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From Wikipedia, the free encyclopedia

Base layer of asphalt concrete in a road under construction.

Asphalt (en-us-asphalt.ogg ˈæs.fɒlt ) is a sticky, black and highly viscous liquid or semi-solid that is present in most crude petroleums and in some natural deposits sometimes termed asphaltum.[1] It is most commonly modelled as a colloid, with asphaltenes as the dispersed phase and maltenes as the continuous phase (though there is some disagreement amongst chemists regarding its structure).[citation needed] One writer states that although a "considerable amount of work has been done on the composition of asphalt, it is exceedingly difficult to separate individual hydrocarbon in pure form",[2] and "it is almost impossible to separate and identify all the different molecules of asphalt, because the number of molecules with different chemical structure is extremely large".[3]

In U.S. and Polish terminology, asphalt (or asphalt cement) is the carefully refined residue from the distillation process of selected crude oils. Outside these countries, the product is often called bitumen.

The primary use of asphalt is in road construction, where it is used as the glue or binder for the aggregate particles. The road surfacing material is usually called 'asphaltic concrete', AC in North America, or 'asphalt' elsewhere. Within North America the apparent interchangeability of the words asphalt and 'bitumen' causes confusion outside the road construction industry despite quite clear definitions within industry circles.

Contents

Etymology

The word asphalt is derived from the late Middle English : from French asphalte, based on Late Latin asphalton, asphaltum, from the Greek ásphalton, ásphaltos (άσφαλτος), a word of uncertain origin meaning "asphalt/bitumen/pitch" which some derive from α- "without" and σφάλλω "to make fall".[4] Note that in French, the term asphalte is used for naturally-occurring bitumen-soaked limestone deposits, and for specialised manufactured products with fewer voids or greater bitumen content than the "asphaltic concrete" used to pave roads. Another description has it that the term derives from the Accadian term "asphaltu" or "sphallo," meaning "to split." It was later adopted from the Homeric Greeks as a verb

meaning "to make firm or stable," "to secure". It is a significant fact that the first use of asphalt by the ancients was in the nature of a cement for securing or joining together various objects, and it thus seems likely that the name itself was expressive of this application. From the Greek, the word passed into late Latin, and thence into French ("asphalte") and English ("asphalt"). The expression "bitumen" originated in the Sanskrit, where we find the words "jatu," meaning "pitch," and "jatu-krit," meaning "pitch creating," "pitch producing" (referring to coniferous or resinous trees). The Latin equivalent is claimed by some to be originally 'gwitu-men' (pertaining to pitch), and by others, "pixtumens" (exuding or bubbling pitch), which was subsequently shortened to "bitumen," thence passing via French into English. From the same root is derived the Anglo Saxon word "cwidu" (Mastix), the German word "Kitt" (cement or mastic) and the old Norse word "kvada".[5]

Background

Asphalt in use to resurfacing of Francisco Delandes Avenue, in Belo Horizonte, Brazil.

Asphalt or bitumen can sometimes be confused with tar, which is a similar black thermo-plastic material produced by the destructive distillation of coal. During the early- and mid-twentieth century when town gas was produced, tar was a readily available product and extensively used as the binder for road aggregates. The addition of tar to macadam roads led to the word tarmac, which is now used in common parlance to refer to road making materials. However, since the 1970s, when natural gas succeeded town gas, asphalt (bitumen) has completely overtaken the use of tar in these applications.

Asphalt can be separated from the other components in crude oil (such as naphtha, gasoline and diesel) by the process of fractional distillation, usually under vacuum conditions. A better separation can be achieved by further processing of the heavier fractions of the crude oil in a de-asphalting unit, which uses either propane or butane in a supercritical phase to dissolve the lighter molecules which are then separated. Further processing is possible by "blowing" the product: namely reacting it with oxygen. This makes the product harder and more viscous.

Natural deposits of asphalt include lake asphalts (primarily from the Pitch Lake in Trinidad and Tobago and Bermudez Lake in Venezuela), Gilsonite, the Dead Sea, and Tar Sands. Asphalt was mined at Ritchie Mines in Macfarlan in Ritchie County, West Virginia in the United States from 1852 to 1873.

