ACI Concrete Field Testing Technician Grade 1 Stud
ACI Concrete Field Testing Technician Grade 1 Stud
ACI Concrete Field Testing Technician Grade 1 Stud
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ACI Concrete Field Testing Technician Grade 1 Study Guide
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ACI Concrete Field Testing Technician Grade 1 Stud
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ACI Concrete Field Testing Technician Grade 1 Stud
ACI Concrete Field Testing Technician Grade 1 Study Guide
ASTM C31 / C31M-06 outlines the standard practice for making, curing, protecting, and transporting test
specimens in field conditions.
ASTM C1064 / C1064M-05 describes the standard test method for measuring the temperature of freshly
...
aci concrete field testing technician grade 1 stud
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ACI Concrete Field Testing Technician Grade 1 Stud
ACI Concrete Field Testing Technician Grade 1 Stud
ACI Concrete Field Testing Technician Grade 1 Stud
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ACI Concrete Field Testing Technician Grade 1 Study Guide
ASTM C31 / C31M-06 outlines the standard practice for making, curing, protecting, and transporting test
specimens in field conditions.
ASTM C1064 / C1064M-05 describes the standard test method for measuring the temperature of freshly
mixed hydraulic-cement concrete.
ASTM C172 -07 establishes the standard practice for sampling freshly mixed concrete from various
containers used in its production or transportation.
ASTM C143 / C143M-05a provides the standard test method for determining the slump of hydraulic-
cement concrete in both laboratory and field environments.
ASTM C138 / C138M-07 sets the standard test method for measuring the density (unit weight), yield,
and air content (gravimetric) of concrete.
ASTM C231 -04 specifies the standard test method for assessing the air content of freshly mixed
concrete using the pressure method.
ASTM C173 / C173M-07 outlines the standard test method for evaluating the air content of freshly
mixed concrete with any type of aggregate, whether dense, cellular, or lightweight, by employing the
volumetric method.
Molds
Molds used for producing concrete specimens should be made from steel, cast iron, or other
nonabsorbent materials that do not react with concrete. They must be watertight and retain their
dimensions and shape under all usage conditions.
Cylindrical Specimens
, Specimens for compressive or splitting tensile strength testing need to be cylinders that are cast and
allowed to set vertically. The length should be double that of the diameter, with dimensions such as 4 by
8 inches or 6 by 12 inches. The cylinder's diameter must be at least three times the nominal maximum
size of the coarse aggregate. If the nominal maximum size of the coarse aggregate exceeds two inches,
the concrete sample should be processed by wet sieving through a two-inch sieve.
Beam Specimens
Flexural strength specimens must be beams of concrete that are cast and hardened in a horizontal
position. The length of these beams should be at least two inches greater than three times the depth
being tested. The ratio of width to depth during molding should not exceed 1.5. The standard beam
dimensions should be 6 by 6 inches in cross-section, suitable for concrete with a nominal maximum
coarse aggregate size of up to two inches. When the maximum size exceeds two inches, the smaller
cross-sectional dimension of the beam should be at least three times the nominal maximum size of the
coarse aggregate.
Tamping Rod
The tamping rod should be a round, straight steel rod with a hemispherical tip at one or both ends,
matching the rod's diameter. The dimensions depend on the diameter of the cylinder or the width of the
beam. For cylinders or beams less than six inches in diameter, the rod should be 3/8 inch in diameter
and 12 inches long. For six-inch cylinders, the rod should be 5/8 inch in diameter and 20 inches long, and
for nine-inch cylinders, the same diameter but 26 inches long. Tolerances for the rod's length should be
plus or minus four inches, and for the diameter, plus or minus 1/16 inch.
Vibrators
Internal vibrators are recommended for use. The vibrator should operate at a frequency of at least 9,000
vibrations per minute while it is in the concrete. The diameter of a round vibrator must not exceed one-
fourth the diameter of the cylinder mold or the width of the beam mold. Additionally, the combined
length of the vibrator shaft and the vibrating element should extend at least three inches beyond the
depth of the section being vibrated.
Mallet
A mallet with a rubber or rawhide head, weighing between 1.25 and 0.5 pounds, should be used for
concrete testing purposes.
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