ACI - Concrete Strength
Technician EXAM STUDY GUIDE
2025/2026 COMPLETE QUESTIONS
WITH VERIFIED CORRECT ANSWERS ||
100% GUARANTEED PASS
<NEWEST VERSION>
1. Standard Practice for Capping Cylindrical Concrete Specimens - ANSWER
✔ ASTM C617
2. Procedures for capping enable concrete cylinders and cores to meet C617's
practice requirements for___ and___. - ANSWER ✔ Perpendicularity,
Planeness
3. ___ can be made of glass, machined metal, polished granite, or diabase.
(C617) - ANSWER ✔ Capping plates
4. Sulfur caps can be formed against ___ or___ plates. - ANSWER ✔ Metal,
stone
5. The working surface of a capping plate shall not depart from plane by more
than___ mm. - ANSWER ✔ 0.05
6. Device used in conjunction with a capping plate to ensure perpendicularity. -
ANSWER ✔ Alignment device
,7. Perpendicularity requirement of the axis of a cylindrical specimen. (degrees)
- ANSWER ✔ 0.5
8. The element of a melting pot that ensures against accidents during reheating
of cooled sulfur. - ANSWER ✔ Peripheral Heating
9. C1231 can be used instead of the capping requirements of what practice? -
ANSWER ✔ ASTM C617
10.T/F The pads provide a uniform distribution of load from the bearing blocks
of the testing machine by deforming in initial loading to conform to the
contour of the ends of the cylinder. - ANSWER ✔ True
11.When qualifying unbonded caps, strengths below ___ of the average
obtained from bonded caps is considered unacceptable. - ANSWER ✔ 98%
12.T/F C1231 contains step-by-step procedures for aligning the specimens in
the testing machine through initial loading. - ANSWER ✔ True
13.The diameter of the pads shall not be more than ___ in. smaller than the
inside diameter of the retaining ring. - ANSWER ✔ 1/16
14.Standard test method for compressive strength of cylindrical concrete
specimens. - ANSWER ✔ ASTM C39
15.C39 is limited to concrete have a density in excess of ___. - ANSWER ✔ 50
lb/ft^3
,16.How do you calculate the compressive strength according to C39? -
ANSWER ✔ Load/Area
17.Verification of the testing machine is required within __ months of the last
calibration.(C39) - ANSWER ✔ 13
18.How must the machine apply the load in C39? - ANSWER ✔ Continuously
19.The percentage of error for the loads shall not exceed ___% of the indicated
loads.(C39) - ANSWER ✔ 1
20.___ steel bearing blocks shall be on the machine. (#)(C39) - ANSWER ✔ 2
21.A ___ seated block and ___solid block shall be on the machine.(C39) -
ANSWER ✔ Spherically, solid
22.Bearing faces shall be at least___ % greater than the diameter of the
specimen.(C39) - ANSWER ✔ 3
, 24.What is ASTM C39? - ANSWER ✔ Standard Test Method for Compressive
strength of cylindrical concrete specimens
25.(C39) Compressive strength should be expressed to the nearest ___psi -
ANSWER ✔ 10 psi (.1 mPA)
26.(C39) A correction factor is needed if the length to diameter ratio is ___ or
less - ANSWER ✔ 1.75 or less
27.(C39) A 28 day old specimen must be tested within how many hours of this
age? - ANSWER ✔ 20 hours
28.(C39) The percent of error for loads should not exceed what percent? -
ANSWER ✔ +/- 1%
29.What ASTM standard describes the apparatus, materials, and procedures for
capping freshly molded concrete cylinders with neat cement? - ANSWER ✔
ASTM C617
30.(C617) Plate size for capping must exceed the diameter of the test specimen
by __in - ANSWER ✔ 1 inch (25mm)
31.(c617) Guide bars and bullseyes are used to ensure that no single cap departs
from perpendicularity to the axis by more than how many degrees -
ANSWER ✔ .5 degrees
Technician EXAM STUDY GUIDE
2025/2026 COMPLETE QUESTIONS
WITH VERIFIED CORRECT ANSWERS ||
100% GUARANTEED PASS
<NEWEST VERSION>
1. Standard Practice for Capping Cylindrical Concrete Specimens - ANSWER
✔ ASTM C617
2. Procedures for capping enable concrete cylinders and cores to meet C617's
practice requirements for___ and___. - ANSWER ✔ Perpendicularity,
Planeness
3. ___ can be made of glass, machined metal, polished granite, or diabase.
