ACI STRENGTH EXAM STUDY GUIDE
QUESTIONS WITH CORRECT ANSWERS 2025
Name the two allowable materials with with concrete cylinders may be capped with. -
CORRECT ANSWER -I. High-strength gypsum
II. Sulfur mortar
III. Neat cement paste
Name the three materials with with cylinders may be capped against. - CORRECT ANSWER -I. Glass
II. Metal
III. Granite
Prior to beginning the capping procedure, what must the metal plate be inspected for? -
CORRECT ANSWER -I. Grooves
II. Gouches
III. Indentations
What is the maximum allowable size of any indentation on the base plate? - CORRECT ANSWER -
0.010 in [0.25 mm]
Upon receipt of the capingAmaterial, for how long can it be kept in intervals? - CORRECT ANSWER -
3 months
When must the neat cement paste be applied it to the cylinder? - CORRECT ANSWER -Immediately
For how long must the concrete settle in the mold prior to applying the neat cement paste? -
CORRECT ANSWER -2 to 4 hours
Prior to capping, name the three tasks that must be performed on the cylinder. - CORRECT ANSWER -
I. Inspect for any bumps greater than 1/8"
II. Remove foreign debris.
III. Remove any excess water or laitence.
,What is the required position of the concrete cylinder? - CORRECT ANSWER -90° ± 0.5°
Name the required temperature range of the heated sulfar mortar mixture. - CORRECT ANSWER -
265°F to 290 °F [130 °C to 145 °C]
What is the maximum number of times that the heated sulfur may be used per cylinder capping proced
ure? - CORRECT ANSWER -5 times
These procedures for capping enable concrete cylinders and cores to meet the standard practice's requi
rements for and . - CORRECT ANSWER -perpendicularity ... planeness ... perpendicularity
Equipment needed for the capping process includes capping devices and pots. -
CORRECT ANSWER -plates ... alignment ... melting
Plates for neat cement and high-
strength gypsum plaster caps should be made of , , or . - CORRECT ANSWER -
metal ... glass ..... granite
Sulfar mortar cap plates should be formed against or plates. - CORRECT ANSWER -
marble .... stone
True or false? The purpose of the guide bar or bull's eye level is to ensure that caps remain perpendicul
ar to the axi of the cylinder within 0.5 degrees. - CORRECT ANSWER -True
To avoid accidents during reheating of cooled sulfur, use melting pots that have .-
CORRECT ANSWER -Metal covers
The technician should use a stiff layer of to cap fresh concrete cylinders. - CORRECT ANSWER -
Burlap
Hardened concrete cylinders should be capped with , , or .-
CORRECT ANSWER -cement paste ... gypsum ..... mortar sulfur
, True Lor Lfalse? LPlasters Lof Lparis Land Lmixtures Lof Lplaster Lof Lparis Land Lportland Lare Lexamples Lof
Lsuitable Lhi Lgh-strength Lplasters. L- LCORRECT LANSWER L-True
Sulfar Lmortars Land Lhigh-
strength Lgypsum Lcement Lcubes Lmust Ldemonstrate La Lminimum Lcompressive Lstrength Lof L or L ,
Lwhichever Lis Lgreater. L- LCORRECT LANSWER L-5000 Lpsi
The Lcement Lpaste Lshould Lbe Lapplied Lto Lthe Lfreshly Lmolded Lcylinder Lfrom L hours Lafter Lmolding.
LThi Ls Lis Lto Lallow Lfor L of Lthe Lconcrete
Lspecimen. L- LCORRECT LANSWER L-2-4 L... Lsettling
The Lstrength Lof Lthe Lpaste Ldepends Lon:
A. The Lwater-cement Lratio
B. Time
C. The Lequipment Lused
D. Type Lof Lcement L- LCORRECT LANSWER L-A. LThe Lwater-cement Lratio
A Lslight Ltwisting Laction Lwill Lhelp Leliminate L and Lair L when Lteh Lcapping Lplate Lis Lplaced
Lonto Lt Lhe Lound Lmound Lof Lpaste. L-ACORRECT LANSWER L-cracks L... Lvoids
Neat Lcement Lpaste Lcaps Lshould Lnot Lbe Lused Lon Ldry Lspecimens Lbecause Lthe Lcaps Lmay L and
L
when Ldry. L- LCORRECT LANSWER L-crack
The Ltechnician Lshould Lremove Lall L or L materials Lfrom Lthe Lends Lof Lhardened Lconcrete
Lcylinde Lrs Lbefore Lcapping. L- LCORRECT LANSWER L-debris L... Lforeign
the Lpot Land Lrecharge Lthe Lfresh Lmaterial Lat Lintervals Lto Lensure Lthat Lthe Loldest Lmaterial
Lhas Lnot Lbe Len Lused Lmore Lthan L times. L- LCORRECT LANSWER L-Stir L... Lfive
True Lor Lfalse? LWhen Lcapping Lconcrete Lcylinders Lwith La Lcomprehensive Lstrength Lof L35 LMPa
L[5000 Lpsi] Lor Lgreater, Lit Lis Lpermitted Lto Lreuse Lcompound Lrecovered Lfrom Lthe Lcapping
Loperation Lor Lold Lcaps. L- LCORRECT LANSWER L-True
QUESTIONS WITH CORRECT ANSWERS 2025
Name the two allowable materials with with concrete cylinders may be capped with. -
CORRECT ANSWER -I. High-strength gypsum
II. Sulfur mortar
III. Neat cement paste
Name the three materials with with cylinders may be capped against. - CORRECT ANSWER -I. Glass
II. Metal
III. Granite
Prior to beginning the capping procedure, what must the metal plate be inspected for? -
CORRECT ANSWER -I. Grooves
II. Gouches
III. Indentations
What is the maximum allowable size of any indentation on the base plate? - CORRECT ANSWER -
0.010 in [0.25 mm]
Upon receipt of the capingAmaterial, for how long can it be kept in intervals? - CORRECT ANSWER -
3 months
When must the neat cement paste be applied it to the cylinder? - CORRECT ANSWER -Immediately
For how long must the concrete settle in the mold prior to applying the neat cement paste? -
CORRECT ANSWER -2 to 4 hours
Prior to capping, name the three tasks that must be performed on the cylinder. - CORRECT ANSWER -
