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Use of Millings in Flexible Pavement Maintenance

Rafiqul A Tarefder1, Mohiuddin Ahmad1, and Mohammad Hossain2
1.Department of Civil Engineering, University of New Mexico, New Mexico, USA
2.Department of Civil Engineering, Bradley University, USA

Abstract— Use of milling materials in pavement maintenance can help to achieve sustainability through conservation of new aggregates. However, specific guidelines are not available to state Department of Transportation (DOTs) for using millings in maintenance projects. Two case studies are presented herein. One is about use of milling in thin overlay and the other is use of milling in fine seal treatment. For overlay maintenance, two millings materials were considered: coarse millings and fine millings. Trials were made in the field to mix 100% coarse millings without any emulsion and with 1% emulsion. It is observed that 100% coarse millings without any emulsion do not show enough cohesion. Rather, 100% millings with 1% emulsion showed better cohesion and integrity. 100% fine millings were tried with 1% and 2% emulsions. It was observed that fine millings with 2% emulsion worked better compared to the with 1% emulsion. It can be concluded that 100% millings can only be used as thin overlay if emulsion is used in the mix. For fine sealing, fine millings were used to repair an aged pavement with minor cracks. The procedure similar to chip seal was followed and same equipment as chip seal were used. It is observed that fine millings show a better bonding with emulsion if used as sand seal.

Index Terms—chip sealing, emulsion, millings, sand sealing

Cite: Rafiqul A Tarefder, Mohiuddin Ahmad, and Mohammad Hossain, "Use of Millings in Flexible Pavement Maintenance," International Journal of Structural and Civil Engineering Research, Vol. 4, No. 2, pp. 206-211, May 2015. doi: 10.18178/ijscer.4.2.206-211