Download or read book Determination of Coefficient of Thermal Expansion Effects on Louisiana s PCC Pavement Design written by Hak-Chul Shin and published by . This book was released on 2009 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: PROBLEM: The coefficient of thermal expansion (CTE) is a fundamental property of construction materials such as steel and concrete. Although the CTE of steel is a well-defined constant, the CTE of concrete varies substantially with aggregate type, mix design, and moisture condition. The Mechanistic-Empirical Pavement Design Guide (MEPDG) demonstrates the importance of CTE in design and performance of Portland cement concrete (PCC) pavements. It is known that CTE has significant effects on slab cracking, curling and warping, joint faulting, and pavement smoothness. A better understanding of CTE effects on performance of Louisiana's PCC pavements is needed. OBJECTIVE: After summarizing the current practice for measuring CTE of PCC, the researcher will determine the variance of CTE for concrete mixes used in Louisiana and provide recommendations for use of CTE in PCC pavement design. Additionally, the current specification for maximum spacing of transverse joints in jointed plain concrete pavement (JPCP) will be evaluated.
Download or read book Determination of Coefficient of Thermal Expansion Effects on Louisiana s PCC Pavement Design written by Hak-Chul Shin and published by . This book was released on 2011 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the development of the Mechanistic Empirical Pavement Design Guide (MEPDG) as a new pavement design tool, the coefficient of thermal expansion (CTE) is now considered a more important design parameter in estimating pavement performance including cracking, faulting, and international roughness index (IRI). This study was conducted to measure typical CTE values of Portland cement concrete (PCC) pavements having various aggregates used in Louisiana and to investigate the relationship between CTE and other critical variables such as aggregate types, age of concrete, dimension of specimen, amount of course aggregate in mixture, relative humidity, and concrete mechanical properties. AASHTO TP 60-00 was used for measuring concrete CTE and a recently new standard test method, AASHTO T 336-09, was adopted to replace the TP 60-00.
Download or read book Determination of Coefficient of Thermal Expansion Effects on Louisiana s PCC Pavement Design 4h electronic Resource written by Hak-Chul Shin and published by . This book was released on 2011 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the development of the Mechanistic Empirical Pavement Design Guide (MEPDG) as a new pavement design tool, the coefficient of thermal expansion (CTE) is now considered a more important design parameter in estimating pavement performance including cracking, faulting, and international roughness index (IRI). This study was conducted to measure typical CTE values of Portland cement concrete (PCC) pavements having various aggregates used in Louisiana and to investigate the relationship between CTE and other critical variables such as aggregate types, age of concrete, dimension of specimen, amount of course aggregate in mixture, relative humidity, and concrete mechanical properties. AASHTO TP 60-00 was used for measuring concrete CTE and a recently new standard test method, AASHTO T 336-09, was adopted to replace the TP 60-00. A calibration factor was developed to convert the CTE values measured by AASHTO TP 60-00 to that of the new standard testing method. From the analysis of measured data, it was found that aggregate types, coarse aggregate proportion, and relative humidity have a significant influence on CTE. This finding was confirmed with a statistical analysis of variance (ANOVA). CTE tests and mechanical property tests were also performed at different ages to provide input data for Level 1 design of MEPDG. Based on the results of the MEPDG analysis, current maximum joint spacing [20 ft. (6.1 m)] in jointed plain concrete pavement (JPCP) can be adjusted to 15 or 18 ft. (4.6 or 5.5 m) when Kentucky limestone is used as a coarse aggregate.
