Proposed grades of modified bitumen

Undoubtedly, the engineer has the freedom to choose/specify any combination of properties for the modified bitumen that will be used. This introduces a problem to the producers since they have to use different recopies and provide different storage facilities per grade requested. After many years of experience in pavement construction projects, the author proposes three representative grades of polymer-modified bitumens (elastomer modified) 

Sources Reproduced from CEN EN 14023, bitumen and bituminous binders - Framework specification for polymer modified bitumens, Brussels CEN, 2010 and from CEN EN 13808, Bitumen and bituminous binders - Framework for specifying cationic bituminous emulsions, Brussels CEN, 2013. With permission ( CEN). 

The main test is the RTFOT at 163 C. For some highly viscous polymer-modified bitumens where the viscosity is too high to provide a moving film, it is not possible to carry out the RJFOT at the reference temperature of 163°C. In such cases, the procedure shall be carried out at 180°C in accordance with CEN EN 12607-1. 

to be reported may be used when there are no reguiations or other regional requirements for the property in the territory of intended use, but the property has been found usefui to describe poiymer-modified bitumens. 

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Table 3.21 Proposed grades of modified bitumens for locations with AAAT >I2°C ...

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