Download or read book Monitoring Seasonal Instrumentation and Modeling Climatic Effects on Pavements at the Ohio SHRP Test Road written by Andrew G. Heydinger and published by . This book was released on 2003 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Long-Term Pavement Performance (LTPP) Seasonal Monitoring program (SMP) instrumentation was installed in pavement sections at the Ohio SHRP Test Road. The pavements are monitored for the seasonal variations of moisture, temperature and frost penetration. Data from the instrumentation is subjected to quality checks and prepared for uploading to the FHWA Information Management System (IMS). Findings from the testing are to be incorporated into future pavement design procedures.
Download or read book Ohio Test Road Seasonal Instrumentation written by and published by . This book was released on 1997 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of both flexible and rigid pavements depends not only on the effects of traffic but also of the environment. As part of the FHWA Strategic Highway Research Program (SHRP), a test road was recently constructed on U.S. 23 just north of Delaware, Ohio. This road includes four different sets of sections to study various factors affecting pavement performance. Monitoring seasonal (environmental) factors is of extreme importance as they affect subgrade soil and pavement layer properties and subsequently pavement life and performance. Installation and monitoring of eighteen seasonal instrumentation sites as well as monitoring of a complete weather station is described. Both subgrade soil moisture content, pavement and subgrade temperature, and frost depth are periodically monitored at each location, along with weather-related factors such as air temperature, rainfall, solar radiation, relative humidity, wind speed, and wind direction at a complete weather station. The methodology to check the quality of the data is presented along with preliminary results and correlations of use in the eventual development of a mechanistic pavement design procedure. Finite elements computer analyses were also conducted to determine the influence of seasonal factors on the response of flexible pavements (in the form of deflections, stresses and strains) to traffic loads[.] [sic] Specifically, equations were developed to correlate AC temperatures with hourly ambient air temperatures to ultimately determine the resilient modulus. Using material test results from a parallel study, finite element analyses were conducted on actual pavement sections using the program ILLIPAVE. Results show reasonably accurate comparisons for stress, strain, and deflections between pavements modeled with a constant average modulus and those modeled with multiple layers having moduli established by temperature. However, key parameters such as surface deflection and radial strain do not show comparisons justifiable for using constant moduli analyses.
Download or read book Seasonal Instrumentation of SHRP Pavements written by Andrew G. Heydinger and published by . This book was released on 1998 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seasonal Monitoring Program (SMP) instrumentation was installed in five sections at the Ohio Test Pavement in Delaware County, Ohio using Strategic Highway Research Program (SHRP) protocols developed for the Long-Term Pavement Performance (LTPP) group to the Federal Highway Administration (FHWA). The SMP instrumentation monitors pavements for temperature and pavement bases and subgrade soils for variations in moisture, temperature, and frost penetration. Time Domain Reflectometry (TDR) instrumentation was installed onsite in two sections for monitoring the moisture. Thermal conductivity sensors (TCS) were installed in four sections to measure soil moisture suction. Laboratory soil-water characteristic tests were conducted on remolded subgrade soil.--The TDR volumetric moisture contents typically varied by 10% to 15% from the driest to the wettest periods, but sometimes the variations were larger. The lower water contents occurred during the late winter/early spring months and the higher contents occurred during the late summer/early fall months. This reflects the climatic conditions that occurred. Some of the TDR moisture contents exceeded 40%, wich is greater than the soil porosity and therefore not possible. An equation for TDR volumetric water content developed for the FHWA yields lower water contents. Most of the thermal conductivity sensors are no longer within calibration. Data from sensors in calibration indicate very low matric suctions, which is consistent with high water contents. Soil-water characteristic relationships were obtained for the subgrade soil using trizxial and pressure plate apparatus. The relationships from the two tests are comparable. The soil exhibits some hysteresis when comparing drying and wetting curves.
Download or read book Seasonal Instrumentation of SHRP Pavements the Ohio State University written by William Edward Wolfe and published by . This book was released on 1998 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental instruments to measure temperature, soil moisture and frost depth were installed at five test sections of the SHRP pavement project on U.S. 23 north of Delaware, Ohio. At three of these locations tensiometers, which a designed to measure negative pore pressures, were added to the instrumentation package. The pore pressures as recorded by the tensiometers have increased from initially negative to positive values at each location and throughout the profile in the first year after installation of the instrument package was completed. At the same time, data collected from the moisture probes were showing a corresponding increase in soil moisture content. Samples of an aggregate base and clayey subgrade material were collected at several locations on the DEL 23 project by ODOT. They were delivered to the OSU soil mechanics laboratory for classification and permeability determination. The aggregate base conformed to ODOT material specification Item 304. Measured permeability coefficients ranged between 2x10 [to the minus 2] and 2.9x10 [to the minus 2] cm /sec. The clayey material was classified as a low plasticity clay (AASHTO Classification A-6 to A-7-6) with permeability coefficients ranging between 1x10 [to the minus 6] and 4x10 [to the minus 8] cm/sec.
Download or read book Evaluation of the Integrated Model for Climatic Effects at the Ohio Test Pavement written by Sandeep Tilak and published by . This book was released on 1998 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long Term Monitoring of Moisture Under Pavements written by William Edward Wolfe and published by . This book was released on 2010 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monitoring of the environmental instrumentation installed under select pavement sections constructed by the Ohio Department of Transportation (ODOT) in 1995 on US 23 in Delaware County, Ohio was continued. The measurements made consisted of soil moisture, temperature and frost depth profiles.
