ACI CONCRETE FINAL PAPER UPDATED
QUESTIONS VERIFIED COMPLETE
ANSWERS 100 PERCENT CORRECT
◉ 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:
◉ bleed water; 1/4
Answer: (Ch. 7, #18) Concrete is ready for floating when the ________
________ sheen is gone and the finisher can walk on the slab leaving
only about a ____ inch deep footprint.
◉ True
Answer: (Ch. 7, #19) True or False: While machine floating, if the
machine digs in or disrupts the level of the surface, stop floating and
wait until the concrete surface is stiffer.
◉ False (If concrete is setting slowly, floating should be done as late
as possible(when a finisher's footprint is barely perceptible)).
Answer: (Ch. 7, #20) True or False: If concrete is setting slowly,
floating should be done when the finisher's footprint is 1/2 in. or
more.
, ◉ floating; floated
Answer: (Ch. 7, #21) Troweling follows immediately after _________,
and no troweling should ever be done unless the surface has first
been _________.
◉ True
Answer: (Ch. 7, #22) True or False: When hand finishing, finishers
usually float and then steel trowel an area before moving their knee
boards.
◉ tilting the trowel blade too much or too soon
Answer: (Ch. 7, #23) Chatter or washboard marks on a finished
surface are caused by:
◉ perpendicular
Answer: (Ch. 7, #24) The direction of the first machine floating pass
should be __________ to the direction of the last finishing procedure.
◉ creates waves that grow larger with repeated passes of the
machine.
Answer: (Ch. 7, #25) Machine floating or troweling of slabs is
typically done in two directions-- parallel and perpendicular to the
side forms. Floating or troweling in only one direction:
QUESTIONS VERIFIED COMPLETE
ANSWERS 100 PERCENT CORRECT
◉ 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:
◉ bleed water; 1/4
Answer: (Ch. 7, #18) Concrete is ready for floating when the ________
________ sheen is gone and the finisher can walk on the slab leaving
only about a ____ inch deep footprint.
◉ True
Answer: (Ch. 7, #19) True or False: While machine floating, if the
machine digs in or disrupts the level of the surface, stop floating and
wait until the concrete surface is stiffer.
◉ False (If concrete is setting slowly, floating should be done as late
as possible(when a finisher's footprint is barely perceptible)).
Answer: (Ch. 7, #20) True or False: If concrete is setting slowly,
floating should be done when the finisher's footprint is 1/2 in. or
more.
, ◉ floating; floated
Answer: (Ch. 7, #21) Troweling follows immediately after _________,
and no troweling should ever be done unless the surface has first
been _________.
◉ True
Answer: (Ch. 7, #22) True or False: When hand finishing, finishers
usually float and then steel trowel an area before moving their knee
boards.
◉ tilting the trowel blade too much or too soon
Answer: (Ch. 7, #23) Chatter or washboard marks on a finished
surface are caused by:
◉ perpendicular
Answer: (Ch. 7, #24) The direction of the first machine floating pass
should be __________ to the direction of the last finishing procedure.
◉ creates waves that grow larger with repeated passes of the
machine.
Answer: (Ch. 7, #25) Machine floating or troweling of slabs is
typically done in two directions-- parallel and perpendicular to the
side forms. Floating or troweling in only one direction:
