NASCLA Final Practice Exam Preparation
NASCLA FINAL PRACTICE EXAM PREPARATION NEWEST 2025/2026
COMPLETE 300 QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS)|ALREADY GRADED A+
What is the distance from the outside of the bar to the surface of the concrete
(I.e. Concrete cover) for a cast against and permanently exposed to earth (such as
footings)?
3 inch
The load-carrying capacity could be reduced by approximately ________ % by
lowering the top bars or raising the bottom bars by ½ in. more that specified in a 6
in deep slab.
20
A variation of plus or minus 1 in. is permissible in the placement of ___________.
Stirrups
_________ splices are often more economical than other types of splices.
Lap
The following are types of joints except:
Extend joints
1|Page
, NASCLA Final Practice Exam Preparation
__________________ permit slight
movement and help prevent random cracking due to the restraint of shrinkage,
slight rotations, or settlement of the slab.
Isolation joints
What does PVC stand for and what does it do?
Polyvinyl Chloride - strips of material placed across a joint to obstruct the seepage
of water
A construction joint must be provided when concrete _______ is interrupted.
Placement
Isolation joints (i.e. _________) are used to
separate the slab from any adjacent structure such as another slab, wall, column,
adjacent building, or any appurtenance in the slab.
Expansion joints
Welded wire reinforcement does NOT add significant flexural strength and doesn't
increase the load-carrying capacity of the slab. What is the sole purpose or WWR?
To prevent cracks from opening
Fibers in fiber reinforcement does all of the following except:
Increases shrinkability and enhances durability
2|Page
, NASCLA Final Practice Exam Preparation
The ready-mixed concrete producer or testing lab submits the proportions for
each of the concrete mixes to be used to the contactor who will submit them to
__________ before concreting can begin.
The specifier
Who is authorized to order or make changes to the order or the schedule for
ready mixed concrete?
Contractor
There should be an agreed-upon plan for trucks to enter and leave a jobsite
________ the first truck arrives.
Before
Rounded aggregates, such as ___________, will pump more easily than angular
aggregates.
River gravel
A well-graded mix will have all of the following except:
Tamping rod
A lightweight aggregate presoaked should consistently contain ________ percent
of total absorption to not lead to pumping difficultly.
70 to 80
3|Page
, NASCLA Final Practice Exam Preparation
The time at which the concrete is fluid within the ________ of vibration will be
the best guide for both the spacing and time of vibration.
10-15 seconds
What follows screeding to fill in minor low spots or cut off high points and to
embed coarse aggregate particles into the surface?
Checkrod
These types of floats are preferred for non-air-entrained concrete:
Wood
For a uniform and skid-resistant surface, a __________ finish can be applied.
Broomed
A rule of thumb is that an increase of
_________°F in concrete temperature reduces finishing time by 50%.
20
What continues to be used as an accelerator at a rate of 1 to 2 percent of the
weight of cement in the mix?
Calcium chloride
When choosing to prevent evaporation from occurring by applying water to
concrete, all the following are methods except:
4|Page
NASCLA FINAL PRACTICE EXAM PREPARATION NEWEST 2025/2026
COMPLETE 300 QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS)|ALREADY GRADED A+
What is the distance from the outside of the bar to the surface of the concrete
(I.e. Concrete cover) for a cast against and permanently exposed to earth (such as
footings)?
3 inch
The load-carrying capacity could be reduced by approximately ________ % by
lowering the top bars or raising the bottom bars by ½ in. more that specified in a 6
in deep slab.
20
A variation of plus or minus 1 in. is permissible in the placement of ___________.
Stirrups
_________ splices are often more economical than other types of splices.
Lap
The following are types of joints except:
Extend joints
1|Page
, NASCLA Final Practice Exam Preparation
__________________ permit slight
movement and help prevent random cracking due to the restraint of shrinkage,
slight rotations, or settlement of the slab.
Isolation joints
What does PVC stand for and what does it do?
Polyvinyl Chloride - strips of material placed across a joint to obstruct the seepage
of water
A construction joint must be provided when concrete _______ is interrupted.
Placement
Isolation joints (i.e. _________) are used to
separate the slab from any adjacent structure such as another slab, wall, column,
adjacent building, or any appurtenance in the slab.
Expansion joints
Welded wire reinforcement does NOT add significant flexural strength and doesn't
increase the load-carrying capacity of the slab. What is the sole purpose or WWR?
To prevent cracks from opening
Fibers in fiber reinforcement does all of the following except:
Increases shrinkability and enhances durability
2|Page
, NASCLA Final Practice Exam Preparation
The ready-mixed concrete producer or testing lab submits the proportions for
each of the concrete mixes to be used to the contactor who will submit them to
__________ before concreting can begin.
The specifier
Who is authorized to order or make changes to the order or the schedule for
ready mixed concrete?
Contractor
There should be an agreed-upon plan for trucks to enter and leave a jobsite
________ the first truck arrives.
Before
Rounded aggregates, such as ___________, will pump more easily than angular
aggregates.
River gravel
A well-graded mix will have all of the following except:
Tamping rod
A lightweight aggregate presoaked should consistently contain ________ percent
of total absorption to not lead to pumping difficultly.
70 to 80
3|Page
, NASCLA Final Practice Exam Preparation
The time at which the concrete is fluid within the ________ of vibration will be
the best guide for both the spacing and time of vibration.
10-15 seconds
What follows screeding to fill in minor low spots or cut off high points and to
embed coarse aggregate particles into the surface?
Checkrod
These types of floats are preferred for non-air-entrained concrete:
Wood
For a uniform and skid-resistant surface, a __________ finish can be applied.
Broomed
A rule of thumb is that an increase of
_________°F in concrete temperature reduces finishing time by 50%.
20
What continues to be used as an accelerator at a rate of 1 to 2 percent of the
weight of cement in the mix?
Calcium chloride
When choosing to prevent evaporation from occurring by applying water to
concrete, all the following are methods except:
4|Page
