ACI - Concrete Strength Testing Technician (CSTT) Exam 2026

ACI - Concrete Strength
Testing Technician (CSTT)
Exam 2026

Standard Practice for Capping Cylindrical Concrete Specimens—ANSWER--ASTM C617


Procedures for capping enable concrete cylinders and cores to meet C617's practice

requirements for___ and___.


C617—ANSWER--perpendicularity, planeness




C617, 3.1


____ ____ can be made of glass, machined metal, polished granite, or diabase.


C617—ANSWER--Capping plates




C617, 4.1


Sulfur caps can be formed against ___ or___ plates.


C617—ANSWER--metal, stone

,C617, 4.1


The working surface of a capping plate shall not depart from a plane by more than ___ inch (

___ mm) in 6 inches (150 mm).


C617—ANSWER--0.002 inch (0.05 mm)




C617, 4.1


Device used in conjunction with a capping plate to ensure perpendicularity.


C617—ANSWER--Alignment device




C617, 4.2


Perpendicularity requirement of the axis of a cylindrical specimen is ___° .


C617—ANSWER--0.5°




C617, 4.2


The element of a melting pot that ensures against accidents during the reheating of cooled

sulfur.


C617—ANSWER--Peripheral Heating




C617, 4.3.1


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, Temperature of the sulfur mortar pot / materials.


C617—ANSWER--265 - 290°F (130 - 145°C)




C617, 5.4.2


Capping material to be used on freshly molded cylinders.


C617—ANSWER--Neat Portland Cement paste




C617, 6.1


Remove this from the end of cylinders before capping.


C617—ANSWER--oily or waxy materials




C617, 6.2.1


Materials that can be used to cap hardened cement concrete cylinders are ___ , ___ , ___ .


C617—ANSWER--Neat Portland Cement, Gypsum Cement, Sulfur mortar




C617, 1.1


Plaster of paris is an example of a high-strength plaster. (T/F)


C617—ANSWER--False