(C617) - ANSWER ✔ Capping plates
4. Sulfur caps can be formed against ___ or___ plates. - ANSWER ✔ Metal,
stone
5. The working surface of a capping plate shall not depart from plane by more
than___ mm. - ANSWER ✔ 0.05
6. Device used in conjunction with a capping plate to ensure perpendicularity. -
ANSWER ✔ Alignment device
,7. Perpendicularity requirement of the axis of a cylindrical specimen. (degrees)
- ANSWER ✔ 0.5
8. The element of a melting pot that ensures against accidents during reheating
of cooled sulfur. - ANSWER ✔ Peripheral Heating
9. C1231 can be used instead of the capping requirements of what practice? -
ANSWER ✔ ASTM C617
10.T/F The pads provide a uniform distribution of load from the bearing blocks
of the testing machine by deforming in initial loading to conform to the
contour of the ends of the cylinder. - ANSWER ✔ True
11.When qualifying unbonded caps, strengths below ___ of the average
obtained from bonded caps is considered unacceptable. - ANSWER ✔ 98%
12.T/F C1231 contains step-by-step procedures for aligning the specimens in
the testing machine through initial loading. - ANSWER ✔ True
13.The diameter of the pads shall not be more than ___ in. smaller than the
inside diameter of the retaining ring. - ANSWER ✔ 1/16
14.Standard test method for compressive strength of cylindrical concrete
specimens. - ANSWER ✔ ASTM C39
15.C39 is limited to concrete have a density in excess of ___. - ANSWER ✔ 50
lb/ft^3
,16.How do you calculate the compressive strength according to C39? -
ANSWER ✔ Load/Area
17.Verification of the testing machine is required within __ months of the last
calibration.(C39) - ANSWER ✔ 13
18.How must the machine apply the load in C39? - ANSWER ✔ Continuously
19.The percentage of error for the loads shall not exceed ___% of the indicated
loads.(C39) - ANSWER ✔ 1
20.___ steel bearing blocks shall be on the machine. (#)(C39) - ANSWER ✔ 2
21.A ___ seated block and ___solid block shall be on the machine.(C39) -
ANSWER ✔ Spherically, solid
22.Bearing faces shall be at least___ % greater than the diameter of the
specimen.(C39) - ANSWER ✔ 3
, 24.What is ASTM C39? - ANSWER ✔ Standard Test Method for Compressive
strength of cylindrical concrete specimens
25.(C39) Compressive strength should be expressed to the nearest ___psi -
ANSWER ✔ 10 psi (.1 mPA)
26.(C39) A correction factor is needed if the length to diameter ratio is ___ or
less - ANSWER ✔ 1.75 or less
27.(C39) A 28 day old specimen must be tested within how many hours of this
age? - ANSWER ✔ 20 hours
28.(C39) The percent of error for loads should not exceed what percent? -
ANSWER ✔ +/- 1%
29.What ASTM standard describes the apparatus, materials, and procedures for
capping freshly molded concrete cylinders with neat cement? - ANSWER ✔
ASTM C617
30.(C617) Plate size for capping must exceed the diameter of the test specimen
by __in - ANSWER ✔ 1 inch (25mm)
31.(c617) Guide bars and bullseyes are used to ensure that no single cap departs
from perpendicularity to the axis by more than how many degrees -
ANSWER ✔ .5 degrees
