Abstract: Asphalt emulsion compositions for use in priming a granular surface such as a road bed are provided. The asphalt emulsion comprises asphalt, an amphoteric emulsifier, and water. The asphalt emulsion priming composition may be used on road beds to prepare the road bed for paving. Application of the asphalt emulsion priming composition to a granular surface, such as a road bed, can provide several advantages, including reducing or eliminating dust generated by traffic on the granular surface.

Abstract: Polyphosphoric acid compositions having a reduced viscosity compared to neat polyphosphoric acid. The viscosity of the polyphosphoric acid is reduced by combining the polyphosphoric acid with an additive that reduces the viscosity of the polyphosphoric acid composition. In one embodiment, additives that can cause solvation and/or partial neutralization of the polyphosphoric acid without the addition of water may be used. The reduced viscosity polyphosphoric acid may be used, for example, as an additive in asphalts used in road pavements.

Abstract: Methods are provided for preparing a bitumen product having improved properties for use in asphalt road paving. In a preferred embodiment, polyphosphoric acid is added to heated bitumen and stirred for a period of time. After addition of the polyphosphoric acid, one or more sulfur-crosslinkable elastomers and one or more sulfur donor coupling agents is added to the heated bitumen and mixed. The polyphosphoric acid, sulfur-crosslinkable elastomers and sulfur donor coupling agents may also be added to separate quantities of bitumen, and the bitumens may be combined prior to use to obtain a final bitumen product having the desired characteristics.

Abstract: The present invention relates to the use of an exothermic mixture of at least i) an acidic anhydride or an acid salt and of at least ii) a basic anhydride or a basic salt, in a cold, warm or semi-warm bituminous mix based on a bituminous binder containing water in order to increase the temperature of the bituminous mix. It also relates to a process for manufacturing a bituminous mix using the exothermic mixture, to the bituminous mix capable of being obtained by this process and to the use thereof for the manufacture of a road surface. It additionally relates to the use of the exothermic mixture in order to dry the aggregates and to the aggregates containing this mixture. Finally, it relates to the use of the exothermic mixture in a bitumen emulsion.

Abstract: The present invention relates to a modified asphalt binder composition comprising: a. 70-85% by weight asphalt binder b. 0.1-5% by weight PPA c. 0.5-30% by weight supramolecular rubber.

Abstract: The present invention relates to a method for producing a crumb rubber modified asphalt comprising the steps of: a) heating a pre-selected quantity of asphalt to a temperature of between about 325° F. to 550° F.; b) adding crumb rubber and a mineral acid to the heated asphalt with stirring; and c) blowing air through the asphalt, crumb rubber and mineral acid mixture.

Abstract: Bituminous asphalt binder materials which are modified by the addition of crumb rubber or ground tire rubber and a cross-linking agent are described. In addition, methods are provided for producing a modified asphalt binder containing crumb rubber or ground tire rubber and a cross-linking agent. The modified asphalt binders comprise neat asphalt, crumb rubber, one or more acids and a cross-linking agent. Optionally, the modified asphalt binder may include one or more polymer additives. The crumb rubber may be obtained from recycled truck and/or automobile tires. The addition of crumb rubber in asphalt binders can improve the consistency and properties of the asphalt binders at high and low temperatures. In particular, the modified asphalt binders of the present invention exhibit improved elastic behavior, resulting in improved performance of roads or other surfaces paved using the modified asphalt binder.

Abstract: Pavement compositions containing increased amounts of reclaimed asphalt pavement (RAP) are described. Addition of polyphosphoric acid (PPA) to pavement compositions containing RAP allows increased RAP content in road pavements while maintaining acceptable properties in the final pavement composition. Methods for producing road pavements containing RAP and PPA are also provided.

Abstract: Improved asphalt pavement mixes containing calcium phosphate and processes for producing the improved pavement mixes are provided. The asphalt pavement compositions comprise aggregate, asphalt binder and calcium phosphate. The improved pavement mixes may be produced by blending calcium phosphate with the aggregate prior to combining the aggregate with the asphalt binder. Alternatively, the calcium phosphate may be mixed with the asphalt binder prior to adding the aggregate to the asphalt binder. The addition of calcium phosphate to the asphalt pavement mixtures can improve the stiffness or the moisture resistance of the asphalt pavement mix.

Abstract: The invention concerns a bitumen emulsion-based surfacing composition or bituminous mix consisting of an amphoteric surfactant and its use in road highway engineering for making materials for new roads, for reinforcing or maintaining old roads or for punctually repairing same.

Abstract: A process is provided for producing an improved asphalt composition is air blown for a reduced period of time prior to addition of polyphosphoric acid. The air blowing process is performed at temperatures and using air volumes typically used for air blown asphalt. The process may be performed using neat asphalt, or it may be used on mixtures of asphalt with flux, slop, or mixtures of flux and slop. After the initial air blowing period, polyphosphoric acid is added to the asphalt. The polyphosphoric acid may be added while the asphalt is at temperature, or the asphalt may be allowed to cool slightly before the addition of the polyphosphoric acid. Following addition of the polyphosphoric acid, the asphalt may undergo further air blowing to obtain desired properties.

