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WorksheetsDAY 45 WORKSHEET ITI (Concrete TECHNOLOGY)
Total questions: 15
Worksheet time: 12mins
In concrete mix design, a higher fineness modulus of fine aggregate indicates —
Finer sand and higher workability
Coarser sand and reduced cement demand
Poorly graded sand
Excessive silt content
If 5–8% of water increases the volume of sand by 20–40%, the phenomenon is known as —
Segregation
Bleeding
Bulking of sand
Creep
When concrete is placed from a height greater than 1.5 m, the most likely defect is —
Honeycombing
Segregation
Creep
Shrinkage
Which of the following tests is most suitable for very dry concrete mixes used in precast works?
Slump test
Compaction factor test
Vee–Bee consistometer test
Flow test
Which type of curing is best suited for precast concrete members produced in factories?
Membrane curing
Ponding
Steam curing
Electrical curing
Superplasticizers can reduce water content up to 15%.
True
False
Workability of concrete increases with an increase in angularity of coarse aggregates.
True
False
Assertion (A): Machine mixing produces more uniform concrete than hand mixing. Reason (R): Because rotation and tumbling in drum mixers ensure uniform coating of cement paste on aggregate surfaces.
Both A and R are true, and R is the correct explanation of A
Both A and R are true, but R is not the correct explanation
A is true, R is false
Both A and R are false
The maximum size of aggregate used for RCC work is __________ mm, while for PCC work it is __________ mm.
(a)
As per IS 456, the pH value of mixing water for concrete shall not be less than (a) .
In concrete compaction, 5 % voids can reduce the strength of concrete by about (a) %.
The ratio of partially compacted to fully compacted concrete weights is called __________.
The equation for target mean strength in mix design is given by f′ck = fck + (a) × s
MATCH THE FOLLOWING
Segregation
Separation of ingredients due to imprope
Bleeding
Water collecting on the concrete surface
Shrinkage
Evaporation of moisture causing volume r
Creep
Long-term deformation under sustained lo
MATCH THE FOLLOWING
Plasticizer
Improves workability by reducing water d
Retarder
Increases setting time of concrete
Accelerator
Speeds up setting in cold weather concre
Air-entraining agent
Introduces tiny air bubbles in concrete
