ACI CONCRETE FIELD TESTING TECHNICIAN GRADE 1 STUDY
GUIDE EXAM QUESTIONS AND VERIFIED ANSWERS
ASTM C31 / C31M-06
Standard Practice for Making, Curing, Protecting & Transporting Test Specimens in the
Field Conditions.
ASTM C1064 /C1064M-05
Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete
ASTM C172 -07
Standard Practice For Sampling Freshly Mixed Concrete From Different Containers
Used In The Production or Transportation 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,
nonreactive with concrete. Molds shall be watertight and hold their dimensions and
shape under all conditions of use.
Cylindrical Specimens
, 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
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
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
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
A mallet with a rubber or rawhide head weighing 1.25 + or - 0.5 lb shall be used.
GUIDE EXAM QUESTIONS AND VERIFIED ANSWERS
ASTM C31 / C31M-06
Standard Practice for Making, Curing, Protecting & Transporting Test Specimens in the
Field Conditions.
ASTM C1064 /C1064M-05
Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete
ASTM C172 -07
Standard Practice For Sampling Freshly Mixed Concrete From Different Containers
Used In The Production or Transportation 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,
nonreactive with concrete. Molds shall be watertight and hold their dimensions and
shape under all conditions of use.
Cylindrical Specimens
, 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
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
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
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
A mallet with a rubber or rawhide head weighing 1.25 + or - 0.5 lb shall be used.
