GATE Questions & Answers of Highway Pavements Civil Engineering

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

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

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

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

i. Mass of oven-dry aggregate in air $ =1000\;g $

ii. Mass of saturated surface-dry agreegate in air $ =1025\;g $

iii. Mass of saturated surface-dry aggregate under water $ =625\;g $

Based on the above observations the correct statement is

The radii of relative stiffness of the rigid pavements P and Q are denoted by lP and lQ  , respectively. The geometric and material properties of the concrete slab and underlying soil are given below:

Pavement Concrete Soil

Length of
Slab

Breadth
of Slab

Thickness
of Slab

Modulus of
Elasticity

Poisson's
Ratio

Subgrade
Reaction
Moduls

P L B h E $\style{font-family:'Times New Roman'}\mu$ K
Q L B 0.5h E $\style{font-family:'Times New Roman'}\mu$ 2K

The ratio (up to one decimal place) of lP, /lQ  is ________________

During a forensic investigation of pavement failure, an engineer reconstructed the graphs P, Q, R and S, using partial and damaged old reports.

Theoretically plausible correct graphs according to the 'Marshall mixture design output' are

In the context of the IRC 58-2011 guidelines for rigid pavement design, consider the following pair of statements.

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?

The penetration value of bitumen sample tested at 25oC is 80. When this sample is heated to 60oC and tested again, the needle of the penetration test apparatus penetrates the bitumen sample by d mm. The value of d CANNOT be less than _____ mm.

Match the information related to tests on aggregates given in Group-I with that in Group-II

Group-I Group-II
P. Resistance to impact 1. Hardness
Q. Resistance to wear 2. Strength
R. Resistance to weathering action 3. Toughness
S. Resistance to crushing 4. Soundness

 

In Marshall method of mix design, the coarse aggregate, fine aggregate, fines and bitumen having respective values of specific gravity 2.60, 2.70, 2.65 and 1.01, are mixed in the relative proportions (% by weight) of 55.0, 35.8, 3.7 and 5.5 respectively. The theoretical specific gravity of the mix and the effective specific gravity of the aggregates in the mix respectively are :