Procurement Procedures Can Affect Quality of Concrete

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Procurement Procedures Can Affect Quality of
Concrete
ACI Committee 123 Forum

• Samuel S. Tyson, P.E.
• April 18, 2005

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Performance-Related Specifications

• Level of quality based
  on desired performance
• Use in-situ measurements
• Provide rational basis for incentives/disincenti
  ves

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LEVEL A
Performance-Related Specifications

• Use performance models to establish pay factors
• Link between construction quality and long-term
  product performance

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Acceptance Quality Characteristics Affecting
Pavement Performance

• Smoothness
• Thickness
• Strength
• Entrained air . . .

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Acceptance Quality Characteristics

• Are measurable
• Have been found to correlate with pavement
  performance
• Are under contractors control

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Key Aspects of PRS

• Pay adjustments derived from quantified
  relationships between the key AQCs, pavement
  performance and costs

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PRS Overview
As-Designed
Performance Models
Quality
Distress IRI
As-Constructed
Designed
Pavement Age
Constructed
MR Plan
As-Designed
Pay Factors f(?LCC)
LCC
As-Constructed
Rational Contractor Pay Adjustments
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PRS Advantages

• Better link design construction
• Higher quality (through incentives)
• Testing that focuses on key quality
  characteristics that relate to long-term
  performance

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FHWA Mobile Concrete Laboratory
Dowel Location
Air Void Analysis