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Abstract:Extensive research has been directed toward the addition of sulphur to asphaltic concrete mixes to function as either a quality aggregate or as an asphalt cement extender. By utilizing a high sulphur/asphalt ratio sulphur extended asphalt mix, it was believed that marginal aggregate could be substituted for quality aggregate. This report discusses the design, construction and evaluation of two such projects. One project, using an in-line blender to produce the binder, consisted of five inches of SEA sand base and two inches of SEA wearing course. The direct substitution method was used for a second project in which five inches of SEA sand base were laid. Each project was evaluated with respect to construction techniques, mix quality and performance. Results are presented for both projects which indicate that while the anticipated high mix strengths were attained at the plant, these strengths did not materialize in the field.
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