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Author: Publisher: ISBN: Category : Pavements Languages : en Pages : 126
Book Description
Highway agencies across the nation are moving towards implementation of the new AASHTO Mechanistic-Empirical Pavement Design Guide (MEPDG) for pavement design. The benefits of implementing the MEPDG for routine use in Ohio includes (1) achieving more cost effective and reliable pavement designs, (2) lower initial and life cycle costs to the agency, and (3) reduced highway user impact due to lane closures for maintenance and rehabilitation of pavements. Implementation of the MEPDG is a process that requires time and agency resources (staffing, training, testing facilities including equipment, and so on). A key requirement is validating the MEPDG's nationally calibrated pavement distress and smoothness prediction models when applied under Ohio conditions and performing local calibration if needed. Feasibility of using the MEPDG's national models in Ohio was investigated under this study using data from a limited number of LTPP projects located in Ohio. Results based on limited data showed inadequate goodness of fit and significant bias in a number of the MEPDG new HMA pavement and JPCP performance prediction models. Limited recalibration of these models showed promising results indicating that a full-scale recalibration effort using a more extensive database assembled from projects located throughout the state is feasible.
Author: Publisher: ISBN: Category : Pavements Languages : en Pages : 126
Book Description
Highway agencies across the nation are moving towards implementation of the new AASHTO Mechanistic-Empirical Pavement Design Guide (MEPDG) for pavement design. The benefits of implementing the MEPDG for routine use in Ohio includes (1) achieving more cost effective and reliable pavement designs, (2) lower initial and life cycle costs to the agency, and (3) reduced highway user impact due to lane closures for maintenance and rehabilitation of pavements. Implementation of the MEPDG is a process that requires time and agency resources (staffing, training, testing facilities including equipment, and so on). A key requirement is validating the MEPDG's nationally calibrated pavement distress and smoothness prediction models when applied under Ohio conditions and performing local calibration if needed. Feasibility of using the MEPDG's national models in Ohio was investigated under this study using data from a limited number of LTPP projects located in Ohio. Results based on limited data showed inadequate goodness of fit and significant bias in a number of the MEPDG new HMA pavement and JPCP performance prediction models. Limited recalibration of these models showed promising results indicating that a full-scale recalibration effort using a more extensive database assembled from projects located throughout the state is feasible.
Author: J. B. Metcalf Publisher: Transportation Research Board ISBN: 9780309060080 Category : Accelerated life testing Languages : en Pages : 120
Book Description
This synthesis, which describes the state of the practice for full- scale accelerated pavement testing (APT), will be of interest to state department of transportation (DOT) pavement design and materials engineers; DOT research staff, including field and laboratory materials testing personnel; and private industry APT equipment suppliers. State DOT administration and management personnel will have a particular interest in the application of APT results toward more efficient and effective pavement designs. Local transportation agencies may also have an interest in the topic. This synthesis reviews the capabilities and limitations of the major APT facilities available worldwide and describes the role and application of full-scale accelerated pavement testing in the development of pavement technology. This report of the Transportation Research Board (TRB) presents data obtained from a review of the literature and a survey of the state DOTs, Canadian transportation agencies, and international organizations. A brief historical overview of APT, a discussion of the application of APT to research, and the application of APT to practice are included. Profiles of APT facilities throughout the world are included in an appendix.
