GATE CE topic:highway-pavements PYQs & Answers — Page 3

Questions 21–30 of 30. Imported answers require independent review unless marked reviewed.

Structural failures considered in the mechanistic method of bituminous pavement design are

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Fatigue and Rutting

Fatigue and Shear

Rutting and Shear

Shear and Slippage

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An isolated concrete pavement slab of length

is resting on a frictionless base. The temperature of the top and bottom fibre of the slab are

and

, respectively. Given: the coefficient of thermal expansion =

and the elastic modulus =

. Assuming

and the unit weight of concrete as zero, the maximum thermal stress is calculated as

Your answerChoose one option.

zero

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A flexible pavement has the following class of loads during a particular hour of the day. i. 80 buses with 2-axles (each axle load of 40 kN) ii. 160 trucks with 2-axles (front and rear axle loads of 40 kN and 80 kN, respectively)

The equivalent standard axle load repetitions for this vehicle combination as per IRC:37-2012 would be

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180

240

250

320

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Tie bars of 12 mm diameter are to be provided in a concrete pavement slab. The working tensile stress of the tie bars is 230 MPa, the average bond strength between a tie bar and concrete is 2 MPa, and the joint gap between the slabs is 10 mm. Ignoring the loss of bond and the tolerance factor, the design length of the tie bars (in mm, round off to the nearest integer) is ________.

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A bitumen sample has been graded as VG30 as per IS : 73-2013. The ‘30’ in the grade means that

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penetration of bitumen at 25°C is between 20 and 40

viscosity of bitumen at 60°C is between 2400 and 3600 Poise

ductility of bitumen at 27°C is more than 30 cm

elastic recovery of bitumen at 15°C is more than 30%

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As per IRC:37-2012, in order to control subgrade ruting in flexible pavements, the parameter to be considered is

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horizontal tensile strain at the bottom of bituminous layer

vertical compressive strain on top of subgrade

vertical compressive stress on top of granular layer

vertical deflection at the surface of the pavement

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The initial concavity in the load-penetration curve of a CBR test is NOT due to

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uneven top surface

high impact at start of loading

inclined penetration plunger

soft top layer of soaked soil

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Given the following data: design life n = 15 years, lane distribution factor D = 0.75, annual rate of growth of commercial vehicles r = 6%, vehicle damage factor F = 4 and initial traffic in the year of completion of construction = 3000 Commercial Vehicles Per Day (CVPD). As per IRC:37-2012, the design in terms of cumulative number of standard axles (in million standard axles, up to two decimal places) is _____

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The following observations are made while testing aggregate for its suitability in pavement construction:

i. Mass of oven-dry aggregate in air = 1000 g ii. Mass of saturated surface-dry aggregate in air = 1025 g iii. Mass of saturated surface-dry aggregate under water = 625 g

Based on the above observations, the correct statement is

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bulk specific gravity of aggregate = 2.5 and water absorption = 2.5%

bulk specific gravity of aggregate = 2.5 and water absorption = 2.4%

apparent specific gravity of aggregate = 2.5 and water absorption = 2.5%

apparent specific gravity of aggregate = 2.5 and water absorption = 2.4%

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The radii of relative stiffness of the rigid pavements P and Q are denoted by

and

, respectively. The geometric and material properties of the concrete slab and underlying soil are given below:

Pavement	Thickness of Slab	Subgrade Reaction Modulus
	Concrete	Soil
P
Q

The ratio (up to one decimal place) of

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GATE CE topic:highway-pavements PYQs

Question 11

Question 12

Question 34

Question 48

Question 14

Question 17

Question 18

Question 54

Question 32

Question 54