Test 5 Flashcards
Horizontal an vertical tie off. What is the minimum rebar from inside the wall?
A) 1/8 inch
B) 1/4 inch
C) 1/2 inch
D) 3/4 inch
D) 3/4 inch
What is the minimum load bearing PSI for a residential building?
A) 1250 psi
B) 2000 psi
C) 2500 psi
D) 4500 psi
C) 2500 psi
What is the minimum support on structural wall?
A) 2 inches
B) 3 inches
C) 4 inches
D) 6 inches
C) 4 inches
Test cylinders. How many tests per day on 150 yards?
A) one
B) two
C) three
D) four
C) three
What is the overlap for filter fabric?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
C) 18 inches
When you have excessive bleeding in concrete what should you do?
A) add more sand
B) add more water
C) add more aggregate
D) broom off
A) add more sand
What is the minimum air entrainment on 5000 psi in concrete?
A) 1%
B) 2%
C) 3%
D) 4%
A) 1%
How much time do you have to place concrete into the forms after mixing?
A) 20 mins
B) 30 mins
C) 40 mins
D) 60 mins
B) 30 mins
How much coverage for concrete columns?
A) 1 inch
B) 1 1/4 inches
C) 1 1/2 inches
D) 1 3/4 inches
C) 1 1/2 inches
What is the minimum strength on high strength concrete?
A) 3000 psi or higher
B) 4000 psi or higher
C) 5000 psi or higher
D) 6000 psi or higher
D) 6000 psi or higher
Forklift joint spacing 36 times slab thickness wider than normal is what?
A) 6 ft on cover
B) 12 ft on cover
C) 18 ft on center
D) 24 ft on center
C) 18 ft on center
Guardrails or tie offs on platforms, what is the minimum height?
A) 30 inches
B) 36 inches
C) 42 inches
D) 48 inches
C) 42 inches
What do you put at each end of ceiling beams?
A) bar chair
B) step chair
C) chairs
D) support steps
A) bar chair
How many days to achieve comprehensive strength in concrete does it take?
A) 3
B) 10
C) 14
D) 28
D) 28
After concrete wall is complete, when do you backfill?
A) 28 days cold or hot
B) 3 days
C) 7 days warm temp
D) 7 days cold temp
C) 7 days warm temp
What is the temperature inside of a concrete slab? (curing process)
A) 40-50
B) 50-70
C) 75-90
D) 80-95
B) 50-70
Best grade of plywood for concrete forms?
A) B-B
B) A-C
C) HDO ply
D) MDO ply
C) HDO ply
When a contractor sends a crew out to do an excavating job and an inspector is on site, the following are true except,
A) call before you dig
B) written documents on site
C) remove hazardous
D) markings complete
B) written documents on site
What is the drop in a 10’ run with a 2% slope?
A) 2’5”
B) 2 ft
C) 3”
D) 4”
B) 2 ft
After concrete slab is poured what is the variation of temperature UNDER slab that concrete will start to crack?
A) 9%
B) 10%
C) 15%
D) 25%
C) 15%
How many workers are allowed on one safety line?
A) 1
B) 2
C) 3
D) 4
A) 1
What happens when you pour concrete directly on the forms?
A) causes forms to become weak
B) exposes aggregate
C) weakens shoring members
D) none of the above
B) exposes aggregate
What is the PSI for #11 steel rebar?
A) 40,000
B) 50,000
C) 30,000
D) 60,000
D) 60,000
When ordering concrete who is to specify if fly ash will go into concrete?
A) engineer
B) construction company
C) person ordering
D) drive
A) engineer
When building a concrete building what kind of metal is continually inspected?
A) wire mesh
B) V cut
C) hard metal
D) rebar
D) rebar
Who can make changes in ordering concrete?
A) worker at plant
B) engineer
C) contractor or person he selects
D) on one
C) contractor or person he selects
Using wire mesh in a slab will do what?
