INDIAN INSTITUTE OF TECHNOLOGY ROORKEE International Conference Transportation Infrastructure Projects Conception To Execution January 7-10, 2019 Authors Ankit Sharma*, G.D. Ransinchung R.N.**, Praveen Kumar*** *Research Scholar, IIT Roorkee, India **Associate Professor, IIT Roorkee, India *** Director, NIT Delhi, India Adaptation and Performance of Hot Mix Asphalt Recycling Technology in India and Abroad : A Review
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INDIAN INSTITUTE OF TECHNOLOGY ROORKEE
International Conference Transportation Infrastructure Projects Conception To Execution
Binder Selection Guidelines for RAP Mixtures According to AASHTO M 323
Sr. No. Amount of RAP Recommendation
1 <15% No change in binder selection.
2 15% to 25% Select virgin binder one grade softer than normal
(e.g., select a PG 58-28 if PG 64-22 would
normally be used)
3 >25% Refer blending chart provided in ASTM D4887,
2016.
Adaptation of HMA Recycling in India
• In India the first reclaimed asphalt pavement was constructed in 1948 which serves uninterrupted for 30 years.
• Recycling of Asphalt Pavement is the leading research in India right now in pavement sector.
• IRC : 37- 2012 guidelines on Cold Recycling of RAP material are based on South African Bitumen and Tar association (SABITA) and Asphalt Mix Manual (MS-14) by Asphalt Institute, USA.
• There is a need to formulate Mix Design Guidelines for Hot Mix Asphalt (HMA) and Cold Mix Asphalt (CMA) of RAP material for Indigenous conditions.
Selection of virgin grade of bitumen for recycling purpose (India)
Sr. No. Amount of RAP Recommendation
1 <20% Same as specified in IRC 111, 2009.
2 21% to 30% One grade softer than as specified in IRC 111,
2009.
3 >30% Refer blending chart provided in ASTM D4887,
2016.
Source : Draft prepared for Indian Roads Congress, 26 February 2013. “Tentative Guidelines for Hot Recycled Plant-mixed Dense Graded Bituminous Mixes”
Indian Technical Circulars
• Two technical circulars :1. 48/2010 "Use of Reclaimed existing bituminous
material to upgrade an existing bituminous pavement in NHAI project" dated 24-02-2010 (NHAI, 2010) and,
• These have been issued to contractors by National Highway Authority of India (NHAI) for using RAP material in Surface or base/ binder course of main road or service road. Comptroller and Auditor General (C&AG) of NHAI demands consolidated details of RAP material at NHAI in a table given below:
Indian Technical Circulars
• Two technical circulars :1. 48/2010 "Use of Reclaimed existing bituminous
material to upgrade an existing bituminous pavement in NHAI project" dated 24-02-2010 (NHAI, 2010) and,
• These have been issued to contractors by National Highway Authority of India (NHAI) for using RAP material in Surface or base/ binder course of main road or service road. Comptroller and Auditor General (C&AG) of NHAI demands consolidated details of RAP material at NHAI in a table given below:
Name of
State
Name of
PIU
Name of
Stretch
Length
(km)
Status of
use of
RAP (if
used)
Reason
for not
using RAP
Conclusions
• Cracking resistance lowers by increasing RAPcontent, but not universally true.
• Softer Grade Bitumen or Rejuvenators,improved Cracking Resistance.
• Moisture Susceptibility is not generallyaffected by RAP content.
• Lower levels of binder replacement, bindergrading remain same as of virgin binder.
Conclusions
• Higher levels of binder replacement,combined binder grading increases both thehigh and low temperature grades.
• Stiffness of mixture increased with binderreplacement.
• Rutting Resistance improved at all binderreplacement levels.
References
• An Overview of Recycling and Reclamation Methods for Asphalt Pavement Rehablitation. (1992). Annapolis, MD.
• Kandhal, P. S. (2016). BITUMINOUS ROAD CONSTRUCTION IN INDIA (2016th ed.). PHI Learning. Retrieved from https://www.phindia.com/Books/BookDetail/OTc4LTgxLTIwMy01MjU4LTI
• David E. Newcomb, J. A. E. F. Z. (2016). Use of RAP & RAS in High Binder Replacement Asphalt Mixtures : A Synthesis. Retrieved from http://driveasphalt.org/assets/content/resources/SR213_-_RAP-RAS_Synthesis-lr.pdf
• Wright, F. G. (2015). Administrator’s Message “FHWA Recycled Materials Policy”. Retrieved December 15, 2018, from https://www.fhwa.dot.gov/legsregs/directives/policy/recmatpolicy.htm
• Willis, J. R., & Marasteanu, M. (2013). Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content. WASHINGTON, D.C. https://doi.org/10.17226/22554
• E-C 188, T. R. C. (2014). Application of Reclaimed Asphalt Pavement and Recycled Asphalt Shingles in Hot-Mix Asphalt: National and International Perspectives on Current Practices. In Transportation Research Circular E-C188 (p. 78). Transportation Research Board. Retrieved from http://onlinepubs.trb.org/onlinepubs/circulars/ec188.pdf