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**Question 1. 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 [2019 : 2 Marks, Set-ll](a) 250(b) 320(c) 180(d) 240Answer** (c)

N

L

Question 2. Structural failures considered in the mechanistic method of bituminous pavement design are [2019 : 1 Mark, Set-II]

(a) Fatigue and Rutting

(b) Fatigue and Shear

(c) Shear and Slippage

(d) Rutting and Shear

Answer:

Solution:

(a)

(b)

(c)

(d) Zero

Answer:

Solution:

Solution:

The ratio (up to one decimal place) of is _______.

Solution:

Relative stiffness,

I. Radius of relative stiffness is directly related to modulus of elasticity of concrete and inversely related to Poisson’s ratio.

II. Radius of relative stiffness is directly related to thickness of slab and modulus of subgrade reaction.

Which one of the following combinations is correct? [2016 : 1 Mark, Set-II]

(a) I. True; II. True

(b) I. False; II. False

(c) I. True; II. False

(d) I. False; II. True

Answer:

Solution:

As μ increases then 1 - μ

∴ Relative stiffness also increases.

∴ Statement 1 is false.

As modulus of subgrade reaction (k) increases, (I) decreases

∴ Statement 2 is false.

The design period of the road is 15 years, the yearly traffic growth rate is 7.5% and the load safety factor (LSF) is 1.3. If the vehicle damage factor (VDF) is calculated from the above data the design traffic (in million standard axle load, MSA) i s _________ . [2014 : 2 Marks, Set-I]

P. The temperature stresses will be zero during both day and night times if the pavement slab is considered weightless.

Q. The temperature stresses will be compressive at the bottom of the slab during night time if the self-weight of the pavement slab is considered.

R. The temperature stresses will be compressive at the bottom of the slab during day time if the self-weight of the pavement slab is considered

The TRUE statement(s) is(are) [2014 : 1 Mark, Set-I]

(a) P only

(b) Q only

(c) P and Q

(d) P and P only

Answer:

Solution:

(a) Tensile strength

(b) Compressive strength

(c) Flexural strength

(d) Shear strength

Answer:

Solution:

(a) 1.53

(b) 2.24

(c) 3.66

(d) 4.14

Number of commercial vehicles per day,

A = 4500

Annual traffic growth rate,

r = 8%

Design life,

n = 15 years

The cumulative standard axles,

N

Vehicle damage factor used

1. Warping stresses in cement concrete pavements are caused by the seasonal variation in temperature.

2. Tie bars are generally provided across transverse joints of cement concrete pavements.

The correct option evaluating the above statements is [2010 : 2 Marks]

(a) 1 true and 2 false

(b) 1 false and 2 true

(c) 1 true and 2 true

(d) 1 false and 2 false

Answer:

Solution:

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