Soc Conc Formwork Test Flashcards
What is cement?
The binding agent in concrete the bonds aggregate together.
Whay Is hydration?
The chemical reaction between cement and water.
What is the name of the funnel shape widening at the top of round column?
Capital
What type of reinforcement are in stalled with vertical rebars when erecting round columns?
Spirals
What is slab on grade?
Is the slab that is poured on the ground
What is the diameter of number 6 rebar?
3/4 of an inch
What form ties are designed so the form can be reattached?
Coil ties
What is the name of the process of extending existing foundation to lower levels of the undisturb soil?
Underpinning
Formwork openings are built strong enough to withstand external pressure, But simple enough for what?
Ease of stripping
Where on a Wall form is the greatest pressure exerted?
At the bottom
What is done to keep concrete from sticking to the forms?
Apply oil to the forms.
What is the correct consistency for dry pack grout?
Squeeze it in your hand and it holds its shape.
Which of the following best defines the term dome Pan?
A form used to shape concrete floors slabs and Joists in a waffle pattern.
What are batter boards used for?
What touch building lines to
What are the minimum dimensions for planks to be used as scaffolding decking?
2 x 10 x 8
What is the name for members that hold sections of a form in a straight horizontal line?
WALERS
What is the caisson?
I steel pipe place in the ground and filled with concrete.
What are the bases of column forms generally positioned with?
Templates
What is used when construction and isolation joint between concrete stairs and a sidewalk?
Asphalt impregnated strip
Is the greatest advantage of snap Ties?
They can easily be broken off with a concrete
Where is the best location to brace a column form?
Near the top
What is the slump test perform for?
To test a consistency of concrete
What purpose does a poly vapour barrier serve under a slab on grade?
Stop this love from absorbing moisture through capillary action from the soil below
What volume of concrete would be required for around column that is 12’ 6” high and has a 1’ 8” in diameter
1.01 yd³ or 0.772 Cubic metre
What does the monolithic approach to Formwork Eliminate?
Construction joint
After plumbing a wall form at both ends, What is the best way to straighten a wall?
Use a string line and 3 even thickness spacer blocks
What is the location of a properly install weeping tile?
Outside the footing and below the bottom of the basement slab.
Taper tires are install to secure form, what remains in the world after it is stripped?
No tie steel remains cast into the concrete
What is the correct way to brace a rectangular column to prevent it from twisting?
2 angle braces perside on 2 sides 90ﾟ to each other
Which is the correct sequence for using assembling prefabricated column forms?
Rebar, Form, Anchor bolt template.
What is the minimum anchor bolt diameter used in residential construction?
Half an inch Or 12 . 7 mm
What do screeds do?
Guide finished level of concrete
At what depth the does and excavated trench with vertical side requires a letter to access it?
4’
In what location can footings be on omittedd according to the building code?
There piers
A batterd wallis 10’ long, 6’ high, 3’ wide at base, And 2’ Wide that the top. How much concrete you need to feel this form?
5.56 yd³ or 4.248 m³
How are Anchor bolts held in position until concrete has set?
Using templates.
Which of the following components are placed in forms to make racesses for beams?
Block outs
When forming starirs, what should the riser be sloped?
Acts as nosing on the finished stair.
How our door and window openings made in concrete walls?
By setting Bucs into the forms at the required positions.
Without making any cuts, How many 2’ wide 8’ tall panels would it take to form the outside of a foundation wall measuring 30 ‘X50’ ?
80
What should be done after pouring concrete?
Maintain temperature of concrete between 10ﾟc and 25ﾟc
Which of the following can be used for laying out horizontal only angles and reading elevations?
Builders level
What will happen if too much extra water is added on site to a concrete mix?
It will Become weaker
Which of the following is used to shut off or stop a concrete pour in the wall?
BULK head
According to the OHSA, What is the minimum height at which guardrails be provided on a scaffold?
8’
What is a pilaster chamfer strip use for?
Keep corners from chipping
Use the following information to answer question regarding a suspended slab form:
Slab Thickness = 6”
Aluminum joist and Stringer depth = 6 1/2 inch each
Form ply thickness = 3/4 Inch
If the elevation at the top of the slab needs to be 104.475’ , what should the elevation be for your U-heads?
102.829’
Why are small removable sections provided at the bottom of forms?
To allow the form to be wash or blown out
What is the purpose of providing bleeder holes in concrete formwork?
It allows trapped air to scape and voice that can be reach with a vibrator to be filled.
Why are 3/4 inch square strips of wood sometimes use at inside corners of wall forms?
To keep stripping easier
What is the best way to level fly forms?
