ACI Concrete Strength Technician EXAM COVERAGE
ACI - Concrete Strength Technician
Concrete fundamentals: types, workability,
water-cement ratio, setting times
Sampling: proper collection methods,
equipment, documentation
Specimen preparation: molding cylinders,
beams, cubes
Curing: correct methods, handling, labeling
Testing methods:
Compressive strength (cylinders, cubes)
Flexural strength (beams)
Testing machine use and calibration
Data recording and reporting per ACI standards
Identifying errors, retesting procedures
Safety: PPE, lab and field protocols
Quality control: compliance with ASTM/ACI
standards, reproducibility and reliability
(C1231) The height (cavity) of the (25 +/- 3mm)
metal retaining ring must be
,(C1231) If the retaining ring is .47 in (12mm) and .35in (9mm)
greater than 4in (100mm) it must be
at least __ thick. If it is less than 4in,
it must be at least __ thick.
(C1231) Bearing surfaces of the .01 inches (.25mm) deep or .05in (32mm) surface
retaining ring must not have area
gauges greater than
What is ASTM C1231? Standard Practice for use of Unbonded Caps in
determination of compressive strength of
hardened cylindrical concrete specimens
(C1231) For specimen ends, .2 inches (5mm) measured across any diameter
depressions under a straightedge using a round wire edge
must not exceed
(C1231) Depressions on ends of .2in (5mm)
specimens that exceed ___ must be
corrected by sawing or grinding
Procedures for capping enable perpendicularity and planeness
concrete cylinders and cores to
meet C617's practice requirements
for___ and___.
, Capping plates can be made of glass, machined metal, polished granite, or
what material? (C617) diabase
(c1231) The inside diameter of the 102% and 107%
retaining rings shall not be less
than _____% or greater than _____% of
the diameter of the cylinder.
(c1231) Pad thickness must be (13 +/- 2mm)
(C1231) The diameter of the pad 1/16 in (2mm)
shall not be more than __ smaller
than the inside diameter of the
retaining ring
(C1231) Neither end of the cylinder .5
shall depart from perpendicularity
by more than __ degrees
(C1231) Depressions on ends of sawing or grinding
specimens that exceed .2in (5mm)
must be corrected by ___ or ___
(C1231) Tolerance on Shore A +/- 5
durometer hardness is +/- __
ACI - Concrete Strength Technician
Concrete fundamentals: types, workability,
water-cement ratio, setting times
Sampling: proper collection methods,
equipment, documentation
Specimen preparation: molding cylinders,
beams, cubes
Curing: correct methods, handling, labeling
Testing methods:
Compressive strength (cylinders, cubes)
Flexural strength (beams)
Testing machine use and calibration
Data recording and reporting per ACI standards
Identifying errors, retesting procedures
Safety: PPE, lab and field protocols
Quality control: compliance with ASTM/ACI
standards, reproducibility and reliability
(C1231) The height (cavity) of the (25 +/- 3mm)
metal retaining ring must be
,(C1231) If the retaining ring is .47 in (12mm) and .35in (9mm)
greater than 4in (100mm) it must be
at least __ thick. If it is less than 4in,
it must be at least __ thick.
(C1231) Bearing surfaces of the .01 inches (.25mm) deep or .05in (32mm) surface
retaining ring must not have area
gauges greater than
What is ASTM C1231? Standard Practice for use of Unbonded Caps in
determination of compressive strength of
hardened cylindrical concrete specimens
(C1231) For specimen ends, .2 inches (5mm) measured across any diameter
depressions under a straightedge using a round wire edge
must not exceed
(C1231) Depressions on ends of .2in (5mm)
specimens that exceed ___ must be
corrected by sawing or grinding
Procedures for capping enable perpendicularity and planeness
concrete cylinders and cores to
meet C617's practice requirements
for___ and___.
, Capping plates can be made of glass, machined metal, polished granite, or
what material? (C617) diabase
(c1231) The inside diameter of the 102% and 107%
retaining rings shall not be less
than _____% or greater than _____% of
the diameter of the cylinder.
(c1231) Pad thickness must be (13 +/- 2mm)
(C1231) The diameter of the pad 1/16 in (2mm)
shall not be more than __ smaller
than the inside diameter of the
retaining ring
(C1231) Neither end of the cylinder .5
shall depart from perpendicularity
by more than __ degrees
(C1231) Depressions on ends of sawing or grinding
specimens that exceed .2in (5mm)
must be corrected by ___ or ___
(C1231) Tolerance on Shore A +/- 5
durometer hardness is +/- __
