The Scott County Engineer's Office in partnership with the Waste Commission of Scott County has prepared plans to incorporate recycled asphalt shingles (RAS) into the aggregate surfacing along 190th Street between the City of Walcott corporate limits and the end of paving near Y48 (about 3.1 miles).
By incorporating RAS into this aggregate surfaced road, we strive to achieve the following goals:
We will construct test sections of varying mixing proportions, pre-mixed vs. mixed on the road, and compacted vs. non-compacted on 190th Street. The test sections are tentatively scheduled to be built May 7–15, 2018. The RAS will be obtained from the Scott Area Landfill and is made from tear-off shingles with one pass through the grinder. Existing road aggregate will be used for mixed on the road sections and virgin aggregate will be used for pre-mixed sections. The aggregate used for the surfacing is Scott County Modified Class D Crushed Stone, which is defined as 100% passing the 1 1/4" sieve, 90-100% passing the 1" sieve, 10-30% passing the No. 8 sieve, 5-12% passing the No. 200 sieve, the abrasion shall not be more than 45%, the mudball maximum is 4%, and the freeze/thaw loss shall not be more than 10%.
Since 2004, the Waste Commission of Scott County has diverted over 60,000 tons of asphalt shingles from the landfill. Most of this tonnage has been ground and used in Hot Mix Asphalt (HMA), however local agencies have begun investigating the use of RAS on aggregate surfaced roads. In 2016, we built four test sections on secondary roads in Scott County and continue to evaluate their performance.
|8:45 - 9:00 am||Sign in, coffee and donuts|
|9:00 - 9:45 am||Presentation and project discussion|
|10:00 - 11:15 am||190th Street site visit|
|11:15 - 12:00 pm||Optional visit to Scott Area Landfill and/or General Asphalt Construction Company to view pre-mixing operations, if still in operation|
This open house event will be weather dependent and may be moved to an alternate date if needed.
County engineers, field technicians, waste commission staff, landfill operators, and other interested staff.