1999 STATEWIDE MICRO SURFACING PROJECT
This project introduced the use of micro surfacing as a pavement preventive maintenance surface treatment and tested different methods of using micro surfacing to correct or prevent defects in existing pavements. Micro surfacing mixtures include polymer-modified emulsified asphalt cement, a well-graded 100% crushed mineral aggregate, and mineral filler, such as portland cement or hydrated lime, with water and control additives added to control the speed of breaking and workability. Micro surfacing remains semi-liquid during mixing and placing phases and then cures chemically for a very durable asphalt surface treatment. Application and testing revealed that the fast-moving micro surfacing process minimizes the amount of down time for traffic; does an excellent job of reestablishing cross sections; fills ruts; improves ride quality; increases friction numbers; and provides an excellent background for pavement markings. It does not seal reflective cracks, has generated some concerns about increased traffic noise, and does not work favorably for smoothing humps in pavement. Overall, project selection played a key factor in the overall success of micro surfacing. A very thin surface treatment, microsurfacing cannot be expected to fix structural problems in existing pavements. One should avoid using micro surfacing on roadways that are still rutting and repair potholes before placement of micro surfacing.
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Corporate Authors:
Minnesota Department of Transportation
Office of Materials, 1400 Gervais Avenue
Maplewood, MN United States 55109 -
Authors:
- Wood, T J
- Geib, G
- Publication Date: 2001-6
Language
- English
Media Info
- Features: Appendices; Figures; Photos; Tables;
- Pagination: 50 p.
Subject/Index Terms
- TRT Terms: Asphalt emulsions; Crushed aggregates; Friction; Mineral fillers; Polymer asphalt; Preventive maintenance; Ride quality; Ruts (Pavements); Surface course (Pavements); Traffic noise
- Uncontrolled Terms: Microsurfacing
- Subject Areas: Highways; Maintenance and Preservation; I61: Equipment and Maintenance Methods;
Filing Info
- Accession Number: 00921477
- Record Type: Publication
- Report/Paper Numbers: MN/RC-2001-11,, Final Report
- Files: TRIS, ATRI, STATEDOT
- Created Date: Mar 7 2002 12:00AM