Additive composition for bituminous conglomerates with high mechanical performances

Abstract

Additive composition intended to be mixed into bituminous conglomerates for road paving, comprising a thermoplastic polymer, a polymeric compound selected from the group consisting of polyvinylbutyral (PVB), polyethylacrylate (PEA) polymethylacrylate (PMA), polybutylacrilate (PBA), lignin and mixtures thereof, and graphene, preferably wherein the graphene is contained in quantity between 0.005 and 1% by weight based on the total weight of the composition; it is also described a bituminous conglomerate suitable for making a road paving, comprising aggregates, a filler, bitumen and the additive.

1 . An additive composition intended to be mixed into a bituminous conglomerate for road paving and suitable for improving the mechanical properties of bituminous conglomerate, comprising a thermoplastic polymer, lignin, and graphene, wherein the thermoplastic polymer is a polyolefin or a mixture of polyolefins. 
     
     
         2 . The additive composition according to  claim 1 , wherein the thermoplastic polymer is a recycled material. 
     
     
         3 . The additive composition according to  claim 1 , wherein lignin is recycled lignin. 
     
     
         4 . The additive composition according to  claim 1 , wherein the graphene is recycled graphene. 
     
     
         5 . The additive composition according to  claim 1 , wherein the graphene is contained in the additive composition in a quantity of between 0.005 and 1%, by weight based on the total weight of the composition. 
     
     
         6 . The additive composition according to  claim 5 , wherein the graphene is contained in the additive composition in a quantity of between 0.005 and 0.15% by weight based on the total weight of the composition. 
     
     
         7 . The additive composition according to  claim 6 , wherein the graphene is contained in the additive composition in a quantity of between 0.01 and 0.1% by weight based on the total weight of the composition. 
     
     
         8 . The additive composition according to  claim 1 , wherein lignin is contained in the additive composition in a quantity of between 5 and 55% by weight based on the total weight of the composition. 
     
     
         9 . The additive composition according to  claim 8 , wherein lignin is contained in the additive composition in a quantity of between 10 and 50% by weight based on the total weight of the composition. 
     
     
         10 . The additive composition according to  claim 1 , wherein the thermoplastic polymer is selected from the group consisting of polyethylene, polypropylene, and mixtures thereof. 
     
     
         11 . The additive composition according to  claim 1 , wherein the thermoplastic polymer is contained in the additive composition in a quantity of between 45 and 95% by weight based on the total weight of the composition. 
     
     
         12 . The additive composition according to  claim 11 , wherein the thermoplastic polymer is a mixture of polyethylene and polypropylene comprising a quantity of polyethylene of between 25 and 75% by weight based on the total weight of the mixture. 
     
     
         13 . The additive composition according to  claim 11 , wherein the thermoplastic polymer is contained in the additive composition in a quantity of between 50 and 90% by weight based on the total weight of the composition. 
     
     
         14 . The additive composition according to  claim 1 , being in granular form or in form of chips, or in powder form. 
     
     
         15 . A bituminous conglomerate suitable for making a road paving with improved mechanical properties, comprising aggregates, filler, bitumen and the additive composition according to  claim 1 , wherein the additive composition is contained in the bituminous conglomerate in a quantity of between 0.09 and 15%, by weight based on the total weight of the bitumen. 
     
     
         16 . A process for producing a bituminous conglomerate suitable for making a road paving with high mechanical performances, comprising the step of adding to said aggregates, under stirring and at a temperature of between 130° C. and 200° C., the additive composition according to  claim 1 , bitumen and a filler.