AMSA MacRebur

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In the last decades, the large increase of industrial waste has pushed the sustainability of the planet to its limit. This has in turn increased public demand for more sustainable industrial processes. New resource-management solutions that are both environmentally safer and less resource intensive are needed. AMSA believes improvements may be achieved by recycling and reusing plastic waste.

Traditionally, road and street asphalt paving has been a favorable field for the study and application of waste addition to the different mixes: from the inclusion of recycled aggregate from the demolition of pre-existing asphalt layers, to adding dust from used tires processing, glass, printer toners, mining waste and incinerator ash.

Following this path AMSA, an asphalt production company with more than a century of history, goes a step further by partnering with the British MacRebur, a pioneer in the development of techniques for the reuse of waste plastics. Our target is to incorporate this waste, once processed, as additives to asphalt mixes.


Plastics are synthetic materials derived mainly from refined crude oil. Plastics are (and have been) one of the most widely used products in the world for their resistance to decomposition and UV radiation characteristics. At the same time, they have become a serious environmental problem as plastic waste remains in the environment for hundreds of years.

Until now, due to technical difficulties and the absence of a market for “end-of-life” plastics, the final destination for such products was the landfill or incineration.

AMSA can now provide a definitive reuse solution for these plastics through this value-adding process and achieves the following milestones:

Consumption of certain
plastics destined
for landfills

footprint & greenhouse
gas emissions

Reduction of the use of
limited natural resources
within the construction industry


The plastic additive manufactured and used by AMSA comes from plastic waste from the local waste sorting facilities and would typically end up in a landfill. This plastic additive is the result of an industrial process that MacRebur has protected with industrial property rights. AMSA has acquired exclusive rights for production and distribution of this technology in Spain.
Its fluidity characteristics when melted during the manufacturing process facilitates its integration into all types of bituminous mixes to form a homogeneous final product.

In our facilities, plastic waste is stored, treated and classified into two types: MR6 and MR8, which have different properties and applications depending on the use and traffic of a given road. Furthermore, our production plant has been modernized and adapted to allow for an automatic and controlled dosage of the plastic additive during the standardized production process of the mixtures. In this way, the quality of the final product is guaranteed as is its applicability by standard methods and machinery. All of this, without degradation of the asphalt mixes values not its manipulation.

Product Appearance:

Multi-colored granules.

Appearance on the asphalt

There is no difference in visual appearance from standard asphalt using conventional or modified bitumen.


The plastic additive produced by AMSA is supplied in 1,000 kilo bags, suitable for being introduced into the automatic dosing silo of the asphalt plant.


The plastic additive is incorporated together with the rest of the
components of the mix at the same time the aggregate and bitumen
are added in the mixer, without the need to change existing
production procedures or temperatures. It acts as a
complement to bitumen and can be used in the whole
range of formulas for the manufacture of asphalt mixes,
both conventional and modified (AC, BBTM, MAM, PA, SMA, etc.).


The experience, tests and research carried out by the AMSA-MacRebur alliance show that the addition of MR6 and MR8 plastic products significantly improves the mechanical properties of the manufactured asphalt mixture. In this way, better results are obtained in terms of rigidity, resistance to deformation and fracture and prolonging the useful life of the finished pavement. These mechanical improvements of the final product not only do they provide the already mentioned environmental benefit of the reutilization of plastic waste that had no prior use, but they also help in reducing the emission of greenhouse gases and guarantee a sustainable and non-polluting industrial manufacturing procedure. Tests on the installed new pavements certify that there is no leaching of this component of the mixture.


Environmental control tests carried out by external auditors allow us to state that the use of this plastic additive means a reduction in CO2 emissions with respect to a conventional asphalt mix, which are quantified in:

1. A reduction of 11,32 Kg of CO2 emitted into the atmosphere for each ton of asphalt produced when using the MR6 plastic type.

2. A reduction of 4,65 Kg of CO2 emitted into the atmosphere for each ton of asphalt produced when using the MR8 plastic type.

Finally, it should be noted that the use of the plastic additive does not present any inconvenience for the reuse of these new layers of pavement in the manufacture of future asphalt mixes from the milling of these. In this way, the recovery cycle can continue on multiple occasions.

At AMSA, we care about the heritage we leave to the following generations. As such, we are committed to the manufacture of more sustainable asphalt mixtures that minimize the use of natural resources and give a new life to plastic waste. That’s why the AMSA – MacRebur alliance was born