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ACI Concrete Field Testing Technician Grade 1 Study Guide latest updated
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ACI Concrete Field Testing Technician Grade 1 Study Guide latest updated
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ACI Concrete Field Testing Technician Grade 1 Study Guide latest updated ASTM C31 / C31M-06 - Answer- Standard Practice for Making, Curing, Protecting & Transporting Test Specimens in the Field Conditions.ASTM C1064 /C1064M-05 - Answer- Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete
ASTM C172 -07 - Answer- Standard Practice For Sampling Freshly Mixed Concrete From Different Containers Used In The Production or Transportation Of Concrete.
ASTM C143 / C143M-05a - Answer- Standard Test Method for Slump of Hydraulic-
Cement Concrete Both In Laboratory And In The Field
ASTM C138 / C138M-07 - Answer- Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete
ASTM C231 -04 - Answer- Standard Test Method for Air Content of Freshly Mixed Concrete by Pressure Method
ASTM C173 / C173M-07 - Answer- Standard Test Method For Air Content of Freshly Mixed Concrete Containing Any Type Of Aggregate, Whether It Be Dense, Cellular, or Lightweight by Volumetric Method
Molds - Answer- Mold for specimens shall be made of steel, cast iron, or other nonabsorbent material, nonreactive with concrete. Molds shall be watertight and hold their dimensions and shape under all conditions of use.
Cylindrical Specimens - Answer- Compressive or Splitting Tensile Strength Specimens shall be cylinders cast and allowed to set in an upright position. The length shall be twice the diameter (4 X 8in or 6 X 12 in). The cylinder daimeter shall be at least 3 times the nominal maximum size of the coarse aggregate. When the nominal maximum size of the coarse aggregate exceeds 2 inches the concrete sample shall be treated by wet sieving through a 2 inch sieve.
Beam Specimens - Answer- Flexural strength specimens shall be beams of concrete cast and hardened in the horizontal position. The length shall be at least 2 inch greater than three times the depth as tested. The ratio of width to depth as molded shall not exceed 1.5. The standard beam shall be 6 by 6 inches in cross section, and shall be used for concrete with nominal maximum size coarse aggregate up to 2 inches. When the nominal maximum size of the coarse aggregate exceeds 2 inches, the smaller cross
sectional dimension of the beam shall be at least three times the nominal maximum size
of the coarse aggregate. Tamping Rod - Answer- A round, straight steel rod having the tamping end or both ends
rounded to a hemispherical tip of the same diameter as the rod. Rod Dimensions are based off of the diameter of Cylinder or Width of Beam. - less than 6 inch, Rod =Diameter 3/8 inch & Length 12inch
- 6 inch, Rod = Diameter 5/8 inch & Length 20 inches
- 9 inch, Rod = Diameter 5/8 inch & Length 26 inches
[Rod tolerances length + or - 4inches and diameter + or - 1/16inch.]
Vibrators - Answer- Internal vibrators shall be used. The vibrator frequency shall be at least 9000 vibrations per minute while the vibrator is operating in the concrete. The diameter of a round vibrator shall be no more than one fourth the diameter of the cylinder mold or width of the beam mold. The combined length of the vibrator shaft and vibrating element shall exceed the depth of the section being vibrated by at least 3 inches.
Mallet - Answer- A mallet with a rubber or rawhide head weighing 1.25 + or - 0.5 lb shall
be used.
Sampling Receptacle - Answer- The receptacle shall be a suitable Heavy Gage metal pan, wheelbarrow, or flat, clean nonabsorbent board of sufficient capacity to allow easy remixing of the entire sample with a shovel or trowel.
Temperature Measureing Device - Answer- Shall be capable of accurately measuring the temperature 3 inches or more immersion of the freshly mixed concrete to plus or minus 1 degree Fahrenheit throughout the range of 30 - 120 degrees Feahrenheit. The device shall be readable and accurate to plus or minus 0.5 Feahrenheit. Verification of direct reading resistance reference temperature measuring devices shall be performed every twelve months.
ASTM C1064 Standard Test Method for Temperature Procedure - Answer- - Sample the freshly mixed concrete in accordance with Practice C172
- Position the temperature measuring device so that the end of the temperature sensing portion is submerged 3 inches and at least 3 inches of concrete cover in all directions.
- Close all voids at surface of the concrete around the temperature device.
- Leave the temperature measuring device in the concrete for at least 2 mins but no more than 5 mins.
-Then read and record to the nearest 1 degree Feahrenheit.
ASTM C172 Standard Test Method For Section 40: - Answer- - The elapsed time shall not exceed 15 mins. between obtaining the first and final portions of the composite sample. - The sample shall be combined and remixed with a shovel to ensure uniformity.
-Sample size is dictated by the maximum aggregate size and should be atleast 28 L (1cubic foot) for strength tests.
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