You can help expand this article with text translated from the corresponding article in Ukrainian. (December 2021) Click [show] for important translation instructions.
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Officially, the Road Test was "...to study the performance of pavement structures of known thickness under moving loads of known magnitude and frequency."[citation needed] This study, carried out in the late 1950s in Ottawa, Illinois, is frequently quoted as a primary source of experimental data when vehicle wear to highways is considered, for the purposes of road design, vehicle taxation and costing.
The road test consisted of six two-lane loops along the future alignment of Interstate 80. Each lane was subjected to repeated loading by a specific vehicle type and weight. The pavement structure within each loop was varied so that the interaction of vehicle loads and pavement structure could be investigated. Satellite studies were planned in other parts of the country so that climate and subgrade effects could be investigated, but were never carried out.
The results from the AASHO road test were used to develop a pavement design guide, first issued in 1961 as the AASHO Interim Guide for the Design of Rigid and Flexible Pavements, with major updates issued in 1972 and 1993. The 1993 version is still in widespread use in the United States. A new guide, originally planned for release in 2002 but as yet still under development, would be the first AASHTO pavement design guide not primarily based on the results of the AASHO Road Test.
The AASHO road test introduced many concepts in pavement engineering, including the load equivalency factor. Unsurprisingly, the heavier vehicles reduced the serviceability in a much shorter time than light vehicles, and the oft-quoted figure, called the generalized fourth power law,[2] that damage caused by vehicles is "related to the 4th power of their axle weight", is derived from this. The other direct result of the tests were new quality assurance standards for road construction in the US, which are still in use today.
Contemporary historic place marker roadsign at the site.
The road test used large road user panels to establish the present serviceability rating (PSR) for each test section, as the test proceeded. Since panel ratings are expensive, a substitute key parameter present serviceability index (PSI) was established. The PSI is based on data on the road's longitudinal roughness, patch work, rutting and cracking. Later studies have shown that PSI is mainly a fruit of unevenness, with a correlation of more than 90% between the two. Unevenness was measured with a mechanical profilograph, reporting a parameter called slope variance (SV). SV is the second spatial derivative of height. For a vehicle traveling at speed, SV is the exciting source to vertical acceleration; the second derivative in time domain of height. This makes very good sense, since 1 – 80 Hz acceleration is the parameter used when relating human exposure from vibration to perceived discomfort in the current ISO 2631-1 (1997) standard. Thus, SV is physically linked to ride quality.
While the study is now quite old, it is still frequently referenced, though critics point out that its data is only valid under the specific conditions of the test with regard to the time, place, environment, and material properties present during the test. Extrapolating the data to different situations has been "problematic".[3] Other studies have attempted to refine the results, either through further empirical studies, or by developing mathematical models, with varying success. The AASHO study is still the most often quoted study on the subject however.[citation needed]
^The American Association of State Highway Officials (AASHO) was renamed the American Association of State Highway and Transportation Officials (AASHTO) on November 13, 1973.[1]
Referencesedit
^Federal Highway Administration (December 4, 2012). "November 13". Highway History. Federal Highway Administration. Retrieved August 18, 2013.
^. Pavement Interactive. August 15, 2007. Archived from the original on March 3, 2016. Retrieved August 18, 2014.
^Helwany, Sam (n.d.). . Archived from the original on February 15, 2005.[self-published source]
External linksedit
Wikimedia Commons has media related to AASHO Road Test.
AASHO Road Test at Federal Highway Administration website
Highway Research Board (1962). The AASHO Road Test: Report 7, Summary Report(PDF). Washington, DC: National Academy of Sciences—National Research Council – via Transportation Research Board.