Abstract: Asphalt emulsion compositions for use in priming a granular surface such as a road bed are provided. The asphalt emulsion comprises asphalt, an amphoteric emulsifier, and water. The asphalt emulsion priming composition may be used on road beds to prepare the road bed for paving. Application of the asphalt emulsion priming composition to a granular surface, such as a road bed, can provide several advantages, including reducing or eliminating dust generated by traffic on the granular surface.

Abstract: The invention concerns a bitumen emulsion-based surfacing composition or bituminous mix consisting of an amphoteric surfactant and its use in road highway engineering for making materials for new roads, for reinforcing or maintaining old roads or for punctually repairing same.

Abstract: Bituminous asphalt binder materials which are modified by the addition of crumb rubber or ground tire rubber and a cross-linking agent are described. In addition, methods are provided for producing a modified asphalt binder containing crumb rubber or ground tire rubber and a cross-linking agent. The modified asphalt binders comprise neat asphalt, crumb rubber, one or more acids and a cross-linking agent. Optionally, the modified asphalt binder may include one or more polymer additives. The crumb rubber may be obtained from recycled truck and/or automobile tires. The addition of crumb rubber in asphalt binders can improve the consistency and properties of the asphalt binders at high and low temperatures. In particular, the modified asphalt binders of the present invention exhibit improved elastic behavior, resulting in improved performance of roads or other surfaces paved using the modified asphalt binder.

Abstract: In a first aspect, bituminous asphalt binder materials which are modified by the addition of crumb rubber or ground tire rubber are described. In a second aspect, the present invention is directed to methods of producing a modified asphalt binder containing crumb rubber or ground tire rubber. The modified asphalt binders comprise neat asphalt, crumb rubber, one or more synthetic polymers, and one or more acids. The crumb rubber may be obtained from recycled truck and/or automobile tires.

Abstract: In a first aspect, bituminous asphalt binder materials which are modified by the addition of crumb rubber or ground tire rubber are described. In a second aspect, the present invention is directed to methods of producing a modified asphalt binder containing crumb rubber or ground tire rubber. The modified asphalt binders comprise neat asphalt, crumb rubber, one or more synthetic polymers, and one or more acids. The crumb rubber may be obtained from recycled truck and/or automobile tires.

Abstract: Bituminous asphalt binder materials which are modified by the addition of crumb rubber or ground tire rubber and a cross-linking agent are described. In addition, methods are provided for producing a modified asphalt binder containing crumb rubber or ground tire rubber and a cross-linking agent. The modified asphalt binders comprise neat asphalt, crumb rubber, one or more acids and a cross-linking agent. Optionally, the modified asphalt binder may include one or more polymer additives. The crumb rubber may be obtained from recycled truck and/or automobile tires. The addition of crumb rubber in asphalt binders can improve the consistency and properties of the asphalt binders at high and low temperatures. In particular, the modified asphalt binders of the present invention exhibit improved elastic behavior, resulting in improved performance of roads or other surfaces paved using the modified asphalt binder.

Abstract: Methods are provided for preparing a bitumen product having improved properties for use in asphalt road paving. In a preferred embodiment, polyphosphoric acid is added to heated bitumen and stirred for a period of time. After addition of the polyphosphoric acid, one or more sulfur-crosslinkable elastomers and one or more sulfur donor coupling agents is added to the heated bitumen and mixed. The polyphosphoric acid, sulfur-crosslinkable elastomers and sulfur donor coupling agents may also be added to separate quantities of bitumen, and the bitumens may be combined prior to use to obtain a final bitumen product having the desired characteristics.

Abstract: Bituminous asphalt binder materials which are modified by the addition of crumb rubber or ground tire rubber and a cross-linking agent are described. In addition, methods are provided for producing a modified asphalt binder containing crumb rubber or ground tire rubber and a cross-linking agent. The modified asphalt binders comprise neat asphalt, crumb rubber, one or more acids and a cross-linking agent. Optionally, the modified asphalt binder may include one or more polymer additives. The crumb rubber may be obtained from recycled truck and/or automobile tires. The addition of crumb rubber in asphalt binders can improve the consistency and properties of the asphalt binders at high and low temperatures. In particular, the modified asphalt binders of the present invention exhibit improved elastic behavior, resulting in improved performance of roads or other surfaces paved using the modified asphalt binder.

Abstract: In a first aspect, bituminous asphalt binder materials which are modified by the addition of crumb rubber or ground tire rubber are described. In a second aspect, the present invention is directed to methods of producing a modified asphalt binder containing crumb rubber or ground tire rubber. The modified asphalt binders comprise neat asphalt, crumb rubber, one or more synthetic polymers, and one or more acids. The crumb rubber may be obtained from recycled truck and/or automobile tires.