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[GreenYes] RE: Crushed recycled concrete
Bruce,

Here are excerpts from The 2002 State of Washington Department of
Transportation Standard Specifications for Road, Bridge and Municipal
Construction:
(You can find the book on-line at
http://www.wsdot.wa.gov/fasc/EngineeringPublications/Manuals/2002SS.pdf)

Specifically, it says:  Recycled Portland cement concrete rubble may be used
as, or blended with: ballast; shoulder ballast; crushed surfacing base and
top course; maintenance rock; gravel backfill for foundation, walls, and
pipe bedding material; gravel borrow; and foundation material.

WSDOT - 2002 Standard Specifications 

AGGREGATES 
9-03.9 Aggregates for Ballast and Crushed Surfacing 
9-03.9(3) Crushed Surfacing 
Crushed surfacing shall be manufactured from ledge rock, talus, or gravel in
accordance with the provisions of Section 3-01. The materials shall be
uniform in quality and substantially free from wood, roots, bark, and other
extraneous material and shall meet the following test requirements: 
  
Los Angeles Wear, 500 Rev 35% max. 
Degradation Factor -- Top Course 25% min. 
Degradation Factor -- Base Course 15% min. 
  
Crushed surfacing of the various classes shall meet the following
requirements for grading and quality when placed in hauling vehicles for
delivery to the roadway, or during manufacture and placement into a
temporary stockpile. The exact point of acceptance will be determined by the
Engineer. 
  
Sieve Size Base Course
Percent Passing Top Course and Keystone
Percent Passing  
1-1/4" square 100  
1" square 80-100   
3/4" square   100 
5/8" square 50-80  
1/2" square   90-100 
U.S. No. 4 25-45 46-66 
U.S. No. 40 3-18 8-24 
U.S. No. 200 7.5 max. 10.0 max. 
% Fracture 75 min. 75 min. 
Sand Equivalent 32 min. 32 min. 
All percentages are by weight. 

 
The fracture requirement shall be at least one fractured face and will apply
to material retained on each sieve size U.S. No. 10 and above if that sieve
retains more than 5 percent of the total sample. 

The portion of crushed surfacing retained on a U.S. No. 4 sieve shall not
contain more than 0.15 percent wood waste. 

  
9-03.11 Recycled Portland Cement Concrete Rubble 
Recycled Portland cement concrete rubble may be used as, or blended with:
ballast; shoulder ballast; crushed surfacing base and top course;
maintenance rock; gravel backfill for foundation, walls, and pipe bedding
material; gravel borrow; and foundation material.

A preliminary sample of the recycled concrete, and native material if any,
used for ballast, shoulder ballast, crushed surfacing base and top course,
maintenance rock, and gravel backfill for foundation Class A shall be
submitted for testing for LA Wear and Degradation Factor. In addition, the
source of any native material that may be blended with the recycled Portland
cement concrete rubble shall also meet the specifications for LA Wear and
Degradation Factor for the type aggregate being used.

A maximum of 20 percent by weight of recycled asphalt concrete pavement may
be used in the blended product. The asphalt concrete content is calculated
as the amount of asphalt particles retained on all screens U.S. No. 4 and
above. 

The recycled aggregates shall be stockpiled in such a manner that each
certified test report will identify a single stockpile of not more than
10,000 tons.

The Contractor shall certify that the recycled material is neither hazardous
or toxic. This certification shall address the toxicity characteristics
prescribed in WAC 173-303-090(8) under sampling and testing according to WAC
173-303-110.  Sampling and testing shall be one per 10,000 tons from any
single source and not less than one sample from any single source.

Acceptance of the recycled concrete rubble aggregate for hazardous and toxic
requirements shall be by Manufacturer's Certificate of Compliance with
accompanying test reports.

Gradation, sand equivalent, and fracture requirements will be per the
specific product outlined in these specifications.

----------------------------------------------------------------------

Subject: Crushed recycled concrete
From: "Maine, Bruce" <bmaine@no.address>
Date: Wed, 8 Jan 2003 15:59:27 -0600
X-Message-Number: 2

I'm looking for examples of municipal or state roadway construction =
specifications where crushed recycled concrete is specifically =
referenced for any number of applications.
Thanks in advance.
Bruce Maine
Research Director - Sustainable Design Services
LEED Accredited Professional
Nebraska State Recycling Association
HDR=20
402.399.1198
bmaine@no.address
http://www.hdrinc.com/sustainable/






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