CONCRETE FLATWORK TECH AND FLATWORK FINISHER
EXAMS SCRIPT QUESTIONS AND ANSWERS SURE A+
✔✔kept at the job site and cured under conditions similar to the curing conditions for the
concrete they represent. - ✔✔(Ch. 2, #14) To determine if concrete, in place, has the
strength needed to put it into service, test cylinders should be:
✔✔False (Granular subbases and sandy soils can be compacted with *vibratory
compactors*, while clay or silty soils can be compacted with the kneading action of a
sheepsfoot roller.) - ✔✔(Ch. 3, #1) True or False: Granular subbases for slabs on
ground can be compacted with sheepsfoot rollers.
✔✔frost - ✔✔(Ch. 3, #2) In cold weather, the subgrade soil must be free of _____
before concrete placing begins.
✔✔False(Water can be sprinkled on the subgrade or subbase before concreting, but it
*shouldn't* result in puddles on the surface or soft, muddy spots.) - ✔✔(Ch. 3, #3) True
or False: Before a concrete slab on ground is placed under severe drying conditions
that threaten plastic shrinkage cracking, water should be sprayed on the subgrade until
puddles are formed and the surface is soft.
✔✔measuring down from a straightedge spanning between the side forms - ✔✔(Ch. 3,
#4) Before concreting, workers should check the elevation of the subbase by:
✔✔False (If the surface is too low, it will be thicker and require more concrete than
anticipated) - ✔✔(Ch. 3, #5) If the surface for a subbase for a concrete slab on ground
is too low, the slab is likely to be too thin.
✔✔Checkerboard (recommended methods include adjacent and alternate lanes) -
✔✔(Ch. 3, #6) Which one of the placing sequences for casting slabs-on-ground is *not*
recommended?
✔✔form setting and screeding - ✔✔(Ch. 3, #7) Which has the greatest effect on floor
levelness?
✔✔False (There should be no holes in the sheet, as these will expose the underside of
the slab to moisture that can seep through any cracks or joints.) - ✔✔(Ch. 3, #8) True or
False: When concrete will be placed directly on a vapor retarder, finishers should use a
margin trowel to punch holes in the vapor retarder and thus decrease waiting time
before the concrete can be finished.
✔✔placing a 3-in. (75mm) thick layer of compactible manufactured sand (containing
rock dust) on the vapor retarder before concrete placement - ✔✔(Ch. 3, #9) When
,specifications don't require the concrete slab to be in direct contact with the vapor
retarder, the preferred method for reducing potential problems caused by slab curling is:
✔✔keeping any slab cracks tightly closed - ✔✔(Ch. 3, #10) The primary function of
welded wire reinforcement in slabs-on-ground that are considered unreinforced is:
✔✔Reinforcing steel be discontinued (cut) so it doesn't pass through the joint, or that
every other bar or wire be discontinued (cut) so only half the steel passes through the
joint. - ✔✔(Ch. 3, #11) Instructions for drawings for slabs-on-ground may require that:
✔✔True - ✔✔(Ch. 3, #12) True or False: Reinforcing steel should be located at or
above mid-depth of slabs on ground so cracks will remain tightly closed at the surface.
✔✔steel dowels - ✔✔(Ch. 3, #13) Load transfer at construction joints can be provided
by smooth _____ ______ or other types of load transfer devices.
✔✔6 - ✔✔(Ch. 3, #14) Keyed construction joints are not recommended for slabs subject
to heavy wheel traffic or for slabs less than ____ in. thick.
✔✔floor flatness - ✔✔(Ch. 4, #1) Measuring the gap under a 10-ft straightedge is one
way of determining:
✔✔the location under the 10-ft straightedge that is between the two high spots where
the straightedge is resting. - ✔✔(Ch. 4, #2) The gap under a straightedge should be
measured at:
✔✔floor flatness and levelness - ✔✔(Ch. 4, #3) The F-number system is one way of
determining:
✔✔True - ✔✔(Ch. 4, #4) True or False: F(f) numbers are indicators of floor surface
smoothness or flatness.
✔✔True - ✔✔(Ch. 4, #5) True or False: F(l) numbers are indicators of levelness or tilt of
the floor surface.
✔✔Floating, restraightening, troweling - ✔✔(Ch. 4, #6) Which finishing operations affect
floor flatness?
✔✔flat but not level - ✔✔(Ch. 4, #7) A floor with an F(f) value of 48 and an F(l) value of
16 is:
✔✔a lot of finishing effort needed to get a high F(f) number floor - ✔✔(Ch. 4, #8) A 3-in.
(75mm)-slump concrete that sets very fast is most likely to result in:
, ✔✔24; 72 - ✔✔(Ch. 4, #9) F-number testing should preferably be done within ____
hours after concrete placement, but never later than ____ hours after concrete
placement.
