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ACI Strength Exam Study Guide
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ACI Strength Exam Study GuideName the two allowable materials with with concrete cylinders may be
capped with. - -I. High-strength gypsum
II. Sulfur mortar
III. Neat cement paste
-Name the three materials with with cylinders may be capped against. - -I.
Glass
II. Metal
III. Granite
-Prior to beginning the capping procedure, what must the metal plate be
inspected for? - -I. Grooves
II. Gouches
III. Indentations
-What is the maximum allowable size of any indentation on the base plate? -
-0.010 in [0.25 mm]
-Upon receipt of the caping material, for how long can it be kept in intervals?
- -3 months
-When must the neat cement paste be applied it to the cylinder? - -
Immediately
-For how long must the concrete settle in the mold prior to applying the neat
cement paste? - -2 to 4 hours
-Prior to capping, name the three tasks that must be performed on the
cylinder. - -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? - -90° ± 0.5°
-Name the required temperature range of the heated sulfar mortar mixture.
- -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 procedure? - -5 times
-These procedures for capping enable concrete cylinders and cores to meet
the standard practice's requirements for _____ and _____. - -
perpendicularity ... planeness ... perpendicularity
, -Equipment needed for the capping process includes capping ____ ____
devices and _____ pots. - -plates ... alignment ... melting
-Plates for neat cement and high-strength gypsum plaster caps should be
made of ____, _____, or _____. - -metal ... glass .... granite
-Sulfar mortar cap plates should be formed against _____ or _____ plates. - -
marble ... stone
-True or false? The purpose of the guide bar or bull's eye level is to ensure
that caps remain perpendicular to the axi of the cylinder within 0.5 degrees.
- -True
-To avoid accidents during reheating of cooled sulfur, use melting pots that
have _____. - -Metal covers
-The technician should use a stiff layer of _____ to cap fresh concrete
cylinders. - -Burlap
-Hardened concrete cylinders should be capped with ________, ______, or
_______. - -cement paste ... gypsum .... mortar sulfur
-True or false? Plasters of paris and mixtures of plaster of paris and portland
are examples of suitable high-strength plasters. - -True
-Sulfar mortars and high-strength gypsum cement cubes must demonstrate
a minimum compressive strength of _____ or _____, whichever is greater. - -
5000 psi
-The cement paste should be applied to the freshly molded cylinder from
_____ hours after molding. This is to allow for _____ of the concrete specimen.
- -2-4 ... settling
-The strength of the paste depends on:
A. The water-cement ratio
B. Time
C. The equipment used
D. Type of cement - -A. The water-cement ratio
-A slight twisting action will help eliminate _____ and air _____ when teh
capping plate is placed onto the ound mound of paste. - -cracks ... voids
-Neat cement paste caps should not be used on dry specimens because the
caps may _____ and _____ when dry. - -crack
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