ACI CONCRETE STRENGTH TESTING
TECHNICIAN EXAM PREP QUESTIONS AND
ANSWERS 2026 PRACTICE SOLUTION
VERIFIED RESULTS
◉ (C1231) If the retaining ring is greater than 4in (100mm) it must
be at least __ thick. If it is less than 4in, it must be at least __ thick.
Answer: .47 in (12mm) and .35in (9mm)
◉ (C1231) Bearing surfaces of the retaining ring must not have
gauges greater than
Answer: .01 inches (.25mm) deep or .05in (32mm) surface area
◉ (C1231) For specimen ends, depressions under a straightedge
must not exceed
Answer: .2 inches (5mm) measured across any diameter using a
round wire edge
◉ (C1231) Depressions on ends of specimens that exceed ___ must
be corrected by sawing or grinding
Answer: .2in (5mm)
,◉ Procedures for capping enable concrete cylinders and cores to
meet C617's practice requirements for___ and___.
Answer: perpendicularity and planeness
◉ Capping plates can be made of what material? (C617)
Answer: glass, machined metal, polished granite, or diabase
◉ (c1231) The inside diameter of the retaining rings shall not be
less than _____% or greater than _____% of the diameter of the
cylinder.
Answer: 102% and 107%
◉ (c1231) Pad thickness must be
Answer: (13 +/- 2mm)
◉ (C1231) The diameter of the pad shall not be more than __ smaller
than the inside diameter of the retaining ring
Answer: 1/16 in (2mm)
◉ (C1231) Neither end of the cylinder shall depart from
perpendicularity by more than __ degrees
Answer: .5
, ◉ (C1231) Depressions on ends of specimens that exceed .2in
(5mm) must be corrected by ___ or ___
Answer: sawing or grinding
◉ (C1231) Tolerance on Shore A durometer hardness is +/- __
Answer: +/- 5
◉ (C1231) The surface of the base plate that contacts the bearing
block must be plane to within ___ in.
Answer: .002 in (.05mm)
◉ Unbonded caps can be used for ASTM C__, C___, and C___
Answer: C31, C192, and C42
◉ After application of the load, but before reaching 10% of the
anticipated specimen strength, check to see that the axis of the
cylinder does not depart from vertical by more than _____ degrees.
Answer: .5 degrees
◉ Qualification tests on an unbonded capping system must be
repeated when ever there are changes in _____ (3)
Answer: -The design or dimensions of the retaining rings
-Pad composition or thickness
TECHNICIAN EXAM PREP QUESTIONS AND
ANSWERS 2026 PRACTICE SOLUTION
VERIFIED RESULTS
◉ (C1231) If the retaining ring is greater than 4in (100mm) it must
be at least __ thick. If it is less than 4in, it must be at least __ thick.
Answer: .47 in (12mm) and .35in (9mm)
◉ (C1231) Bearing surfaces of the retaining ring must not have
gauges greater than
Answer: .01 inches (.25mm) deep or .05in (32mm) surface area
◉ (C1231) For specimen ends, depressions under a straightedge
must not exceed
Answer: .2 inches (5mm) measured across any diameter using a
round wire edge
◉ (C1231) Depressions on ends of specimens that exceed ___ must
be corrected by sawing or grinding
Answer: .2in (5mm)
,◉ Procedures for capping enable concrete cylinders and cores to
meet C617's practice requirements for___ and___.
Answer: perpendicularity and planeness
◉ Capping plates can be made of what material? (C617)
Answer: glass, machined metal, polished granite, or diabase
◉ (c1231) The inside diameter of the retaining rings shall not be
less than _____% or greater than _____% of the diameter of the
cylinder.
Answer: 102% and 107%
◉ (c1231) Pad thickness must be
Answer: (13 +/- 2mm)
◉ (C1231) The diameter of the pad shall not be more than __ smaller
than the inside diameter of the retaining ring
Answer: 1/16 in (2mm)
◉ (C1231) Neither end of the cylinder shall depart from
perpendicularity by more than __ degrees
Answer: .5
, ◉ (C1231) Depressions on ends of specimens that exceed .2in
(5mm) must be corrected by ___ or ___
Answer: sawing or grinding
◉ (C1231) Tolerance on Shore A durometer hardness is +/- __
Answer: +/- 5
◉ (C1231) The surface of the base plate that contacts the bearing
block must be plane to within ___ in.
Answer: .002 in (.05mm)
◉ Unbonded caps can be used for ASTM C__, C___, and C___
Answer: C31, C192, and C42
◉ After application of the load, but before reaching 10% of the
anticipated specimen strength, check to see that the axis of the
cylinder does not depart from vertical by more than _____ degrees.
Answer: .5 degrees
◉ Qualification tests on an unbonded capping system must be
repeated when ever there are changes in _____ (3)
Answer: -The design or dimensions of the retaining rings
-Pad composition or thickness
