153x Filetype PPTX File size 0.51 MB Source: www.pavementpreservation.org
Question for the Group Innovation – Quality - Service • Can one perform a solvent extraction on microsurfacing mix to accurately determine asphalt content? Microsurfacing and Asphalt Content Innovation – Quality - Service • How do we check the asphalt content of a microsurfacing mix? –Do we need to check AC content? –Agencies are interested in developing a QC tool • Do we treat this type of a mix like a standard bituminous mix? –Solvent Extraction –Type of Solvent? –Ignition Oven? Experiment Innovation – Quality - Service • Let’s set up an experiment • Limestone Aggregate Mix • Trichlorethylene solvent • Typical 11.5% latex modified emulsion with cement • Same mix with no cement • Same mix with cement, no latex • How do the results compare? What should we expect Innovation – Quality - Service • If we have a micro mix with a emulsion content of 11.5%, • What should we expect asphalt content to be? • Assuming 65% solids, Asphalt residual content is 7.5% • So what should we hope to get for the extraction? • 7.5% ? • How about 7.0% – (Dry weight of Aggregate versus total weight of mix) DATA!! Innovation – Quality - Service Mix 1 (7.5% RC, Mix 2 (7.5% RC, Mix 3 (7.5% RC, No Cement) Cement) No Latex/No Cement) Aggregate 500 500 500 Portland Cement 0 5 0 Water 65.9 61.3 64.6 Emulsion 57.6 57.6 59.6 Total Mix Weight (g) 623.5 623.9 624.2 Emulsion Residue (%) 65.1% 65.1% 63.3% Mass of Asphalt 37.5 37.5 37.7 Asphalt Content (%) TWM 7.0% 6.9% 7.0% Cured Mix (g) 537.3 543 537.7 Extracted Agg Mass 500.4 506.2 500.4 AC% 6.9 6.8 6.9
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