A) prevent cracking
B) nothing
C) reduce tensile strength
D) increase tensile strength
A) prevent cracking
According to OSHA fall protection is required above what height?
A) 6’
B) 8’
C) 10’
D) 12’
A) 6’
The kind of nails should you use when nailing forms together, but are easily removed?
A) double head/duplex
B) common
C) finishing nails
D) box nails
A) double head/duplex
How deep must a trench be before shoring or stepped back?
A) 5’
B) 6’
C) 8’
D) 12’
A) 5’
Which type of form is used for tall towers, silos, elevator shafts on tall buildings, and building walls?
A) slip forms
B) jump forms
C) gang forms
D) tunnel forms
A) slip forms
Of the five basic types of Portland cement, which is high-early strength cement?
A) Type I
B) Type II
C) Type III
D) Type IV
C) Type III
What is the best material to place concrete on?
A) solid rock
B) crushed rock
C) sand
D) dirt
A) solid rock
When using a portable ladder how far out a trench or above any surface must a ladder extend?
A) 1’
B) 2’
C) 3’
D) 5’
C) 3’
On a 28’ ladder, how far from the wall must base be?
A) 3’
B) 4’
C) 6’
D) 7’
D) 7’
Where is WWF used in concrete slabs?
A) at bottom for tensile strength
B) at top to control cracking
C) at top for tensile and structural
D) none of the above
B) at top to control cracking
What are the markings on rebar?
A) mil, bar, size, steel type, grade
B) grade, steel type, bar size, mil
C) bar size, steel type, grade, mil
D) steel type, grade, bar size, mil
A) mil, bar, size, steel type, grade
What is the purpose of using deformed bars in concrete?
A) better bond with concrete
B) no difference
C) not recommended
D) cost efficient
A) better bond with concrete
How long can ready mix concrete sit in a truck before it should be used?
A) 1 hour
B) 1 1/2 hours
C) 2 hrs
D) 3 hrs
B) 1 1/2 hours
How long is it recommended before forms can be stripped from sides of beams and girders in absence of engineer?
A) 5 hrs
B) 24 hrs
C) 12 hrs anytime
D) 12 hours consecutive time when temperature above 50 degrees
D) 12 hours consecutive time when temperature above 50 degrees
What is the minimum size for exposed aggregate?
A) 1/2 “
B) 3/4”
C) 1”
D) 1 1/2”
A) 1/2 “
What is the distance for non or low reinforcing slabs?
A) 5 to 10
B) 10 to 15
C) 12 to 25
D) 20 to 30
C) 12 to 25
When are forms affected most at a sustained temperature?
A) below 32
B) below 50
C) over 90
D) over 100
A) below 32
What is a rebar chair used for?
A) horizontal
B) vertical
C) bottom of footing to keep off rust
D) to hold reinforcing bars the specified distance from the inside surface of the form
D) to hold reinforcing bars the specified distance from the inside surface of the form
What is not a component of a safety line?
A) harness
B) pulley
C) bolts
D) bungy cord
C) bolts
On a beam on a suspended floor where should the saw be cut?
A) middle
B) middle third
C) middle quarter
D) north edge
B) middle third
When excavating a basement and water persists, which is the best for eliminating water?
A) trench box
B) trench around outside
C) trench through middle
D) well point
D) well point
When water proofing a wall, what is the minimum height past the water table you must go?
A) 4”
B) 6”
C) 8”
D) 12”
D) 12”
Which is the recommended lumber for forming?
A) treated
B) kin dried
C) partially seasoned
D) S and S lumber
C) partially seasoned
What is the best concrete to pump through a 5” line?
A) 4” slump, air entrained with fly ash
B) 6” slump, air entrained without fly ash
C) 4” slump, air entrained without fly ash
D) 6” slump, air entrained with fly ash
A) 4” slump, air entrained with fly ash
What is the best waterstop?
A) steel
B) pvc
C) rubber
D) none of the above
B) pvc
Which of the following soil types proved excellent bearing for most foundations?
