APA Precast Concrete Batch Plant Operator
UPDATED ACTUAL Exam Questions and
CORRECT Answers
Concrete is a mixture of _____, ______, and ______. - CORRECT ANSWER cement,
water, and aggregates.
The most commonly used concrete for structural purposes is: - CORRECT
ANSWER Normal weight concrete.
Normal weight concrete weighs approximately: - CORRECT ANSWER 140 lb/ft^3
Lightweight structural concrete may weigh from _____ to ______ lb/ft^3. - CORRECT
ANSWER 90, 100
Heavyweight concrete may weigh ______. - CORRECT ANSWER 200 lb/ft^3 or more.
Most concrete today is made with: - CORRECT ANSWER Portland Cement
Concrete is usually referred to as a mixture of two components; ______ and _______. -
CORRECT ANSWER aggregate, paste
The hardening process of the paste is a chemical reaction called _________. - CORRECT
ANSWER Hydration
_______ is developed in the hydration process. It may peak up to _______ degrees. - CORRECT
ANSWER heat;130 F
, Concrete does hardens and cures by drying. True or False - CORRECT ANSWER False ;
Concrete does not harden or cure by drying, because cement needs moisture to hydrate and gain
strength. When concrete dries fully, hydration stops, and it no longer gains strength.
A mixture of cement and water is called: - CORRECT ANSWER paste
When sand is added to paste it is called: - CORRECT ANSWER mortar or grout
When coarse aggregate is added to mortar, the combination is called ______. - CORRECT
ANSWER concrete
________ make up about 60 to 75% of the volume of concrete - CORRECT
ANSWER Aggregates
The particle size distribution or combined coarse and fine aggregate gradation should have all
sizes present in adequate amounts. True or False - CORRECT ANSWER True. If the
gradation is evenly distributed adequately the void content to be filled by the cement paste is
minimized. This process produces a concrete that will hold together without segregating and will
minimize the need for cement or cementitious content.
Minimizing the cement in the mixture also benefits ________ stability, _______ development,
and _________. - CORRECT ANSWER volume, heat, durability
There are primarily two types of aggregates, _______ or ________. - CORRECT
ANSWER crushed, natural
Crushed aggregates can be either coarse or fine. True or False - CORRECT
ANSWER True
Crushed aggregates were naturally formed and then _______ and _______. - CORRECT
ANSWER mined, crushed
UPDATED ACTUAL Exam Questions and
CORRECT Answers
Concrete is a mixture of _____, ______, and ______. - CORRECT ANSWER cement,
water, and aggregates.
The most commonly used concrete for structural purposes is: - CORRECT
ANSWER Normal weight concrete.
Normal weight concrete weighs approximately: - CORRECT ANSWER 140 lb/ft^3
Lightweight structural concrete may weigh from _____ to ______ lb/ft^3. - CORRECT
ANSWER 90, 100
Heavyweight concrete may weigh ______. - CORRECT ANSWER 200 lb/ft^3 or more.
Most concrete today is made with: - CORRECT ANSWER Portland Cement
Concrete is usually referred to as a mixture of two components; ______ and _______. -
CORRECT ANSWER aggregate, paste
The hardening process of the paste is a chemical reaction called _________. - CORRECT
ANSWER Hydration
_______ is developed in the hydration process. It may peak up to _______ degrees. - CORRECT
ANSWER heat;130 F
, Concrete does hardens and cures by drying. True or False - CORRECT ANSWER False ;
Concrete does not harden or cure by drying, because cement needs moisture to hydrate and gain
strength. When concrete dries fully, hydration stops, and it no longer gains strength.
A mixture of cement and water is called: - CORRECT ANSWER paste
When sand is added to paste it is called: - CORRECT ANSWER mortar or grout
When coarse aggregate is added to mortar, the combination is called ______. - CORRECT
ANSWER concrete
________ make up about 60 to 75% of the volume of concrete - CORRECT
ANSWER Aggregates
The particle size distribution or combined coarse and fine aggregate gradation should have all
sizes present in adequate amounts. True or False - CORRECT ANSWER True. If the
gradation is evenly distributed adequately the void content to be filled by the cement paste is
minimized. This process produces a concrete that will hold together without segregating and will
minimize the need for cement or cementitious content.
Minimizing the cement in the mixture also benefits ________ stability, _______ development,
and _________. - CORRECT ANSWER volume, heat, durability
There are primarily two types of aggregates, _______ or ________. - CORRECT
ANSWER crushed, natural
Crushed aggregates can be either coarse or fine. True or False - CORRECT
ANSWER True
Crushed aggregates were naturally formed and then _______ and _______. - CORRECT
ANSWER mined, crushed
