ACI FLATWORK EXAM UPDATED ACTUAL
QUESTIONS WITH ACCURATE ANSWERS
AND FULL SOLUTION
⩥ Make sure there is always enough concrete ahead of the straightedge..
Answer: (Ch. 7, #2) How can workers avoid low spots when using hand-
operated straightedges?
⩥ wet screeds.
Answer: (Ch. 7, #3) Hand-held vibrating screeds are often useful when
striking off concrete with __________ _________.
⩥ True.
Answer: (Ch. 7, #4) True or False: Vibrating screeds should be moved
forward as fast as proper consolidation allows to avoid bringing too
much mortar to the surface.
⩥ darby; bull float.
Answer: (Ch. 7, #5) On slabs with many protruding pipes, a _______
works better than a ______ ________ for smoothing the surface.
⩥ immediately after screeding.
Answer: (Ch. 7, #6) Bull floating is done:
,⩥ sealing.
Answer: (Ch. 7, #7) When using a magnesium bull float, leaving a small
unfloated section and waiting for bleed water in that section can help
determine if the magnesium float is ________ the surface.
⩥ right angles; 45.
Answer: (Ch. 7, #8) Highway straight edges are used in cutting and
filling concrete surfaces at either ______ ________ or ____ degrees to
the construction joint.
⩥ dusting; crazing.
Answer: (Ch. 7, #9) Floating and troweling a concrete slab too soon is
likely to cause __________ and __________.
⩥ paste.
Answer: (Ch. 7, #10) Removing bleed water by dragging a heavy rubber
hose across the slab, or with a squeegee should be done only when
water, not _______ is removed.
⩥ sidewalks and driveways.
Answer: (Ch. 7, #11) Edging at side forms is most commonly done on:
⩥ edging.
, Answer: (Ch. 7, #12) Use a pointed trowel with a vertical sawing motion
to loosen concrete from the side form before _______.
⩥ flat; tilted up.
Answer: (Ch. 7, #13) An edger is placed _____ on the concrete surface
and then _______ ____ slightly in the direction the tool is moved.
⩥ False (edging should be started about 2-3 ft *away* from the corner.
Too much pressure can cause a downturn at the corner.).
Answer: (Ch. 7, #14) True or False: When edging, start at the corner of
the slab and apply maximum pressure to ensure that corners will not
chip or spall.
⩥ True.
Answer: (Ch. 7, #15) True or False: Edging and jointing is not required
on most floors and should not be done unless specified.
⩥ is occasionally required for interior flatwork.
Answer: (Ch. 7, #16) A fine broom finish:
⩥ Embed large aggregate particles beneath the surface mortar layer;
remove slight humps to produce a plane, level surface; compact and
further consolidate the surface in preparation for other finishing.
Answer: (Ch. 7, #17) After the waiting period, floating is done to:
QUESTIONS WITH ACCURATE ANSWERS
AND FULL SOLUTION
⩥ Make sure there is always enough concrete ahead of the straightedge..
Answer: (Ch. 7, #2) How can workers avoid low spots when using hand-
operated straightedges?
⩥ wet screeds.
Answer: (Ch. 7, #3) Hand-held vibrating screeds are often useful when
striking off concrete with __________ _________.
⩥ True.
Answer: (Ch. 7, #4) True or False: Vibrating screeds should be moved
forward as fast as proper consolidation allows to avoid bringing too
much mortar to the surface.
⩥ darby; bull float.
Answer: (Ch. 7, #5) On slabs with many protruding pipes, a _______
works better than a ______ ________ for smoothing the surface.
⩥ immediately after screeding.
Answer: (Ch. 7, #6) Bull floating is done:
,⩥ sealing.
Answer: (Ch. 7, #7) When using a magnesium bull float, leaving a small
unfloated section and waiting for bleed water in that section can help
determine if the magnesium float is ________ the surface.
⩥ right angles; 45.
Answer: (Ch. 7, #8) Highway straight edges are used in cutting and
filling concrete surfaces at either ______ ________ or ____ degrees to
the construction joint.
⩥ dusting; crazing.
Answer: (Ch. 7, #9) Floating and troweling a concrete slab too soon is
likely to cause __________ and __________.
⩥ paste.
Answer: (Ch. 7, #10) Removing bleed water by dragging a heavy rubber
hose across the slab, or with a squeegee should be done only when
water, not _______ is removed.
⩥ sidewalks and driveways.
Answer: (Ch. 7, #11) Edging at side forms is most commonly done on:
⩥ edging.
, Answer: (Ch. 7, #12) Use a pointed trowel with a vertical sawing motion
to loosen concrete from the side form before _______.
⩥ flat; tilted up.
Answer: (Ch. 7, #13) An edger is placed _____ on the concrete surface
and then _______ ____ slightly in the direction the tool is moved.
⩥ False (edging should be started about 2-3 ft *away* from the corner.
Too much pressure can cause a downturn at the corner.).
Answer: (Ch. 7, #14) True or False: When edging, start at the corner of
the slab and apply maximum pressure to ensure that corners will not
chip or spall.
⩥ True.
Answer: (Ch. 7, #15) True or False: Edging and jointing is not required
on most floors and should not be done unless specified.
⩥ is occasionally required for interior flatwork.
Answer: (Ch. 7, #16) A fine broom finish:
⩥ Embed large aggregate particles beneath the surface mortar layer;
remove slight humps to produce a plane, level surface; compact and
further consolidate the surface in preparation for other finishing.
Answer: (Ch. 7, #17) After the waiting period, floating is done to:
