The SN a value of Flexible pavement goes up if the strength of subgrade goes up

Question

The SN a value of Flexible pavement goes up if the strength of subgrade goes up rest of the data remaining the same: True False The cost of building a road goes down if the Reliability goes up True False The maintenance cost of a road goes down as reliability increases True False The common practice of constructing an AC overlay on a PCC road is: Just clean it up and place AC Seal all cracks on the PCC and place AC Crush the PCC into aggregates, compact into a base and place AC Put a layer of gravel over PCC and place AC The use of reinforcement in JRCP an CRCP Resist bending stresses Resist shearing stression To control shrinkage stresses To resist thermal stresses CBR 4 converted into Mr is 8000 psi 4000 psi 5000 ps 6000 psi

Explanation / Answer

20.true

SN(thickness index) is the summation of strength of all layers

if strength of subgrade goes up then automatially valye of SN WILL BE GOES UP

21. fase

if we need reliabilty, we have to use quality material then cost will be high

22.true

if reliabilty is more then maintainence cost will be low

23.option a

  An asphalt overlay is resurfacing that provides a brand-new appearance for less cost.

24. option a (resisting shearing stression)

reinforcement will transverse deforamatiom

25.option b

4000 psi

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