Surface Deflections Of Perpetual Pavement Sections
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Surface Deflections Of Perpetual Pavement Sections
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Author : Douglas A. Steele
language : en
Publisher:
Release Date : 2012
Surface Deflections Of Perpetual Pavement Sections written by Douglas A. Steele and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Falling-weight deflectometer (FWD) categories.
Structural evaluation provides valuable information at the network level of pavement management for project evaluation and prioritization purposes. However, due to the expenses involved in data collection and analysis, structural capacity is usually not evaluated at the network level. A rolling-wheel deflectometer (RWD), which measures surface deflections at highway speed, can be an alternate, faster method of pavement deflection evaluation for network-level data collection. This study was initiated in order to assess the feasibility of using an RWD for network-level pavement deflection measurements. RWD deflection data were collected under an 80 kN axle load and at a highway speed of about 88 km/h on four perpetual pavement sections in Kansas. Falling-weight deflectometer (FWD) data were also collected concurrently. The FWD first-sensor deflections were normalized to a load of 40 kN and then corrected to a temperature of 20° C. The RWD deflections were also corrected for temperature. FWD and RWD center deflections were then compared statistically. The results show that the deflections measured by RWD and the center (first sensor) deflections from the FWD are statistically similar. Furthermore, there is a linear relationship between FWD and RWD center deflections for all sections.
Field Verification Of Kdot S Superpave Mixture Properties To Be Used As Inputs In The Nchrp Mechanistic Empirical Pavement Design Guide
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Author : Daba Gedafa
language : en
Publisher:
Release Date : 2009
Field Verification Of Kdot S Superpave Mixture Properties To Be Used As Inputs In The Nchrp Mechanistic Empirical Pavement Design Guide written by Daba Gedafa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with CD-ROMs categories.
In the Mechanistic-Empirical Pavement Design Guide (M-EPDG), prediction of flexible pavement response and performance needs an input of dynamic modulus of hot-mix asphalt (HMA) at all three levels of hierarchical inputs. This study was intended to verify that this input modulus could be achieved in the field construction. Five newly built Superpave pavements for calibration of M-EPDG by the Kansas Department of Transportation and four Superpave pavement test sections on the Kansas perpetual pavement project on US-75 were selected as test sections in this study. Deflection data on all test sections was collected with a Dynatest 8000 Falling Weight Deflectometer. Normalized deflection data for all calibration sites and US-75 sections were used to back-calculate asphalt layer moduli using three backcalculation computer programs, EVERCALC, MODCOMP II and MODULUS. Laboratory dynamic modulus tests were conducted on asphalt concrete (AC) cores from five calibration sites and on laboratory-compacted samples from the US-75 perpetual pavement sections. Dynamic modulus was also predicted with the Witczak equation, new Witczak model and Hirsch model. The results show that the surface deflection was highly affected by the test temperature for calibration sites whereas test temperature and pavement thickness highly affected surface deflections for perpetual pavement sections. Repeating different target loads reduces nonlinearity significantly. Laboratory dynamic modulus on US marked highways is higher than on Kansas marked highways for the calibration sites.
Implementation And Thickness Optimization Of Perpetual Pavements In Ohio
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Author :
language : en
Publisher:
Release Date : 2015
Implementation And Thickness Optimization Of Perpetual Pavements In Ohio written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Pavements, Asphalt concrete categories.
This report documents the performance of perpetual pavement structures constructed by the Ohio Department of Transportation. Three perpetual pavement test sections on U.S. Route 23 in Delaware, Ohio (DEL-23) were constructed with AC thicknesses 11 in. (28 cm), 13 in. (33 cm), 15 in. (38 cm) and instrumented to detect strains in Fatigue Resistant Layer (FRL) and base layers, deflections, temperatures, and subgrade pressures. Strains at bottom of FRL during Controlled Vehicle Load (CVL) testing in summer indicated the 13 in. (33 cm) section on stabilized subgrade and 15 in. (38 cm) section on compacted subgrade met perpetual criteria, while 11 in. (28 cm) section on stabilized subgrade did not. Computer simulation of DEL-23 sections with PerRoad confirmed these findings, but also indicated the 11 in. (28 cm) section would meet perpetual pavement criteria. Test pavements were built in the Accelerated Pavement Load Facility (APLF) and instrumented similarly to DEL-23. The sections were thinner, but included Highly Modified Asphalt (HiMA) with Kraton polymer binder in sections of depth 8 in. (20 cm), 9 in. (23 cm), 10 in. (25 cm), and 11 in. (28 cm), the last using conventional asphalt in the base as a control with HiMA in upper layers. There was no FRL. The 10 in. (25 cm) and 11 in. (28 cm) sections met perpetual criteria even when heated through to 100° F (37.8° C). After enduring 10,000 passes of 9000 lb (40 kN) load at 5 mph (8 km/h), the surface rutting was measured with a profilometer and was considerably below even the ODOT threshold for "low rutting" (0.125 in. or 0.32 cm). An extrapolation of the curve fit suggested the HiMA surface would remain under the low rutting threshold much longer than conventional or WMA surfaces. Note these sections were built under ideal conditions, so field experience may differ. Fatigue endurance limit was computed using parameters measured in the laboratory asphalt mixture performance tester from samples collected from DEL-23 and APLF. Endurance limits computed following the NCHRP Project 9-44A method and MEPDG guide (E0=E*) provided a good fit with field results. Ten high-performing existing AC pavements from a previous forensic study (Sargand and Edwards, 2010) were further evaluated as potential perpetual pavements. Follow-up field investigations at each site included distress surveys, falling weight deflectometer (FWD) measurements, dynamic cone penetrometer (DCP) data, and Portable Seismic Property Analyzer (PSPA) measurements. Strains at the bottom of the asphalt were back calculated from FWD deflections using the elastic modulus program Evercalc. AC cores were collected and tested for indirect tensile strength and resilient modulus. The pavements were modeled using finite element software Abaqus, which confirmed the Evercalc strain computations. Of the ten pavements, seven appeared to meet conservative perpetual pavement strain criteria, one could be upgraded to meet perpetual pavement criteria by adding an additional asphalt layer, and two clearly did not meet perpetual pavement standards. A brief report on the status of previous perpetual pavement designs built in Stark County (STA-77) and Wayne County (WAY-30) is given.