A) gravel mixed with sand or clay (hardpan)
B) sand and silt (compacted loam)
C) clay
D) dry sand
A) gravel mixed with sand or clay (hardpan)
If you add superplasticizers instead of water to concrete it will do what?
A) increases slump temporarily
B) decrease your slump
C) lowers strength
D) all of the above
A) increases slump temporarily
At what distance should equipment be stored from an open trench?
A) 4’
B) 6’
C) 2’
D) 1’
C) 2’
What aggregate is best for pumping concrete?
A) crushed stone
B) rounded stone/ river rock
C) sharp rocks
D) none of the above
B) rounded stone/ river rock
Oversanded mixes or mixes with very fine sands require what?
A) more water and may be sticky and hard to finish
B) less water and may be easier to finish
C) more sand
D) none of the above
A) more water and may be sticky and hard to finish
A retarder often causes what?
A) a reduction in early strength
B) an increase in early strength
C) nothing
D) pliability
A) a reduction in early strength
If shrinkage is a concern, a __ cement factor and __ aggregate should be used.
A) higher/lower
B) lower/higher
C) lower/larger
D) damp/dry
C) lower/larger
Fly ash can generally what?
A) improve workability
B) improve pumpability
C) improve finishability and sulfate resistance
D) all of the above
D) all of the above
Unpredictable or spotty set promotes what?
A) blisters
B) delamination of machine troweled slabs
C) A and B
D) none of the above
C) A and B
In addition to cooling, much of the effect of high temp, on strength and setting time can be offset by using a ___ cement with retarder or fly ash.
A) Type I
B) Type II
C) Type III
D) Type IV
B) Type II
Where a structure or the soil conditions would require an excessive spread of the footing base to carry the load, what are used?
A) drilled piers
B) driven piles
C) a and b
D) none of the above
C) a and b
Waterstops are strips of what?
A) metal
B) rubber
C) plastic
D) all of the above
D) all of the above
Basement walls depend on what?
A) first floor framing to help brace the top edge
B) shoring
C) rebar
D) footing
A) first floor framing to help brace the top edge
Then usual safety factor in form work design/eng is what?
A) 2:1
B) 1:2
C) 3:1
D) 1:3
A) 2:1
The min. safety factor in form work design/engineering including live loads and impact is;
A) 3:1
B) 2:1
C) 1:3
D) 1:2
A) 3:1
The minimum safety factor in form work design and engineering is __ for from hangers
A) 1:2
B) 2:1
C) 1:3
D) 3:1
B) 2:1
The best time to strip plastic lined forms is __ hours after the concrete is placed
A) 24
B) 48
C) 72
D) 12
A) 24
One of the primary uses of welded wire reinforcement is to allow what?
A) flow
B) backflow
C) air entrainment
D) extended control joint spacing in flatwork
D) extended control joint spacing in flatwork
The construction joint in a structural member must maintain bond between what?
A) the two concrete placement and not interrupt the reinforcement
B) the rebar
C) the joists
D) the forms
A) the two concrete placement and not interrupt the reinforcement
An isolation joint is used at any location where a wall __.
A) ends
B) starts
C) bends
D) meets a slab or independent wall
D) meets a slab or independent wall
Horizontal construction joints general practice is to limit concrete placement to what?
A) one story
B) two story
C) 20’
D) 40’
A) one story
Vertical construction joints in walls can nearly always be located where?
A) corners, edges of pilaster columns
B) middle
C) top and button
D) not allowed
A) corners, edges of pilaster columns
In an unreinforced wall, it is wise to place at least three smooth __ at the joint to align the sections of the wall.
