asphalt rubber RARx

RARx additive with rubber powder

60% ELT powder in its composition

(ELT: End of Life Tires)

What is RARx?

RARx is a high-tech product made from end of life tyre powder (60% of its composition) pretreated with bitumen and other additives of mineral origin. 

RARx marks an evolution of currently existing technologies, incorporating powdered rubber from end of life tyres into asphalt mixtures.

  • The final quality of the product and the digestion of the rubber powder particles are ensured when carrying out this process at the place of origin (wet process).
  • It takes advantage of its versatility and ease of use in asphalt-mixing plants since it is incorporated into the production process of the mixes in question as an additive or an additional fine aggregate (dry process).

How do you work with RARx?

The main advantage of RARx is its ease of use in asphalt-mixing plants

  • The RARx is sent to the plant in big-bags or tankers.
  • It is stored in one of the filler silos.
  • It is dosed with the aggregates for an even distribution with them before its incorporation into the end product.

In this way, the RARx allows the manufacture of asphalt mixtures of high performances for small works or actions, without energetic extra charges for the plant of manufacture of mixtures and with the versatility of being able to execute works of great or small volume, constant or discontinuous in the time.

What are the advantages of working with RARx, additive with rubber powder?

The asphalt mixes produced with RARx have numerous advantages in different aspects, which can be summed up as follows:

Technical advantages of RARx, additive with rubber powder

  • Enables the performance of modified mixtures to be achieved
  • Prevents the spread of cracks
  • Exponential increase of life to fatigue
  • Absence of plastic deformations

Financial advantages of RARx, additive with rubber powder

  • Improves the cost compared to mixtures with modified bitumens
  • Avoids any problems on work site and allows high performance execution
  • Avoid problems with rubber bitumen, such as decantations and tank problems

Environmental and social advantages of RARx, additive with rubber powder

  • Substantial improvement of the LCA of the executed works, thus protecting the environment (LCA: Life Cycle Analysis)
  • It allows the optimization of the pavements and, therefore, a lower use of natural resources.
  • Allows the reuse of used tires.
  • Allows the manufacture of low-noise asphalt mixes

Study: Mix Design ThinGap with RARx

The present study objective was to design one asphalt rubberized mixture ThinGap with a bitumen stabilizer RAR (Reacted and Activated Rubber, type RARX).

Study realised for Road Commission of Kalamazoo County (RCKC) by Consulpav

Study of RARx

RARx: First demostration project in USA

A Michigan Technological University (MTU) research project in collaboration with The Road Commission of Kalamazoo County (RCKC) 


RARx: Winner of the IRF Global Road AchievementAwards (GRAA) “Research” category

The GRAA “Research” category recognizes specific research initiatives that significantly advance the highway development industry.


NT 02/2020 – Technical Note from the Ministry of Transport, Mobility and Urban Agenda of Spain (MITMA)

The MITMA, through TECHNICAL NOTE 02/2020, standardizes the use of rubber additives (RARx) for any road to replace modified bitumens.

NT 02/2020 MITMA

European Technical Assessment (ETA) of RARx

ETA Certificate accredits RARx as an industrial product that meets European quality and safety standards.


Self-Declared Environmental Claim (SDEC) of RARx

The SDEC of RARx is the first SDEC of a bituminous product to be put on the market, and like RARx itself, it will be a step forward that will allow us to change the way we understand road projects.


Testing of two sections of bituminous mixtures made with crumb rubber on the accelerated test track of CET pavements

Accelerated aging tests have been completed on the CEDEX test track, of an AC22 SURF mix made with RARX versus an AC22 SURF mix made by Dry Process with a BC 50/70. The result has demonstrated the validity of the RARx and the behavior of the mixture made, which has in some respects surpassed the mixture made by Dry Process.


Comparative Life Cycle Analysis Study of the rehabilitation of concrete pavements between conventional asphalt mixes and asphalt mix with RARx additive

>> Highway Project Pirámides to Tulancingo (Mexico)

Through the European project “Silent Rubber Pave”, 2020 Horizon, an ACCV Comparative Study has been carried out in the construction of the highway from Pirámides to Tulancingo, which has shown that the use of the Rarx can reduce the environmental footprint caused by the work by 44%.


Further information about RARx:

RARx Technical Advantages (Spanish)
RARx CE Marking Certificate
RARx Informative Flyer
Dittico informativo RARx italiano
Executed Works using RARx
RARx Safety Data Sheet
RARx Technical Data Sheet
Properties of asphalt mixes with RARx

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