A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Modifiers and Fillers
Abstract This chapter presents a summary of how fillers (active and inert) impact the rheological properties of asphalt binders including adding stiffness and fracture toughness due to their ability to adsorb energy by “crack pinning” mechanisms and diffusion of crack growth. Active fillers such as hydrated lime are somewhat compatible with the acids within asphalt binder and can sorb components from the asphalt, such as carboxylic acids to form an interlayer between the hydrated lime and the asphalt. The net result of this interaction is to improve the asphalt–aggregate bond and to magnify the volume filler effect such that the active filler has a substantially greater rheological impact than equal volume of inert filler. This chapter summarizes key research by Lesueur (2009) to describe a colloidal picture of the asphalt microstructure. Lesueur explains that such suspensions can be viewed as special cases of emulsions and, in certain cases, as a suspension of viscoelastic solids in a viscoelastic matrix. This chapter addresses polymer stabilization of asphalt binders by adding both plastomers and elastomers to the asphalt binder. A fundamental explanation of how such polymer additives interact with asphalt binder is used to explain the practical implications of polymer modification and how relatively low additive amounts of polymer by weigh of asphalt binder can result in an inverted matrix, where the swollen polymer additive forms a continuous matrix within the polymer–asphalt blend. The use of elemental sulfur, a by-product of gas and petroleum de-sulfuring and available in large quantities throughout much of the industrialized world, is addressed as an asphalt extender and stiffener.
Modifiers and Fillers
Abstract This chapter presents a summary of how fillers (active and inert) impact the rheological properties of asphalt binders including adding stiffness and fracture toughness due to their ability to adsorb energy by “crack pinning” mechanisms and diffusion of crack growth. Active fillers such as hydrated lime are somewhat compatible with the acids within asphalt binder and can sorb components from the asphalt, such as carboxylic acids to form an interlayer between the hydrated lime and the asphalt. The net result of this interaction is to improve the asphalt–aggregate bond and to magnify the volume filler effect such that the active filler has a substantially greater rheological impact than equal volume of inert filler. This chapter summarizes key research by Lesueur (2009) to describe a colloidal picture of the asphalt microstructure. Lesueur explains that such suspensions can be viewed as special cases of emulsions and, in certain cases, as a suspension of viscoelastic solids in a viscoelastic matrix. This chapter addresses polymer stabilization of asphalt binders by adding both plastomers and elastomers to the asphalt binder. A fundamental explanation of how such polymer additives interact with asphalt binder is used to explain the practical implications of polymer modification and how relatively low additive amounts of polymer by weigh of asphalt binder can result in an inverted matrix, where the swollen polymer additive forms a continuous matrix within the polymer–asphalt blend. The use of elemental sulfur, a by-product of gas and petroleum de-sulfuring and available in large quantities throughout much of the industrialized world, is addressed as an asphalt extender and stiffener.
Modifiers and Fillers
Little, Dallas N. (author) / Allen, David H. (author) / Bhasin, Amit (author)
2017-09-28
50 pages
Article/Chapter (Book)
Electronic Resource
English
Modifiers , Extenders , Adhesion-promoting agents , Acid modification , Active fillers , Hydrated lime , Polymers , Plastomers , Elastomers , Palierne model Engineering , Building Materials , Structural Materials , Continuum Mechanics and Mechanics of Materials , Nanotechnology and Microengineering , Geoengineering, Foundations, Hydraulics , Transportation
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