Download or read book Analysis of built in Curling and Warping in PCC Pavements written by Sarah K. Schmidt and published by . This book was released on 2001 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impact of Curling and Warping on Concrete Pavement written by Halil Ceylan and published by . This book was released on 2016 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: Portland cement concrete (PCC) pavement undergoes repeated environmental load-related deflection resulting from temperature and moisture variations across the pavement depth. This phenomenon, referred to as PCC pavement curling and warping, has been known and studied since the mid-1920s. Slab curvature can be further magnified under repeated traffic loads and may ultimately lead to fatigue failures, including top-down and bottom-up transverse, longitudinal, and corner cracking. It is therefore important to measure the “true” degree of curling and warping in PCC pavements, not only for quality control (QC) and quality assurance (QA) purposes, but also to achieve a better understanding of its relationship to long-term pavement performance. In order to better understand the curling and warping behavior of PCC pavements in Iowa and provide recommendations to mitigate curling and warping deflections, field investigations were performed at six existing sites during the late fall of 2015. These sites included PCC pavements with various ages, slab shapes, mix design aspects, and environmental conditions during construction. A stationary light detection and ranging (LiDAR) device was used to scan the slab surfaces. The degree of curling and warping along the longitudinal, transverse, and diagonal directions was calculated for the selected slabs based on the point clouds acquired using LiDAR. The results and findings are correlated to variations in pavement performance, mix design, pavement design, and construction details at each site. Recommendations regarding how to minimize curling and warping are provided based on a literature review and this field study. Some examples of using point cloud data to build three-dimensional (3D) models of the overall curvature of the slab shape are presented to show the feasibility of using this 3D analysis method for curling and warping analysis.
Download or read book PCC Pavement Acceptance Criteria for New Construction when Built in Curling Exists written by University of Michigan. Department of Civil and Environmental Engineering and published by . This book was released on 2008 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study's major objectives are two-fold: 1. Determine, from field and laboratory measurements, the magnitude of built-in curl/warp from a temperature gradient and moisture shrinkage gradient for Michigan conditions; and the resulting effect on JPCP resistance to mid-slab, top-down fatigue cracking. 2. Establish, based on these results and Finite Element analysis, critical values for built-in curl/warp to develop additional MDOT QC/QA acceptance criteria.
Download or read book Development and Evaluation of a Portable Device for Measuring Curling and Warping in Concrete Pavements written by Halil Ceylan and published by . This book was released on 2015 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: Portland cement concrete (PCC) pavement undergoes repeated environmental load-related deflection resulting from temperature and moisture variations across pavement depth. This has been recognized as resulting in PCC pavement curling and warping since the mid-1920s. Slab curvature can be further magnified under repeated traffic loads and may ultimately lead to fatigue failures, including top-down and bottom-up transverse, longitudinal, and corner cracking. It is therefore significant to measure the "true" degree of curling and warping in PCC pavements, not only for quality control (QC) and quality assurance (QA) purposes, but also for better understanding of its relationship to long-term pavement performance. Although several approaches and devices—including linear variable differential transducers (LVDTs), digital indicators, and some profilers—have been proposed for measuring curling and warping, their application in the field is subject to cost, inconvenience, and complexity of operation. This research therefore explores developing an economical and simple device for measuring curling and warping in concrete pavements with accuracy comparable to or better than existing methodologies. Technical requirements were identified to establish assessment criteria for development, and field tests were conducted to modify the device to further enhancement. The finalized device is about 12 inches in height and 18 pounds in weight, and its manufacturing cost is just $320. Detailed development procedures and evaluation results for the new curling and warping measuring device are presented and discussed, with a focus on achieving reliable curling and warping measurements in a cost effective manner.
Download or read book Curling and Warping of Concrete Pavement written by Nicole Carter and published by . This book was released on 2016 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project focuses on characterization of pavement behavior as it undergoes short-term curling and warping. Curling and warping cause slab deflections due to a temperature gradient and moisture gradient, respectively; this can result in excessive cracking and reduce the quality and lifetime of the pavement. In this study, one test section consisting of three panels was analyzed for early-age curling, warping, and shrinkage behavior. Deflection readings were taken on all three panels of the test section and one panel was instrumented with strain gages and moisture sensors. This procedure was a successful proof of concept in which we were able to determine that a relationship exists between strain, moisture, and deflection, indicating a relationship with curling and warping. Although data collected corresponds with the expected behavior, the amount of error produced from the test equipment and operators makes it difficult to accurately calculate deflection due to curling versus that due to warping.
