Explain camber. What are the objectives of camber? Discuss the factors on which amount of camber depends.
[3 marks]Briefly explain: Tyre pressure, contact pressure, rigidity factor, ESWL
[4 marks]Discuss the MORTH requirements of WMM, DBM, BC, SDBC mixes for pavement.
[7 marks]What is road safety audit? Show its process with flow chart.
[3 marks]Why extra widening shall be provided on the horizontal curve of highway? Derive its necessary expression.
[4 marks]Design following geometric elements on horizontal curve for the ruling design speed of 80 kmph. Ruling minimum radius, Super elevation, Extra widening, Length of transition curve, SSD, ISD, and set-back distance.
[7 marks]An ascending gradient of 1:50 meets a descending gradient of 1:80. Determine the length of summit curve to provide ISD and OSD, for a design speed of 90 kmph. Assume all other data.
[7 marks]Explain special points to be considered while road construction in black cotton soil.
[3 marks]The speed-density relationship of traffic on a section of a freeway lane was estimated to be vx = 17.5 ln (225/k) as per Greenberg’s model. (a) Find flow, speed and density at Maximum flow, (b) Find jam density.
[4 marks]The loaded wt. on the rear dual wheels of a truck is 5500 kg. The c/c spacing and clear space in the dual wheels are 30 cm and 10 cm respectively. Calculate the ESWL for pavement thickness of
[7 marks]20 cm (ii ) 35 cm (iii) 50 cm
[ marks]What are the parameters required as the input for pavements analysis?
[3 marks]Explain with sketches Speed-Flow-Density relationships. Derive Greenshield’s equations for maximum flow condition.
[4 marks]Calculate the stresses at interior, edge and corner region of cement concrete pavement using Westergaard’s stress equations. Take wheel load = 4100 kg, Ec = 3 x 105 kg/cm2 , Pavement thickness = 20 cm, µ = 0.15, Modulus of subgrade reaction k = 5 kg/cm3, Radius of contact area = cm.
Describe with sketches failures in rigid pavements. Write the remedial measures for them.
[3 marks]Give detailed comparison between Highway and Runway pavements.
[4 marks]Asubgrade soil sample has following properties:1 Soil passing 200 no. sieve (0.074 mm) is 50 %, Liquid limit = 45 %, Plastic limit = 35 %. Design the pavement section by G.I. method for heavy traffic and compare the value of G.I. using the standard curves.
[7 marks]Describe with sketches failures in flexible pavements. Write the remedial measures for them.
[3 marks]Give detailed comparison between Flexible and Rigid pavements
[4 marks]Design a suitable bituminous pavement section for a two-lane road with a Single carriageway. The traffic expected is 600 commercial vehicles per day in both directions with average vehicle damage factor of 1.8. Design subgrade CBR is % and the assumed design life of the pavement is 12 years. Use Guidelines of IRC 37-2001.
[7 marks]How the speed and delay studies are carried out? What are its applications?
[3 marks]Define: Spot speed, Running speed, SMS, TMS.
[4 marks]From the following data of spot-speed study, draw graphs for frequency (%) –vs- Speed range and Cumulative frequency (%) - vs- Speed. Also, calculate: Modal speed, Median speed, TMS, SMS, speed to be used in geometric design, speed for traffic regulation, standard deviation, coefficient of variation. Speed 0-10 11- 21- 31- 41- 51- 61- 71- 81- range 20 30 40 50 60 70 80 90 (kmph) No. of 5 9 15 22 28 21 14 6 vehicles
[3 marks]Describe with sketches special considerations for Hill Roads construction.
[3 marks]Explain Origin and Destination study. What are the uses of it?
[4 marks]On the right angled crossing of four arm signalized intersection, design 4 phase signal cycle for the given data using Webster’s method and IRC recommendations. Assume, amber = 3 sec/phase, lost time = 2 sec/phase, saturation flow rate=600W [W= Width of approach (m)], pcu value for the left and right turning vehicles are 25% and 75% more respectively. All left (L), straight (S) and right (R) turning vehicles on an approach are allowed to depart simultaneously during a green interval. Road AB crosses road CD at right angle. Approach A B C D Width(m) 10 10 9 9 Turning L S R L S R L S R L S R Volume 400 900 300 300 800 150 100 480 60 120 450 60 (pcu/hr)