Introduction To Unmanned Aircraft Systems Second Edition
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Author : Douglas M. Marshall
language : en
Publisher: CRC Press
Release Date : 2015-10-26
Introduction To Unmanned Aircraft Systems Second Edition written by Douglas M. Marshall and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-10-26 with Political Science categories.
The proliferation of technological capability, miniaturization, and demand for aerial intelligence is pushing unmanned aerial systems (UAS) into the realm of a multi-billion dollar industry. This book surveys the UAS landscape from history to future applications. It discusses commercial applications, integration into the national airspace system (NAS), System function, operational procedures, safety concerns, and a host of other relevant topics. The book is dynamic and well-illustrated with separate sections for terminology and web- based resources for further information.
Bearing Capacity Of Roads Railways And Airfields
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Author : Andreas Loizos
language : en
Publisher: CRC Press
Release Date : 2017-07-20
Bearing Capacity Of Roads Railways And Airfields written by Andreas Loizos and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-07-20 with Technology & Engineering categories.
Bearing Capacity of Roads, Railways and Airfields includes the contributions to the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields (BCRRA 2017, 28-30 June 2017, Athens, Greece). The papers cover aspects related to materials, laboratory testing, design, construction, maintenance and management systems of transport infrastructure, and focus on roads, railways and airfields. Additional aspects that concern new materials and characterization, alternative rehabilitation techniques, technological advances as well as pavement and railway track substructure sustainability are included. The contributions discuss new concepts and innovative solutions, and are concentrated but not limited on the following topics: · Unbound aggregate materials and soil properties · Bound materials characteritics, mechanical properties and testing · Effect of traffic loading · In-situ measurements techniques and monitoring · Structural evaluation · Pavement serviceability condition · Rehabilitation and maintenance issues · Geophysical assessment · Stabilization and reinforcement · Performance modeling · Environmental challenges · Life cycle assessment and sustainability Bearing Capacity of Roads, Railways and Airfields is essential reading for academics and professionals involved or interested in transport infrastructure systems, in particular roads, railways and airfields.
Advances In Pavement Design Through Full Scale Accelerated Pavement Testing
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Author : David Jones
language : en
Publisher: CRC Press
Release Date : 2012-10-08
Advances In Pavement Design Through Full Scale Accelerated Pavement Testing written by David Jones and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-10-08 with Technology & Engineering categories.
Pack: Book and CDInternationally, full-scale accelerated pavement testing, either on test roads or linear/circular test tracks, has proven to be a valuable tool that fills the gap between models and laboratory tests and long-term experiments on in-service pavements. Accelerated pavement testing is used to improve understanding of pavement behavior,
The Mechanistic Analysis Of Pavement Deflections On Subgrades Varying In Stiffness With Depth
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Author : Gustav Theodor Rohde
language : en
Publisher:
Release Date : 1990
The Mechanistic Analysis Of Pavement Deflections On Subgrades Varying In Stiffness With Depth written by Gustav Theodor Rohde and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Deformations (Mechanics) categories.
Strength And Deformation Characteristics Of Pavement Sections
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Author :
language : en
Publisher:
Release Date : 1994
Strength And Deformation Characteristics Of Pavement Sections written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Local transit categories.
Evaluation Of A Hot Mix Asphalt Perpetual Pavement
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Author :
language : en
Publisher:
Release Date : 2010
Evaluation Of A Hot Mix Asphalt Perpetual Pavement written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Pavements, Asphalt categories.
A Cooperative Study Of Structural Design Of Nonrigid Pavements
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Author : National Research Council (U.S.). Highway Research Board
language : en
Publisher:
Release Date : 1959
A Cooperative Study Of Structural Design Of Nonrigid Pavements written by National Research Council (U.S.). Highway Research Board and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1959 with Pavements categories.
A summary is presented of a comprehensive investigation of the structural behavior of a pavement of the flexible type constructed under carefully controlled conditions on a uniform comparatively poor subgrade. a brief review is presented of the material in previous reports with emphasis on the test methods and procedures developed. all loading tests reported were made statically by applying known loads to the surface, the base source or the subgrade, through rigid steel circular plates and measuring the resulting structure.