Group index method of design of flexible pavement is_______________?
(A) a theoretical method
(B) an empirical method based on physical properties of subgrade soil
(C) an empirical method based on strength characteristics of subgrade soil
(D) a semi empirical method
Softening point of bitumen to be used for read construction at a place where maximum temperature is 40° C should be______________?
(A) less-than 40°C
(B) greater than 40°C
(C) equal to 40°C
(D) none of the above
Bitumen of grade 80/100 means______________?
(A) its penetration value is 8 mm
(B) its penetration value is 10 mm
(C) its penetration value is 8 to 10 mm
(D) its penetration value is 8 to 10 cm
Which of the following represents hardest grade of bitumen ?
(A) 30/40
(B) 60/70
(C) 80/100
(D) 100/120
The ductility value of bitumen for suitability in road construction should not be less than____________?
(A) 30 cm
(B) 40 cm
(C) 50 cm
(D) 60 cm
The maximum allowable Los Angeles abrasion value for high quality surface course is_______________?
(A) 10%
(B) 20 %
(C) 30%
(D) 45 %
Tie bars in cement concrete pavements are at______________?
(A) expansion joints
(B) contraction joints
(C) warping joints
(D) longitudinal joints
Rigidity factor for a tyre pressure greater than 7 kg/cm2 is_______________?
(A) equal to 1
(B) less than 1
(C) greater than 1
(D) zero
Select the correct statement______________?
(A) More the value of group index, less thickness of pavement will be required
(B) More the value of CBR, greater thickness of pavement will be required
(C) Minimum and maximum values of group index can be 0 and 20 respectively
(D) all of the above
Tyre pressure influences the______________?
(A) total depth of pavement
(B) quality of surface course
(C) both the above
(D) none of the above