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 Impact of Curling Warping and Other Early age Behavior on Concrete Pavement Smoothness written by and published by . This book was released on 2007 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the activities in Phase II of "Assessing the Impact to Concrete Pavement Smoothness from Curling, Warping, and other Early-Age Behavior: Early, Frequent, and Detailed (Project 16)." The purpose of this report is to obtain detailed information about factors affecting pavement smoothness during the critical time immediately following construction by conducting a controlled field evaluation of three concrete pavement construction projects. In Phase II, both field and laboratory testing of the materials and construction process were conducted for two newly constructed Jointed Plain Concrete Pavement (JPCP) test sections; one on highway U.S. 34 near Burlington and the other on U.S. 30 near Marshalltown, Iowa. Extensive pavement profiling was also performed during strategic times after placement. This report fulfills the remaining requirements of Phase II. As a whole, the data collection effort undertaken by the project team was a success. The result of this project is a large amount of quality data on the early-age effects of curling and warping on pavement smoothness. By using the data from this research and by using the mathematical models developed as part of current FHWA studies and elsewhere, the complex relationships between concrete pavements curling, warping, and other early-age behavior and pavement smoothness were discussed and presented. This study shows that the curling and warping behaviors at early ages are influenced not only by temperature variation but also by other environmental effects such as the moisture variation, drying shrinkage, and temperature conditions during pavement construction. Within the scope of this project, it can be concluded that measurable changes of early-age pavement smoothness do occur over time from the standpoint of smoothness specifications.

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 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 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 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 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 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 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 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 Warping and Curling of Plain Concrete Slabs written by Vipinbhai R. Shah and published by . This book was released on 1965 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The study was made to determine the effect of daily atmospheric temperature variation and curing on the warping and curling of plain concrete slabs and to study the effect of moisture on the warping of plain concrete slabs under nearly constant temperature conditions, by keeping the bottom surface of one slab wet and the other dry. Daily observations consisted of dial gage readings to determine the progressive variations in warping contours due to typical daily temperature curling. Trends were found for three months of dial gage readings and interpreted in terms of warping and curling of the slabs. The warping of outdoor slabs is much larger in magnitude than indoor slabs. The slab whose bottom surface was kept wet showed a slightly greater warping than the dry slab"--Abstract, leaf ii.

Download or read book Aggregates in Concrete written by Mark Alexander and published by CRC Press. This book was released on 2010-02-25 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bringing together in one volume the latest research and information, this book provides a detailed guide to the selection and use of aggregates in concrete. After an introduction defining the purpose and role of aggregates in concrete, the authors present an overview of aggregate sources and production techniques, followed by a detailed study of their physical, mechanical and chemical properties. This knowledge is then applied to the use of aggregates in both plastic and hardened concretes, and in the overall mix design. Special aggregates and their applications are discussed in detail, as are the current main specifications, standards and tests.

Download or read book Achieving a High Level of Smoothness in Concrete Pavements Without Sacrificing Long Term Performance written by and published by . This book was released on 2005 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a PCC pavement, it is important to achieve both a high level of smoothness during construction, as well as a satisfactory long-term performance. It is not acceptable to construct a pavement with a high initial smoothness that will give poor long-term performance. The design features and material properties of the PCC pavement should be conducive to yielding satisfactory long-term performance. Smoothness measurements for construction acceptance are usually performed shortly after paving is completed. The results from the smoothness measurements are used to judge whether the pavement has achieved the specified smoothness level. However, it is unclear whether the smoothness of a pavement measured immediately after it is paved truly reflects the initial smoothness of the pavement because the smoothness may undergo changes over the short term (e. g. within 3 months) due to curling or warping effects. This report: 1) assesses whether high initial smoothness translates into better long-term performance, 2) identifies design features and material properties in PCC pavements that can cause an initially smooth pavement to exhibit detrimental long-term performance, 3) provides guidance on materials properties, design features, and construction procedures to avoid these detrimental effects, 4) investigates how the smoothness of a PCC pavement measured immediately after construction can change over the short term (within the first 3 months), and 5) looks at data collection issues related to lightweight inertial profilers.

Download or read book Integrated Materials and Construction Practices for Concrete Pavement written by and published by . This book was released on 2006 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manual of integrated material and construction practices for concrete pavements.

Download or read book Concrete Pavement Design Construction and Performance written by Norbert Delatte and published by CRC Press. This book was released on 2007-09-12 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: Addressing the interactions between the different design and construction variables and techniques this book illustrates best practices for constructing economical, long life concrete pavements. The book proceeds in much the same way as a pavement construction project. First, different alternatives for concrete pavement solutions are outlined. The desired performance and behaviour parameters are identified. Next, appropriate materials are outlined and the most suitable concrete proportions determined. The design can be completed, and then the necessary construction steps for translating the design into a durable facility are carried out. Although the focus reflects highways as the most common application, special features of airport, industrial, and light duty pavements are also addressed. Use is made of modeling and performance tools such as HIPERPAV and LTPP to illustrate behavior and performance, along with some case studies. As concrete pavements are more complex than they seem, and the costs of mistakes or of over-design can be high, this is a valuable book for engineers in both the public and private sectors.

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 Concrete Pavement Design Manual written by and published by . This book was released on 1992 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: