W R Hudson
University of Texas at Austin
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Transportation Research Record | 1996
Cristopher Robinson; Muhammad Beg; Terry Dossey; W R Hudson
The development of distress prediction models for nonoverlaid portland cement concrete (rigid) pavements in Texas for the Texas Department of Transportations pavement management information system is described. The regression models presented quantitatively predict distress level versus pavement age and are based on pavement condition data maintained by the Center for Transportation Research at The University of Texas at Austin. Models are available for the following distress types in continuously reinforced concrete pavement (CRCP): punchouts, portland cement concrete patches, asphalt patches, serviceability loss as measured by loss of ride score, transverse crack spacing, and crack spalling. Preliminary models are available for the following distresses in jointed concrete pavement and jointed reinforced concrete pavement: patches, corner breaks, faulted joints and cracks, spalled joints and cracks, transverse crack spacing, and slabs with longitudinal cracks. A sigmoidal regression equation was used fo...
Transportation Research Record | 2000
Z Zhang; Joseph Leidy; Izydor Kawa; W R Hudson
Although the trend for the next generation of pavement design methods is shifting to mechanistic design, the use of design methods based on the AASHO road test results is still the current design practice in Texas and some other states. Critical to these design methods are the AASHTO load equivalency factors (LEFs), which are used to convert the mixed traffic axle loads into standard 18-kip (80.1-kN) equivalent single-axle loads. Several studies have been conducted on the subject of load equivalency for pavement design and analysis. However, there remain uncertainties related to various issues of load equivalency. Over the years, the composition and characteristics of traffic using Texas highways have been changing. The North American Free Trade Agreement has accelerated such changes in that more trucks, primarily moving among mid-western states, Texas, and Mexico, are traveling on Texas highways. In addition, the original AASHO road test was conducted at a site with environmental conditions significantly different from the environmental conditions in Texas. It is therefore critical to understand fully the impact of such changing traffic characteristics and environmental conditions on pavements in Texas. Presented is the methodology used to analyze the impact of these factors on the AASHTO LEFs.
Transportation Research Record | 2000
Muhammad Beg; Zhanmin Zhang; W R Hudson
A rational procedure is presented for evaluating alternative pavement types for roadway projects. Agency costs, user delay costs, and performance levels are important factors for comparing alternative pavement strategies. These factors are included in the evaluation procedure. Economic evaluations are based on life-cycle cost analysis. Cost-effectiveness analysis is also included in the procedure and uses area under the performance curve as a measure of the effectiveness of a pavement design strategy. Limitations in economic evaluations and the role of other miscellaneous factors in pavement type selection are also discussed. A computer program, TxPTS, was developed to automate the evaluation procedure. Case studies are presented demonstrating the use of the program.
NCHRP Report | 1987
S W Hudson; R F Carmichael Iii; L O Moser; W R Hudson; W J Wilkes
Archive | 1987
W R Hudson; G E Elkins; W Uddin; K T Reilley
Archive | 1988
Chia-pei J Chou; B F McCullough; W R Hudson; C L Saraf
Archive | 1997
W R Hudson; D Little; A M Razmi; Anderson; A Weissmann
Archive | 1993
N Singh; T Dossey; Jose Weissmann; W R Hudson
Pavement Management Implementation symposium, 1991, Atlantic City, New Jersey, USA | 1991
Sw Hudson; W R Hudson; Rf Carmichael
Archive | 1993
Claudia Said; Robert Harrison; W R Hudson