Microsurfacing (2010) / Chapter Skim
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The mixture is made by a specialized machine and placed on a continuous basis by mixing the materials simultaneously in a pug mill. Figure 1 shows the process in the microsurfacing machine, which results in a free flowing composite material, spread on the underlying pavement using a spreader box.
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. Research in Minnesota, which is case studied in chapter eight, has shown that using a softer binder shows the potential to reduce the level of reflective cracking (Johnson et al.
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7gases by keeping good roads good (Chehovitz and Galehouse 2010)
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The Asphalt Emulsion Manufacturers Association (AEMA) states that microsurfacing is an alternative to hot mix for rut filling (AEMA n.d.)
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"A Bituminous Slurry Surfacing, usually containing polymer, which is capable of being spread in variably thick layers for rut-filling and correction courses, and for wearing course applications requiring good surface texture." "A thin layer of Bituminous Slurry Surfacing, usually without a polymer modifier." AEMA = Asphalt Emulsion Manufacturer's Association. 9 TABLE 2 CURRENT DEFINITIONS FOR MICROSURFACING AND SLURRY SEAL Differences In: Microsurfacing Slurry Seal Asphalt Emulsion Always polymer modified, quick set Could be polymer modified Aggregate Quality/Gradation Stricter specifications for sand equivalent; use only Type II and Type III Can use Type I, II, or III Additives/Break Chemical break largely independent of weather conditions Breaking and curing dependent on weather conditions Mix Stiffness/Equipment Stiffer mix, use augers in the spreader box and secondary strike-off Softer mix, use drag box Applications Same as slurry seal + rut filling, night work, correction of minor surface profile irregularities Correct raveling, seal oxidized pavements, restore skid resistance Source: Caltrans (2009)
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• Chapter eight -- Case Studies: Six case studies from five states and one Canadian province are presented, highlighting specific aspects of microsurfacing success at the agency level. • Chapter nine -- Conclusions: This chapter synopsizes the conclusions and effective practices found in the report and makes recommendations for future research to fill gaps in the body of knowledge.
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