• Two people performing this test should have results that differ by no more than 1.9ºF

(Not a rebar)

• Two people performing this test can have results that vary from 0.82 to 1.5 inches

• Two people performing this test using a type A meter can have results that differ by 0.8%

Source # Name Beds

A09006 Tripoli Platte 1-5

A10010 Hazelton 4

A10030 S. Aurora 1-3

A16006 Stonemill 4

A23004 Behr 1-2

A23006 Shaffton 16-17

A42002 Alden 0-3, 3

A44006 Leeper 8-11

A45008 Dotzler 7-10A

A49020 Preston 7-10

A49024 Maquoketa 1-8

A50002 Sully Mine 36-41

A52004 Conklin 23-24

A52006 Klein 23-24

A53002 Behrends 1-5

A53010 Ballou-Olin 3, 2-3

A53016 Stone City 2B-3

A54002 Keswick 13-15

A57008 Bowser-Springville 6-7, 8-9

A57018 Cedar Rapids 2-9

A57028 Beverly 6-7

A58002 Columbus Junction 16-19

A63002 Durham 101

A82002 McCausland 17-19, 1-16

A89002 Douds Mine 6-13

A92002 Westchester 14-16

Iowa DOT IM 318

NOTE: The following is a list of aggregate sources, includingbed numbers, that will typically need an aggregatecorrection factor applied. When these aggregates are usedwithout an aggregate correction factor applied, excessivebleeding is commonly noted, especially on bridge decks.There is a fairly good correlation of aggregate sources withan Iowa Pore Index primary load greater than 100 mayrequire an aggregate correction factor. Contact the DistrictMaterials Engineer when using these aggregates.

• Ready Mix Producer – at the point of discharge• What is the point of discharge?

R – C + Wwhere:A = air content, %

R = final meter reading, %C = Correction factor based from Table 1, 5, andW = number of calibrated cups of water added to the meter

• Two people performing this test should have results that differ by no more than 32% of their average air content

(Think about that statement….your head will hurt)

Table 1 - Correction for the Effect of Isopropyl Alcohol on ASTM C173 Air Meter Reading

70% Isopropyl Alcohol Used

Pints Fluid Ounces Correction, %

≤ 2.0 ≤ 32 0.0

3.0 48 0.25

4.0 64 0.50

5.0 80 0.75

• For larger aggregate use the appropriate size container per the standard (sizes between 0.4 to 3.5 cu. ft. for 1 ½ to 6 inch nominal maximum aggregate)

• If rodding larger aggregate, rod each layer 25 strokes for a measure 0.5 cu. ft. or less, 50 strokes for 1 cu. ft., or one stroke for 3 sq. in. for larger measures. Tapping 10 to 15 times per layer.

• Two people performing this test should have results that differ by no more than 2.31 lb./ft3

Test Specimen Molding Requirements

Specimen Type

Specimen Size

Rodding Vibration

Number of Layers of Approximately Equal Depth

Number ofRoddingsPer Layer

Rod Size Number of Layers of Approximately Equal Depth

Number ofVibration Insertions Per Layer

Cylinders

4 inch diameter x 8

inch

2

25

3/8 inch diameter with

round hemispherical

tip

1 1

6 inch diameter x 12

inch

3

5/8 inch diameter with

round hemispherical

tip

2 2

Beams6 inch x 6 inch

x 20 inch2

60(1 rod per 2

sq. in. of surface)

1

Dependent on

Consistencyof Concrete

smallicoat@iowareadymix.org