STRATEGIC RECYCLING PROGRAM FACT SHEET - …

1 PennDOT District 3-0 SMA crumb Rubber Microsurfacing Project STRATEGIC RECYCLING PROGRAM fact SHEET Project: Stone Matrix Asphalt (SMA) with crumb Rubber Wearing Course Site Location: PennDOT District 3-0 Lycoming County, SR 0015 Date of Project: June 2006 Recycled Material: crumb Rubber Estimated Quantities: 975 CF crumb Rubber ( tons) miles length crumb Rubber by Weight of Total Mix Did You Know? Since 2001 PennDOT has used more than 6,560 tons of waste tires on civil engineering practices. This includes PennDOT s District 10-0 Tarrtown Bridge Em-bankmnet Project (Armstrong County) - use of 6,500 tons of scrap tires, and District s 1-0 Microsurfacing Project (Erie County) that used 54 tons SMA crumb rubber. OVERVIEW OF PROJECT: PennDOT District 3-0 completed a microsurfacing rehabilitation project on State Route 0015 Segment 1551-Offset 0000, southbound in Lycoming County in June 2006.

2 The process known as microsurfacing consists producing a poly-mer-modified emulsified asphalt mixture that contains dense-graded crushed fine aggregate, mineral filler, and the addition of crumb rubber material. The properties of microsurfacing is said to enhance, pro-tect and/or rehabilitate paved surfaces. Approximately miles of highway were paved using Stone Matrix Asphalt (SMA) modified with crumb rubber in a thin -inch wearing course. The purpose of this project was to extend the life-cycle of the wearing course, monitor the SMA perform-ance towards reducing thermal cracking, rutting, and reflective cracking. Other per-formance factors that will be closely watched include durability and skid resis-tance. One week prior to the actual pro-ject start, a control section (1/4 mile) was paved as using a PG76-22 design mix modified with (by total weight) crumb rubber in one direction, and PG 64-22 de-sign mix with a crumb rubber com-ponent.

3 This was done to allow the con-tractor, HRI Inc., and PennDOT District 3-0 to determine the lift and placement prop-erties and observe any differences be-tween the two mixtures. PG 64-22 asphalt binder with crumb rubber addition (by total weight) was selected as the final design. Additionally, the design mix used stone aggregate limited to mm in size, another experimental first with Penn DOT. FY 2007 Since the 1990 s PENNDOT has been ex-perimenting with the addition of crumb rubber in paving projects. Initially this was part of a proactive PROGRAM that addressed the Intermodal Surface Transportation Efficiency Act (ISTEA) Section 1038 legisla-tion. ISTEA required to use scrap tires in federal funded highways at a 5% level by 1994 and up to a maximum of 20% by 1997.

4 In the mid 1990 s PennDOT imple-mented three experimental projects that used asphalt modified with treated crumb - rubber material. The performance of these earlier experi-mental projects was mixed. However, more recent projects, such as the one exe-cuted in District 1-0 on SR 0086 (2005) that used crumb rubber in a thin wearing coarse show promising results. INTRODUCTION: Paving of SMA crumb rubber. ject s ongoing evaluation and final report. As part of PennDOT s STRATEGIC RECYCLING Pro-gram (SRP), the Pennsylvania Department of Environmental Protection (PADEP) underwrote the material costs on this project, funding 73% of the total $186,000 project costs. This pro-ject demonstrates PennDOT s continued com-mitment to find solutions to create longer last-ing pavements, and safer roads in this case the use of PA recycled tires.

5 HRI Inc. placed approximately 2500 tons of SMA that included approximately tons of crumb rubber by weight contributing to the mix. crumb rubber was added to the asphalt binder using a wet shear blending method. Three stan-dard vibratory rollers were used for compaction. On-site density readings were taken during pavement and were within acceptable ranges of 91- 96% maximum theoretical density. In addi-tion core samples were taken and were ana-lyzed by District 3-0 to be include in this pro-PROJECT OVERVIEW (cont.) Project Information: The Pollution Prevention Section PROGRAM Office can be contacted for further information at (717) 783-3616. Project Contacts: Mr. Vance Cohick from PENNDOT Dis-trict 3-0 was the onsite Pavement Manager Maintenance Dept. (ph: 570-368-4408).

6 Mr. Justin Blackeney was the Materials Engineer Construction Dept. (ph: 570-368-4258). Mr. Tom Squires was the Assis-tant Materials Manager Construction Dept. (ph: 570-368-4371) Contractor: HRI, Inc., 3485 W 4th Street, Williamsport, PA 17701-4104, ph: 570-326-9031 Go to the PennDOT website at: Click on More Links STRATEGIC Recycle PROGRAM for more infor-mation. Wearing coarse (3/4 inch) thick Troxler nuclear moisture / density gauge test. STRATEGIC RECYCLING PROGRAM fact SHEET FY 2007