Download or read book Numerical Study on the Curling and Warping of Hardened Rigid Pavement Slabs written by Yinghong Qin and published by . This book was released on 2011 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Field Evaluation of Built in Curling Levels in Rigid Pavements written by Rita E. Lederle and published by . This book was released on 2011 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project assesses the mechanisms and methods to assess built-in curling of jointed plain concrete pavements. Through the use of literature review or previous work, material, geometric, restraint, curing and local ambient relative humidity were found to be factors affecting both construction curl and drying shrinkage, leading to built-in curl of concrete slabs. Through the extensive use of a finite element program, an artificial neural network (ANN) was developed to backcalculate the built-in curl of an in-service concrete slab using falling-weight deflectometer testing for a variety of parameters. This ANN was used to evaluate existing concrete test cells at the MnROAD facility. In addition to non-destructive evaluations, significant studies into surface profiling of these same test cells was conducted to evaluate the most accurate and simplified method for evaluating built-in curl. While the nondestructive ANN method evaluates the interaction of the concrete slab with the underlying layers, the surface profiling method does not directly reflect this interaction, but instead gives an understand of the slab's curvature at the surface. Comparisons between these methods as well as between numerous different surface profiling methods were conducted.
Download or read book Design and Construction of PCC Pavements written by Leslie Titus-Glover and published by . This book was released on 1998 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization of Effective Built in Curling and Concrete Pavement Cracking on the Palmdale Test Sections written by Shreenath Rao and published by . This book was released on 2005 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of the Effect of Curling on As constructed Smoothness and Ride Quality of KDOT Portland Cement Concrete PCC Pavements written by Zahidul Siddique and published by . This book was released on 2004 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental effects such as temperature and/or moisture gradient across the thickness of the concrete pavement slab can cause curling, which also affects the roughness. In this report, the effect of curling on as-constructed smoothness as well as early-life roughness of Portland Cement Concrete Pavements (PCCP) was investigated. Twelve test sections on six newly built concrete pavement projects on Interstate routes 70 and 135 were selected. Periodic longitudinal profile data was collected by a South Dakota-type profiler on each wheel path of both the driving and passing lanes. A digital method was developed to separate curling from the longitudinal profile using Fast Fourier Transform (FFT). International Roughness Index (IRI) values were calculated for the original profile, curled profile, and profile without curling. The contribution of curling to the measured roughness was found to be significant.
Download or read book Impact of Temperature Curling and Moisture Warping on Jointed Concrete Pavement Performance written by United States. Federal Highway Administration. Office of Pavement Technology and published by . This book was released on 2010 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: This TechBrief summarizes the results of a study on curling and warping in jointed concrete pavement (JCP). Profile measurements, following quality assurance plans developed under the study, were collected in all U.S. climate zones, diurnal periods, and seasons of the year to obtain sufficient data to fully characterize slab curvatures. Both functional and structural pavement performance were measured to correlate performance to curling and warping. Products of the study include a new technique that quantifies the magnitude of JCP curling and warping and a system to assess the influence of diurnal and seasonal changes on JCP curvature and pavement unevenness.
Download or read book A High Speed Profiler Based Slab Curvature Index for Jointed Concrete Pavement Curling and Warping Analysis written by Christopher Ronald Byrum and published by . This book was released on 2001 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Causes of Curling of P C C Pavement written by and published by . This book was released on 1954 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluating the Effects of Concrete Pavement Curling and Warping on Ride Quality written by David K. Merritt and published by . This book was released on 2015 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Field Evaluation of Concrete Pavement Curling and Warping Responses written by Matthew James Sheehan and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Early and Long term Effects of Curling and Warping on Jointed Concrete Pavement written by Matthew J. Sheehan and published by . This book was released on 1996 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Curl and Warp Analysis of the LTPP SPS 2 Site in Arizona written by Steven M. Karamihas and published by . This book was released on 2012 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examined the roughness and roughness progression of 21 test sections on the e Long-Term Pavement Performance (LTPP) Specific Pavement Studies (SPS)-2 site in Arizona over the first 16 years of the experiment. The site included 12 test sections from the standard experiment and 9 supplemental test sections selected by the Arizona Department of Transportation. Traditional profile analyses revealed roughness caused by transverse and longitudinal cracking on some test sections and some localized roughness caused by built-in defects. However, the analyses showed that curl and warp contributed to, and in some cases dominated, the roughness on many of the test sections. In addition, roughness did not increase steadily with time because of diurnal and seasonal changes in slab curl and warp. This study applied objective profile analyses to quantify the level of curl and warp on each section. These automated algorithms estimated the gross strain gradient needed to deform each slab into the shape present in the measured profile and produced a pseudo strain gradient (PSG) value. The levels of curl and warp within each profile are summarized by the average PSG value. For the jointed concrete test sections, variations in average PSG over time explained many of the changes in roughness over time. This included diurnal variations in slab curl, which often caused the overall progression in roughness to appear disorderly throughout the experiment. PSG analysis also revealed that the overall level of curl and warp increased throughout the life of the experiment, with commensurate increases in the roughness. This limited study demonstrated the potential value of applying the methods herein to other jointed portland cement concrete pavements, including other SPS-2 sites.
