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Characterization of Reclaimed Asphalt Pavement (RAP) for Use in Bituminous Road Construction - ScienceDirect
Procedia - Social and Behavioral Sciences
Volume 104, 2 December 2013, Pages 1149-1157
Characterization of Reclaimed Asphalt Pavement (RAP) for Use
in Bituminous Road Construction ☆
T.Anil Pradyumna a
, Abhishek Mittal a, b, P.K. Jain Dr a, c
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https://doi.org/10.1016/j.sbspro.2013.11.211
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Abstract
A good road network is a critical infrastructure requirement for rapid economic growth. It
provides connectivity to remote areas; provides accessibility to markets, schools, and hospitals;
and opens up backward regions to trade and investment. Roads play an important role in intermodal transport development, through links with airports, railway stations, and ports. Road
network in India aggregates to about 4.2 million kilometers. This extensive road network, the
second largest in the world only after US, caters to about 65 per cent of the freight traffic and 87PDF
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per cent of the passenger traffic. National Highways (NH) constitute about 70,934 kilometers
which is only 2 percent of the total network. However, it caters to nearly 40% of the total road
traffic. State Highways (SH) and Major District Roads (MDR) together constitute the secondary
system of road transportation which contributes significantly to the development of the rural
economy and industrial growth of the country. The conventional method of providing
bituminous surfacing on flexible pavements require significant amount of energy for production
of bituminous binder from crude petroleum, drying aggregates and subsequently production of
bituminous mix at hot mix plant (HMP).Hot mix recycling is the process in which reclaimed
asphalt pavement materials are combined with new materials, sometimes along with a recycling
agent, to produce hot mix asphalt mixtures. When properly designed, recycled mixtures can have
better or similar performance to those of new conventional hot mix asphalt mixtures.
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Characterization of Reclaimed Asphalt Pavement (RAP) for Use in Bituminous Road Construction - ScienceDirect
Recycling or Rejuvenating agents have been defined as organic materials with chemical and
physical characteristics selected to restore properties of aged asphalt to desired specifications. In
selecting the recycling agent, the viscosity characteristics of the combined aged asphalt binder
and the recycling agent are the determining factors. These agents are also known as softening
agents, reclaiming agents, modifiers, fluxing oils, extender oils, and aromatic oils. The choice of
Recycling Agent (RA) grade will depend on the amount and hardness of the asphalt in the aged
pavement. In general, the lower viscosity RA types can be used to restore aged asphalts of high
viscosity and vice versa. Laboratory studies have been carried out on asphalt mixes with RAP
material and rejuvenating agent and their performance has been compared with virgin asphalt
mixes. Various performance tests such as Retained Stability, Indirect Tensile Strength (ITS),
Creep test, beam fatigue test, resilient modulus and wheel tracking test has been carried out to
compare the performance properties. This paper presents the results of all such performance
tests carried out on asphalt mixes with RAP and virgin mixes. The laboratory results indicate that
the asphalt mixes with RAP and rejuvenating agent provide better performance compared to
virgin mixes. The paper also recommends that the Accelerated Pavement Testing Facility (APTF)
should be put to use to evaluate the actual field performance of recycled pavements in a faster
and effective manner.
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Keywords
Bituminous concrete ;Rejuvenating Agent ;Reclaimed Asphalt Pavement ;Modulus
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