GATE CE 2022: HIGHWAY ENGINEERING : 66

Given the following data: design life lane distribution factor annual rate of growth of commercial vehicles vehicle damage factor and initial traffic in the year of completion of construction = 3000 Commercial Vehicles Per Day (CVPD). As power IRC : 37-2012, the design traffic in terms of cumulative number of standard axles (in million standard axles, up to two decimal places) is _________

A soil subgrade has following data;

1) Soil passing 75μ sieve is 55%

2) liquid limit= 40%

3) Plastic limit=20%

then Group index will be

For a design speed of 80 kmph, if the deviation angle of a valley curve is , then the length of the curve for comfort condition is nearly:

The following data pertains to the number of commercial vehicles per day for the design of a flexible pavement for a national highway as per IRC : 37-1984

Assuming a traffic growth factor of 6.5% per annum for both the types of vehicles, the cumulative number of standard axle load repetitions (in million) for a design life of 15 years is

Find the radius of equivalent resisting section, using Westergaard’s equations, using the following data:

Wheel load = 4000 kg

Radius of contact area = 11 cm

Modulus of elasticity of cement concrete, E = 3.3 x 10⁵ kg/cm²

Modulus of subgrade reaction, k = 25 kg/cm³

Poisson’s ratio of subgrade = 0.14

Pavement thickness = 16 cm

If value of E for pavement and subgrade is 20 MPa and deflection for flexible and rigid pavement is 6mm and 9 mm, respectively, then the ratio of deflection factor at the surface of a flexible pavement to the deflection factor at the surface of rigid surface, due to a wheel load of 35 kN and tyre pressure of 0.7 MPa, is ________.(round off to two decimal places)