✔✔True - ✔✔(Ch. 4, #10) True or False: A floor with an F(f) number of 40 is twice as
flat as a floor with an F(f) number of 20.
✔✔False (Measurements after 72 hours may reflect other influences, such as slab
curling, that affect flatness or levelness but are beyond the finisher's control.) - ✔✔(Ch.
4, #11) True or False: Floor flatness measurements taken more than 72 hours after
concrete placement are the best measure of the finishers' skills.
✔✔10 to 20 ft (3 to 6 m) apart - ✔✔(Ch. 4, #12) The highest quality of levelness can be
achieved by using hard edge forms spaced:
✔✔Trucks must drive over sidewalks, curbs, or driveways; Slab reinforcing bars are
supported by chairs; truck tires leave deep ruts in the subgrade or granular base. -
✔✔(Ch. 5, #1) If the ready mix truck can be driven into the slab placement area, chuting
concrete directly into the forms is usually the easiest and most economical placing
method. This may not be possible when:
✔✔cracking - ✔✔(Ch. 5, #2) Although placing concrete directly from the truck is
economical, getting the truck to the discharge point may require driving it over curbs, or
on sidewalks or driveways. To avoid ________ of the curbs, sidewalks, or driveways,
earth ramps may need to be built.
✔✔6 - ✔✔(Ch. 5, #3) When guiding a concrete truck near a 6-ft (2 m)-deep excavation,
the truck wheels closest to the excavation should be ____ ft (m) or more away from the
edge of the excavation.
✔✔True - ✔✔(Ch. 5, #4) True or False: When the concrete truck chutes won't reach the
forms, the concrete supplier must approve adding more chutes supported off the truck.
✔✔plywood ramp - ✔✔(Ch. 5, #5) Manual or motorized buggies can be used to
transport concrete from the truck mixer to the point of deposit, but a temporary
________ ________ is usually needed to prevent the buggies from riding directly on
any reinforcing bars.
✔✔personnel; travel - ✔✔(Ch. 5, #6) When concrete is placed by crane and bucket,
buckets must never be lifted over __________ or over ______ paths.
✔✔height restrictions - ✔✔(Ch. 5, #7) Truck-mounted conveyors are especially useful
on jobs with ______ __________ such as warehouse slabs when the building is
enclosed prior to placement.
EXAMS SCRIPT QUESTIONS AND ANSWERS SURE A+
✔✔kept at the job site and cured under conditions similar to the curing conditions for the
concrete they represent. - ✔✔(Ch. 2, #14) To determine if concrete, in place, has the
strength needed to put it into service, test cylinders should be:
✔✔False (Granular subbases and sandy soils can be compacted with *vibratory
compactors*, while clay or silty soils can be compacted with the kneading action of a
sheepsfoot roller.) - ✔✔(Ch. 3, #1) True or False: Granular subbases for slabs on
ground can be compacted with sheepsfoot rollers.
✔✔frost - ✔✔(Ch. 3, #2) In cold weather, the subgrade soil must be free of _____
before concrete placing begins.
✔✔False(Water can be sprinkled on the subgrade or subbase before concreting, but it
*shouldn't* result in puddles on the surface or soft, muddy spots.) - ✔✔(Ch. 3, #3) True
or False: Before a concrete slab on ground is placed under severe drying conditions
that threaten plastic shrinkage cracking, water should be sprayed on the subgrade until
puddles are formed and the surface is soft.
✔✔measuring down from a straightedge spanning between the side forms - ✔✔(Ch. 3,
#4) Before concreting, workers should check the elevation of the subbase by:
✔✔False (If the surface is too low, it will be thicker and require more concrete than
anticipated) - ✔✔(Ch. 3, #5) If the surface for a subbase for a concrete slab on ground
is too low, the slab is likely to be too thin.
✔✔Checkerboard (recommended methods include adjacent and alternate lanes) -
✔✔(Ch. 3, #6) Which one of the placing sequences for casting slabs-on-ground is *not*
recommended?
✔✔form setting and screeding - ✔✔(Ch. 3, #7) Which has the greatest effect on floor
levelness?
✔✔False (There should be no holes in the sheet, as these will expose the underside of
the slab to moisture that can seep through any cracks or joints.) - ✔✔(Ch. 3, #8) True or
False: When concrete will be placed directly on a vapor retarder, finishers should use a
margin trowel to punch holes in the vapor retarder and thus decrease waiting time
before the concrete can be finished.
