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GATE 2022 Rapid Revision Quiz 16

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Question 1

Consider the following statements regarding pavements:

1. Rigid pavements are more suitable than flexible pavements for stage construction.

2. Rigid pavements are more affected by temperature variations than flexible pavements.

3. In a flexible pavement, any deformation in the top layers is transferred to under laid layers; but, in rigid pavements, there is slab or beam action due to which any deformation is only in the top layer of the concrete slab.

Which of the above statements are correct?

Question 2

A wheel of a vehicle with load 4100 kg and tyre pressure of 6 kg/cm2 yields a deflection of 5mm in the pavement. Then the modulus of elasticity of the pavement will be ________ (in kg/cm2) (round of to 2 decimal places)

Question 3

Void ratio of cement, fine aggregates and coarse aggregates are 55%, 40% and 45% respectively. Design mix proportion 1 : 2 : 6 (by weight) with a water cement ratio of 0.5 is prepared. If bulk density of cement, fine aggregates and coarse aggregates are 1450 kg/m3, 1650 kg/m3 and 1600kg/m3 respectively. Then how many bags of cement are required for 1m3 production of fresh concrete ?

(Assume Air voids as 3% by volume of total fresh concrete and 1bag of cement = 50kg)

Question 4

Consider the following particulars in respect of a concrete mix design –

What shall be the wight of the coarse aggregate

Question 5

The number of cement bags required in making plain cement flooring in an area of size 4 × 5 m and 150mm thick using cement concrete of mix 1: 3: 6 is -

Question 6

If the load warping and friction stresses in a cement concrete slab are 218 N/mm2, 298 N/mm2 and 15 N/mm2 respectively. The critical combination of stresses during summer mid-day is -

Question 7

Determine the total thickness of flexible pavement (in mm) for a two-lane undivided carriage way using the following data:

Design CBR value of subgrade = 5.0%

Initial traffic on completion of construction = 300 commercial vehicles per day

Average growth rate = 5.0% per year

Design life = 10 years

Vehicle damage factor = 2.5

For CBR value of 5%, the total thickness of the pavement for different value of cumulative standard axles is given below:

Question 8

The maximum applied load on a cylindrical concrete specimen of diameter 150 mm and length 300 mm tested as per the split tensile strength test guidelines of IS 5816:1999 is 157 kN. The split tensile strength (in MPa, round off to one decimal place) of the specimen is
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