The Hassan / Omann Shingles Recycling Demonstration Project A Presentation by Bill Boettner At the Dakota County Shingles Recycling Workshop On Tuesday, December 4, 2007

Who’s Who Local agency sponsor: Town of Hassan Original grant funding source: Minnesota Local Road Research Board’s (LRRB) Local Operational Research Assistance (OPERA) program Shingle recycler, HMA producer and paving contractor: Omann Brothers Second source of grant funding: Hennepin County Lead By Example Program Key partner: Mn/DOT

Who’s Who (continued) In-kind field support and technical assistance: Mn/DOT and Hennepin County DOT Third source of grant funding: Dakota County Additional lab work: Professor Mihai Marasteanu, U of MN Dept. of Civil Engineering Coordination and project management services: SWMCB via DKA

Project Objectives Test tear-off RAS in wear course Compare tear-off RAS vs. manufacturers’ RAS vs. virgin only HMA No RAP in any test mix Continue analysis of cost savings potential

Shingles Grinding by Omann ½-inch minus G.L. Roofing Company provided 12 tons of clean, certified tear-off shingles Written certification forms used to document compliance with state and federal rules Nails removed by a series of magnets

Shingles Grinding by Omann (continued) Three stage grinding process Nails removed by a series of magnets and a metal detector July 18, 2006 observation by Mn/DOT and Hennepin County RAS stockpiled for a month prior to use. “Fluffed” immediately prior to use in HMA plant.

Omann Paving August 22, 2006, Omann Brothers first graded and then compacted the gravel road in preparation for paving August 23, 2006, the base course of hot-mix asphalt was applied August 25, 2006 the wear course was applied

Lab Tests by Mn/DOT Core Density Testing (voids) % Binder Extraction Bending Beam Rheometer (BBR) PG Grading test Deleterious – Total Fiber – ASSHTO Method

Lab Tests by U of MN Indirect tensile (IDT) strength tests with the 6-inch gyratory pucks as prepared by Mn/DOT

Observations of Pavement Performance To-Date Mn/DOT has conducted two field surveys – March 2007 – September 17, 2007 Cracking – No observed pre-mature cracking Rutting – Using a FACE Dipstick® – Slight and irregular rutting with no significant difference between mix types

Media Coverage News release issued by Hennepin County WCCO radio MPR Finance & Commerce Journal Northwest Community TV & Channel 12 Minnesota Local Technical Assistance Program (MnLTAP) article in Technology Exchange

Other Presentations and Video * Hassan / Omann Project web pageHassan / Omann Project web page on

For More Information Eddie Johnson, Mn/DOT: Unpublished report on Rutting “Dipstick” Survey (October 2007) Jim McGraw, Mn/DOT: Power Point presentation to July 11, 2007 project close-out meeting Mihai Marasteanu, U of MN: Power Point presentation to July 11, 2007 project close-out meeting Debra Haugen, DKA: Final Report to LRRB (May 31, 2007)

THANKS! Bill Boettner, Public Works Supervisor Town of Hassan