A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Physico-chemical modification of asphalt bitumens by reactive agents ; Modificación físico-química de betunes asfálticos mediante agentes reactivos
Bitumen, a by-product from crude oil distillation, has long been used in numerous engineering applications that range from the construction of road pavements to waterproof membranes for the roofing industry. On account of its properties (impermeability, adhesiveness, elasticity, ductility, etc.), bitumen is the most suitable material to be used as a binder of mineral aggregates for paving industry, and consequently, roads are mainly constructed using a composite mixture of bitumen (~ 5 wt.%) and mineral aggregates. Despite its small proportion, bitumen forms the continuous matrix and is the only deformable component in the pavements. Therefore, as bitumen is responsible for the viscoelastic behaviour characteristic of this material, it plays a relevant role in predicting roads performance. It is known that, after a limited life-time, the combined action of extreme temperatures along with a continuous increase in traffic loads may lead to well-known asphalts distresses. In this sense, a considerable research effort has been expended in modifying the properties of bituminous binders to improve the performance of road pavements. One of the major types of modifiers that have found wide acceptance in the paving industry is the polymer modified bitumen (PMB). A variety of polymers (SBS, SBR, EVA, SEBS, PE, etc.) have been developed to improve perceived limitations of the bitumen and mix to fatigue resistance, permanent deformation, thermal fracture and moisture sensitivity. Alternatively, the paving industry is also interested in development of modified bitumens by reactive agents such as polyphosphoric acid, sulfur, etc. These additives are capable of chemically interact with specific bitumen fractions and may help overcome that storage-related disadvantage. In order to get novel binders with enhanced Theological properties for road paving industry, we herein propose the use of different reactive agents: two non¬polymeric additives (thiourea dioxide and thiourea, abbreviated as “ThD” and “Th”, respectively) and a ...
Physico-chemical modification of asphalt bitumens by reactive agents ; Modificación físico-química de betunes asfálticos mediante agentes reactivos
Bitumen, a by-product from crude oil distillation, has long been used in numerous engineering applications that range from the construction of road pavements to waterproof membranes for the roofing industry. On account of its properties (impermeability, adhesiveness, elasticity, ductility, etc.), bitumen is the most suitable material to be used as a binder of mineral aggregates for paving industry, and consequently, roads are mainly constructed using a composite mixture of bitumen (~ 5 wt.%) and mineral aggregates. Despite its small proportion, bitumen forms the continuous matrix and is the only deformable component in the pavements. Therefore, as bitumen is responsible for the viscoelastic behaviour characteristic of this material, it plays a relevant role in predicting roads performance. It is known that, after a limited life-time, the combined action of extreme temperatures along with a continuous increase in traffic loads may lead to well-known asphalts distresses. In this sense, a considerable research effort has been expended in modifying the properties of bituminous binders to improve the performance of road pavements. One of the major types of modifiers that have found wide acceptance in the paving industry is the polymer modified bitumen (PMB). A variety of polymers (SBS, SBR, EVA, SEBS, PE, etc.) have been developed to improve perceived limitations of the bitumen and mix to fatigue resistance, permanent deformation, thermal fracture and moisture sensitivity. Alternatively, the paving industry is also interested in development of modified bitumens by reactive agents such as polyphosphoric acid, sulfur, etc. These additives are capable of chemically interact with specific bitumen fractions and may help overcome that storage-related disadvantage. In order to get novel binders with enhanced Theological properties for road paving industry, we herein propose the use of different reactive agents: two non¬polymeric additives (thiourea dioxide and thiourea, abbreviated as “ThD” and “Th”, respectively) and a ...
Physico-chemical modification of asphalt bitumens by reactive agents ; Modificación físico-química de betunes asfálticos mediante agentes reactivos
2013-09-20
Theses
Electronic Resource
English
DDC:
624
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