CEP423 Principles of Transportation Engineering
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Questions and Answers

What is the term for the part of the road that carries traffic and has a set of layers or material placed over the natural ground?

  • Subgrade
  • Dowel Bars
  • Joints
  • Pavement (correct)

What is the purpose of joints placed in concrete pavements, which are placed transversely across the pavement width?

  • To reduce the weight of the pavement
  • To increase the strength of the pavement
  • To provide drainage
  • To provide suitable transition between concrete placed at different times or on different days (correct)

What type of pavement is constructed with Portland cement concrete?

  • Rigid Pavement (correct)
  • Flexible Pavement
  • Pervious Pavement
  • Perpetual Pavement

Where is the critical section of a contraction joint typically located?

<p>At the edge and will crack approximately 30° (A)</p> Signup and view all the answers

What factor does the modulus of subgrade involve?

<p>Pressure and Deflection (C)</p> Signup and view all the answers

What is the primary factor that affects the design of the following except?

<p>Type of Road Surface (D)</p> Signup and view all the answers

What type of pavement is a cement grouted pavement classified as?

<p>Rigid Pavement (D)</p> Signup and view all the answers

What is the minimum thickness of the base of a flexible pavement?

<p>100 mm (A)</p> Signup and view all the answers

How long does it take for newly constructed pavement with ordinary Portland cement to attain its working strength?

<p>28 days (A)</p> Signup and view all the answers

What is the bottom-most component of a flexible pavement called?

<p>Subgrade (B)</p> Signup and view all the answers

A pavement is said to be flexible if it contains what type of layer?

<p>Bitumen-bound stone layer of varying aggregates (B)</p> Signup and view all the answers

What is the minimum thickness of the sub-base for a poorly graded sub-grade soil?

<p>300 mm (C)</p> Signup and view all the answers

What is the type of freeway interchanges shown in the figure?

<p>Trumpet Interchange (A)</p> Signup and view all the answers

What type of intersection has a larger number of traffic lanes or pavement width?

<p>Flared Intersection (B)</p> Signup and view all the answers

What is the value of the wheel load 'W' in kN?

<p>55.09 (B)</p> Signup and view all the answers

What is the spacing between construction joints for a 4 m slab width?

<p>4.44 m (C)</p> Signup and view all the answers

What is the modulus of subgrade reaction in kN/m3?

<p>30557.75 (D)</p> Signup and view all the answers

What is the width of each strip in a pavement slab laid in three strips?

<p>5 m (D)</p> Signup and view all the answers

What is the required pavement thickness to carry a maximum wheel load of 80kN, considering the effects of dowels or tie bars, with a concrete compressive strength of 21MPa and an allowable tensile stress of 0.06fc'?

<p>463.44 mm (A)</p> Signup and view all the answers

What is the void ratio of the material after compaction, if the in-situ void ratio is 0.75 and the total material required is 100 cubic meters?

<p>0.5 (A)</p> Signup and view all the answers

What is the expansion pressure required to calculate the pavement thickness, if the average pavement density is 0.0030 kg/cm^2 and the pavement thickness is 53.33 cm?

<p>0.250 kg/cm^2 (D)</p> Signup and view all the answers

How much material must be excavated from a pit with an in-situ void ratio of 0.75 and a void ratio of 0.50 after compaction, to obtain 100 cubic meters of material?

<p>116.67 cubic meters (D)</p> Signup and view all the answers

What is the maximum wheel load that can be carried by a rigid pavement with a thickness of 308.61 mm, considering the effects of dowels or tie bars, with a concrete compressive strength of 21MPa and an allowable tensile stress of 0.06fc'?

<p>80kN (C)</p> Signup and view all the answers

What is the coefficient of friction between pavement and subgrade?

<p>1.50 (A)</p> Signup and view all the answers

What is the allowable tensile stress in steel?

<p>138 MPa (B)</p> Signup and view all the answers

What is the allowable bond stress between concrete and steel?

<p>0.82 MPa (A)</p> Signup and view all the answers

What is the purpose of tie bars in a pavement slab?

<p>To prevent lateral movement (D)</p> Signup and view all the answers

What is the deflection of a 30 inches diameter plate under a pressure of 40 psi?

<p>0.18 in (D)</p> Signup and view all the answers

What is the value of fc' in the proposed Nagtahan road?

<p>21 MPa (D)</p> Signup and view all the answers

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