Asphalt is typically stored and transported at temperatures around 150 degrees Celsius (300 °F). Sometimes diesel oil or kerosene are mixed in before shipping to retain liquidity; upon delivery, these lighter materials are separated out of the mixture. This mixture is often called bitumen feedstock, or BFS. Some dump trucks route the hot engine exhaust through pipes in the dump body to keep the material warm. The backs of tippers carrying asphalt, as well as some handling equipment, are also commonly sprayed with a releasing agent before filling to aid release. Diesel oil is sometimes used as a release agent, although it can mix with and thereby reduce the quality of the asphalt.

Known uses

Ancient times

In the ancient Middle East, natural asphalt deposits were used for mortar between bricks and stones, to cement parts of carvings such as eyes into place, for ship caulking, and for waterproofing.[1] The Persian word for asphalt is mumiya, which is related to the English word mummy. Asphalt was also used by ancient Egyptians to embalm mummies.[1][6] In the ancient Far East, natural asphalt was slowly boiled to get rid of the higher fractions, leaving a material of higher molecular weight which is thermoplastic and when layered on objects, became quite hard upon cooling. This was used to cover objects that needed waterproofing,[1] such as scabbards and other items. Statuettes of household deities were also cast with this type of material in Japan, and probably also in China.[citation needed]

In North America, archaeological recovery has indicated that asphaltum was sometimes used to apply stone projectile points to a wooden shaft.[7]

Early use in Europe

Bituminous outcrop of the Puy de la Poix, Clermont-Ferrand, France

The use of asphalt in the United Kingdom and United States was preceded by its use in Europe. An 1838 edition of Mechanics Magazine cites an early use of asphalt in France. A pamphlet dated 1621, by "a certain Monsieur d'Eyrinys, states that he had discovered the existence (of asphaltum) in large quantities in the vicinity of Neufchatel", and that he proposed to use it in a variety of ways - "principally in the construction of air-proof granaries, and in protecting, by means of the arches, the water-courses in the city of Paris from the intrusin of dirt and filth", which at that time made the water unusable. "He expatiates also on the excellence of this material for forming level and durable terraces" in palaces, "the notion of forming such terraces in the streets not one likely to cross the brain of a Parisian of that generation".[8] But it was generally neglected in France until the revolution of 1830. Then, in the 1830s, there was a surge of interest, and asphalt became widely used "for pavements, flat roofs, and the lining of cisterns, and in England, some use of it had been made of it for similar purposes". Its rise in Europe was "a sudden phenomenon", after natural deposits were found "in France at Osbann (BasRhin), the Parc (l'Ain) and the Puy-de-la-Poix (Puy-de-Dome)", although it could also be made artificially.[9]

Early use in the United Kingdom

William Salmon's Polygraphice (1673) provides a recipe for varnish used in etching, consisting of three ounces of virgin wax, two ounces of mastic, and one ounce of asphaltum.[10]

In Britain, the first patent was 'Cassell's patent asphalte or bitumen' in 1834.[9] Then on 25 November 1837, Richard Tappin Claridge patented the use of Seyssel asphalt (patent #7849), for use in asphalte pavement,[11][12] having seen it employed in France and Belgium when visiting with Frederick Walter Simms, who worked with him on the introduction of asphalt to Britain.[13] Dr T. Lamb Phipson claims that his father, Samuel Ryland Phipson, a friend of Claridge, was also "instrumental in introducing the asphalte pavement (in 1836)".[14]

