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WorksheetsDay 56-Nov 18-Design of flexible pavement,Traffic eng.,maintanen
Total questions: 15
Worksheet time: 12mins
In flexible pavements, the load transfer mechanism primarily occurs through —
(a)
The minimum radius of a central island for a traffic rotary is —
Equal to entry radius
1.1 × entry radius
1.33 × entry radius
2 × entry radius
Rutting in a bituminous pavement is mainly caused by —
Under-inflation of tyres
Heavy channelized traffic
Lack of surface dressing
Poor drainage at edges
The deflection of flexible pavement as per Burmister method is proportional to —
p/a
p×a
a2/p
p/a2
Mud pumping in rigid pavements occurs due to —
Excess binder
Soil slurry ejected under wheel load
Frost action
Lack of lateral support
The minimum CBR value required for granular sub-base as per MOST for traffic >2 msa is —
10%
15%
20%
30%
Alligator cracking is due to insufficient binder content in surface course. Choose True or False.
True
False
1-Reflection cracks appear in flexible overlays laid over rigid pavements.
2- Bituminous binder loses ductility with age and becomes brittle.
Are these statements right?
(a)
Fill in the blank: The maximum wheel load recommended by IRC for a standard axle is (a) kN.
Fill in the blank: The traffic volume considered for design in India is the (a) highest hourly volume.
Fill in the blank: The defect in flexible pavement characterized by separation of binder from aggregates in presence of moisture is called (a) .
Fill in the blank: The relation between traffic flow, density and speed is expressed as q = (a) .
The most common method used for determining spot speed using mirrors at 45° is called the (a) method.
Match the following
PCU
Unit for expressing traffic heterogeneity
ADT
365-day average traffic
Safe speed limit
85th percentile speed
Jam density
Traffic density
For a flexible pavement, the following are given: Standard wheel load P = 3200 kg; subgrade CBR = 5%; tyre contact area is circular with radius a = 15 cm. Using the CBR design formula, find the required pavement thickness t in cm.
(a)