Download or read book Seasonal Instrumentation of SHRP Pavements written by William Edward Wolfe and published by . This book was released on 2004 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: Test pavements constructed by the Ohio Department of Transportation (ODOT) on U.S. 23 in Delaware, OH were studied. Environmental data collected from 1997 to 2003 at five test locations are presented. Also, porewater pressures in the near surface soils beneath select pavement sections were measured. These measurements showed that pore pressures in the soil under the pavement have continued to increase over time strongly suggesting that the subsurface soils quickly became saturated as water was drawn up into the profile. Models used to predict the resilient modulus of cohesive subgrade soils typical of those found in Ohio were evaluated. The current study consisted of performing a series of static laboratory tests to determine the soil's engineering properties. These tests were followed by the direct measurement of the resilient modulus. Tests were performed on both unsaturated and saturated soil samples. The moduli as predicted by these existing methods were compared with the measured values. An improved and more accurate resilient modulus prediction model has been developed and validated in this study. Results obtained from M[subscribt r] laboratory testing show that for cohesive soils, the water content, the applied deviator stress, the confining stress and the unconfined compressive strength all affected the resilient modulus of the sample. The resilient modulus values of the saturated soil samples were, in most cases, less than half that of the modulus at optimum moisture content.
Download or read book Development of an Instrumentation Plan for the Ohio SPS Test Pavement DEL 23 17 48 written by Shad M. Sargand and published by . This book was released on 1994 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Specific Pavement Studies (SPS) program, formulated under the Strategic Highway Research Program (SHRP), consists of nine experiments, four of which will be included in this DEL-23 project. Since the basic instrumentation plan proposed by SHRP was limited, Ohio Department of Transportation opted to develop a more comprehensive plan for DEL-23. The Ohio Test Road consists of SPS-1, SPS-2, SPS-8, and SPS-9 experiments, all constructed for this project where the climate, soil, and topography are uniform throughout. In this comprehensive instrumentation plan, thirty-three sections are to be instrumented. LTPP guidelines require four instrumented sections in each of the SPS-1 and SPS-2 experiments for the study of seasonal factors and dynamic response. DEL-23 includes an additional nine instrumented sections for the SPS-1 experiment, twelve sections for the SPS-2 experiment, and two sections each in the SPS-8 and SPS-9 experiments to study structural response parameters. A total of eighteen sections will be instrumented for the study of seasonal factors, ten more sections than required by SHRF. This report provides a detailed description of types of sensors, installation and methodology, calibration procedures and wiring schematics for instrumentation of pavements for the Ohio SHRP SPS Test Road to measure environmental factors and structural response. Environmental or climatic paramaters include temperature, base and subbase moisture, and frost depth. Structural response parameters entail strain, deflection, pressure and joint opening.
Download or read book Transportation Research Record written by and published by . This book was released on 2003 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Highway Research Abstracts written by and published by . This book was released on 1994 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guidelines for Implementing NCHRP 1 37A M E Design Procedures Literature review written by and published by . This book was released on 2009 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Global Climate Change Impacts in the United States written by U.S. Global Change Research Program and published by Cambridge University Press. This book was released on 2009-08-24 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summarizes the science of climate change and impacts on the United States, for the public and policymakers.
Download or read book Nondestructive Evaluation of Bridges and Highways written by and published by . This book was released on 1996 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Binder Characterization and Evaluation written by David A. Anderson and published by Strategic Highway Research Program (Shrp). This book was released on 1994 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water in Road Structures written by Andrew Dawson and published by Springer Science & Business Media. This book was released on 2008-10-21 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Only book world-wide addressing this topic. The principal output of the European co-operative Action on "Water Movements in Road Pavements & Embankments". Provides unique guidance on assessing water condition and its affects on road performance. Provides unique guidance on assessing and ameliorating contaminant movement in pavement groundwater. Written by leading experts in Europe.
Download or read book Pavement Analysis and Design written by Yang Hsien Huang and published by . This book was released on 2004 with total page 775 pages. Available in PDF, EPUB and Kindle. Book excerpt: For one/two-semester, undergraduate/graduate courses in Pavement Design. This up-to-date text covers both theoretical and practical aspects of pavement analysis and design. It includes some of the latest developments in the field, and some very useful computer software-developed by the author-with detailed instructions.
Download or read book Potential Impacts of Climate Change on U S Transportation written by Division on Earth and Life Studies and published by National Academies Press. This book was released on 2008-07-16 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Transportation Research Board (TRB) and the Division on Earth and Life Studies (DELS) have released the pre-publication version of TRB Special Report 290, The Potential Impacts of Climate Change on U.S. Transportation, which explores the consequences of climate change for U.S. transportation infrastructure and operations. The report provides an overview of the scientific consensus on the current and future climate changes of particular relevance to U.S. transportation, including the limits of present scientific understanding as to their precise timing, magnitude, and geographic location; identifies potential impacts on U.S. transportation and adaptation options; and offers recommendations for both research and actions that can be taken to prepare for climate change. The book also summarizes previous work on strategies for reducing transportation-related emissions of carbon dioxide--the primary greenhouse gas--that contribute to climate change. Five commissioned papers used by the committee to help develop the report, a summary of the report, and a National Academies press release associated with the report are available online. DELS, like TRB, is a division of the National Academies, which include the National Academy of Sciences, National Academy of Engineering, Institute of Medicine, and National Research Council.
