7/28/25, 10:04 PM ACI Concrete Strength Technician
ACI Concrete Strength Technician COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS
\VERIFIED ANSWERS \GRADED A+\LATEST UPDATE
2025-2026
Standard Practice for use of Unbonded Caps in
What is ASTM C1231?
determination of compressive strength of hardened
cylindrical concrete specimens
glass, machined metal, polished granite, or diabase
Capping plates can be made
of what material? (C617)
102% and 107%
(c1231) The inside diameter
of the retaining rings shall not
be less than % or greater
than % of the diameter of
the cylinder.
(13 +/- 2mm)
(c1231) Pad thickness must
be
1/16 in (2mm)
(C1231) The diameter of the
pad shall not be more than __
smaller than the inside
diameter of the retaining ring
leather shims
(C78) It is acceptable to use
only
when the gap between the
specimen surface in contact
with the blocks is not more
than .015in or .40 mm
capping or grinding, not leather shims
(C78) Gaps in excess of
.015in or .4mm shall be
eliminated only by
/ 1/1
7
,7/28/25, 10:04 PM ACI Concrete Strength Technician
(C1231) The height (cavity) of (25 +/- 3mm)
the metal retaining ring
must be
(C1231) If the retaining ring .47 in (12mm) and .35in (9mm)
is 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 .01 inches (.25mm) deep or .05in (32mm) surface area
the retaining ring must not
have gauges greater than
(C1231) For specimen ends, .2 inches (5mm) measured across any diameter using a round wire
depressions under a edge
straightedge must not
exceed
(C1231) Depressions on ends .2in (5mm)
of specimens that exceed
___ must be corrected by
sawing or grinding
Procedures for capping perpendicularity and planeness
enable concrete
cylinders and cores to meet
C617's practice requirements
for___ and___.
(C1231) Neither end of the .5
cylinder shall
depart from perpendicularity
by more than
__ degrees
(C1231) Depressions on ends sawing or grinding
of specimens that exceed
.2in (5mm) must be
corrected by ___ or ___
(C1231) Tolerance on Shore A +/- 5
durometer hardness is +/- __
(C1231) The surface of the .002 in (.05mm)
base plate that contacts the
/ 2/1
7
, 7/28/25, 10:04 PM ACI Concrete Strength Technician
bearing block must be plane
to within ___ in.
Unbonded caps can be used C31, C192, and C42
for ASTM C__, C___, and C___
After application of the .5 degrees
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.
Qualification tests on an -The design or dimensions of the retaining rings
unbonded -Pad composition or thickness
capping system must be -The Shore A hardness by more than 5 units
repeated when ever
there are changes in
_________________ (3)
/ 3/1
7
ACI Concrete Strength Technician COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS
\VERIFIED ANSWERS \GRADED A+\LATEST UPDATE
2025-2026
Standard Practice for use of Unbonded Caps in
What is ASTM C1231?
determination of compressive strength of hardened
cylindrical concrete specimens
glass, machined metal, polished granite, or diabase
Capping plates can be made
of what material? (C617)
102% and 107%
(c1231) The inside diameter
of the retaining rings shall not
be less than % or greater
than % of the diameter of
the cylinder.
(13 +/- 2mm)
(c1231) Pad thickness must
be
1/16 in (2mm)
(C1231) The diameter of the
pad shall not be more than __
smaller than the inside
diameter of the retaining ring
leather shims
(C78) It is acceptable to use
only
when the gap between the
specimen surface in contact
with the blocks is not more
than .015in or .40 mm
capping or grinding, not leather shims
(C78) Gaps in excess of
.015in or .4mm shall be
eliminated only by
/ 1/1
7
,7/28/25, 10:04 PM ACI Concrete Strength Technician
(C1231) The height (cavity) of (25 +/- 3mm)
the metal retaining ring
must be
(C1231) If the retaining ring .47 in (12mm) and .35in (9mm)
is 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 .01 inches (.25mm) deep or .05in (32mm) surface area
the retaining ring must not
have gauges greater than
(C1231) For specimen ends, .2 inches (5mm) measured across any diameter using a round wire
depressions under a edge
straightedge must not
exceed
(C1231) Depressions on ends .2in (5mm)
of specimens that exceed
___ must be corrected by
sawing or grinding
Procedures for capping perpendicularity and planeness
enable concrete
cylinders and cores to meet
C617's practice requirements
for___ and___.
(C1231) Neither end of the .5
cylinder shall
depart from perpendicularity
by more than
__ degrees
(C1231) Depressions on ends sawing or grinding
of specimens that exceed
.2in (5mm) must be
corrected by ___ or ___
(C1231) Tolerance on Shore A +/- 5
durometer hardness is +/- __
(C1231) The surface of the .002 in (.05mm)
base plate that contacts the
/ 2/1
7
, 7/28/25, 10:04 PM ACI Concrete Strength Technician
bearing block must be plane
to within ___ in.
Unbonded caps can be used C31, C192, and C42
for ASTM C__, C___, and C___
After application of the .5 degrees
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.
Qualification tests on an -The design or dimensions of the retaining rings
unbonded -Pad composition or thickness
capping system must be -The Shore A hardness by more than 5 units
repeated when ever
there are changes in
_________________ (3)
/ 3/1
7
