1
CON 353 Questions with Answers (100% Correct
Answers)
What is the inspection prior to placing concrete?— Answer:
Reinforcement Inspection
Reinforcement inspection— Answer: 1. Performed by a 3rd party
inspector (Residentially performed by the building inspector) (IBC)
2. Approved placement drawings (rebar shops)
3. Rebar Diameter & Grade
4. Rebar Spacing
5. Coverage Requirements with proper support (dobies, plastic chairs,
steel chairs)
6. Splices
7. American Concrete Institute - Tolerances & Placement manual
produces the standards in most specifications
Concrete Admixture?— Answer: Chemicals added to the concrete at
time of batch or prior to placement
© 2025 All rights reserved
, 2
Accelerators— Answer: •speed up the hydration, or hardening, of the
wet concrete. Often used in colder temperatures so the concrete crew
has less waiting time between placing and finishing the concrete.
Retarders— Answer: •slow the hydration, or hardening, of the wet
concrete. Often used in hotter temperatures so the concrete doesn't set
too quickly, allowing the concrete finishing crew to get the proper
finishing work completed.
Air entraining— Answer: •agents add and help distribute tiny air
bubbles throughout the concrete. These tiny air bubbles help the
concrete resist the freeze-thaw cycles with much less cracking and
damage.
Plasticizers and Superplasticizers— Answer: improve the workability
of the concrete during the wet (or plastic) stage allowing the concrete
to flow more easily. They are particularly helpful when placing
concrete around congested rebar arrangements.
What is truck spacing for concrete pours?— Answer: •Truck spacing is
calculating the anticipated placement rate based upon the type of
element you are placing. The importance of truck spacing stems from
the specifications. Often times the specs will reference an ASTM
© 2025 All rights reserved
CON 353 Questions with Answers (100% Correct
Answers)
What is the inspection prior to placing concrete?— Answer:
Reinforcement Inspection
Reinforcement inspection— Answer: 1. Performed by a 3rd party
inspector (Residentially performed by the building inspector) (IBC)
2. Approved placement drawings (rebar shops)
3. Rebar Diameter & Grade
4. Rebar Spacing
5. Coverage Requirements with proper support (dobies, plastic chairs,
steel chairs)
6. Splices
7. American Concrete Institute - Tolerances & Placement manual
produces the standards in most specifications
Concrete Admixture?— Answer: Chemicals added to the concrete at
time of batch or prior to placement
© 2025 All rights reserved
, 2
Accelerators— Answer: •speed up the hydration, or hardening, of the
wet concrete. Often used in colder temperatures so the concrete crew
has less waiting time between placing and finishing the concrete.
Retarders— Answer: •slow the hydration, or hardening, of the wet
concrete. Often used in hotter temperatures so the concrete doesn't set
too quickly, allowing the concrete finishing crew to get the proper
finishing work completed.
Air entraining— Answer: •agents add and help distribute tiny air
bubbles throughout the concrete. These tiny air bubbles help the
concrete resist the freeze-thaw cycles with much less cracking and
damage.
Plasticizers and Superplasticizers— Answer: improve the workability
of the concrete during the wet (or plastic) stage allowing the concrete
to flow more easily. They are particularly helpful when placing
concrete around congested rebar arrangements.
What is truck spacing for concrete pours?— Answer: •Truck spacing is
calculating the anticipated placement rate based upon the type of
element you are placing. The importance of truck spacing stems from
the specifications. Often times the specs will reference an ASTM
© 2025 All rights reserved