Author: Shad M. Sargand Publisher: ISBN: Category : Pavements Languages : en Pages : 264
Book Description
The US Route 30 bypass of Wooster, Ohio, in Wayne County, "WAY-30", was constructed to demonstrate two types of extended service pavements, a long-life Portland cement concrete (PCC) pavement on the eastbound lanes and an asphalt concrete (AC) perpetual pavement on the westbound lanes. Both pavements are designed to provide 50 years or more of service with minimal maintenance (e.g. resurfacing). The PCC pavement structure features a thick and extra-wide slab on an asphalt treated base, while the AC pavement structure features a Superpave surface and a Fatigue Resistant Layer (FRL). Two sections in each direction were instrumented with pressure cells to monitor subgrade pressures and deep and shallow LVDTs to record pavement deflections. The AC test section also had transverse and longitudinal strain gages. A weather station was also used to monitor environmental conditions. Nondestructive testing of the subgrade was conducted prior to pavement placement. Pavement materials and samples were tested in the laboratory to determine material parameters. Controlled vehicle load and falling weight deflectometer tests were applied to the AC pavement shortly after the road opened to traffic in December 2005 and again under hot weather conditions in July 2006. Similar tests on the PCC pavement were conducted in December 2005 and August 2006. The response on both types of pavement met their respective design criteria. A verification analysis of the AC pavement response using the elastic layer system (ELS) simulation using material properties derived from laboratory and field sample data yielded unsatisfactory matches, suggesting that some refinement of the approach is needed
Author: Publisher: ISBN: Category : Pavements Languages : en Pages : 164
Book Description
Performance and environmental data continued to be monitored throughout this study on the Ohio SHRP Test Road. Response testing included three new series of controlled vehicle tests and two sets of nondestructive tests. Cracking in two SPS-2 sections with lean concrete base confirmed observations elsewhere that PCC pavement may not perform well when placed on rigid base. Of the five types of base material used on LOG 33 and evaluated for their effect on AC pavement performance, deflection measurements on the asphalt treated base fluctuated most with changes in temperature. None of the other bases were sensitive to temperature. Cement treated base had the lowest deflection. On unbound material, bases containing large size stone gave the lowest deflection. The preponderance of data collected in the laboratory and at the ERI/LOR 2 site suggests that PCC pavement performs poorly on 307 NJ and CTFD bases. All sections with 25-foot slabs, except those with ATFD base, and the section with 13-foot slabs on 307 NJ base had significant transverse cracking. The 13-foot long slabs with 307 NJ base also had some longitudinal cracking. Considering the relatively short time these pavement sections had been in service, this level of performance was considered unacceptable. The ATFD base appeared to be performing best. On JAC/GAL 35, subgrade stiffness had a significant effect on dowel bar response. Looseness around dowel bars affected their ability to transfer load. Larger diameter and stiffer dowel bars provided better load transfer across PCC joints. The most effective dowel bar in these tests was the 1.5" diameter steel bar. The performance of 1" steel dowel bars were similar to 1.5" fiberglass bars. One-inch diameter fiberglass dowel bars were not recommended for PCC pavement. While undercutting PCC joint repairs initially reduced the forces in dowel bars, the effectiveness of the undercut diminished over time. Dowel bar forces were about the same in the Y and YU types of joint repairs after some time.
Author: H. R. Pasindu Publisher: Springer Nature ISBN: 303087379X Category : Technology & Engineering Languages : en Pages : 917
Book Description
This volume gathers the latest advances, innovations, and applications in the field of pavement technology, presented at the 12th International Conference in Road and Airfield Pavement Technology (ICPT), hosted by the University of Moratuwa, Sri Lanka, and held on July 14-16, 2021. It covers topics such as pavement design, evaluation and construction, pavement materials characterization, sustainability in pavement engineering, pavement maintenance and rehabilitation techniques, pavement management systems and financing, transportation safety, law and enforcement related to pavement engineering, pavement drainage and erosion control, GIS applications, quarry material assessment, pavement instrumentation, IT and AI applications in pavement. Featuring peer-reviewed contributions by leading international researchers and engineers, the book is a timely and highly relevant resource for materials scientists and engineers interested in pavement engineering.
Author: Hui Li Publisher: Butterworth-Heinemann ISBN: 0128034963 Category : Technology & Engineering Languages : en Pages : 389
Book Description
About 90 percent of this excessive heat is due to buildings and pavements that absorb and store solar heat (According to the Green Buildings Council). The only reference that focuses specifically on pavements, Pavement Materials for Heat Island Mitigation: Design and Management Strategies explores different advanced paving materials, their properties, and their associated advantages and disadvantages. Relevant properties of pavement materials (e.g. albedo, permeability, thermal conductivity, heat capacity and evaporation rate) are measured in many cases using newly developed methods. - Includes experimental methods for testing different types of pavements materials - Identifies different cool pavement strategies with their advantages and associated disadvantages - Design and construct local microclimate models to evaluate and validate different cool pavement materials in different climate regions
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Author: Hui Li