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STRUCTURES TEAM

Test

Proposed Limits or Requirements

Mixture Qualification (Q)

Production Test (P)

Compressive Strength, AASHTO T22

F'c, as required

DC, DE, PA,VA, WV, NY, MD

DC,DE, PA, WV, NY, MD

Slump Flow, ASTM (draft attached)

20” min, 30” max, As approved by State

DC,DE, PA,VA, WV, NY, MD

DC,DE, PA, WV, NY, MD

J-Ring, ASTM (draft attached)

Within 2” of slump flow

DC,DE, PA,VA, WV, NY(2), MD

DC,DE, PA, WV, MD

Visual Stability Index, ASTM (draft attached)

0-1, maximum

DC,DE, PA,VA, WV, NY, MD

DC,DE, PA, WV, MD

Air Content, Modified AASHTO T152

From State Specifications

DC,DE, PA,VA, WV, NY, MD

DC,DE, PA, WV, NY, MD

Column Segregation, ASTM (draft attached)

N/A, submit for approval

DC,DE, PA,VA, WV, NY, MD

DC

Rapid Chloride Permeability, AASHTO T-277

2000 coulombs maximum

DC,DE, PA,VA(1), WV, MD

DC

Freeze/Thaw, ASTM C666, Procedure B

Durability factor, 80 min.

DC,DE, PA,VA, WV, NY, MD

DC

Hardened Air Analysis, ASTM C457

4.0% min., 0.01” spacing factor, max

DC,DE, PA,VA, NY(3a), MD

DC

Other: Concrete Temperature

50-90F

DC, DE, PA, VA, WV, NY, MD

DC, DE, PA, VA, WV, NY, MD

Other: Modulus of Elasticity

 

NY

 

Other: Shrinkage

 

NY

 

Other: Scaling Resistance

 

NY

 

Other: 90-day ponding test

 

NY

 

Other: Microwave test for W/C

 

NY(3d)

NY(3f)

  • VA -- per contract specifications
  • NY -- recommended, but not required. Reviews performance/blocking during production
  • NY -- other. In general -- NY allows SCC for prestressed applications if the mix is derived from an "approved" HPC mix.
  • Air content is generally 5-9 percent, however, a producer may propose a lower range, even down to 3-7 if all other qualification tests are performed at the lowest air content.
  • NY does not perform the rapid chloride permeability test because they have found that "poor" mixtures containing dci can show "good" results. NY uses a 90-day ponding test where the chloride ion concentration of the paste is measured at selected depths (eg 25mm, 50mm).
  • NY does not perform linear traverse. Matt Royce believes their materials bureau is moving towards air structure analysis using the Air Void Analyzer. NY believes if the mixture meets the F/T and scaling tests that the air structure is adequate.
  • NY requires that during qualification testing, the trial mixture is produced at the max w/c ratio + 0.03. During production, they will permit use of concrete then when the microwave testing is at +0.03.
  • NY does permit slight vibration or rodding for scc but requires that testing be done during qualification to show the mix won"t segregate. Trial batching and testing is done at the highest "flow".
  • Microwave testing performed initially. May be discontinued if results are "on" and agree with batcher/mixer slip.

 

Shaded items : Baseline requirements….can be supplemented by contract documents

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