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2 a., \\fnat are the various climatic factors that effect the design and performance of pavement?

Explain briefly. (08 Marks)

b. A dual wheel load assembly has 50kN load on each wheel with a contact pressure of 0.6 N/mm2.

If the clear gap between the two wheels is 300 mm, using the stress chart determine the vertical

stress values at a depth of 0.60 m due to dual wheel loads at stress points'as follows:i) Vertically below the centre of dual wheel load assembly

ji) Vertically below the centre of left wheel

iii) At radial distances of 0.60 m and 0.90 m from centre of left wheel towards other wheel.

Use chart in Fig. Q2(b). (12 Marks)

0 .1o

O J ' O J.O, .l o .6 0 J I J J

(f ,

~ ) ( 'O O ~~ J

1 45 6 ,S', I o-,

Z

3

4

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r ! ,II

( 1 ! i-nUlubers all

curves indicate ,~ .

r/a

'or -- ' f I.r,

i

L t .I

r 1

Fig. Q2(b)

3 a. Distinguish between Boussinesque's single layer theory and Burmister's two layer theory.(08 Marks)

b. ,A plate lo~ test conducted with 300mm diameter plate on'3ubgrade and on a pavement of

thickness 400mm sustained pressure of 0.10 N/mm2 and o A o N/mm2 respectively at 5mm

defle

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Fig. 3 (b)

4 a. Define ESWL. How ESWL is determined for dual wheel load assembly using equal strecriteriaand equal deflection criteria? Explainbriefly. (08 Marks)

b. Designthe pavement section by triaxial test method using thefollowing data:

Wheel load = 50 kN; Tyre pressure = 0.7 N/nun2; Traffic coefficient, x = 1.25; Rainf

coefficient, y = 0.90; design deflection, ~ = 2.5 nun; E value of -subgrade so

Es =10 N/mm2; E value of base course material, Eb =40 N/rnm2; E_value of 70 n im thic

bitumin~usconcrete, surface course = 100N/rnm 2 (12 Marks)

5 a. Explainbriefly how the following factors effectdesign of cement conCretepavements:i) Wheel loadandits repetitionsii) Subgrade strength and its propertiesiii) Propertiesofconcrete

iv) Temperaturevariations. (08 Marks)

b. - Calculate the warpi~g stresses at interior, edge and comer ror aconctete pavement othickness 200 mm with transverse joint at 4.0 m spacing. Thewidth'of slab is 3.7 m.Fo

,concrete E =3 X 104 N/mm2

and Jl= 0.15, k value for subgrade =0.06 N/mm3 Temperatudifferential is 0.9C per cm. Assume thermal coefficient ofconcrete as-10 x 10 -6 pero CAssumeradius ofloaded area as 150Ill..'l1.Usechart in Fig. Q5(b). (12 Marks).

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,

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Values ofLx /f and Ly if

6 a.' Explain step by step procedure for design orC.C ..pavement by IRC : 58-2002 for given axleload spectmm. (08 Marks)

b. Design the size and spacing of dowel bars at the expansion joints of C. C pavement of

thickness.2&Q mm with a radius of relative stiffness 900 mm for a wheel load of 60 k.i"

Assume: the load capacity of dowel system as 40% of the design wheel load. Joint widthis 20

.mm. Permissible shear and flexmal stresses in dowel bars are 100 N/mm2 aIld

140 N!mm.2 respectively and permissible bearing stresses in C.C as 10 Nhnm2 (12M~rks)

7 a.. Briefly explain structural evaluation and functional evaluation of pavements.

b. Explain briefly with neat sketches, folloiring type of flexible pavement

. mentioning causes and remedial or maintenance measures.

i) Alligator or map cracking

ii) Pot lwles

iii) Edge ~acking

iv)Reflectio.n cracking.

(OSM~ri

failures' 0)

8 Write'shm IJDteson:

a. RigicLpavem'el1tfailures

b. DesiID1'factOJisfor runway pavements

c. Equivalent. wheel load factor (EWLF)

d.. Flexible-pavement design by IRe 3y - 2001.:



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