Description
Advanced Characterization of Industrial-wastes Modified Asphalt-Rubber Mixtures: A Focus on Encapsulating the Activated Rubber-Asphalt Conglomerates
Harmandeep Kaur
Doctoral Research Scholar, Department of Civil & Environmental Engineering, Indian Institute of Technology Tirupati, Andhra Pradesh 517619, India; Email: ce22d502@iittp.ac.in
Krishna Prapoorna Biligiri
Corresponding Author, Professor, Department of Civil & Environmental Engineering, Indian Institute of Technology Tirupati, Andhra Pradesh 517619, India, Tel: +91-877-2503157; Email: bkp@iittp.ac.in
ABSTRACT. Several studies have incorporated industrial waste materials into Asphalt-Rubber (AR) applications, including pond ash, fly ash, ground granulated blast furnace slag (GGBFS), and silica fumes that have demonstrated significant potential as surface activators and agents for encapsulating rubber-asphalt conglomerates. Further, a recent study successfully engineered a set of new generation Encapsulated Sustainable Industrial wastes Modified Asphalt-Rubber (ESIMAR) formulations in-house and characterized for their thermochemical properties. However, in order to understand the full potential of the ESIMAR products, it was imperative that the encapsulated rubber-asphalt conglomerates be utilized in devising ESIMAR-based mixtures and test for their performance characteristics so they could be applied as green roadway materials and be part of pavement circularity goals. Thus, the major objective of this study was to develop and characterize a set of composite ESIMAR-based mixtures incorporated with industrial waste materials such as fly ash, pond ash, and GGBFS through the dry process and employ advanced mixture characterization techniques to evaluate the properties of these enhanced AR mixtures. The experimental program encompassed |E*| dynamic modulus, flow number, moisture susceptibility, and indirect tensile fatigue tests. The results indicated that ESIMAR mixtures illustrated increased strength at higher temperatures indicative of rutting resistance, higher fatigue life by more than two-three times, and increased durability than the conventional dense-graded mix. It is envisioned that the utilization of industrial waste materials in encapsulating the activated rubber-asphalt conglomerates represents a significant step toward sustainable roadway infrastructure, aligning with circular economy principles by promoting resource conservation and reducing environmental impacts.
KEYWORDS: Modified Asphalt-Rubber (MAR), Industrial Wastes, Fly Ash, Pond Ash, Ground Granulated Blast Furnace Slag, Encapsulation, Circular Economy.
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