01661250

Component

An experimental study has been carried out to explore the potential of bauxite residue commonly known as red mud, as mineral filler in asphalt mixes. For comparison, control mixes prepared with stone dust were taken for consideration. This study is first of its kind which aims to utilize red mud of Indian origin as filler in asphalt concrete mixes and compare its performance with conventional stone dust filler. Firstly, both materials were characterized through specific gravity, plasticity index, Methylene Blue Value (MBV), particle size distribution, German filler values, Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Energy Dispersive X-Ray (EDX), hydrophilic coefficient and pH value tests. Secondly, asphalt concrete mixes containing both fillers were designed and Optimum Asphalt Contents (OAC) were determined as per relevant standards. At OAC, mechanical properties of both mixes were assessed by conducting Marshall Stability, Marshall Quotient and Indirect Tensile Strength tests. Moisture susceptibility, active adhesion, passive adhesion and resistance long term aging were inspected by determining Retained Marshall Stability (RMS), mixing time analysis, boiling water test and Mean Marshall Stability Ratio (MMSR), respectively. Red mud modified mixes not only fulfill the requirements specified in Indian paving specifications; but also, they displayed superior Marshall stability and resistances against rutting, cracking and long term aging as compared to conventional stone dust mix. Despite of plastic nature of red mud, asphalt concrete mixes prepared from it not only displayed good active and passive adhesion, but they also fulfilled the desired requirements of resistance against moisture permeation by a higher margin.

This paper was sponsored by TRB committee AFK30 Standing Committee on Non-Binder Components of Asphalt Mixtures.

18-02316

English

14p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; References; Tables

Asphalt concrete; Fillers (Materials); Mechanical properties; Mud; Salvage; Sustainable development; Waste products (Materials)

Environment; Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2018 Paper #18-02316

TRIS, TRB, ATRI

Jan 8 2018 10:34AM