International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 07 | July 2024
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p-ISSN: 2395-0072
Investigation of Emulsion Based Warm Mixes Asphalt For Sustainable Paving Solutions Fariz Bhai1, Durgesh Kumar Sahu2, Pushpendra Sahu3 M.Tech. Scholar1, Assistant Professor2, Assistant Professor3 Department of Civil Engineering Shri Rawatpura Sarkar University, Raipur Chhattisgarh ------------------------------------------------------------------------***------------------------------------------------------------------------Abstract Due to the increase in energy costs and emission problems associated with hot mix asphalt (HMA), there has been significant interest in developing warm mix asphalt (WMA) technology for pavement construction. This method in bituminous paving technology allows for the production and placement of bituminous mixes at lower temperatures than HMA, utilizing an environmentally friendly production process with organic additives, chemical additives, and waterbased technologies. This study investigates the preparation of warm mixes by pre-coating stone chips with medium setting bitumen emulsion (MS) and then mixing the coated aggregates with VG 30 bitumen at reduced temperatures. The two binders are used in equal proportions to form the binder. Three mixing temperatures were examined: 110°C, 120°C, and 130°C. Marshall samples were prepared using dense bituminous macadam (DBM) and bituminous concrete (BC) grading according to MORTH specifications. The main objectives were to determine the optimal type of filler, emulsion setting time, mix preparation temperature, and bitumenemulsion binder composition. The study found that mixes prepared at 120°C with an 80:20 bitumen-emulsion composition for DBM and a 70:30 composition for BC exhibited the highest Marshall Stability and indirect tensile strength (ITS), while also meeting other Marshall parameters. The optimum binder contents for warm mixes were identified as 5.1% with an 80:20 bitumen-emulsion composition for DBM and 4.9% with a 70:30 bitumen-emulsion composition for BC, both prepared at 120°C. The tensile strength ratio and retained stability parameters were also found to be satisfactory in these warm mixes. The performance of the warm mixes was comparable to that of traditional HMA, demonstrating their potential as sustainable paving solutions. Keywords: Warm Mix Asphalt (WMA), Hot Mix Asphalt (HMA), Medium Setting Emulsion, Marshall Properties, Indirect Tensile Strength, Tensile Strength Ratio, Retained Stability.
1. Introduction 1.1 General Warm Mix Asphalt (WMA) is a fast emerging technology, now accepted worldwide. The idea of use of lower temperatures to produce asphalt mixes is not new.WMA is defined as the asphalt used to manufacture and spread asphalt mixes at lower temperature than conventional Hot Mix Asphalt (HMA) by decreasing the asphalt viscosity.WMA is produced, placed and compacted at temperature10°C to 40°C lower than the conventional Hot Mix Asphalt (D’ Angelo et.al, 2008). It is a technology that allows lowering of the production and paving temperature of Hot Mix Asphalt (HMA) by reducing the viscosity of binder which helps in increasing the workability of mixture without compromising the performance of asphalt. It reduces energy consumption, carbon dioxide emission, oxidative hardening of Asphalt, overhead and total costs of the Asphalt industry by lowering the production temperature thereby creating a better working environment. However, the lower mixing temperatures have raised concerns on the performance of the mixtures. So there is need to thoroughly evaluate and characterize the WMA mixtures to ensure adequate performance. 1.2 Objective and Present Study The main objectives of the present study are:
To develop a procedure for warm mix asphalt using medium setting emulsion (MS).
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