This work consists of constructing a cold-laid, polymer-modified, emulsified asphalt pavement course to fill ruts or provide an intermediate or surface course for existing pavements. The paving mixture is composed of a polymer-modified emulsified asphalt, crushed aggregate, mineral filler, water, and possibly other additives. Follow the requirements outlined in ASTM D 6372, Standard Practice for Design, Testing, and Construction of microsurfacing, with modifications as found in this note. Apply this material according to the lines, grades, and typical cross-sections in the plans or as established by the Engineer. Unless otherwise noted, Section references herein are to the Department’s Standard Specifications for Road and Bridge Construction, current edition. All applicable portions of the Department’s Standard Specifications apply unless specifically modified herein. 2. MATERIALS AND EQUIPMENT. 2.1 Mineral Filler. Use Portland Cement, Type I, conforming to Section 801. 2.2 Aggregate. Provide 100-percent crushed aggregate conforming to Sections 804 and 805. Contrary to Subsection 403.03.03, provide polish-resistant aggregate in the asphalt mixture conforming to one of the following requirements: Microsurfacing Type A x 100 percent of total combined aggregate is Class A polish-resistant aggregate. Microsurfacing Type B x 100 percent of total combined aggregate is Class B or Class A polishresistant aggregate. Microsurfacing Type D x No polish-resistant aggregate requirements. Contrary to ASTM D 6372, test sand equivalent according to AASHTO T 176, soundness according to Kentucky Method (KM) 64-610, and a maximum LA abrasion resistance of 35 percent when tested according to AASHTO T 96. Ensure all aggregates satisfy ASTM D 6372 for sand equivalent, soundness, and LA abrasion listed above. Do not use mineral aggregates that are inherently porous, such as blast-furnace slag, expanded shale, porous limestone, and lightweight aggregates, in this mixture. 2.3 Water. Conform to Section 803.