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You can help expand this article with text translated from the corresponding article in Ukrainian December 2021 Click show for important translation instructions Machine translation like DeepL or Google Translate is a useful starting point for translations but translators must revise errors as necessary and confirm that the translation is accurate rather than simply copy pasting machine translated text into the English Wikipedia Do not translate text that appears unreliable or low quality If possible verify the text with references provided in the foreign language article You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation A model attribution edit summary is Content in this edit is translated from the existing Ukrainian Wikipedia article at uk Dorozhnij test AASHO see its history for attribution You should also add the template Translated uk Dorozhnij test AASHO to the talk page For more guidance see Wikipedia Translation This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources AASHO Road Test news newspapers books scholar JSTOR February 2010 Learn how and when to remove this template message The AASHO Road Test was a series of experiments carried out by the American Association of State Highway and Transportation Officials AASHTO a to determine how traffic contributed to the deterioration of highway pavements AASHO Road Test Illinois Off Road Train Trailer used in the special test conducted after completion of regular test trafficContents 1 Methodology 2 See also 3 Notes 4 References 5 External linksMethodology editOfficially the Road Test was to study the performance of pavement structures of known thickness under moving loads of known magnitude and frequency citation needed This study carried out in the late 1950s in Ottawa Illinois is frequently quoted as a primary source of experimental data when vehicle wear to highways is considered for the purposes of road design vehicle taxation and costing The road test consisted of six two lane loops along the future alignment of Interstate 80 Each lane was subjected to repeated loading by a specific vehicle type and weight The pavement structure within each loop was varied so that the interaction of vehicle loads and pavement structure could be investigated Satellite studies were planned in other parts of the country so that climate and subgrade effects could be investigated but were never carried out The results from the AASHO road test were used to develop a pavement design guide first issued in 1961 as the AASHO Interim Guide for the Design of Rigid and Flexible Pavements with major updates issued in 1972 and 1993 The 1993 version is still in widespread use in the United States A new guide originally planned for release in 2002 but as yet still under development would be the first AASHTO pavement design guide not primarily based on the results of the AASHO Road Test The AASHO road test introduced many concepts in pavement engineering including the load equivalency factor Unsurprisingly the heavier vehicles reduced the serviceability in a much shorter time than light vehicles and the oft quoted figure called the generalized fourth power law 2 that damage caused by vehicles is related to the 4th power of their axle weight is derived from this The other direct result of the tests were new quality assurance standards for road construction in the US which are still in use today nbsp Contemporary historic place marker roadsign at the site The road test used large road user panels to establish the present serviceability rating PSR for each test section as the test proceeded Since panel ratings are expensive a substitute key parameter present serviceability index PSI was established The PSI is based on data on the road s longitudinal roughness patch work rutting and cracking Later studies have shown that PSI is mainly a fruit of unevenness with a correlation of more than 90 between the two Unevenness was measured with a mechanical profilograph reporting a parameter called slope variance SV SV is the second spatial derivative of height For a vehicle traveling at speed SV is the exciting source to vertical acceleration the second derivative in time domain of height This makes very good sense since 1 80 Hz acceleration is the parameter used when relating human exposure from vibration to perceived discomfort in the current ISO 2631 1 1997 standard Thus SV is physically linked to ride quality While the study is now quite old it is still frequently referenced though critics point out that its data is only valid under the specific conditions of the test with regard to the time place environment and material properties present during the test Extrapolating the data to different situations has been problematic 3 Other studies have attempted to refine the results either through further empirical studies or by developing mathematical models with varying success The AASHO study is still the most often quoted study on the subject however citation needed See also editRoad testNotes edit The American Association of State Highway Officials AASHO was renamed the American Association of State Highway and Transportation Officials AASHTO on November 13 1973 1 References edit Federal Highway Administration December 4 2012 November 13 Highway History Federal Highway Administration Retrieved August 18 2013 Equivalent Single Axle Load Pavement Interactive Pavement Interactive August 15 2007 Archived from the original on March 3 2016 Retrieved August 18 2014 Helwany Sam n d Finite Element Analyses of Flexible Pavements Archived from the original on February 15 2005 self published source External links edit nbsp Wikimedia Commons has media related to AASHO Road Test AASHO Road Test at Federal Highway Administration website Highway Research Board 1962 The AASHO Road Test Report 7 Summary Report PDF Washington DC National Academy of Sciences National Research Council via Transportation Research Board 41 22 05 N 88 54 31 W 41 3679338 N 88 9085183 W 41 3679338 88 9085183 Retrieved from https en wikipedia org w index php title AASHO Road Test amp oldid 1106189485, wikipedia, wiki, book, books, library,