I. Inspect for any bumps greater than 1/8"
II. Remove foreign debris.
III. Remove any excess water or laitence.
,What is the required position of the concrete cylinder? - CORRECT ANSWER -90° ± 0.5°
Name the required temperature range of the heated sulfar mortar mixture. - CORRECT ANSWER -
265°F to 290 °F [130 °C to 145 °C]
What is the maximum number of times that the heated sulfur may be used per cylinder capping proced
ure? - CORRECT ANSWER -5 times
These procedures for capping enable concrete cylinders and cores to meet the standard practice's requi
rements for and . - CORRECT ANSWER -perpendicularity ... planeness ... perpendicularity
Equipment needed for the capping process includes capping devices and pots. -
CORRECT ANSWER -plates ... alignment ... melting
Plates for neat cement and high-
strength gypsum plaster caps should be made of , , or . - CORRECT ANSWER -
metal ... glass ..... granite
Sulfar mortar cap plates should be formed against or plates. - CORRECT ANSWER -
marble .... stone
True or false? The purpose of the guide bar or bull's eye level is to ensure that caps remain perpendicul
ar to the axi of the cylinder within 0.5 degrees. - CORRECT ANSWER -True
To avoid accidents during reheating of cooled sulfur, use melting pots that have .-
CORRECT ANSWER -Metal covers
The technician should use a stiff layer of to cap fresh concrete cylinders. - CORRECT ANSWER -
Burlap
Hardened concrete cylinders should be capped with , , or .-
CORRECT ANSWER -cement paste ... gypsum ..... mortar sulfur
, True Lor Lfalse? LPlasters Lof Lparis Land Lmixtures Lof Lplaster Lof Lparis Land Lportland Lare Lexamples Lof
Lsuitable Lhi Lgh-strength Lplasters. L- LCORRECT LANSWER L-True
Sulfar Lmortars Land Lhigh-
strength Lgypsum Lcement Lcubes Lmust Ldemonstrate La Lminimum Lcompressive Lstrength Lof L or L ,
Lwhichever Lis Lgreater. L- LCORRECT LANSWER L-5000 Lpsi
The Lcement Lpaste Lshould Lbe Lapplied Lto Lthe Lfreshly Lmolded Lcylinder Lfrom L hours Lafter Lmolding.
LThi Ls Lis Lto Lallow Lfor L of Lthe Lconcrete
Lspecimen. L- LCORRECT LANSWER L-2-4 L... Lsettling
The Lstrength Lof Lthe Lpaste Ldepends Lon:
A. The Lwater-cement Lratio
B. Time
C. The Lequipment Lused
D. Type Lof Lcement L- LCORRECT LANSWER L-A. LThe Lwater-cement Lratio
A Lslight Ltwisting Laction Lwill Lhelp Leliminate L and Lair L when Lteh Lcapping Lplate Lis Lplaced
Lonto Lt Lhe Lound Lmound Lof Lpaste. L-ACORRECT LANSWER L-cracks L... Lvoids
Neat Lcement Lpaste Lcaps Lshould Lnot Lbe Lused Lon Ldry Lspecimens Lbecause Lthe Lcaps Lmay L and
L
when Ldry. L- LCORRECT LANSWER L-crack
The Ltechnician Lshould Lremove Lall L or L materials Lfrom Lthe Lends Lof Lhardened Lconcrete
Lcylinde Lrs Lbefore Lcapping. L- LCORRECT LANSWER L-debris L... Lforeign
the Lpot Land Lrecharge Lthe Lfresh Lmaterial Lat Lintervals Lto Lensure Lthat Lthe Loldest Lmaterial
Lhas Lnot Lbe Len Lused Lmore Lthan L times. L- LCORRECT LANSWER L-Stir L... Lfive
True Lor Lfalse? LWhen Lcapping Lconcrete Lcylinders Lwith La Lcomprehensive Lstrength Lof L35 LMPa
L[5000 Lpsi] Lor Lgreater, Lit Lis Lpermitted Lto Lreuse Lcompound Lrecovered Lfrom Lthe Lcapping
Loperation Lor Lold Lcaps. L- LCORRECT LANSWER L-True