In 1838, Claridge obtained patents in Scotland on 27 March, and Ireland on 23 April, and in 1851 he sought to extend the duration of all three patents.[9][15][16][17] He formed Claridge's Patent Asphalte Company for the purpose of introducing to Britain "Asphalte in its natural state from the mine at Pyrimont Seysell in France",[18] and "laid one of the first asphalt pavements in Whitehall".[19] Trials were made of the pavement in 1838 on the footway in Whitehall, the stable at Knightsbridge Barracks,[18][20] "and subsequently on the space at the bottom of the steps leading from Waterloo Place to St. James Park".[20] "The formation in 1838 of Claridge's Patent Asphalte Company (with a distinguished list of aristocratic patrons, and Marc and Isambard Brunel as, respectively, a trustee and consulting engineer), gave an enormous impetus to the development of a British asphalt industry".[16] "By the end of 1838, at least two other companies, Robinson's and the Bastenne company, were in production",[21] with asphalt being laid as paving at Brighton, Herne Bay, Canterbury, Kensington, the Strand, and a large floor area in Bunhill-row, while meantime Claridge's Whitehall paving "continue(d) in good order".[22] Indeed in 1838, there was a flurry of entrepreneurial activity over asphalt. On the London stockmarket, there were various claims as to the priority of asphalt quality from France, Germany and England. And numerous patents were granted in France, with similar numbers of patent applications being denied in England due to their similarity to each other. In England, "Claridge's was the type most used in the 1840s and 50s" [21] Claridge's own company ceased operating in 1917.[23][24]

Early use in the United States

The first use of asphaltum in the New World was by indigenous Indian tribes. On the west coast, as early as the 1200s, the Tongva and Chumash Nations collected the naturally occurring asphaltum that seeped to the surface above underlying petroleum deposits. Both tribes used the substance as an adhesive. It is found on many different artifacts of tools and ceremonial items. For example, it was used on rattles to adhere gourds or turtle shells to rattle handles. It was also used in decorations. Small round shell beads were often set in asphatum to provide decorations. It was used as a sealant on baskets to make them water tight for carrying water. Asphaltum was used also to seal the planks on ocean-going canoes.

Roads in the US have been paved with asphalt since at least 1870, when a street in front of Newark, NJ's City Hall was paved. In 1876, asphalt was used to pave Pennsylvania Avenue in Washington, DC, in time for the celebration of the national centennial.[25] Asphalt was also used for flooring, paving and waterproofing of baths and swimming pools during the early 1900s, following similar trends in Europe.[26]

Rolled asphalt concrete

The largest use of asphalt is for making asphalt concrete for road surfaces and accounts for approximately 85% of the asphalt consumed in the United States. Asphalt pavement material is commonly composed of 5 percent asphalt cement and 95 percent aggregates (stone, sand, and gravel). Due to its highly viscous nature, asphalt cement must be heated so that it can be mixed with the aggregates at the asphalt mixing plant. There are about 4,000 asphalt mixing plants in the U.S.

Asphalt road surface is the most widely recycled material in the US, both by gross tonnage and by percentage. According to a report issued by the Federal Highway Administration and the United States Environmental Protection Agency, 80% of the asphalt from road surfaces' that is removed each year during widening and resurfacing projects is reused as part of new roads, roadbeds, shoulders and embankments.

Roofing shingles account for most of the remaining asphalt consumption. Other uses include cattle sprays, fence post treatments, and waterproofing for fabrics.

Asphalt is widely used in airports around the world. Due to the sturdiness, it is widely used for runways dedicated to aircraft landing and taking off.

Mastic asphalt

Mastic asphalt is a type of asphalt which differs from dense graded asphalt (asphalt concrete) in that it has a higher bitumen (binder) content, usually around 7–10% of the whole aggregate mix, as opposed to rolled asphalt, which has only around 5% added bitumen. This thermoplastic substance is widely used in the building industry for waterproofing flat roofs and tanking underground. Mastic asphalt is heated to a temperature of 210 °C (410 °F) and is spread in layers to form a impervious barrier about 20 millimeters (0.8 in) thick. There is a proper apprenticeship and trainees go to college to learn this trade.

