes with electric arc furnace steel slag

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India has the second largest road network in the world with over 5.6 million km of roadways spread across the country, Currently, 98% of the Indian roads are flexible pavements, constructed using dense graded bituminous mixes as wearing course. The dense graded bituminous mixes are to be impermeable to water with an air void content in the range of 3- 5% by mix volume and are designed using well-graded aggregates and bituminous binders, During rain due to surface water flow dense graded mixes raises concerns related to hydroplaning, skidding, and splash and spray. Dense graded bituminous surfaces during rain also have reduced visibility and increased glare due to presence of surface water film, which has a significant effect on the road safety aspects. It has been estimated that 20% of road accidents occur during wet weather conditions and mainly attributed to lack of skid resistance, visibility, splash and spray, etc. Hence, in high rainfall and hilly regions it will be quite helpful to have wearing courses that have high permeability and can quickly drain out the surface water, without compromising the performance aspects, Open graded friction course (OGFC) is a special type of hot mix asphalt (HMA) mix that acts as a drainage layer to permit the surface water to migrate laterally to the edges of the pavement, OGFC has benefits in terms of improved skid resistance, higher visibility, reduced hydroplaning, reduced glare, lower tyre-pavement interaction noise and enhanced safety.
Supervisors: Rajan Choudhary and Bimlesh Kumar