Download or read book Thermal Conductivity and Its Effects on the Performance of PCC Pavements in MEPDG written by Upender Kodide and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Coefficient of Thermal Expansion for Portland Cement Concrete Pavements for MEPDG Implementation written by Kim Sung-Hee and published by . This book was released on 2012 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Concrete Age on Coefficient of Thermal Expansion of Paving Mixes and Its Significance in Unbonded Overlay Design written by Gauhar Sabih and published by . This book was released on 2020 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the advancement in rigid pavement design and advent of AASHTOWare Pavement Mechanistic-Empirical (ME) Design (American Association of State Highway and Transportation Officials, Washington, DC) as the latest design tool, increasing emphasis is being laid on the coefficient of thermal expansion (CTE) of concrete. The CTE affects the performance of rigid pavements in a significant manner, with a higher CTE corresponding to greater curling and resulting in greater pavement distresses. Prior research has conflicting views regarding CTE variation with age, and there has been very little to no research on the effects of CTE on the performance of unbonded concrete overlays (UBCOs). This study is performed to investigate the variation of CTE with concrete age through laboratory testing and further quantify the effects of CTE variation on UBCO design. To facilitate, four concrete paving mixes with different types of coarse aggregates and different mix properties from different districts of New Mexico were collected. The cast specimens from each of the mixes were tested for CTE as per the AASHTO T-336, Coefficient of Thermal Expansion of Hydraulic Cement Concrete , protocol, at the ages of 7, 14, 28, 60, 90, 120, and 180 days, respectively. The test results were analyzed, and it was observed that there is an increase in CTE over the range of 3.49 % to 9.77 %, between 28 days and 180 days. Further analysis was conducted with simulations in Pavement ME Design Version 2.3 ® that indicated a significantly deteriorated performance of the UBCO with increased CTE. The impact on transverse cracking and joint faulting is the most significant, with up to 13.3 % increase in cracking and up to 19.7 % increase in faulting distress. An unbonded overlay designed with 28 days CTE value may not perform for the design life because of the increase in CTE with age progression.
Download or read book Cathodic Protection Concrete and Bituminous Maintenance and Bridge Repainting written by and published by . This book was released on 1974 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Portland Cement Concrete Characteristics and Constituents on Thermal Expansion written by Md Sarwar Siddiqui and published by . This book was released on 2014 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: The coefficient of thermal expansion (CTE) is one of the major factors responsible for distresses in concrete pavements and structures. Continuously reinforced concrete pavements (CRCPs) in particular are highly susceptible to distresses caused by high CTE in concrete. CRCP is a popular choice across the U.S. and around the world for its long service life and minimal maintenance requirements. CRCP has been built in more than 35 states in the U.S., including Texas. In order to prevent CRCP distresses, the Texas Department of Transportation (TxDOT) has limited the CTE of CRCP concrete to a maximum of 5.5 x10-6 strain/oF (9.9 x10-6 strain/oC). Coarse aggregate sources that produce concrete with CTE higher than the allowable limit are no longer accepted in the TxDOT CRCP projects. Moreover, CTE is an important input in the Mechanistic-Empirical Pavement Design Guide (MEPDG). Small deviations in input CTE can affect the pavement thickness significantly in MEPDG designs. Therefore, accurate determination of concrete CTE is important, as it allows for enhanced concrete structure and pavement design as well as accurate screening of CRCP coarse aggregates. Moreover, optimizing the CTE of concrete according to a structure's needs can reduce that structure's cracking potential. This will result in significant savings in repair and rehabilitation costs and will improve the durability and longevity of concrete structures. This study found that the CTEs determined from saturated concrete samples were affected by the internal water pressure. As a result, the TxDOT method yielded higher values than did the American Association of State Highway and Transportation Officials (AASHTO) method. To further investigate the effect of internal water pressure, an analytical model was developed based on the poroelastic phenomenon of concrete. According to the model, porosity, permeability, and the rate of temperature change are the major factors that influence the internal water pressure development. Increasing the permeability of concrete can reduce the internal water pressure development and can thus improve the consistency of measured CTE values. Preconditioning concrete samples by subjecting them to several heating and cooling cycles prior to CTE testing and reducing the rate of temperature change improved the consistency of the CTE test results. Concrete CTE can be reduced by blending low-CTE aggregates with high-CTE aggregates and reducing the cement paste volume. Based on these findings, a concrete CTE optimization technique was developed that provides guidelines for the selection of concrete constituents to achieve target concrete CTE. A concrete proportioning technique was also developed to meet the need for CTE optimization. This concrete proportioning technique can use aggregate from any sources, irrespective of gradation, shape, and texture. The proposed technique has the potential to reduce the cement requirement without sacrificing performance and provides guidelines for multiple coarse and fine aggregate blends.
