ACI Concrete Field Tes ng Technician Grade 1 Study
Guide Ques ons and answers | Updated RATED A+ |
NEW 2026
ASTM C31 / C31M-06
Standard Prac ce for Making, Curing, Protec ng & Transpor ng Test Specimens in the Field
Condi ons.
ASTM C1064 /C1064M-05
Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete
ASTM C172 -07
Standard Prac ce For Sampling Freshly Mixed Concrete From Different Containers Used In The
Produc on or Transporta on Of Concrete.
ASTM C143 / C143M-05a
Standard Test Method for Slump of Hydraulic-Cement Concrete Both In Laboratory And In The
Field
ASTM C138 / C138M-07
Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of
Concrete
ASTM C231 -04
Standard Test Method for Air Content of Freshly Mixed Concrete by Pressure Method
ASTM C173 / C173M-07
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
Mold for specimens shall be made of steel, cast iron, or other nonabsorbent material,
nonreac ve with concrete. Molds shall be water ght and hold their dimensions and shape
under all condi ons of use.
, Cylindrical Specimens
Compressive or Spli=ng Tensile Strength Specimens shall be cylinders cast and allowed to set in
an upright posi on. The length shall be twice the diameter (4 X 8in or 6 X 12 in). The cylinder
daimeter shall be at least 3 mes 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
Flexural strength specimens shall be beams of concrete cast and hardened in the horizontal
posi on. The length shall be at least 2 inch greater than three mes the depth as tested. The
ra o of width to depth as molded shall not exceed 1.5. The standard beam shall be 6 by 6
inches in cross sec on, 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 sec onal dimension of the beam shall be at least three mes the
nominal maximum size of the coarse aggregate.
Tamping Rod
A round, straight steel rod having the tamping end or both ends rounded to a hemispherical p
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
Internal vibrators shall be used. The vibrator frequency shall be at least 9000 vibra ons per
minute while the vibrator is opera ng 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 shaG and vibra ng element shall exceed the depth of the
sec on being vibrated by at least 3 inches.
Mallet
A mallet with a rubber or rawhide head weighing 1.25 + or - 0.5 lb shall be used.
Sampling Receptacle
Guide Ques ons and answers | Updated RATED A+ |
NEW 2026
ASTM C31 / C31M-06
Standard Prac ce for Making, Curing, Protec ng & Transpor ng Test Specimens in the Field
Condi ons.
ASTM C1064 /C1064M-05
Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete
ASTM C172 -07
Standard Prac ce For Sampling Freshly Mixed Concrete From Different Containers Used In The
Produc on or Transporta on Of Concrete.
ASTM C143 / C143M-05a
Standard Test Method for Slump of Hydraulic-Cement Concrete Both In Laboratory And In The
Field
ASTM C138 / C138M-07
Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of
Concrete
ASTM C231 -04
Standard Test Method for Air Content of Freshly Mixed Concrete by Pressure Method
ASTM C173 / C173M-07
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
Mold for specimens shall be made of steel, cast iron, or other nonabsorbent material,
nonreac ve with concrete. Molds shall be water ght and hold their dimensions and shape
under all condi ons of use.
, Cylindrical Specimens
Compressive or Spli=ng Tensile Strength Specimens shall be cylinders cast and allowed to set in
an upright posi on. The length shall be twice the diameter (4 X 8in or 6 X 12 in). The cylinder
daimeter shall be at least 3 mes 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
Flexural strength specimens shall be beams of concrete cast and hardened in the horizontal
posi on. The length shall be at least 2 inch greater than three mes the depth as tested. The
ra o of width to depth as molded shall not exceed 1.5. The standard beam shall be 6 by 6
inches in cross sec on, 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 sec onal dimension of the beam shall be at least three mes the
nominal maximum size of the coarse aggregate.
Tamping Rod
A round, straight steel rod having the tamping end or both ends rounded to a hemispherical p
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
Internal vibrators shall be used. The vibrator frequency shall be at least 9000 vibra ons per
minute while the vibrator is opera ng 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 shaG and vibra ng element shall exceed the depth of the
sec on being vibrated by at least 3 inches.
Mallet
A mallet with a rubber or rawhide head weighing 1.25 + or - 0.5 lb shall be used.
Sampling Receptacle
