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Scope of Work:
- The existing parking areas had reflective cracking and drainage problems, caused by a series of old asphalt-concrete overlays placed within the last 20 years.
- Since the existing sub grade conditions contained a well graded sand course, the engineer recommended the option of recycling the existing asphalt-concrete pavement.
- The existing parking areas and entrance roads were cold milled to a depth of 4.5", using a company owned Wirtgen DC2100 milling machine. The material was stockpiled on-site at the school’s bus garage.
- The recycled asphalt pavement (RAP) was screened to 2" minus at the stockpile area.
- The RAP was then loaded into the cold bins of a Midland Portable Pugmill and mixed with HSMS-2 asphalt emulsion. The emulsion was mixed at a rate of 10 gallons per ton of recycled asphalt pavement.
- Trucks were then loaded directly under the pugmill discharge shoot.
- The cold mix binder was hauled to the parking areas and placed with a Vogele pre-comapction paver. The mix was compacted to 95% using a pneumatic roller and a steel drum vibratory roller.
- Mixing HFSM-2 asphalt emulsion at 160 degrees with the recycled pavement produced 3300 tons of cold mix binder.
- The process of milling, screening, mixing and placing recycled materials on-site led to considerable cost savings that were passed on to the owner. The estimated savings to the school district was $81,000 representing a savings of 37% compared to removing and replacing the existing pavement with a new binder course.
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