Asphalt emulsion

A number of technologies allow asphalt to be mixed at much lower temperatures. These involve mixing the asphalt with petroleum solvents to form "cutbacks" with reduced melting point or mixtures with water to turn the asphalt into an emulsion. Asphalt emulsions contain up to 70% asphalt and typically less than 1.5% chemical additives. There are two main types of emulsions with different affinity for aggregates, cationic and anionic. Asphalt emulsions are used in a wide variety of applications. Chipseal involves spraying the road surface with asphalt emulsion followed by a layer of crushed rock or gravel. Slurry Seal involves the creation of a mixture of asphalt emulsion and fine crushed aggregate that is spread on the surface of a road. Cold mixed asphalt can also be made from asphalt emulsion to create pavements similar to hot-mixed asphalt, several inches in depth and asphalt emulsions are also blended into recycled hot-mix asphalt to create low cost pavements.

Alternatives and bioasphalt

Certain activist groups have become increasingly concerned about the global peak oil and climate change problem in recent years due to by-products that are released into the atmosphere. Most of the emissions are derived primarily from burning fossil fuels. This has led to the introduction of petroleum bitumen alternatives that are more environmentally friendly and non-toxic.

See also

References

  1. ^ a b c d Abraham, Herbert (1938). Asphalts and Allied Substances: Their Occurence, Modes of Production, Uses in the Arts, and Methods of Testing (4th ed.). New York: D. Van Nostrand Co. http://www.archive.org/details/asphaltsandallie031010mbp. Retrieved 2009-11-16.  Full text at Internet Archive (archive.org)
  2. ^ Muhammad Abdul Quddus (1992). "Catalytic Oxidation of Asphalt". thesis submitted to Department of Applied Chemistry; University of Karachi. Pakistan: Higher Education Commission Pakistan: Pakistan Research Repository. p. 6, in ch.2 pdf. http://eprints.hec.gov.pk/1171/1/891.html.htm. 
  3. ^ Muhammad Abdul Quddus (1992), p.99, in ch.5 pdf
  4. ^ Liddell, Henry George. "A Greek-English Lexicon". http://artfl.uchicago.edu/cgi-bin/philologic/getobject.pl?c.1:5:73.lsj. Retrieved 2009-02-01. 
  5. ^ Abraham, Herbert (1938), p.1
  6. ^ Pringle, Heather Anne (2001). The Mummy Congress: Science, Obsession, and the Everlasting Dead. New York, NY: Barnes & Noble Books. pp. 196–197. ISBN 0-7607-7151-0. 
  7. ^ C.Michael Hogan (2008) Morro Creek, ed. by A. Burnham
  8. ^ "Nothing New under the Sun (on French asphaltum use in 1621)". The Mechanic's magazine, museum, register, journal and gazette. 29. London: W.A. Robertson. April 7th-29th September 1838. p. 176. http://books.google.com.au/books?id=ygoAAAAAMAAJ&pg=PA479&lpg=PA479&dq=1838+september+%22mechanic's+magazine%22&source=bl&ots=qtle2WwEjk&sig=kQIkl0cGnEC7Qc466HL2SLMJLSE&hl=en&ei=mjH7Suz_IsqUkAWEmqitCw&sa=X&oi=book_result&ct=result&resnum=2&ved=0CAsQ6AEwAQ#v=onepage&q=asphaltum%20museum&f=false. 
  9. ^ a b c Miles, Lewis (2000). "Section 10.6: Damp Proofing". in Australian Building: A Cultural Investigation. p. 10.06.1. http://www.mileslewis.net/australian-building/pdf/climatic-design/climatic-design-damp-proofing.pdf. Retrieved 2009-11-11. . Note: different sections of Miles' online work were written in different years, as evidenced at the top of each page (not including the heading page of each section). This particular section appears to have been written in 2000
  10. ^ Salmon, William (1673). Polygraphice; Or, The Arts of Drawing, Engraving, Etching, Limning, Painting, Washing, Varnishing, Gilding, Colouring, Dying, Beautifying and Perfuming. Second Edition.. London: R. Jones. p. 81. http://shipbrook.com/jeff/bookshelf/download.html?bookid=22. 
  11. ^ "Specification of the Patent granted to Richard Tappin Claridge, of the County of Middlesex, for a Mastic Cement, or Composition applicable to Paving and Road making, covering Buildings and various purposes". Journal of the Franklin Institute of the State of Pennsylvania and Mechanics' Register. Vol. 22. London. July 1838. pp. 414–418. http://books.google.com.au/books?id=W8oGAAAAYAAJ&pg=PA414&lpg=PA414&dq=%22richard+tappin+claridge%22&source=bl&ots=8ybZtOzWr6&sig=XaraE45pME1vO6QZW8rUsL7bXMI&hl=en&ei=0nsES8vkHMfykAWX7bzBAQ&sa=X&oi=book_result&ct=result&resnum=3&ved=0CA4Q6AEwAg#v=onepage&q=%22richard%20tappin%20claridge%22&f=false. Retrieved 18 November 2009. 
