“PERFORMANCE EVALUATION OF HOT MIX ASPHALT WITH RAP USING REJUVENATOR” 

INTRODCTION Recycled Asphalt Pavement (RAP) is an old asphalt pavement that is milled up from existing roadway.

Insufficient laboratory and field data available, unclarified design methods and non confidance on quality are the reasons for not practising.

RAP can be combined with virgin aggregates, new binder or recycling agents to produce a recycled mix.

RAP can be added to both HMA and WMA.Evaluations have concluded that using RAP shows

the same performance or sometimes more than that of performance of usual virgin pavement.

LITERATURE REVIEWSL NO AUTHOR RAP TESTS OUTCOME

1.Ahmed Mohamady,Hoseny Abdallah ,et al,,

0%,10%,20%, 25%,30%, 40% RAP without RA.

Marshall Stability Test, Indirect Tensile Strength Test.

The optimum asphalt content is decreased as the RAP % incresed.30% RAP mix suitable for pavement construction .

2.

T.Anil Pradyumna,Abhishek Mittal,Dr.P.K.Jain

20% RAP with 10% RA by wt of recovered bitumen.

Marshal Stability Test,ITS,Creep TestFatigue Test,Resilient Modulous

Resistance to moisture damage, permanent deformation & rutting resistance were improved by using RAP mixes and also fatigue life was improved.

3.

Baoshan Huang,Xiang Shu ,et al,,

10%,20%,30 RAP without Rejuvenator.

Binder Rheological Test.

RAP helps to reduce the stress concentrationin HMA mixtures.

4.

Junan Shen, Serji Amirkhanian, Baming Tang.

On Binder, Virgin binder, 0%,2% & 7.4% Rejuvenator content in aged binders.

DSR,BBR

Fatigue & shrinkage parameters improved. Rutting resistance decreased.

5.Valdes, Gonzalo et al,, Introduced 40% to

60% RAPITS Test,Fatigue Test,Stiffness Test

Use of RAP below 50% gives good results.

6. Shan M et al,, 20-50% RAP ITS Test,Rutting Test,Fatigue Test.

30% RAP shows good in ITS Test & 40-50% against Rutting.

7. Prithvi S,Rajib B et al,,

75% RAP ITS Test,Rutting Test

Good rutting resistance and low tensile strength.

OBJECTIVES To compare the different RAP mixes with conventional asphalt mix.

To compare the performance of RAP mix containing rejuvenator with the RAP mix without rejuvenator.

To meet out the standard values after adding rejuvenator and utilization of RAP.

ADVANTAGES OF RECYCLING PAVEMENTSConservation of aggregate & binder.Reduce cost of construction.It has high rutting resistance.It reduces the emissions & fuel usage.Conservation of energy.Preservation of environment.

METHODS OF RECYCLING OF PAVEMENTS

In Place Recycling Central Plant Recycling

MATERIAL COLLECTION 1.RAP

The RAP material is collected from Vijayapur – Hubballi highway (NH 218).

2.AGGREGATES

20mm down 10mm down 6mm downAggregates are collected from Kolar stone crushing plant.

STUDY METODOLOGY

TESTS ON AGGREGATESAggregate Gradation (Sieve Analysis).Aggregate Impact Test.Los Angles Abrasion Test.Aggregate Crushing Test.Shape Test. a)Flakiness Index Test. b)Elongation Index Test.Specific Gravity and Water Absorption Test.

Sieve Analysis Impact Test Specific Gravity

Crushing Test

Elongation Index Test

Flakiness Index Test

Los Angles Abrasion Test

TESTS ON BITUMEN Ductility Test Penetration Test Specific Gravity Test Viscosity Test

Penetration Test Viscosity Test

Ductility TestSpecific Gravity Test

REJUVENATORWHAT IS A REJUVENATOR? Rejuvenator is a chemical which can enhance the

properties of aged bitumen and thereby enables the use of old bituminous mixes by addition into fresh mix.

BENEFITS OF REJUVENATORS:Increase crack resistance in the HMA.Improves workability/compaction of the RAP mix

design.Do not cause continuous age softening of the RAP

asphalt binder which could lead to increased rutting potential.

 HOW DOES A REJUVENATOR WORK?

The goal of any rejuvenator or recycling agent, is to return the hardened bitumen binder close to its original visco-elastic state.

Once the rejuvenator penetrates the surface of the reclaimed bitumen concrete, the viscosity, flexibility and brittleness of the binder can be improved.

Additionally, they can act as surface sealants, which minimize the effects of oxidation, moisture damage thereby extending a pavement’s life.

REFERENCES:Jim Brownridge,“Rejuvenation of recycled asphalt

pavement in rural road programs”,SEAUPG conference 2006-Wilmington, North Carolina.

Ahmed Ebrahim,Abu EI Maaty,“Characterization of recycled asphalt pavement(RAP) for use in flexible pavement” American Journal of Engineering and Applied Science.

Jie Han,Subash C Thakur,Oswald Chong,Robert L Passons ,“Laboratory evaluation of characteristics of recycled asphalt pavement”,KANSAS,USA.

Viranta Sharma,Robin Babit,Ajay K Duggal, “Recycling practices in flexible pavements with the help of RAP & rejuvenators”, International Journal of Engineering Science Invention Research & Development (IJESIRP), Vol 3,Issue 1,July 2016

Junan Shen & Yoshio Ohne, “Determining rejuvenator content for recycling reclaimed asphalt pavement by SHRP binder specifications”,International Journal of Pavement Engineering, 19 April 2002.

“Effect of Rejuvenator on HMA mixtures with high RAP & RAS contents”, National Center for Asphalt Technology(NCAT).

Oke,O.L, Aribisala J.O,Ogundipe, O.M, Akinkurolere O.O, “Recycling of Asphalt Pavement for accelerated & sustainable road development in Nigeria”, International Journal of Scientific & Technology Research, Volume 2,Issue 7,July 2013.

Taher Baghae Moghaddam, Hassan Baaj, “The use of rejuvenating agents in production of recycled hot mix asphalt”, ELSEVIER, Science Direct.

Junan Shen, Serji Amirkhanian, Boming Tang,“Effects of rejuvenators on performance based properties of rejuvenated asphalt binder & mixtures”, ELSEVIER, Science Direct, 27 March 2006.

Soohyok Im, Fujie Zhou, Robert Lec, Tom Scullion,“Impacts of rejuvenators on performance & engineering properties of asphalt mixtures containing recycled materials” ELSEVIER, Science Direct, 6 December 2013.

Martins Zaumanis, Rajib B Mallick, Robert Frank,“Determining optimum rejuvenator dose for asphalt recycling based on superpave performance grade specifications” ELSEVIER, Science Direct, 15 July 2014.

Arvind K. and Animesh Das, “Bituminous pavement recycling”,Department of Civil Engineering, IIT Kanpur.

Ahmed Mohamady et al,, “Effect of using RAP on asphalt mix performance”,IOSR-JCE,Vol 16,Issue 6,Ver.6,Nov-Dec.2014,PP 55-67.

T.Anil Pradyumna et al,, “characterization of RAP for use in bituminous road construction”, ELSEVIER, Science Direct, 2013.