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Ety X

May 3, 2012
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A paving material that consists of crushed stone rolled and bound with a mixture of tar and bitumen or a pavement created by spraying tar over crushed stone.John Loudon McAdam invented a road construction method called macadamisation.These roads were adequate for use by horses and carriages or coaches, but they were very dusty and subject to erosion with heavy rain. This method involved spreading tar on the subgrade, then placing a typical macadam layer and then sealing the macadam with a mixture of tar and sand. Tar-grouted macadam was also in use well before 1900, and involved scarifying the surface of an existing macadam pavement, spreading tar and re-compacting. Although the use of tar in road construction was known in the 19th century, it was little used and was not introduced on a large scale until the motor car arrived on the scene in the early 20th century.

The word X came into use when the macadamisation was covered by a layer of mechanically mixed tar and aggregate prior to lay-down, and then compacting the mixture with a steam roller. The tar was modified by adding small amounts of Portland cement, resin and pitch.

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One Comment leave one →
  1. Girish permalink
    May 3, 2012 1:09 pm

    Tarmac

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