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Crumb Rubber Modified Binder (CRMB)

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Status: Implemented 


Brief Description: CRMB encompasses using ground tires in the asphalt mixes using one of the following methods: 

  • Dry Method: Dry rubber particles are added to aggregate and bitumen in a pugmill at the asphalt mixing plant. The rubber is usually mixed with the aggregate prior to bitumen addition

  • Wet Method: Crumb rubber and bitumen are reacted together at high temperature to produce a crumb rubber binder. The CRMB is then added to the aggregates in a mixing plant, in the same way as any other binder. (Adopted by Ashghal) 


Brief Description (CRMB Wet Method):

In the wet method CRMB is produced by combining crumb rubber from used car/truck tires and bitumen, through a highly controlled specialized blending process. It should be noted that CRMB has been used to improve rheological properties of conventional binder (60/70 Pen) similar to PMB. It meets all performance requirements of PMB, but has superior environmental benefits (PG76E,V,H -10). It has several benefits when properly produced, stored, handled, and constructed. CRMB producers are qualified as per Ashghal guidelines 2018/0035882/7.

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Major CRMB benefits: 

  • Improve durability and performance including rutting and fatigue.

  • Reduction in Noise (Quieter).

  • More sustainable solution and reduction of landfill and tires debris. 

  • Improve skid resistance. 


 




It should be noted that it is implemented in Wearing Course layers placed since 2020 in most Ashghal RPD projects. 



Link to a published paper related to the topic of the slide:

Nunoo, C. N., & Al-Tamimi, S. A. (2020). Implementation of Crumb Rubber Modified Binder for Qatar Local Roads Construction Projects. Proceedings of the International Conference on Civil Infrastructure and Construction (CIC), 2020(1), 403- 412. https://doi.org/10.29117/cic.2020.0051​


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