update on the sam and the box test...step 2 (30 psi) (14.5 psi) step 3 (45 psi) sam modifications...
TRANSCRIPT
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Update on the SAM and the Box Test
Tyler Ley
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Outline
1. Super Air Meter2. The Box Test
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digital gauge
Six clamps!
different bleeder valve
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AASHTO Test Method
• The SAM is now an AASHTO provisional test method!
• AASHTO TP 118
• Thanks to the help of Larry Sutter of Michigan Tech, Mic Syslo, and Wally Heyen of Nebraska Department of Roads
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Controlled Air Pressure Extenderaka CAPE
Compressed air
Step 1(14.5 psi)Step 2 (30 psi)
Step 3 (45 psi)
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SAM modifications
• The SAM can be completed in 8-10 minutes with the air pump
• If you use the CAPE then it can be completed in 4-6 minutes
• An all metal body gauge is under development
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The following states have a SAM
• Michigan (5)• Kansas (6)• Utah• Colorado (2)• Iowa (2)• Illinois (5)• Indiana (2)• Wisconsin (4)• Massachusetts• Idaho (2)• Tennessee
• Pennsylvania• Missouri (2)• N. Carolina (3)• N. Dakota• Oklahoma (9)• Nebraska (3)• Ohio (3)• Minnesota (2)• Texas (2)• FHWA (4)
• Georgia• New Jersey• New York• South Dakota• Mississippi• Iowa (2)• Manitoba (3)• Ontario (2)
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What have we done in the lab?
• Completed 220 laboratory testing for typical pavement and bridge deck concrete
• Investigated w/cm from 0.35 to 0.53
• Different AEAs, admixture combinations, with and with out fly ash, different temperatures
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94% agreement
SAM vs spacing factor
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89% agreement
SAM vs specific surface
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80% agreement w/ 0.20 limit89% agreement w/ 0.25 limit
SAM vs rapid freeze thaw
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69% agreement
Spacing factor vs rapid freeze thaw
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Discussion
• A SAM number of 0.20 shows 94% agreement with laboratory spacing factor limit of 0.008”
• The same limit shows 89% agreement with specific surface limit of 600 in-1
• For the freeze thaw data there is better agreement for a SAM number of 0.25 (89%) then for a SAM number of 0.20 (80%)
• The SAM number had a better correlation with freeze thaw results then the spacing factor
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What have we done in the field?
• Visited eight field sites in Oklahoma and sampled 60 different mixtures
• Gathered 90 field mixtures from Colorado, Utah, Nebraska, Minnesota, N. Dakota, Iowa, FHWA– 30% bridges, 67% pavements, 3% other
• We have another 50 mixes from Michigan and FHWA mobile concrete lab that will be added soon
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70% agreement w/ 0.20 limit84% agreement w/ 0.25 limit
SAM vs spacing factor
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Discussion
• A SAM limit of 0.25 shows 84% agreement while the SAM limit of 0.20 shows 70% agreement
• The field data is more variable then the lab data
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How do we choose a SAM limit?
• We run fresh and hardened air tests as a surrogate for freeze thaw durability.
• This suggests that we should choose a SAM limit based on the freeze thaw testing
• While a SAM limit of 0.25 may be a better predictor of freeze thaw performance, a limit of 0.20 is conservative.
• Maybe we use the 0.20 as an accept limit and the 0.25 as an action limit?
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Proposed SAM limit
• If SAM number is less than 0.20 then accept the concrete
• If SAM number is between 0.20 and 0.25 then request the air be increased on the next load
• If the SAM number is greater than 0.25 then there is concern about freeze thaw durability
• Total air content must be above 5%
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How can this group help?• Get a SAM and start using it• Share your data and send a cylinder and
we will do hardened air-void analysis• We will make all of the data public• If you have already promised me data then
provide it!
www.superairmeter.com
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Other Work
• We are holding a SAM robin at Oklahoma State this winter.
• All experienced SAM users are invited!• We will check calibration of meters and have
operators pass a proficiency exam• We will have ready mix concrete brought into
our lab and everyone will sample at the same time.
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• A simple test that examines:– Response to vibration – Filling ability of the grout (avoid internal voids)– Ability of the slip formed concrete to hold a
sharp edge (cohesiveness)
• The slump test can not tell us this!
The Box Test
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12”
12”
12”
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Box Test
• Add 9.5” of unconsolidated concrete to the box
• A 1” diameter stinger vibrator is inserted into the center of the box over a three count and then removed over a three count
• The edges of the box are then removed and inspected for honey combing or edge slumping
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Box Test Ranking Scale
4 3
Over 50% overall surface voids. 30-50% overall surface voids.
2 1
10-30% overall surface voids. Less than 10% overall surface voids.
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Visual Ranking
• Instead of just eyeballing the amount of surface voids we have started using a more systematic procedure.
• You use plexi glass with circles printed on it and hold it up to the surface and examine each circle to see if there is a void.
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Visual Ranking
• By counting the dots where there are voids then you can quickly estimate the amount of surface voids.
• This is like doing a point count on a hardened air sample.
• We are still perfecting the technique.
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28 dots total8 dots with voids8/28 = 28% voids
Red circles = voidOrange circles = mortar
This takes about 30 seconds per side
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www.optimizedgraded.com
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What’s Next?
• Finalize the details of the point count to estimate the surface voids
• Eleven states have been given a Box Test and vibrators to try out
• We have a new YouTube video on how to run the box test.
• Develop an AASHTO Provisional Test Method!!!!
www.optimizedgraded.com