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7i%iA TZCHKICAL ADVISCRY T 5C80.17
Tuly 14, 1993
10. MANCFACTC'RED CONCRETE PRODUCTS Concrete oroducts
consist of structural elements constructed at a plant
and trucked to the jobsite. These precast products
typically consist of beans, pipes, barriers, poles and
other special elements. The criteria outlined within
this document apply to these products as well.
Additional information about prestressed products are
contained in the Checklist for Prestressed Concrete
Products in Attachment 6.
11. DUALITY CONTROL AND TESTING
a. All testing should be performed by certified
technicians. The AC1 and the National Institute
for Certification in Engineering Technologies
(NICET) administer a concrete technician
certification program. Guidance for establishing
a certification program for testing personnel
appears in a FHWA paper titled "Laboratory
Accreditation and Certification of Testing
Personnel."
b. .Process control testing should be performed on
aggregate moisture content, aggregate gradation,
air content, unit weight, and slump at the plant.
(1) The specifications should require that the
contractor provide a process control plan.
The State should also provide guidance on
minimum requirements for a process control
plan. As a minimum, the process control plan
should include the information contained in
Attachment 7.
(2) All process control tests should be plotted
on control charts. Control charts are a good
visual tool for discovering trends quickly
before major problems occur.
C. The acceptance procedures should include
monitoring of the process control activities
--.- including aggregate gradation testing. In
addition, acceptance testing at placement would
include slump, strength, and air content. Close
monitoring of the water-cement ratio is also
required since this will ultimately affect the
durability and strength of the concrete.
3.10.21
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