Polymer Modified Asphalt Emulsion

Polymer Modified Asphalt Emulsion - ByThanachartSubgranon...

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By Thanachart Subgranon
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1. Introduction Polymer modified asphalt emulsions are products of polymer modification of asphalt emulsions. 1.1 Overall benefits of polymer modified asphalt mulsions ver unmodified asphalt emulsions (1) emulsions over unmodified asphalt emulsions Increase in rutting resistance. crease in thermal cracking resistance Increase in thermal cracking resistance. Increase in traffic induced stress resistance (fatigue cracking). Increase in stone retention. Faster setting (minimize land closures and traffic delay). Longer life cycle with same equivalent cost.
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2. Basic Terminology 2.1 Polymer ther natural or synthetic polymer consists of a small Either natural or synthetic, polymer consists of a small, simple, and repeating chains of organic compounds called monomers. Compound jointing of two or more different monomers is called copolymer. (1) Figure 1: Example of Copolymers (1)
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2.2 Asphalt Emulsions Asphalt emulsions are produced by a mixing of asphalt and emulsifying agent (surfactant) creating micro asphalt droplets dispersed in water. Asphalt emulsions are classified by the types of surfactants which can be anionic, cationic, d nonionic. and nonionic. Figure 2: Type of emulsions (2)
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2.3 Polymer Modified Asphalt (PMA) Polymer modifiers make changes in the structure of asphalt binders resulting in the modification of key physical ) properties which are: (1) Elasticity Tensile strength High temperature susceptibility Low temperature susceptibility Viscosity Adhesion and cohesion
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Figure 3: Photomicrographs of polymers in asphalt (1) Compatible Incompatible The polymers enhance the asphalt properties by forming a continuous network within the binders. There must be mpatibility between polymers and binders in order to compatibility between polymers and binders in order to create a uniform connected network. In the incompatible case, the polymers will group themselves and are not connected.
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3. Types of Polymer Modifier yp y 3.1 Classification The polymer modifiers are firstly classified into two general groups based on their characteristics at low temperature. 1) Elastomeric polymers having very highly yield property. 2) Plastomeric polymers having very highly strength property. oth are again separated to two another classes by their Both are again separated into two another classes by their temperature rearranged structural characteristics. ) hermoset polymers ked etwork n ot be reversed 1) Thermoset polymers linked network cannot be reversed upon reheating. 2) Thermoplastic polymers – linked network can be reversed upon reheating.
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3.2 Polymer Types There are six types of polymer including: 1) Natural rubber and latex is an elastomeric hydrocarbon polymer found in many plants.
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This note was uploaded on 05/26/2011 for the course CGN 6505 taught by Professor Mang during the Spring '11 term at University of Florida.

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Polymer Modified Asphalt Emulsion - ByThanachartSubgranon...

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