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