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Recycled Product Experience:

Recycled Glass Aggregate as Pipe Bedding at the Houghton Custodial Landfill

Product and recycled content Recycled glass aggregate
100% recycled
Application Pipe bedding
replaces pea gravel
Location/Date Houghton Landfill (Kirkland, WA)
Summer, 1994
Project manager/user John Komorita, Senior Engineer
Solid Waste Division, (206)296-4426
Architect/Engineer Associated Earth Sciences
Erick Miller,(206)780-9370
General Contractor Wilder Environmental
Steve Perrin, (206)637-2995
Background, history Published studies conducted by the Clean Washington Center supported use of this material
Performance Compaction and handling comparable to pea gravel
Source of material Cadman Gravel, (206)622-2065
Quantity 1100 tons of 5/8" minus
Cost $8.25 per ton delivered
compared to $11.50 delivered-pea gravel
Cost savings or increase Cost savings, about $3.00/ton cheaper
Installation, costs/savings Comparable
Source of extra funds None
Would you buy this product again? Yes, with reservations
Why or why not? There are maintenance concerns with using glass as pipe bedding in public projects (disposal of waste materials).
Comments Glass is not always available in the quantities needed. Check with your local supplier in advance.

Specifications:

Recycled Glass Aggregate - Solid Waste Division/Houghton Landfill

GLASS - Pipe-Bedding, Specifications
Section 2-03.2(1) Materials
B. Pipe Bedding
Pipe-bedding shall consist of 100% recycled glass cullet. Cullet shall conform to the following gradation:
Sieve Size Percent Passing by Weight
3/4" square 100
1/4" square 10-100
No. 10 0-50
No. 40 0-25
No. 200 0-5
The cullet shall have a 5% maximum debris level. The debris level shall be quantified using the following visual method. Approximately 200 grams of processed cullet that meets the required gradation shall be placed in a flat pan or plate. Care must be taken to avoid segregation of debris from the glass. The percent of debris shall conform with the debris level using AGI Data Sheets 15.1 and 15.2, "Comparison Chart for Estimating Percentage Composition," by the American Geological Institutes,1982. No hazardous materials shall be allowed in the cullet.
Prior to placing glass cullet as pipe backfill, the Contractor shall establish a test fill in a 3 foot wide by 20 foot long trench. The test trench may be a portion of the production trench, although there shall be no piping in the trench. Three 6-inch thick lifts of cullet shall be placed and compacted using the compaction equipment that will be used during pipe bedding installation. The test fill will be observed by the Engineer for the purposes of determining cullet compaction procedures to field-verify the nuclear probe method of quality control.
For more information about this product:
Recycled Glass Aggregate
Recycled Glass Aggregate as Pipe Bedding at the Puyallup/Kit Corner Custodial Landfill
Recycled concrete aggregate was also used as crushed stone surfacing on this project:
Recycled Concrete Aggregate
Recycled Concrete Aggregate as Crushed Stone Surfacing at the Houghton Custodial Landfill
Recycled Concrete Aggregate as Crushed Stone Surfacing at the Puyallup/Kit Corner Custodial Landfill

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Updated: June25, 1998

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