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    TR 4

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    Rakesh Mahalik

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    © All Rights Reserved
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    TR 4

    Uploaded by

    Rakesh Mahalik
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    TR 4

    Uploaded by

    Rakesh Mahalik

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    of 3

    NATIONAL INSTITUTE OF TECHNOLOGY ROURKELA

    END -SEMESTER EXAMINATION, 2022


    SESSION: 2022 – 2023 (Autumn)
    B.Tech. 5th Semester

    Subject code: CE 3301 Subject Name: Transportation Engineering Dept. Code: CE


    No. of pages: 3 Full Marks: 50 Duration: 3 Hours

    ANSWER ALL QUESTIONS

    All parts of a question should be answered at one place.


    In case of any missing data, assume and state it clearly
    Q.No. Particulars Marks
    1 Explain Marshall method of mix design which should include discussion on: 5
    (a) Preparation of Specimen
    (b) Compaction and extraction procedure of specimen
    (c) density void analysis
    (d) Marshall stability and flow determination
    (e) determination of optimum binder content

    2 Elaborate CBR test on subgrade layer of flexible pavement 5

    3 Explain the following 2.5+2.5


    (a) Ductility test of bitumen
    (b) Softing point test of bitumen

    4 Explain the following 2.5+2.5


    (a) Fundamental diagram of traffic flow
    (b) On-street vehicle parking

    5 Explain the following: 2.5+2.5


    (a) Grade separated intersections
    (b) Transverse road markings

    6 Using the data given below, calculate the wheel load stresses at (a) interior (b) edge 5
    and (c) corner region of a cement concrete pavement using Westergaard’s stress
    equations.
    Wheel load = 5100 kg
    Modulus of elasticity of cement concrete = 3 × 105 kg/cm2
    Pavement thickness = 18 cm
    Poisson’s ratio of concrete = 0.15
    Modulus of subgrade reaction = 6.0 kg/cm3
    Radius of contact area = 15 cm

    1
    7 The parking survey data collected from a parking lot by license plate method is 5
    shown in the table below. Find the average occupancy, average turnover, parking
    load, parking capacity and efficiency of parking lot.

    Bay Time (Minutes)


    0-15 15-30 30-45 45-60
    1 1456 9813 - 5678
    2 1945 1945 1945 1945
    3 3473 5463 5463 5463
    4 3741 3741 9758 4825
    5 1884 1884 - 7594
    6 - 7357 - 7893
    7 - 4895 4895 4895
    8 8932 8932 8932 -
    9 7653 7653 8998 4821
    10 7321 - 2789 2789
    11 1213 1213 3212 4778
    12 5678 6678 7778 8888

    8A The speed-flow survey data is compiled and shown by the following table; find the 3
    time mean speed and space mean speed.
    No. Speed Range Volume of Flow
    1 2-5 1
    2 6-9 4
    3 10-13 0
    4 14-17 7
    8B It has been observed from field survey that 960 vehicles were occupied per 2
    kilometer length of the road segment under jammed condition in the morning peak
    hours. Also the free flow speed observed for the same road during night hours is
    100 kilometer per hour. Calculate the maximum traffic flow per hour that can occur
    on the road segment.

    9A The phase diagram with flow values of an intersection with three phases is shown
    in the figure below. The lost time and yellow time for the first phase is 4 and 4 3
    seconds respectively. For the second phase the lost time and yellow time are 3.5 and
    4 seconds respectively. For the third phase the lost time and yellow time are 2.5 and
    3 seconds respectively. If the cycle time is 150 seconds, show by sketches the time
    allocated to green, yellow and red for three phases. 300

    1000 400

    800 400

    Phase-1 Phase-2 600 Phase-3

    2
    9B Design the length and spacing of tie bars given that the pavement thickness is 20 cm 2
    and width of the road is 7 m with one longitudinal joint. The unit weight of concrete
    is 2400 kg/m3, the coefficient of friction is 1.5, allowable working tensile stress in
    steel is 1750 kg/cm2, and stress of deformed bars is 24.6 kg/cm2.

    10 Design the pavement for construction of a new flexible road with the following data 5
    and chart given:

    1. Two lane carriage way


    2. Initial traffic in the year of completion of construction = 400 CVPD
    (sum of both directions)
    3. Traffic growth rate = 7.5 %
    4. Design life = 15 years
    5.Vehicle damage factor based on axle load survey = 2.5
    (standard axle per commercial vehicle)
    6. Design CBR of subgrade soil = 4%.

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