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WorksheetsDAY 48 WORKSHEET ITI (RCC -REINFORCEMENT DETAILS, CONCRETE MIXE
Total questions: 15
Worksheet time: 11mins
For mild steel plain bars, the standard “U” type hook requires a semicircular bend with an internal clear diameter equal to —
2 times bar diameter
3 times bar diameter
4 times bar diameter
6 times bar diameter
Which of the following conditions makes the anchorage length in compression equal to the development length?
Only when hooks are provided
Only when bends are avoided
Always, regardless of hooks or bends
Only when bars are deformed type
Steel formwork is preferred for repetitive works mainly because —
It provides higher friction
It absorbs moisture and prevents cracking
It can be reused many times with high rigidity
It is cheaper than timber per cycle
Failure of formwork is MOST commonly associated with —
Excess concrete curing
Early deshuttering and inadequate shore removal
Strong bracing but weak panels
Slow rate of concrete placement
Reinforced masonry is adopted primarily because —
It eliminates the need for mortar
It provides tensile resistance at low cost
It increases wall thickness significantly
It requires no special curing
Assertion (A): TMT bars (thermo-mechanically treated bars) conform to IS 1566. Reason (R): TMT bars are known for their strength and ductility.
A and R are true, and R explains A
A and R are true, but R does not explain A
A true, R false
A false, R true
In plywood formwork, the resin-coated sheet allows repeated use and gives a smooth finish to concrete.
True
False
The standard internal radius of bending for MS plain bars is (a) times the bar diameter.
For reinforced masonry, flat steel strips used in horizontal layers are commonly (a) mm × 2 mm in section.
Formwork cost can be up to – % of the cost of a concrete structure.
(a)
Vertical supports used under slab formwork, carrying head beams, are known as (a) .
The operation of removing the formwork is technically called (a) .
MATCH THE FOLLOWING
Development length in tension
Must satisfy LD as per IS 456
Hook length for plain bars
12ϕ for 180° hook (example)
Anchorage in compression
Short embedment length required in compr
Deformed bars
May be used without hooks for deformed b
MATCH THE FOLLOWING
Sheathing
Panel that shapes concrete
Props
Vertical supports to carry load
Bracing
Prevents shifting of form
Ties
Holds wall form sides together
The development length of a reinforcing bar increases when concrete grade is low because the design bond stress becomes (a) .
