Patent ID: 8382890
Filing Date: 2013-02-26
Classification: C08K,C08L,C09D,E01C

Abstract:
1. An asphalt mixture comprising at least aggregate, at least one bituminous product, and at least one additive B, wherein the additive B contains at least one compound (B1) of formula: where P is the phosphorus atom, c is from 1 to 2, c+d is equal to 3, A represents a bond or a divalent group comprising at least one oxypropylene (OP) unit and/or at least one oxyethylene (OE) unit; and R represents a hydrocarbon-based chain having from 1 to 30 carbon atoms, the chain optionally being linear or branched, saturated or unsaturated, the chain optionally containing at least one aromatic or non-aromatic ring; and the dose of additive(s) B1, per ton of bituminous product, being between 0.3 kg and 20 kg; wherein the additive B optionally contains phosphoric acid, the dose of phosphoric acid per ton of bituminous product being less than 2 kg; wherein the additive B optionally contains at least one pyrophosphate of the compound B1, in a dose per ton of bituminous product of less than 20 kg; and wherein the bituminous product has a difference between the penetration index before contact with the aggregates and the penetration index after extraction of the asphalt mixture of less than 5 tenths of a millimeter for a bitumen having an initial penetration index between 20 and 30 tenths of a millimeter, of less than 15 tenths of a millimeter for a bitumen having an initial penetration index between 35 and 50 tenths of a millimeter, of less than 20 tenths of a millimeter for a bitumen having an initial penetration index between 50 and 70 tenths of a millimeter, of less than 25 tenths of a millimeter for a bitumen having an initial penetration index between 70 tenths of a millimeter and 100 tenths of a millimeter, of less than 50 tenths of a millimeter for a bitumen having an initial penetration index between 160 and 220 tenths of a millimeter.