Effects of Lower Tire Pressure on Frost Weakened Roads.
Every year, thousands of miles of roads are closed or severely restricted to heavy traffic due to structural weakness during spring thaw. Spring thaw, as the period is known, varies in length depending on the severity of the winter. As thawing occurs, pavements become weak due to the high moisture c...
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ftdtic:ADA288404 2023-05-15T16:37:57+02:00 Effects of Lower Tire Pressure on Frost Weakened Roads. Sweet, Brian R. WASHINGTON UNIV SEATTLE 1994 text/html http://www.dtic.mil/docs/citations/ADA288404 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA288404 en eng http://www.dtic.mil/docs/citations/ADA288404 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Soil Mechanics Civil Engineering Snow Ice and Permafrost Surface Transportation and Equipment Test Facilities Equipment and Methods *COMPUTER PROGRAMS *PAVEMENTS *FRACTURE(MECHANICS) *ROADS *TIRES VOLUME LAYERS LOADS(FORCES) STRUCTURAL MECHANICS CRACKING(FRACTURING) STRUCTURES LOW PRESSURE ASPHALT SUBGRADES MOISTURE CONTENT COSTS WINTER FREEZING CONSTRUCTION FROST PAVEMENT BASES FROZEN SOILS THAWING GROUND TRAFFIC TRUCKS TIRE PRESSURE CTI(CENTRAL TIRE INFLATION) TRUCKING INDUSTRY Text 1994 ftdtic 2016-02-19T19:51:55Z Every year, thousands of miles of roads are closed or severely restricted to heavy traffic due to structural weakness during spring thaw. Spring thaw, as the period is known, varies in length depending on the severity of the winter. As thawing occurs, pavements become weak due to the high moisture content in the underlying base course and subgrade. In extreme cases, the base course and subgrade can become completely saturated and so weak that less than a hundred passes of an 18,000 pound axle will cause the pavement to fail. Most pavements with high traffic volumes in areas where roads are subject to freezing are designed to resist the effects of spring thaw. This type of construction can be expensive when it is considered that the depth of freeze can be over five (5) feet. Other methods used to resist the weakening caused by spring thaw usually increase construction costs. In this paper the results of a theoretical investigation of lower tire pressure on roads in a severely weakened condition such as is found in spring thaw are demonstrated. With the recent technological development of Central Tire Inflation (CTI) in the trucking industry, trucks may be able to operate on roads subject to load restrictions. CTI would allow trucks to operate at lower tire pressures on load restricted roads. The second chapter reviews the results of previous studies about the effects of tire pressure, axle loads, and tire type on pavement structures. In Chapter 3, the failure criterion used in this study are discussed. A computer software program designed to calculate strain in multi-layer systems called ELY8M6 was used to determine strains at the bottom of of the asphalt layer and top of subgrade. Text Ice permafrost Defense Technical Information Center: DTIC Technical Reports database |
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Defense Technical Information Center: DTIC Technical Reports database |
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ftdtic |
language |
English |
topic |
Soil Mechanics Civil Engineering Snow Ice and Permafrost Surface Transportation and Equipment Test Facilities Equipment and Methods *COMPUTER PROGRAMS *PAVEMENTS *FRACTURE(MECHANICS) *ROADS *TIRES VOLUME LAYERS LOADS(FORCES) STRUCTURAL MECHANICS CRACKING(FRACTURING) STRUCTURES LOW PRESSURE ASPHALT SUBGRADES MOISTURE CONTENT COSTS WINTER FREEZING CONSTRUCTION FROST PAVEMENT BASES FROZEN SOILS THAWING GROUND TRAFFIC TRUCKS TIRE PRESSURE CTI(CENTRAL TIRE INFLATION) TRUCKING INDUSTRY |
spellingShingle |
Soil Mechanics Civil Engineering Snow Ice and Permafrost Surface Transportation and Equipment Test Facilities Equipment and Methods *COMPUTER PROGRAMS *PAVEMENTS *FRACTURE(MECHANICS) *ROADS *TIRES VOLUME LAYERS LOADS(FORCES) STRUCTURAL MECHANICS CRACKING(FRACTURING) STRUCTURES LOW PRESSURE ASPHALT SUBGRADES MOISTURE CONTENT COSTS WINTER FREEZING CONSTRUCTION FROST PAVEMENT BASES FROZEN SOILS THAWING GROUND TRAFFIC TRUCKS TIRE PRESSURE CTI(CENTRAL TIRE INFLATION) TRUCKING INDUSTRY Sweet, Brian R. Effects of Lower Tire Pressure on Frost Weakened Roads. |
topic_facet |
Soil Mechanics Civil Engineering Snow Ice and Permafrost Surface Transportation and Equipment Test Facilities Equipment and Methods *COMPUTER PROGRAMS *PAVEMENTS *FRACTURE(MECHANICS) *ROADS *TIRES VOLUME LAYERS LOADS(FORCES) STRUCTURAL MECHANICS CRACKING(FRACTURING) STRUCTURES LOW PRESSURE ASPHALT SUBGRADES MOISTURE CONTENT COSTS WINTER FREEZING CONSTRUCTION FROST PAVEMENT BASES FROZEN SOILS THAWING GROUND TRAFFIC TRUCKS TIRE PRESSURE CTI(CENTRAL TIRE INFLATION) TRUCKING INDUSTRY |
description |
Every year, thousands of miles of roads are closed or severely restricted to heavy traffic due to structural weakness during spring thaw. Spring thaw, as the period is known, varies in length depending on the severity of the winter. As thawing occurs, pavements become weak due to the high moisture content in the underlying base course and subgrade. In extreme cases, the base course and subgrade can become completely saturated and so weak that less than a hundred passes of an 18,000 pound axle will cause the pavement to fail. Most pavements with high traffic volumes in areas where roads are subject to freezing are designed to resist the effects of spring thaw. This type of construction can be expensive when it is considered that the depth of freeze can be over five (5) feet. Other methods used to resist the weakening caused by spring thaw usually increase construction costs. In this paper the results of a theoretical investigation of lower tire pressure on roads in a severely weakened condition such as is found in spring thaw are demonstrated. With the recent technological development of Central Tire Inflation (CTI) in the trucking industry, trucks may be able to operate on roads subject to load restrictions. CTI would allow trucks to operate at lower tire pressures on load restricted roads. The second chapter reviews the results of previous studies about the effects of tire pressure, axle loads, and tire type on pavement structures. In Chapter 3, the failure criterion used in this study are discussed. A computer software program designed to calculate strain in multi-layer systems called ELY8M6 was used to determine strains at the bottom of of the asphalt layer and top of subgrade. |
author2 |
WASHINGTON UNIV SEATTLE |
format |
Text |
author |
Sweet, Brian R. |
author_facet |
Sweet, Brian R. |
author_sort |
Sweet, Brian R. |
title |
Effects of Lower Tire Pressure on Frost Weakened Roads. |
title_short |
Effects of Lower Tire Pressure on Frost Weakened Roads. |
title_full |
Effects of Lower Tire Pressure on Frost Weakened Roads. |
title_fullStr |
Effects of Lower Tire Pressure on Frost Weakened Roads. |
title_full_unstemmed |
Effects of Lower Tire Pressure on Frost Weakened Roads. |
title_sort |
effects of lower tire pressure on frost weakened roads. |
publishDate |
1994 |
url |
http://www.dtic.mil/docs/citations/ADA288404 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA288404 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA288404 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766028254275174400 |