  12. ^ "Comments on asphalt patents of R.T. Claridge, Esq". Notes and Queries: A medium of intercommunication for Literary Men, General Readers, etc. Ninth series.. Volume XII, July-December, 1903 (9th S. XII, July 4, 1903). London: John C. Francis. January 20 1904. pp. 18–19. http://www.archive.org/stream/s9notesqueries12londuoft#page/18/mode/2up/search/claridge.  Writer is replying to note or query from previous publication, cited as 9th S. xi. 30
  13. ^ "Obituary of Frederick Walter Simms". Monthly Notices of the Royal Astronomical Society (London: Strangeways & Walden) XXVI: 120–121. November 1865 - June 1866. http://books.google.co.uk/books?id=3wsAAAAAMAAJ. Retrieved 2009-11-12. 
  14. ^ Phipson, Dr T. Lamb (1902). Confessions of a Violinist: Realities and Romance. London: Chatto & Windus. p. 11. http://www.archive.org/details/confessionsofvio00phiprich. Retrieved 26 November 2009.  Full text at Internet Archive (archive.org)
  15. ^ "Claridge's UK Patents in 1837 & 1838". The London Gazette. February 25 1851. p. 489. http://www.london-gazette.co.uk/issues/21185/pages/489. 
  16. ^ a b Hobhouse, Hermione (General Editor) (1994). "British History Online". 'Northern Millwall: Tooke Town', Survey of London: volumes 43 and 44: Poplar, Blackwall and Isle of Dogs. pp. 423–433 (see text at refs 169 & 170). http://www.british-history.ac.uk/report.aspx?compid=46514&strquery=Claridge. Retrieved 2009-11-08. 
  17. ^ "Claridge's Scottish and Irish Patents in 1838". The Mechanic's magazine, museum, register, journal and gazette. 29. London: W.A. Robertson. April 7th-29th September 1838. pp. vii, viii, 64, 128. http://books.google.com.au/books?id=ygoAAAAAMAAJ&pg=PA479&lpg=PA479&dq=1838+september+%22mechanic's+magazine%22&source=bl&ots=qtle2WwEjk&sig=kQIkl0cGnEC7Qc466HL2SLMJLSE&hl=en&ei=mjH7Suz_IsqUkAWEmqitCw&sa=X&oi=book_result&ct=result&resnum=2&ved=0CAsQ6AEwAQ#v=onepage&q=claridge&f=false. 
  18. ^ a b "Joint Stock Companies (description of asphalte use by Claridge's company)". The Civil Engineer and Architects Journal. Vol. 1. London. October 1837-December 1838. p. 199. http://www.archive.org/details/civilengineerarc01lond. Retrieved 2009-11-16.  Full text at Internet Archive (archive.org). Alternative viewing at: http://books.google.com/books?id=sQ5AAAAAYAAJ&pg
  19. ^ Miles, Lewis (2000), pp.10.06.1-2
  20. ^ a b Comments on asphalt patents of R.T. Claridge, Esq (1904), p.18
  21. ^ a b Miles, Lewis (2000), p.10.06.2
  22. ^ "1838 bitumen UK uses by Robinson's and Claridge's companies, & the Bastenne company". The Mechanic's magazine, museum, register, journal and gazette. 29. London: W.A. Robertson. 22nd September 1838. p. 448. http://books.google.com.au/books?id=ygoAAAAAMAAJ&pg=PA479&lpg=PA479&dq=1838+september+%22mechanic's+magazine%22&source=bl&ots=qtle2WwEjk&sig=kQIkl0cGnEC7Qc466HL2SLMJLSE&hl=en&ei=mjH7Suz_IsqUkAWEmqitCw&sa=X&oi=book_result&ct=result&resnum=2&ved=0CAsQ6AEwAQ#v=onepage&q=bastenne&f=false. 
  23. ^ "Claridge's Patent Asphalte Co. winds up 10 November 1917". The London Gazette. 16 November 1917. p. 11863. http://www.london-gazette.co.uk/issues/30384/pages/11863. 
  24. ^ Hobhouse, Hermione (General Editor) (1994). "British History Online". 'Cubitt Town: Riverside area: from Newcastle Drawdock to Cubitt Town Pier', Survey of London: volumes 43 and 44: Poplar, Blackwall and Isle of Dogs. pp. 528–532 (see text at refs 507 & 510). http://www.british-history.ac.uk/report.aspx?compid=46529&strquery=claridge. Retrieved 2009-11-08. 
  25. ^ McNichol, Dan (2005). Paving the Way: Asphalt in America. Lanham, MD: National Asphalt Pavement Association. ISBN 0-914313-04-5. http://store.hotmix.org/index.php?productID=144. 
  26. ^ Gerhard, W.M. Paul (1908). Modern Baths and Bath Houses (1st ed.). New York: John Wiley and Sons. http://www.archive.org/details/modernbathsandb00unkngoog. 
  • Barth, Edwin J., Asphalt: Science and Technology Gordon and Breach (1962). ISBN 0-677-00040-5.

