What is granular pavement?
Aggregates are used in granular base and subbase layers below the driving surface layer(s) in both asphalt concrete and Portland cement concrete pavement structures. The granular base layer is directly below the pavement surface and acts as the load bearing and strengthening component of the pavement structure.
What is granular layer for road?
Granular Sub-base (GSB) consists of laying and compacting well graded material on prepared sub-grade in accordance with the specifications.: GSB layer is intermediate layer in between Sub-grade and Wet mix macadam. GSB layer is laid in roads and higway works due to its properties .
What is granular material used for in road construction?
Granular Sub Base(GSB) is natural or designed construction material, used for road construction as a sub-base layer. Granular Sub Base is a layer in road foundation just above the compacted sub-grade layer.
What are the function of granular base course?
Granular Base Course: Stability. Resistance to abrasion. Resistance to penetration of water. Capillary properties to replace moisture lost by surface evaporation upon the addition of wearing course requirement change.
What is granular fill?
Granular fill shall consist of pit-run gravel, sand or crushed gravel placed upon the prepared areas and in excavations, at locations and to thicknesses specified.
What is granular base material?
Granular base course shall consist of an intimate mixture of crushed aggregate and water, which is placed in layers upon a prepared surface, compacted and finished, as specified herein.
How do you calculate granular fill?
How much gravel do I need?
- Determine the length and width of a cuboidal excavation.
- Calculate the area of the excavation, multiplying the length and width together.
- Determine the depth of the excavation.
- Multiply the area and depth of the excavation to obtain its volume in cubic yards: 18 * 2 = 36 yd³ .
What is Type 1 granular fill?
Type 1 Sub Base is generally a 40mm graded to dust material that is laid and compacted to form a level stable construction layer as a platform for asphalt or concrete. It is typically used in the construction of highways, car parks, footways and hard standing areas.
What is the rate of GSB?
Granular Sub Base (GSB) Road Material, Packaging Size: 50 kg, Rs 475 /ton | ID: 21100875112.
What are the characteristics of pavement?
•Made up of multiple, fairly thin layers •Each layer distributes load over larger area of layer below •Pavement deflects under load •Typically asphalt •Easily and commonly recycled •Typical lives 15-20 years (to first rehab) Flexible Pavement •Pavement layers bend •Each layer spreads load to next layer •Loads over a smaller area of subgrade
What is the AASHTO flexible pavement design method?
Basic AASHTO Flexible Pavement Design Method •Determine the desired terminal serviceability, p t •Convert traffic volumes to number of equivalent 18-kip single axle loads (ESAL) •Determine the structural number, SN •Determine the layer coefficients, a i •Solve layer thickness equations for individual layer thickness
What are the different types of pavement layers?
Basic Pavement Types •Flexible •Rigid Primary difference is in how loads are distributed to subgrade. Typical Pavement Layers •Wearing course or surface •Base course •Subbase •Subgrade –Compacted or Stabilized –Natural Surface Courses •Safety •Traffic Loads •Environmental Factors –Temperature extremes –Moisture •Other Considerations
What is the difference between primary and subgrade layers of pavement?
•Flexible •Rigid Primary difference is in how loads are distributed to subgrade. Typical Pavement Layers •Wearing course or surface •Base course •Subbase