Download or read book Mechanistic empirical Pavement Design Guide written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 2008 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transportation Research Record written by and published by . This book was released on 1974 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guide for the Local Calibration of the Mechanistic empirical Pavement Design Guide written by and published by AASHTO. This book was released on 2010 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide provides guidance to calibrate the Mechanistic-Empirical Pavement Design Guide (MEPDG) software to local conditions, policies, and materials. It provides the highway community with a state-of-the-practice tool for the design of new and rehabilitated pavement structures, based on mechanistic-empirical (M-E) principles. The design procedure calculates pavement responses (stresses, strains, and deflections) and uses those responses to compute incremental damage over time. The procedure empirically relates the cumulative damage to observed pavement distresses.
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 Thin and Ultra thin Whitetopping written by Robert Otto Rasmussen and published by Transportation Research Board. This book was released on 2004 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 338: Thin and Ultra-Thin Whitetopping summarizes available information to document how state departments of transportation and others are currently using thin and ultra-thin whitetopping overlays among various pavement rehabilitation alternatives. The report covers all stages of the proper application of whitetopping overlays, including project selection, design, materials selection, construction, maintenance, and eventual rehabilitation or replacement.
Download or read book Pavement Design and Materials written by A. T. Papagiannakis and published by John Wiley & Sons. This book was released on 2017-02-22 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive, state-of-the-art guide to pavement design and materials With innovations ranging from the advent of SuperpaveTM, the data generated by the Long Term Pavement Performance (LTPP) project, to the recent release of the Mechanistic-Empirical pavement design guide developed under NCHRP Study 1-37A, the field of pavement engineering is experiencing significant development. Pavement Design and Materials is a practical reference for both students and practicing engineers that explores all the aspects of pavement engineering, including materials, analysis, design, evaluation, and economic analysis. Historically, numerous techniques have been applied by a multitude of jurisdictions dealing with roadway pavements. This book focuses on the best-established, currently applicable techniques available. Pavement Design and Materials offers complete coverage of: The characterization of traffic input The characterization of pavement bases/subgrades and aggregates Asphalt binder and asphalt concrete characterization Portland cement and concrete characterization Analysis of flexible and rigid pavements Pavement evaluation Environmental effects on pavements The design of flexible and rigid pavements Pavement rehabilitation Economic analysis of alternative pavement designs The coverage is accompanied by suggestions for software for implementing various analytical techniques described in these chapters. These tools are easily accessible through the book’s companion Web site, which is constantly updated to ensure that the reader finds the most up-to-date software available.
Download or read book Piping and Pipeline Calculations Manual written by Philip Ellenberger and published by Elsevier. This book was released on 2014-01-22 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: Piping and Pipeline Calculations Manual, Second Edition provides engineers and designers with a quick reference guide to calculations, codes, and standards applicable to piping systems. The book considers in one handy reference the multitude of pipes, flanges, supports, gaskets, bolts, valves, strainers, flexibles, and expansion joints that make up these often complex systems. It uses hundreds of calculations and examples based on the author's 40 years of experiences as both an engineer and instructor. Each example demonstrates how the code and standard has been correctly and incorrectly applied. Aside from advising on the intent of codes and standards, the book provides advice on compliance. Readers will come away with a clear understanding of how piping systems fail and what the code requires the designer, manufacturer, fabricator, supplier, erector, examiner, inspector, and owner to do to prevent such failures. The book enhances participants' understanding and application of the spirit of the code or standard and form a plan for compliance. The book covers American Water Works Association standards where they are applicable. - Updates to major codes and standards such as ASME B31.1 and B31.12 - New methods for calculating stress intensification factor (SIF) and seismic activities - Risk-based analysis based on API 579, and B31-G - Covers the Pipeline Safety Act and the creation of PhMSA
Download or read book Asphalt Pavements written by Y. Richard Kim and published by CRC Press. This book was released on 2014-11-06 with total page 1966 pages. Available in PDF, EPUB and Kindle. Book excerpt: Asphalt Pavements contains the proceedings of the International Conference on Asphalt Pavements (Raleigh, North Carolina, USA, 1-5 June 2014), and discusses recent advances in theory and practice in asphalt materials and pavements. The contributions cover a wide range of topics:- Environmental protection and socio-economic impacts- Additives and mo
Download or read book AASHTO Guide for Design of Pavement Structures 1993 written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 1993 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.
