What is the size of the gravel which is used in pavements for Granular base?

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Asked: May 22, 20202020-05-22T11:20:31+05:30 2020-05-22T11:20:31+05:30In: Geotechnical Engineering

What is the size of the gravel which is used in pavements for Granular base and Which type of soil is mostly used?

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HMNZ 1010 · Answer 1 · 2020-06-12T13:01:12+05:30

This question actually needs very long & detailed answer,It can not be answered in 2 lines.However,Let me summarize this as possible.

The flexible pavement contains 4 main pavement layers that are as following Sub-grade(Natural soil) , Sub-base , base & Surface Course.
The surface course contains 4 layers as well that are as following Prime Coat , Binder Course , Tack Coat & Wearing Surface.
The Binder Course & Wearing Course contains the Following (Coarse aggregate + Fine aggregate + mineral filler + Asphalt)
Size & Gradation of aggregate(Coarse & fine) shall be as following as per AASHTO …> Coarse aggregate (Retained on Sieves#4 , 8 & 10) …> and the fine aggregate (Passing from Sieves#4 , 8 & 10) …> Mineral filler (at least 70% pass from sieve#200)
Regarding the Subgrade soil shall be Fine or Coarse aggregate and the soil shall have group index less than 4 to be suitable for use as per AASHTO
Group index equation as following (G.I=0.2*a + 0.005*a*c + 0.01*b*d)