Builders level
A 20MX30M with rectangular building has a strip footing that is 600 mmwide and 200 Mm thick, With 200 MM thick wall centre on the footings. How many cubic metres of concrete will be required to build the footings?
11.9 m³
What is the last operation when forming concrete stairs?
Attaching riser forms
What is the minimum strength of concrete if it is to be used for our garage slab?
32MPA
What are spandrel ties use for?
Secure vertical perimeter form in position
What is the best description of ICF block’s?
FoAM face shells and plastic ties
How are tilted a form panels usually lifted by a crane?
Coils inserts
What is the correct forming procedure for suspended slab construction?
Mudsills, Screw jacks, Shoring frames, Cross braces, U heads, Stringers, Joist
How would you align the size of a slab and grade foundation form?
With a dry line
What should be done immediately following the placement of concrete into a column form?
Double check for plumb
Why should concrete not drop from too great a height?
It will caus the concrete to segregate
What allows fly forms to be leveled once they have Landed?
Screw jacks
At what point must proper steps be taken to cure a slab on grade foundation?
Immediately after finishing
Why is is important not to use too much form release agent?
If it drops into the rebar concrete will not bond to it
What must be done with old concrete splatter before flying a form safely?
Foms must be clean so concrete doesn’t fall from the form while it is moving
Why is grout using construction?
To fill voids and provide continuity between building elements
After placing a Concrete slab, Why would wet burlap Be used?
To control the rate of hybration by curing the concrete
What must be done after cutting a epoxy coated rebar
Go to edge of the rebar with liquid epoxy
What is done to prevent snap tie wedges from coming loose during a pour?
Firmly install with a hammer, Secure with a tack nail
When bracing the sides of an excavation, What is used to join steel soldier pile each other?
Wood lagging
What is asphalt-impregnated fibre-board used for in concrete for?
Expansion joint material
What is epoxy grout mostly commonly recommended for?
Corrosive environment
What are 3 Methods of rebar splicing
Lapped, Mechanical and Welded
What is the standard amount of time that it takes for concrete to reach its designated strength?
28 days
How many steps are required in step footing with total rise of 7’ -10 1/2” (2400mm)?
4
What is the first thing to once a tilt-up panel is raised before releasing the crane?
Attach braces and plumb
Given the following specifications:
Wall thickness = 200mm ( 7 7/8”)
Plywood thickness = 19mm (3/4”)
Waler Dimension =38mm x 89 mm (1 1/2” x 3 1/2”)
Strongback dimension = 89mm x 89mm (3 1/2” x 3 1/2”)
How long would you need to cut your spreaders?
200mm (7 7/8”)
Which is the proper sequence when installing champers strips into column forms?
Install chamfer strips, First Outside panel, Inside panel, then 2nd outside panel.
Why is a curing agent applied to concrete?
To control the rate of a Evaporation.
Which is the best method of releasing a form from green concrete?
Wooden wEdges
How is concrete placed into the slump cone when performing a slump test?
Place in thirds, Rodding 25 times for 3rd
What does the term ponding refer to in regards to placing concrete?
The total immersion of finish concrete in water to slow the rate of evaporation
How much concrete is required for a 4” thick pad with 13’ diameter?
1.64 yd³ or 1.26 m³
What should be installed at grade in preseved wood foundation PWF constuction?
12” wide pressure treated plywood
What is the best description of term “honeycombing”
A defect on the surface of concrete due to poor consolidation
Cracks are likely to happen in concrete. What kind of joint can be used to regulate where cracks will form?
Control joint
After the outside corners of the building have been located on batter boards, Next up would be to plumb down and _____
Measure to the outside of the footing
88.How much concrete would be required for a circular side walk
that is 3’ (914 mm) wide, 5” (125 mm) thick and has an inside
radius of 14’ (4267 mm)?
4.51 yd³ or 3.45 m³
When pouring a concrete stair, How can riser face be reposition if lateral deflections have taken place?
By using an Inverted Stringer, Watching the riser stock back to the being straight and then continuing the pour.
What is the purpose of putting a broom finish on a concrete surface?
To provide nonslipped surface
Which is the best method to prevent a blowout at outside corners of wall forms?
Lock the corner with the whalers and kickers
Where are spandrel beams located?
Perimeter walls
What are dropped panel supported by?
Columns
Which of the following is not an example of where you can use a slip form?
CAISSONS
What would normally support a grade beam?
Piers
What is a form liner used for?
To produce a textured surface
What additive is used on in concrete that will be exposed to freeze/thaw cycles?
Air entrainment
What can be installed at the construction joint to prevent water from leaking through the cracks at a bulk head?
Water stop
What is place at the base of a poured concrete Wall prevent slippage?
A key way
How should gang forms be controlled to prevent rotating while the crane is moving them?
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