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For the following questions answer them individually
Separation of water or water sand cement from a freshly mixed concrete isknown
bleeding
creeping
segregation
flooding
For road pavements, the cement generally used is
ordinary Portland cement
rapid hardening cement
low heat cement
blast furnace slag cement
Hydration of cement is due to chemical action of water with
Tricalcium silicate and dicalcium silicate
Dicalcium silicate and tricalcium aluminate
Tricalcium aluminate and tricalcium alumino ferrite
All option are correct
Internal friction between the ingredients of concrete, is decreased by using
less water
fine aggregates
rich mix
more water and coarse aggregates
In a slump test, each layer of concrete is compacted by a steel rod 60 cm longand of 16 mm diameter for
20 times
25 times
30 times
40 times
To prevent segregation, the maximum height of placing concrete is
100 cm
125 cm
150 cm
200 cm
The shuttering of a hall measuring 4 m x 5 m, can be removed after
5 days
7 days
10 days
14 days
For compacting plain concrete road surface of thickness less than 20 cm, we use
internal vibrator
screed vibrator
form vibrator
None of these
Pick up the correct statement from the following
Construction joints in columns are provided a few cm below the junction of beam
Construction joints in columns are provided at the bottom haunching
Construction joint in beams and slabs are provided within middle third
An excess of flaky particles in concrete aggregates
decreases the workability
increases the quantity of water and sand
affects the durability of concrete
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