How & why to recycle old asphalt?

posted by Sunil Newatia on April 22nd, 2021
Limited availability of fresh natural aggregate supplies with increasing processing costs have led to use various reclaimed/recycled materials from old roads as a source of road construction material.  Use of recycled materials for building roads, pavements, footpaths is increasing all over the world due to their cost effectiveness and environmentally sustainable aspects. Recycled Asphalt, stabilised with cement binders has been reported to perform satisfactorily in sub-base layers.
Asphalt Recycling Process

Asphalt is reclaimed when an existing hot mixed asphalt (HMA) layer is removed for reconstruction or resurfacing. The two methods generally used for reclamation are (i) cold milling and (ii) ripping & breaking.

Asphalt milling is a recycling and re-paving procedure, aimed at removing the top layer of asphalt from a street, parking lot or driveway without disturbing the sub-base. Once the asphalt is milled up, it is taken to an asphalt plant where it is screened and sized and then used in the construction of new pavement. In most cases, the quality of this "renewed" asphalt is better than pavement made from new aggregates. Asphalt can be recycled and reused many times.
Asphalt Pavement being broken / ripped
What is Asphalt Pulverization?

Asphalt Pulverizing is a process that grinds up the existing full-depth removal of Asphalt using ripping and breaking with  a ripper and/or hydraulic rockbreaker. Pulverised Asphalt is then blended with any sub-layers, essentially creating a new sub base using all the old materials. Proper crushing and screening of Recycled Asphalt can yield well-graded aggregate particles that are partially or wholly coated with asphalt binder. Ripped Asphalt pavements are pulverised in situ and converted into a granular or stabilised sub-base using a self-propelled pulverising attachment. 
Pulverizing is a popular option because:
  • It saves money: Old base layers don’t have to be excavated and new material doesn’t have to be hauled in.
  • It’s fast: The reconstruction process goes quickly when everything is done right in place.
  • It’s environmentally friendly: Since new base materials don’t have to be produced and brought to the site, it’s one of the most environmentally friendly options available.

Asphalt pulverizing is a great way to rip an existing pavement, recycle it, and make it even stronger and longer lasting than the original pavement. Recycling through pulverization reduces your costs, while at the same time, keeps the planet healthy.

Benefits of Recycling Asphalt

Environmental Benefits:
  • Recycling old asphalt reduces the amount of new oil needed in the construction process and may reduce dependence on imported oil.
  • Recycling saves on construction material waste since the recycled material is not sent to a landfill.
  • Recycling the mineral particles that are produced during the process of asphalt pavement helps conserve natural resources.

Economic Benefits:
  • Taxpayers save money with asphalt recycling as cost of building roads reduces considerably
  • Contractors save by reducing energy, materials, and transportation costs.
  • Asphalt can be recycled multiple times, ensuring its value.

Asphalt Benefits:
The quality of asphalt pavement is improved when recycled pavement is used. There is a stronger cracking resistance because of the added mineral fillers and organic fibers are used in the recycled materials. Other benefits include:

  • Reduced demand for new asphalt pavement
  • Reduced demand for aggregates and thus reduction in quarrying
  • Improved Hot Mix Asphalt mixes
  • Improved asphalt stiffness
  • Decreased likelihood for cracking
  • Decreased need for “virgin” asphalt
Simex Asphalt Granulator CBA30

Simex has developed an Asphalt  Granulator that can be pulverise and process the Recycled material and create a new income source for you. Recycled Asphalt can be pulverised down to the right size and reused as base or sub base material on a number of different job sites:
Pulverised and Granulated material

Construction of a new landing strip or a taxiway is expensive and can result in delays if new aggregates are required from quarries. Simex CBA30 Asphalt Granulator can pulverise the existing Asphalt and then it can be applied as a base for the new airstrip.” 

Recycled old asphalt can be used as base material for building roads in Cities, towns and villages

Simex CBA30 can work on any job sites crushing the ripped and broken Asphalt saving the contractor huge costs in transportation and disposal of material. Ripped Asphalt which is usually dumped and used as landfill, can be recycled and create enormous value for both the contractor and local authorities

Reclaimed Asphalt Road is as good as a road built with new aggregates.

Check out the video of CBA30 in action:

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