ESTABLISHMENT OF ACCEPTANCE LIMITS FOR 5-CYCLE MSS AND MODIFIED WET BALL MILL TESTS FOR AGGREGATES USED IN SEAL COATS AND HMAC SURFACES. FINAL REPORT

This research report evaluates the performance of aggregates from several sources commonly used throughout Texas. The aggregate selection was primarily based on the magnesium sulfate soundness (MSS) loss. Aggregates used in the project had a range of MSS values, with a large fraction of the total having mid-range MSS loss (more than 10.0 but less than 25.0). Included in the study were hot-mixed asphalt concrete (HMAC), seal coat, and micro-seal pavement surfacing. Pavement test sites were selected to provide a range of traffic. Other laboratory tests performed for this study include Texas degradation, Los Angeles abrasion, and polish value. Evaluation of the pavement surfaces included frictional resistance, macro-photographs, surface texture, and condition rating. Regression equations have been developed to predict performance of different aggregates in pavement surfaces. A mini-texture meter was used for surface texture measurements. Micro- and macro-textural measurements were integrated in an attempt to forecast attendant frictional resistance.

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