STUPIDSID
Attempt any four
1 (a)
Determine the Equivalent Wheel Load Factor or VDF value of the following tho axle loads in terms of the standard axle load of 8.16 t.
a) LCV with rear axle load of 2.0t
b) Hev with rear axle load of 15.5t.
a) LCV with rear axle load of 2.0t
b) Hev with rear axle load of 15.5t.
5 M
1 (b)
Write short note on Different types of Airport.
5 M
1 (c)
Explain Present Serviceability Index (PSI)
5 M
1 (d)
Explain role of Labour v/s Machinery in road construction.
5 M
1 (e)
Calculate the thickness of an Airport flexible pavement per the U.S.C crop of Engineers method for an ESWL of 40.82 kg. Subgrade has a CBR of 6. The tyre pressure is 7kg/cm2
5 M
2 (a)
The spacing between the contraction joints of a CC pavement is 4.2m. Determine the tensile stress developed in the CC pavement due to contraction if the coefficient of friction between the bottom of the pavement and the supporting layer is 1.1 and the unit weight of CC is 2400Kg/cm3.
6 M
2 (b)
A cement concrete pavement has a thickness of 26cm and lane width of 3.5m. Design the tie bars along the longitudinal joints using the data given below;
Allowable working stress in steel tie bars Ss=1250kg/cm2
Unit weight of CC is 2400kg/cm3
co efficient of friction f=1.2
Allowable tensile stress in deformed tie bars Ss=2000kg/cm2
Allowable bond stress in deformed bars Sb=2406kg/cm2
Allowable working stress in steel tie bars Ss=1250kg/cm2
Unit weight of CC is 2400kg/cm3
co efficient of friction f=1.2
Allowable tensile stress in deformed tie bars Ss=2000kg/cm2
Allowable bond stress in deformed bars Sb=2406kg/cm2
14 M
3 (a)
A four lane divided highway carries initial traffic after completion of construction is 3500cvpd. The rate of growth of traffic is 6.5% per annum. The design life is 15 years, VDF is 5. CBR is 8% design the flexible pavement.
| CSA (msa) | Total Thick (mm) | Pavement Composition | ||
| Bitumonous surfacing | GBS (mm) | |||
| BC(mm) | DBM (mm) | |||
| 10 | 550 | 40 | 60 | Base=250 |
| 20 | 575 | 40 | 85 | |
| 30 | 590 | 40 | 100 | |
| 50 | 610 | 40 | 120 | Sub base=200 |
| 100 | 640 | 50 | 140 | |
| 150 | 660 | 50 | 160 | |
10 M
10 M
4 (a)
Design concrete pavement using FAA method for following condition
The design modulus of subgrade reaction 7kg/cm3. The average 90 day modulus of rupture is 42 kg/cm3 use 15cm cement trated base
| Aircraft type | Types of gear | Max load each main assembly (453.6) | No. of Departure |
| B-707 | Twin tandem | 157 | 60000 |
| B-737 | Twin | 76.9 | 200000 |
| B-747 | Double Twin Tandem | 166.5 | 20000 |
| DC-8 | Twin tandem | 148 | 50000 |
| DC-9 | Twin | 42.4 | 200000 |
| DC-10 | Twin tandem | 194 | 15000 |
| CV-880 | Twin tandem | 87 | 50000 |
The design modulus of subgrade reaction 7kg/cm3. The average 90 day modulus of rupture is 42 kg/cm3 use 15cm cement trated base
| Annual equivalent depatures of critical Aircraft | FOS |
| 1200 or less | 1.75 |
| 1200 to 3000 | 1.85 |
| 3000 to 6000 | 1.9 |
| Greater than 6000 | 2 |
12 M
4 (b)
Enlist the various design methods for rigid Airport pavement. Briefly explain PCA method.
8 M
5 (a)
Due to Increased traffic a thickness of 20cm of concrete pavement is required overlay. Calculate thickness of rigid overlay by using U.S Corps Engineers method over an existing concrete pavement when
i) Existing pavement is 10cm thick and is in good condition.
ii) Existing pavements is 10cm thick nut is badly cracked.
i) Existing pavement is 10cm thick and is in good condition.
ii) Existing pavements is 10cm thick nut is badly cracked.
10 M
5 (b)
Design a runway payment section for a wheel load of 27000kg with a type pressure of 11kg/cm2. For this purpose, the plate bearing test with 75 cm diameter was carried out soil subgrade and the plate yielded a pressure of 2 kg/cm2 at 0.5 cm deflection after ten load repetitions. Assume Base course constant K as 138.
10 M
6 (a)
Explain various distress in rigid pavement
10 M
6 (b)
Explain Benkelma ------------------at evaluation & strengthening.
10 M
7 (a)
Briefly explain step involved in inspection and quality control during construction.
10 M
Write short notes on
7 (b) 1)
Suitability of low coast roads.
5 M
7 (b) 2)
Pavement Management System.
5 M
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