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 l_{P} and l_{Q} , respectively. The geometric and material properties of the concrete slab and underlying soil are given below:
Length of Slab
Breadth of Slab
Thickness of Slab
Modulus of Elasticity
Poisson's Ratio
Subgrade Reaction Moduls
The ratio (up to one decimal place) of l_{P}, /l_{Q} 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 25^{o}C is 80. When this sample is heated to 60^{o}C 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
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 :