What is Tarmacadam?

Tarmacadem is a renovation of macadam, a type of road construction invented in the early 19th century.

Tarmacadam, also known as tar, is an abbreviation for tar-penetrating macadam. Tar was used to pave roads and other large, flat surfaces, and although tar is no longer used for paving due to the introduction of asphalt, the word asphalt is still used in reference to airport runways and some roads in many parts of the world. , especially in the former British colonies. Tarmacadam was patented by E. Purnell Hooley in 1901, who later sold the invention to Wolverhampton MP, who relaunched the product with great success in 1905. Tarmac Limited, Wolverhampton’s asphalt arm, remains a major player in building materials. British heavy.

Tarmacadam emerged as a way to seal macadam, preventing roads from breaking with heavy use and minimizing dust.

Tarmacadam is a renovation of macadam, a type of road construction invented by John Loudon McAdam in the early 19th century. Macadamized roads are made of three layers of aggregate materials that decrease in size, with the bottom layer being the largest and heaviest. Each layer is pressed with a roller to flatten it and force the materials to bond between the layers. The resulting pavement was strong and drained easily, but as motor vehicles spread out, the macadam could not withstand the heavy wear and tear and began to disintegrate.

Tarmacadam emerged as a way to seal macadam, preventing roads from breaking with heavy use and minimizing dust. Tar is created by spraying tar along a macadamized road to further bond it and pressing the surface with a roller to drive the tar deep into the macadam. Asphalt roads were highly durable and still exist in some countries, although they are gradually being replaced by asphalt concrete, made with petroleum derivatives.

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Some roads on the east coast of the United States have their original asphalt surfaces, and many East Coast residents still refer to the roads as “macadam” even if they have been resurfaced with asphalt. Many developing countries have also retained their asphalt roads and lanes. Tar can be repaired by healing and resurfacing the top layer of small materials, and this is still done in some parts of the world to avoid the more expensive complete replacement that asphalt paving involves.

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