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Abstract : This study aimed to investigate the use of wide base tires (WBT) in Michigan to quantify the effect of different percentages of WBT loads on flexible and rigid pavements. Surveys and field investigations were conducted to quantify the WBT usage in Michigan. The JULEA (for flexible pavements) and Illislab (for JPCP) software programs were used to calculate the mechanical response between dual tire (DT) and WBT loads, while the Mechanical-Empirical (ME) pavement design process was utilized for damage accumulation and pavement distress analysis. Investigation results rationalized the assumption of WBT proportion for design purposes as 10% currently and up to 25% in the future for Michigan with the majority of axles load still employing DT assemblies. WBT loads were found to increase pavement distress mechanistically using this process, with fatigue cracking for flexible pavement and faulting for JPCP most critical. Thicker asphalt concrete (AC) layers were beneficial in reducing WBT impact on fatigue cracking, while rutting was much less impacted by the thickness of the AC layer under WBT using the ME design process. Thicker concrete slabs helped reduce WBT impacts on both transverse cracking and faulting for JPCP. It was also found that WBT loads did not affect the international roughness index (IRI) significantly for both flexible and JPCP using a process adapted from the Pavement ME analysis. Based on analysis results, the WBT impact on pavement structures with 5-12" AC layers or 6-13" PCC slabs were quantified for up to 25% WBTs, with the respective adjusted Pavement ME and AASHTO 93 design threshold and recommendation for implementation.
Current operating practice in the trucking industry related to tire pressures and truck tires are summarized. Findings of recent (since 1987) pertiment pavement performance research including both full-scale and analytical pavement response and performance studies are discussed. Pertinent findings developed in previous literature reviews are also included. Regulatory approaches developed by the various states based on information from a telephone survey conducted during July and August 1991 are included. Economic analyses are used to compare the increased annualized bituminous pavement rehabilitation costs with trucking industry benefits. Recommendations regarding the regulation of wide-base truck tires are presented.
This paper provides a summary of the findings on an ontario study focussing on the operational characteristics of wide-base tires and their impact on pavements. wide-base tires are compared to those of conventional dual tires in terms of their allowable load limits, inflation pressures and fuel economy. information for this part of the study was collected to a large extent from tire and trucking industry surveys. it is concluded that the operation of wide-base tires can be an economically feasible alternative in spite of their lower allowable load limits. a review of available literature indicates that without exception, wide-base tires are more damaging than conventional dual tires. depending on the criteria and method used, respective equivalent loads range from 44 to 7n kn versus the standards 80 kn axle load on conventional dual tires. for the covering abstract of the conference see irrd 807058.
Structural Behavior of Asphalt Pavements provides engineers and researchers with a detailed guide to the structural behavioral dynamics of asphalt pavement including: pavement temperature distribution, mechanistic response of pavement structure under the application of heavy vehicles, distress mechanism of pavement, and pavement deterioration performance and dynamic equations. An authoritative guide for understanding the key mechanisms for creating longer lasting pavements, Structural Behavior of Asphalt Pavements describes the intrinsic consistency between macroscopic performance and microscopic response, structure and material, as well as global and local performances, and demonstrates the process of pavement analyses and designs, approaching science from empirical analyses. - Analyzes the external and internal factors influencing pavement temperature field, and provide a review of existing pavement temperature prediction models - Introduces a "Bridge Principle through which pavement performance and fatigue properties are consolidated - Defines the intrinsic consistency between macroscopic performance and microscopic response, structure and material, as well as global and local performance - Summaries the mechanistic response of pavement structure under the application of heavy vehicle, distress mechanism of pavement, pavement deterioration performance and dynamic equations, and life cycle analysis of pavement
The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.