External links


1911 encyclopedia

Up to date as of January 14, 2010

From LoveToKnow 1911

ASPHALT, or Asphaltum. The solid or semi-solid kinds of bitumen were termed i aXros by the Greeks; and by some ancient classical writers the name of pissasphaltum (irivaa, pitch) was also sometimes employed. The asphalt of the Dead Sea (known as Lacus Asphaltites) received considerable notice from early travellers, and Diodorus the historian states that the inhabitants of the surrounding parts were accustomed to collect it for use in Egypt for embalming. In common with other forms of bitumen, asphalt is very widely distributed geographically and occurs in greater or less quantity in rocks of all ages. There is some divergence in the views expressed as to the precise manner of its production, but it may certainly be said that the principal asphalt deposits are merely the result of the evaporation and oxidation of liquid petroleum which has escaped from outcropping strata. The celebrated Pitch Lake of Trinidad was long regarded as the largest deposit of asphalt in existence, but it is said to be exceeded in area, if not in depth also, by one in Venezuela. The Trinidad "Lake" has an area of 99.3 acres, and is sufficiently firm in places to support a team of horses. The deposit is worked with picks to a depth of a foot or two, and the excavations soon become filled up by the plastic material flowing in from below and hardening. The depth of the deposit is not accurately known. The surface is not level but is composed of irregularly tumescent masses of various sizes, each said to be subject to independent motion, whereby the interior of each rises and flows centrifugally towards the edges. As the spaces between them are always filled with water, these masses are prevented from coalescing. The softer parts of the lake constantly evolve gas, which is stated to consist largely of carbon dioxide and sulphuretted hydrogen, and the pitch, which is honeycombed with gas-cavities, continues to exhibit this action for some time after its removal from the lake. The working of the deposit is in the hands of the New Trinidad Asphalt Company, who hold the concession up to the year 1930 on payment to the government of a minimum royalty of ro,000 a year. A circular line of tramway, supported on palm-leaves, has been laid on the lake to facilitate the removal of the asphalt. Very large quantities are exported for paving and other purposes, the annual shipments amounting to about 130,000 tons from the lake and about 30,000 tons from other properties. The amount of asphalt in the lake has been estimated at 158,400 tons for each foot of depth, and if the average depth be taken at 20 ft. this would give a total of 3,168,000 tons; but in 1908, though 1,885,000 tons had been removed in the previous thirty-five years, there was but little evidence of reduction in the quantity. The Venezuelan deposit already referred to is in the state of Bermudez, and the area of it is reported to be more than loon acres. The asphalt of Cuba is a well-known article of commerce, of which 7252 tons was exported to the United States in 1902. The principal deposits are near the harbour of Cardenas (70 ft. thick), in the Pinar del Rio, near Havana (18 ft. thick), at Canas Tomasita 005 ft. thick); and a specially pure variety near Vuelta.

