Question 1 |

As per IRC:37-2012, in order to control subgrade rutting in flexible pavements, the parameter to be considered is

horizontal tensile strain at the bottom of bituminous layer | |

vertical compressive strain on top of subgrade | |

vertical compressive stress on top of granular layer | |

vertical deflection at the surface of the pavement |

Question 1 Explanation:

As per \mathrm{IRC}: 37-2012

N=4.1656 \times 10^{-0.08}\left[\frac{1}{\epsilon_{V}}\right]^{4.5337}

N=1.41 \times 10^{-8}\left[\frac{1}{\epsilon_{v}}\right]^{4.5337}

where N= No. of cumulative standard axle

\epsilon_{v}= Vertical strain in the subgrade

N=4.1656 \times 10^{-0.08}\left[\frac{1}{\epsilon_{V}}\right]^{4.5337}

N=1.41 \times 10^{-8}\left[\frac{1}{\epsilon_{v}}\right]^{4.5337}

where N= No. of cumulative standard axle

\epsilon_{v}= Vertical strain in the subgrade

Question 2 |

Road roughness is measured using

Benkelman beam | |

Bump integrator | |

Dynamic cone penetrometer | |

Falling weight deflectometer |

There are 2 questions to complete.