PennDOT Strategic Recycling Program Highlights. Background. Apex holds multiple contracts with PENNDOT Technical Assistance to Strategic Environmental Management (SEM) Program Office.
Strategic Recycling Program
The objective of the SRP is “to realize economic savings and environmental enhancement to PENNDOT and the Commonwealth through the continued development of pollution prevention, recycling, energy efficiency, and sound environmental management practices”.
Five key focus areas will be targeted to achieve and sustain PENNDOT’s mission to increase utilization of recycled materials in transportation engineering applications:
PENNDOT Engineering Districts
Ground asphalt shingles for use as an asphalt additive
The SRP allows PENNDOT to systematically implement and sustain its recycling program. Factors that are critical to the success of this program are:
Glass cullet as aggregate in base course asphalt along shoulder of SR4013 in Manheim, Lancaster County.
Installation of 2,000 tons of glass cullet between jersey barrier and sound wall along I-95 in Tinicum, Delaware County.
Test trench containing
flowable fill with recycled
foundry sand as aggregate.
Other usable aggregates
include cullet, ash, and slag.
Flowable fill is used to
backfill utility trenches,
Spent mushroom soil and
composted biosolids used as soil
amendment and mulch for new
plantings at Beltway Beautification
Project. (I-81/Rt. 322 interchange)
Carsonite sound wall on I-78 bridge over Veracruz Road (Lehigh County). These sound walls are lightweight, modular, and contain recycled rubber.
Asphalt containing ~1.5% TRPA substituted for stone aggregate.
Incorporated in 9.5 mm Superpave wearing course
TRPA: treated recycled plastic aggregate (shredded plastic)
Engineering District 5-0
115 tons @ $78.89/ton
400 tons (lump sum bid)
SR 4033, Bucks County, Engineering District 6-0
Control Section: 9.5 mm Superpave Virgin AC (1,300 tons)
1st Section: 9.5 mm Superpave w/ 5% shingles (1,000 tons)
2nd Section: 9.5 mm Superpave w/ 5% shingles, 10% RAP (1,000 tons)
Bid as conventional paving
Contractor initiated substitution
2-3 days paving
Shingles 1.5% Asphalt content
100% passing 0.5-inch sieve
95% passing 3/8-inch sieve
RAP 0.5 % Asphalt content
LENGTH: Not more than 1% and 10% (by weight) having a maximum dimension greater than 18-inches and 12-inches, respectively.
3 inches50% max.
1.5 inches25% max.
No. 41% max.
No oils, gasoline, diesel fuel, hydraulic fluid, grease, ice, and snow. No burnt tires.
Less than 1% by weight of metal fragments.
Provide at least 76% and 90% (by weight) of tire shreds with metal fragments encased in rubber that do not protrude more than 1- and 2-inches, respectively, from the cut edge of tire shreds.Tire Shred Specifications (cont’d)
Water Pressure (psi or kPa)
Temperature (°C or °F)
Cable lengths custom made
Pressure (psi or kPa)
Embedded and calibrated in
1 ft by 1 ft concrete pads
Flush-mounted on abutment
formwork facing fill
ASTM D421, D422
Direct Shear Test†
CD* Triaxial Test†
US Army COE
Key Crushed Glass Properties
Sand Filters (Wastewater)
Well Packing Media
Septage Field Media
Leachate Collection Media
Glass Cullet Applications
Kenneth J. Thornton, PG
PENNDOT Pollution Prevention Section
400 North Street
Harrisburg, PA 17105