wbm ppt
#1

[b] [/b]Hi am Surath, I would like to get details on WBM ppt ..Google suggested WBM ppt will be available here and now I am living in India and I am studying in the Techno India college.I need help on my seminar preparation.
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#2
WBM stands for Water Bound Macadam, which is the most used road construction procedure for over 190 years. Created by Scottish engineer John Loudon McAdam around 1820 Macadam is a type of road construction. The broken stones of the base and the surface course, if any are bound by stone dust is presence of moisture is called WBM Roads.


Macadam means the path of the base of the pavement made of crushed or broken aggregate mechanically entangled by laminate and the holes filled with screening and bonding material with the help of water. WBM can be used as a secondary base, base or surface course. Each compacted layer of WBM oscillates between 10 cm and 7.5 cm depending on the size and gradation of the aggregate used.

A 'WBM' path means 'Water Bound Macadam'. It derives its last part from the name of an engineer named Macadam who proposed and designed the structure of this section of the road. The other part of the name is pertinent since this type of road essentially uses the principle of joining the various in situ layers of boulders, stones, fine aggregates and fillings like moorum, stone dust, sand, etc.

Structure

A typical WBM road section comprises the following basic structure:

• Soil Preparation: This includes removal of the top soil, vegetation and loose sub-surface (if any) to the desired reduced levels. The substrate must be well consolidated and compacted at a curvature of 1 in 60 or 1 in 48.
• Preparation of base and base: This is the base and is also called soling. It consists of a very compact base made of rock rolls / kankar / burnt brick ballast in three layers, namely larger sized boulders (size 63 mm to 40 mm) uniformly placed as the lowest layer; Aggregates of medium size (size 40mm to 25mm) uniformly placed as the middle layer; And smaller sized aggregates (size 25mm and down) uniformly placed as filler material as the top layer. The layers should be compacted longitudinally in predetermined sections by a 10 tonne roller with the final compacted layer approximately 125 mm thick. A second section of said secondary base commonly known as a base and comprising a three layer system must be provided on the first field well compacted so that the total compacted thickness of the secondary base and base is about 250 mm. The compacted base should be dry rolled followed by saturating it well with water and then wet rolling until the base becomes cohesive and completely saturated.
• Surface dressing: The secondary base and base are allowed to dry over a period of time. Loose dust and dirt are removed by a combination of wire brushes, hard brush brushes and soft brushes to expose the clean metal surface to a depth of 6mm to 12mm, but without loosening the embedded stones.
• Asphalting: Temporary and semi-permanent roads only involve the mentioned steps. However, asphalting is done to make the roads all the time and durable. The process involves joining the surface with alternating bituminous tack layers and applying a layer of 40 mm bituminous concrete (commonly known as a "premix"). The final layer of a 25 mm thick bituminous mixture of thin aggregates and a sealing layer are applied as a wear layer and to make the road water tighten for greater durability.
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