United States Department of Transportation
i
Seal coat quality : does low cost mean low quality? : project summary.
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2017
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Alternative Title:0-6747 : seal coat quality : does low cost mean low quality?
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Abstract:In the laboratory test program for aggregates, the research team found that the gravel aggregates, which are also SAC A aggregates, performed the best in terms of wear resistance as measured with the methods described here. The remaining aggregates, which consisted of limestones, limestone rock asphalt (LRA), and lightweight aggregate, exhibited a range of wear characteristics. One of the limestone sources exhibited very poor performance in the micro-Deval test and yet performed like the other limestones in the abrasion resistance test. The abrasion resistance test does seem to distinguish between different SAC B materials and generally indicates that the LRA aggregates are poor performers in terms of wear resistance. This also seems to be consistent with field reports. Lightweight aggregate, a very popular seal coat aggregate with unique properties, also performed poorly in the abrasion resistance test.
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