Refined

Trinidad,

Melting

point

Refined

Cuba (soft) ,

Melting

point

Refined

Cuba (hard) ,

Melting

point

185°F.

115°F.

160°F.

Water

0.17

0.13

o. II

Volatile bitumen .

51.81

64 03

8'34

Sulphur. .

io oo

8.35

8.92

Ash (earthy matter) .

28.30

19.51

16.60

Fixed carbon

9.72

7.98

66.03

100 00

100.00

100.00

C.

H.

N.

O.

S.

80.32

6.30

0.50

1'40

11.48

Specific gravity at 60° F. .

Bitumen soluble in carbon bi-

sulphide .

Mineral matter (ash

Refined

Trinidad.

1.373

61.507%

34.5 1 ,,

Refined

Bermudez.

1.07 1

92.22%

Non-bituminous organic matter .

3.983 „

1.28 „

Portion of total bitumen soluble

in alcohol

8.24 ,7

II.66 „

Portion of total bitumen soluble

in ether.. .

80.01 „

81.63 „

Loss at 212° F... .

o 65 „

1.37

„ 400° F. in ten hours .

7.98 „

17'80

Loss at 400° on total bitumen .

12.811 „

18.308 „

Evolution of sulphuretted hydro-

gen at .

410° F.

none at 437° F.

Softening-point. .

160° F.

113° F.

Flowing-point. .

192° F.

„ 150° F.

The comparative composition of Trinidad and Cuba asphalt is given in the following table: The chemical composition of Trinidad asphalt has been given as: The following is a comparison of Trinidad and Venezuela (Bermudez) asphalt: Asphalt in its purest forms is generally black or blackish brown in colour, and is frequently brittle at ordinary temperatures. Apart from its principal use in the manufacture of paving materials, it is largely employed in building as a "dampcourse" and as a water-excluding coating for concrete floors, as well as in the manufacture of roofing-felt. It also enters largely into the composition of black varnish. The material chiefly used in the construction of asphalt roadways is an asphaltic or bituminous limestone found in the Val de Travers, canton of Neuchatel; in the neighbourhood of Seyssel, department of Ain; at Limmer, near the city of Hanover; and elsewhere. The proportion of bitumen present in asphalt rock usually ranges from 7 to 20%, but it is found that rock containing more than x 1% cannot be satisfactorily used for street pavements, and it is accordingly customary to mix the richer and poorer varieties in fine powder in such respective quantities that the proportion of bitumen present is from 9 to 10%. The richer rock is utilized as a source of asphalt "mastic," which is employed for footpaths, floors, roofs, &c. Excellent foundations for steam-hammers, dynamos and high-speed engines are made of asphaltic concrete. (B. R.)


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Wiktionary

Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

See also asphalt

German

Noun

Asphalt m. (genitive Asphaltes, plural Asphalte)

  1. asphalt, tarmac

Strategy wiki

Up to date as of January 23, 2010

From StrategyWiki, the free strategy guide and walkthrough wiki

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Asphalt
Box artwork for Asphalt.
Developer(s) Ubisoft
Publisher(s) Ubisoft
Release date(s)
Genre(s) Shooter
System(s) Amstrad CPC
Mode(s) Single player
For the Nintendo DS racing games, see Category:Asphalt.

Table of Contents

Asphalt/Table of Contents








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