A) 1/4 inch dowels
B) 1 inch dowels
C) 2 inch dowels
D) 1/2 inch dowels
D) 1/2 inch dowels
What are the longitudinal joints installed in pavement slabs to control cracking caused by temp. changes
A) control joints
B) isolation joints
C) construction joints
D) warping joints
D) warping joints
Planned cracks at contraction joints are induced by cutting into the slab to a depth of __ the slab thickness, or a min of __
A) 1/4 2”
B) 1/2 2”
C) 1/4 1”
D) 2 times 1/4”
D) 2 times 1/4”
Dampproofing beneath a concrete slab should be a min. of __ mil
A) 10
B) 8
C) 6
D) 4
C) 6
A common guideline for spacing contraction joints is to space them in feet aprox. __ times the slab depth in inches
A) 1 1/2
B) 3
C) 2
D) 2 1/2
D) 2 1/2
Air entrainment causes what concrete field problem?
A) surface voids
B) blistering
C) crazing
D) puttingh
A) surface voids
MIn. PSI concrete steps exposed to moderate weather?
A) 1000
B) 2500
C) 3000
D) 3500
C) 3000
How much does a 8x8x16 cinder block weigh?
A) 28 lbs
B) 32 lbs
C) 36 lbs
D) 26 lbs
A) 28 lbs
What is the max. time for a concrete truck to get to a jobsite?
A) 1/2 hour
B) 1 hour
C) 1 1/2 hours
D) 2 hours
C) 1 1/2 hours
When the total quantity of concrete is less than __ , strength tests are not required, when evidence of satisfactory strength is submitted and approved by the building official?
A) 50 yards
B) 25 yards
C) 75 yards
D) 100 yards
A) 50 yards
The ground water table is to be min. __ below the foundation?
A) 5 ft
B) 10 ft
C) 2 ft
D) 3 ft
A) 5 ft
When air entrainment is added to concrete, it could produce?
A) Crazing
B) Blistering
C) Scale
D) none of these
C) Scale
Steel mesh in concrete is added?
A) Near the top
B) Near the bottom to prevent surface cracks
C) in the center for structural integrity
D) to the bottom to resist tensile forces
D) to the bottom to resist tensile forces
When anchors are stressed, it is allowed to have its sleeve peeled back how much?
A) not allowed
B) to not impair tensile strength
C) 25%
D) 40%
B) to not impair tensile strength
WHen can you remove form boards when an engineer does not provide a time?
A) 8 hours
B) 12 hours
C) 16 hours
D) 24 hours
B) 12 hours
What is sand ratio in concrete?
A) 1 part cement, 2 parts sand, 4 parts aggregate
B) 2 parts cement, 1 part sand, 4 parts aggregate
C) 4 part cement, 2 parts sand, 2 parts aggregate
D) none of the above
A) 1 part cement, 2 parts sand, 4 parts aggregate
How much strength does concrete have to have before you can stretch tendons?
A) 25
B) 50
C) 75
D) none
C) 75
What is recommended protrusion of a tendon?
A) 12”
B) 15”
C) 20”
D) 6”
A) 12”
Placement drawings are for?
A) location for steel bars in concrete
B) location of trusses
C) location of steel placement
D) none
A) location for steel bars in concrete
Cement lap siding for exterior walls shall be __ thick?
A) 0.25
B) 0.40
C) 0.10
D) 0.35
A) 0.25
What is the verification of prestressed tendons?
A) periodic
B) continuous
C) welding chart
D) none of these
A) periodic
What is done to make pumping of concrete easier?
A) reduced sand content
B) add plasticizers
C) none of these
D) increased sand and rounded aggregate
D) increased sand and rounded aggregate
What is the min. reinforcement thickness for non bearing concrete walls?
A) 1”
B) 2”
C) 4”
D) 6”
C) 4”
What is the min. distance between anchors on foundation plates?
A) 2”
B) 4”
C) 6”
D) 8”
C) 6”
Min. footing depth below grade?
A) 12”
B) 8”
C) 10”
D) 18”
A) 12”
Min. overlap on lap splices?
A) 2”
B) 4”
C) 6”
D) 8”
C) 6”
Reinforcing deformation in steel bar surface allows for what?
A) better bond/anchorage
B) repurposing
C) strength
D) none of these
A) better bond/anchorage