✔✔placing a 3-in. (75mm) thick layer of compactible manufactured sand (containing
rock dust) on the vapor retarder before concrete placement - ✔✔(Ch. 3, #9) When
,specifications don't require the concrete slab to be in direct contact with the vapor
retarder, the preferred method for reducing potential problems caused by slab curling is:
✔✔keeping any slab cracks tightly closed - ✔✔(Ch. 3, #10) The primary function of
welded wire reinforcement in slabs-on-ground that are considered unreinforced is:
✔✔Reinforcing steel be discontinued (cut) so it doesn't pass through the joint, or that
every other bar or wire be discontinued (cut) so only half the steel passes through the
joint. - ✔✔(Ch. 3, #11) Instructions for drawings for slabs-on-ground may require that:
✔✔True - ✔✔(Ch. 3, #12) True or False: Reinforcing steel should be located at or
above mid-depth of slabs on ground so cracks will remain tightly closed at the surface.
✔✔steel dowels - ✔✔(Ch. 3, #13) Load transfer at construction joints can be provided
by smooth _____ ______ or other types of load transfer devices.
✔✔6 - ✔✔(Ch. 3, #14) Keyed construction joints are not recommended for slabs subject
to heavy wheel traffic or for slabs less than ____ in. thick.
✔✔floor flatness - ✔✔(Ch. 4, #1) Measuring the gap under a 10-ft straightedge is one
way of determining:
✔✔the location under the 10-ft straightedge that is between the two high spots where
the straightedge is resting. - ✔✔(Ch. 4, #2) The gap under a straightedge should be
measured at:
✔✔floor flatness and levelness - ✔✔(Ch. 4, #3) The F-number system is one way of
determining:
✔✔True - ✔✔(Ch. 4, #4) True or False: F(f) numbers are indicators of floor surface
smoothness or flatness.
✔✔True - ✔✔(Ch. 4, #5) True or False: F(l) numbers are indicators of levelness or tilt of
the floor surface.
✔✔Floating, restraightening, troweling - ✔✔(Ch. 4, #6) Which finishing operations affect
floor flatness?
✔✔flat but not level - ✔✔(Ch. 4, #7) A floor with an F(f) value of 48 and an F(l) value of
16 is:
✔✔a lot of finishing effort needed to get a high F(f) number floor - ✔✔(Ch. 4, #8) A 3-in.
(75mm)-slump concrete that sets very fast is most likely to result in:
, ✔✔24; 72 - ✔✔(Ch. 4, #9) F-number testing should preferably be done within ____
hours after concrete placement, but never later than ____ hours after concrete
placement.
✔✔True - ✔✔(Ch. 4, #10) True or False: A floor with an F(f) number of 40 is twice as
flat as a floor with an F(f) number of 20.
✔✔False (Measurements after 72 hours may reflect other influences, such as slab
curling, that affect flatness or levelness but are beyond the finisher's control.) - ✔✔(Ch.
4, #11) True or False: Floor flatness measurements taken more than 72 hours after
concrete placement are the best measure of the finishers' skills.
✔✔10 to 20 ft (3 to 6 m) apart - ✔✔(Ch. 4, #12) The highest quality of levelness can be
achieved by using hard edge forms spaced:
✔✔Trucks must drive over sidewalks, curbs, or driveways; Slab reinforcing bars are
supported by chairs; truck tires leave deep ruts in the subgrade or granular base. -
✔✔(Ch. 5, #1) If the ready mix truck can be driven into the slab placement area, chuting
concrete directly into the forms is usually the easiest and most economical placing
method. This may not be possible when:
✔✔cracking - ✔✔(Ch. 5, #2) Although placing concrete directly from the truck is
economical, getting the truck to the discharge point may require driving it over curbs, or
on sidewalks or driveways. To avoid ________ of the curbs, sidewalks, or driveways,
earth ramps may need to be built.
✔✔6 - ✔✔(Ch. 5, #3) When guiding a concrete truck near a 6-ft (2 m)-deep excavation,
the truck wheels closest to the excavation should be ____ ft (m) or more away from the
edge of the excavation.
✔✔True - ✔✔(Ch. 5, #4) True or False: When the concrete truck chutes won't reach the
forms, the concrete supplier must approve adding more chutes supported off the truck.
✔✔plywood ramp - ✔✔(Ch. 5, #5) Manual or motorized buggies can be used to
transport concrete from the truck mixer to the point of deposit, but a temporary
________ ________ is usually needed to prevent the buggies from riding directly on
any reinforcing bars.
✔✔personnel; travel - ✔✔(Ch. 5, #6) When concrete is placed by crane and bucket,
buckets must never be lifted over __________ or over ______ paths.
✔✔height restrictions - ✔✔(Ch. 5, #7) Truck-mounted conveyors are especially useful
on jobs with ______ __________ such as warehouse slabs when the building is
enclosed prior to placement.
