APA Precast Concrete Batch
Plant Operator Questions With
Correct Verified Answers 2025-
2026 ||ALREADY GRADED A+||
NEWEST VERSION
Concrete is a mixture of _____, ______, and ______. - ANSWER cement,
water, and aggregates.
The most commonly used concrete for structural purposes is: -
ANSWER Normal weight concrete.
Normal weight concrete weighs approximately: - ANSWER 140 lb/ft^3
Lightweight structural concrete may weigh from _____ to ______ lb/ft^3.
- ANSWER 90, 100
Heavyweight concrete may weigh ______. - ANSWER 200 lb/ft^3 or
more.
Most concrete today is made with: - ANSWER Portland Cement
Concrete is usually referred to as a mixture of two components; ______
and _______. - ANSWER aggregate, paste
The hardening process of the paste is a chemical reaction called
_________. - ANSWER Hydration
_______ is developed in the hydration process. It may peak up to
_______ degrees. - ANSWER heat;130 F
Concrete does hardens and cures by drying. True or False - 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: - ANSWER paste
,When sand is added to paste it is called: - ANSWER mortar or grout
When coarse aggregate is added to mortar, the combination is called
______. - ANSWER concrete
________ make up about 60 to 75% of the volume of concrete -
ANSWER Aggregates
The particle size distribution or combined coarse and fine aggregate
gradation should have all sizes present in adequate amounts. True or
False - 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 _________. - ANSWER volume, heat,
durability
There are primarily two types of aggregates, _______ or ________. -
ANSWER crushed, natural
Crushed aggregates can be either coarse or fine. True or False -
ANSWER True
Crushed aggregates were naturally formed and then _______ and
_______. - ANSWER mined, crushed
Crushed aggregates are also referred to as ________ aggregates -
ANSWER manufactured aggregates
Natural aggregates can be coarse or fine. True or False - ANSWER True
Natural aggregates are those that are used in concrete in the state they
exist in ________. - ANSWER nature
Natural aggregates are a product of natural weathering and are typically
referred to as ______ and _______. - ANSWER sand;gravel
The six concrete properties influenced by aggregates are: - ANSWER
Strength,Workability, Finishability,Water Requirements, Durability,
Volume Change
, Some aggregates have better bonding properties with cement paste
because of their surface _______ or ________. - ANSWER texture;
mineralogy
Aggregates can effect concrete strength because of their particle ______,
maximum _______, and ________. - ANSWER shape, size, grading
A high strength aggregate always increases the strength of the concrete.
True or False - ANSWER False ; A high strength aggregate does not
necessarily increase the strength of the concrete. More important is the
aggregate's compatibility with the cement paste and the aggregate's
relative commpressibility, comparted to that of the surrounding cement
paste.
In general, the more angular the aggregate and to a greater degree the
fine aggregate,the more difficult it becomes to _____ the concrete. -
ANSWER finish
An adequate amount of fines passing through the No. 50 sieve is
necessary to hold fresh concrete together without ________. - ANSWER
segregation
The grading of the coarse aggregate and its uniformity from batch to
batch is important to the _______ of concrete. - ANSWER workability
Typically, the more rounded the aggregate, especially the fine aggregate,
the better the __________. - ANSWER finishability
The grading, particle shape, mineralogy, and _________ have a
significant role as to the amount of water needed in concrete to produce a
given ______. - ANSWER absorbtion;slump
Aggregates with excessive fines or angular particles will require less
water to produce a target slump. True or False - ANSWER False;
Aggregates with excessive fines or angular particles will require MORE
water to produce a target slump.
With the increase in water to cement ratio, the strength of concrete can
be ______. - ANSWER Reduced
Freeze-thaw resistance, shrinkage, cracking, abrasion resistance,
chemical attack, and alkali reaction are all factors of concrete _________
Plant Operator Questions With
Correct Verified Answers 2025-
2026 ||ALREADY GRADED A+||
NEWEST VERSION
Concrete is a mixture of _____, ______, and ______. - ANSWER cement,
water, and aggregates.
The most commonly used concrete for structural purposes is: -
ANSWER Normal weight concrete.
Normal weight concrete weighs approximately: - ANSWER 140 lb/ft^3
Lightweight structural concrete may weigh from _____ to ______ lb/ft^3.
- ANSWER 90, 100
Heavyweight concrete may weigh ______. - ANSWER 200 lb/ft^3 or
more.
Most concrete today is made with: - ANSWER Portland Cement
Concrete is usually referred to as a mixture of two components; ______
and _______. - ANSWER aggregate, paste
The hardening process of the paste is a chemical reaction called
_________. - ANSWER Hydration
_______ is developed in the hydration process. It may peak up to
_______ degrees. - ANSWER heat;130 F
Concrete does hardens and cures by drying. True or False - 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: - ANSWER paste
,When sand is added to paste it is called: - ANSWER mortar or grout
When coarse aggregate is added to mortar, the combination is called
______. - ANSWER concrete
________ make up about 60 to 75% of the volume of concrete -
ANSWER Aggregates
The particle size distribution or combined coarse and fine aggregate
gradation should have all sizes present in adequate amounts. True or
False - 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 _________. - ANSWER volume, heat,
durability
There are primarily two types of aggregates, _______ or ________. -
ANSWER crushed, natural
Crushed aggregates can be either coarse or fine. True or False -
ANSWER True
Crushed aggregates were naturally formed and then _______ and
_______. - ANSWER mined, crushed
Crushed aggregates are also referred to as ________ aggregates -
ANSWER manufactured aggregates
Natural aggregates can be coarse or fine. True or False - ANSWER True
Natural aggregates are those that are used in concrete in the state they
exist in ________. - ANSWER nature
Natural aggregates are a product of natural weathering and are typically
referred to as ______ and _______. - ANSWER sand;gravel
The six concrete properties influenced by aggregates are: - ANSWER
Strength,Workability, Finishability,Water Requirements, Durability,
Volume Change
, Some aggregates have better bonding properties with cement paste
because of their surface _______ or ________. - ANSWER texture;
mineralogy
Aggregates can effect concrete strength because of their particle ______,
maximum _______, and ________. - ANSWER shape, size, grading
A high strength aggregate always increases the strength of the concrete.
True or False - ANSWER False ; A high strength aggregate does not
necessarily increase the strength of the concrete. More important is the
aggregate's compatibility with the cement paste and the aggregate's
relative commpressibility, comparted to that of the surrounding cement
paste.
In general, the more angular the aggregate and to a greater degree the
fine aggregate,the more difficult it becomes to _____ the concrete. -
ANSWER finish
An adequate amount of fines passing through the No. 50 sieve is
necessary to hold fresh concrete together without ________. - ANSWER
segregation
The grading of the coarse aggregate and its uniformity from batch to
batch is important to the _______ of concrete. - ANSWER workability
Typically, the more rounded the aggregate, especially the fine aggregate,
the better the __________. - ANSWER finishability
The grading, particle shape, mineralogy, and _________ have a
significant role as to the amount of water needed in concrete to produce a
given ______. - ANSWER absorbtion;slump
Aggregates with excessive fines or angular particles will require less
water to produce a target slump. True or False - ANSWER False;
Aggregates with excessive fines or angular particles will require MORE
water to produce a target slump.
With the increase in water to cement ratio, the strength of concrete can
be ______. - ANSWER Reduced
Freeze-thaw resistance, shrinkage, cracking, abrasion resistance,
chemical attack, and alkali reaction are all factors of concrete _________
