Constructability of Polymer-Modified Asphalts and Asphalt-Aggregate Mixtures in Alaska
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1999-03-01
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TRIS Online Accession Number:00811011
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Edition:Final Report
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Abstract:Polymer-modified asphalt usage in Alaska raises two important issues. The first concern is about the compatibility and storage stability when polymers are used with Alaskan crude oils. Secondly, the ability of the contractor to place polymer-modified mixes continues to trouble construction personnel. This study addresses both these issues. After an extensive literature review, the compatibility of the polymer and the asphalt cement was investigated using fluorescent microscopic images and elasticity tests. Separation tests provided an indication of storage stability. Conventional test methods including penetration, softening point and viscosity at several temperatures indicated consistency of the binders. Of the 36 polymer-modified binders mixed in the laboratory, only a few met the criteria set for the compatibility, storage stability, improved temperature susceptibility and mixing temperature. Storage stability and maximum allowable mixing temperatures were the most discriminating factors. Both cause construct-ability problems in polymer-modified asphalt mixtures. Seven polymer-modified binders and three traditional binders were analyzed using Super Pave binder tests. Asphalt-aggregate mixtures were subjected to the Thermal Stress Restrained Specimen Test and Georgia Wheel Rutting Test. Tests indicate that polymer-modification improved the performance of all base asphalts. However, some binders smoke excessively when the temperature was elevated to the recommended mixing temperature. This issue warrants further investigation.
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