Tarmac (short for tarmacadam, a portmanteau for tar-penetration macadam) is a type of highway surface, pioneered by John Loudon McAdam in around 1820. Strictly speaking, Tarmac refers to a material patented by Edgar Purnell Hooley in 1901. The term is also used, with varying degrees of correctness, for a variety of other materials, including tar-grouted macadam, Tarvia, bituminous surface treatments and even modern asphalt concrete.


The first city to have its streets paved with tar was Baghdad in the 8th century AD.cite book|author=Dr. Kasem Ajram|title=The Miracle of Islam Science|edition=2nd Edition|publisher=Knowledge House Publishers|year=1992|id=ISBN 0-911119-43-4] Macadamized roads were adequate for use by horses and carriages or coaches, but they were very dusty, subject to erosion with heavy rain and did not hold up to higher speed motor vehicle use. Methods to stabilise macadam roads with tar date back to at least 1834, when Henry Cassell patented "Pitch Macadam". 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.

Hooley's 1901 patent for Tarmac involved mechanically mixing tar and aggregate prior to lay-down, and then compacting the mixture with a steam roller. The tar was modified with the addition of small amounts of Portland cement, resin and pitch.

Later developments

As petroleum production increased, the by-product asphalt became available in huge quantities and largely supplanted tar due to its reduced temperature sensitivity. The Macadam construction process also became quickly obsolete due to its high manual labour requirement; however, the somewhat similar tar and chip method, also known as bituminous surface treatment (BST), remains popular.

While the specific Tarmac pavement is not common in some countries today, many people use the word to refer to generic paved areas at airports, especially the airport ramp or "apron", near the terminals despite the fact that many of these areas are in fact made of concrete. This term seems to have been popularised when it became part of the news lexicon following live coverage of the Entebbe hijacking in 1976, where "Tarmac" was frequently used by the on-scene BBC reporter in describing the hijack scene. [ [http://www.jewishagency.org/JewishAgency/English/Jewish+Education/Compelling+Content/Eye+on+Israel/Current+Issues/Terror/Entebbe+Rescue.htm Entebbe Rescue] ] The Wick Airport at Wick in Caithness, Scotland is one of the few airports that still has a real Tarmac runway.


* Hooley, E. Purnell, US patent|765975, "Apparatus for the preparation of tar macadam", July 26, 1904.


ee also

*History of road transport – "covers the development of road-building techniques"
*Asphalt concrete
*Pavement (material)
*Tarmac (company)

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  • tarmac{™} — ➡ Tarmac * * * …   Universalium

  • tarmac — [ tarmak ] n. m. • 1910; mot angl., abrév. de tarmacadam, de tar « goudron » et macadam → macadam 2o ♦ Dans un aérodrome, Partie réservée à la circulation et au stationnement des avions. ● Tarmac nom masculin (n …   Encyclopédie Universelle

  • tarmac — ► NOUN 1) (trademark in the UK) material used for surfacing roads or other outdoor areas, consisting of broken stone mixed with tar. 2) (the tarmac) a runway or other area surfaced with such material. ► VERB (tarmacked, tarmacking) ▪ surface with …   English terms dictionary

  • tarmac — 1903 as a trademark name, short for tarmacadam (1882) pavement created by spraying tar over crushed stone, from tar (1) + John L. McAdam (see MACADAM (Cf. macadam)). By 1919, tarmac was being used generally in Great Britain for runway …   Etymology dictionary

  • Tarmac — Tarmac, ein in England aus Hochofenschlacke ausgeführter Teermakadam (s.d.) …   Lexikon der gesamten Technik

  • târmâc — s. v. rariţă. Trimis de siveco, 13.09.2007. Sursa: Sinonime …   Dicționar Român

  • tarmac — The verb has inflected forms tarmacked, tarmacking …   Modern English usage

  • tarmac — [tär′mak΄] n. [< TARMACADAM] 1. TARMACADAM 2. Chiefly Brit. an airport runway or apron 3. Chiefly Brit. a paved road …   English World dictionary

  • tarmac — tar|mac1 [ˈta:mæk US ˈta:r ] n trademark [Date: 1900 2000; Origin: Tarmac, a trademark, from tarmacadam tarmac (19 20 centuries), from tar + macadam smooth hard road surface (19 20 centuries) (from John L. McAdam (1756 1836), Scottish engineer… …   Dictionary of contemporary English

  • Tarmac — Cet article concerne le matériau ou la zone d un aéroport. Pour les autres significations, voir Tarmac (homonymie). Chemin rural revêtu de tarmac Sur les autres projets Wik …   Wikipédia en Français

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