Design and Concrete Material Requirements for Ultra-thin Whitetopping PDF Download

Author: Jeff Roesler
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 44

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Author: Robert Otto Rasmussen
Publisher: Transportation Research Board
ISBN: 0309070198
Category : Pavements
Languages : en
Pages : 96

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Book Description
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.

Author: Haifang Wen
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 136

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Author: Nenad Gucunski
Publisher:
ISBN:
Category : Fiber-reinforced concrete
Languages : en
Pages : 78

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Book Description
Concrete overlay of deteriorated asphalt pavements (whitetopping) has been a viable alternative to improve the pavement's structural integrity for over six decades. The thickness of such overlay usually exceeds five inches. In the last few years, however, a newer technology has emerged which is commonly known as Ultra Thin Whitetopping (UTW). UTW is a construction technique, which involves placement of a thinner (than normal) thickness ranging from 2 to 4 inches. he intent of this research study is to identify and address important factors that contribute to the performance of the UTW pavement system. It is also the goal of this research to present an interim design procedure fine tuned by further observation of UTW systems.

Author: Nicoleta Ileana Dumitru
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 46

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Book Description
A suburban city street in Kansas was rehabilitated with a 50 mm (2 in.) Portland Cement Concrete (PCC) thin overlay, commonly known as ultra-thin whitetopping (UTW). The construction and performance of this UTW project have been described in this report. The project, constructed in the Spring of 1995, incorporated the following design features: 0.9 m x 0.9 m (3 ft x 3 ft) panels versus 1.2 m x 1.2 m (4 ft x 4 ft) panels, plain versus fiber reinforced concrete, and sealed versus unsealed joints. The project has performed fairly well to date although some test sections needed periodic maintenance and all of the test sections except two have been overlaid as of October 2001. Experience on this project shows that the UTW overlay can be easily built with conventional equipment and locally available materials. UTW also permits a skid-resistant finish to be applied. Excellent smoothness can also be obtained although the slab thickness is very small. Corner cracking appears to be the most dominant distress type, though it was observed that bond existed between the concrete and the asphalt layers even for the cracked panels. The bond appeared to degrade with time. Joint spacing has a significant effect on performance. The sections with smaller joint spacing appeared to perform better. The performance of the sections with fibers in concrete was inconclusive. Also, joint sealing did not appear to affect the performance.

Author: Erol Tutumluer
Publisher: CRC Press
ISBN: 0203865286
Category : Technology & Engineering
Languages : en
Pages : 1560

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Book Description
Bearing Capacity of Roads, Railways and Airfields focuses on issues pertaining to the bearing capacity of highway and airfield pavements and railroad track structures and provided a forum to promote efficient design, construction and maintenance of the transportation infrastructure. The collection of papers from the Eighth International Conference

Author: A. T. Papagiannakis
Publisher: John Wiley & Sons
ISBN: 1394150180
Category : Technology & Engineering
Languages : en
Pages : 660

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Book Description
Practical guide for all aspects of pavement engineering, updated with the latest techniques, standards, and software The newly revised and updated Second Edition of Pavement Design and Materials offers a comprehensive treatment of pavement materials, structural analysis, design, evaluation, and economic analysis of asphalt and portland concrete pavements. Written by two highly qualified engineering professors with a wealth of experience in the field, Pavement Design and Materials provides readers with: State-of-the-art techniques for material characterization, including a linear viscoelasticity primer Methods and software for the analysis of flexible and ridgid pavements including the AASHTOWare Pavement ME Design State-of-the-art pavement evaluation techniques including moduli backcalculation methods Pavement economic analysis techniques including the most up-to-date user cost relationships. The book companion website provides: Solved examples in each chapter and the electronic files associated with them An instructor solutions manual for the problems provided at the end of each chapter PowerPoint presentations by chapter to facilitate lecture delivery Pavement Design and Materials is an essential up-to-date textbook on the subject for upper-level undergraduate and graduate level courses on pavement materials and pavement design. It is also a valuable reference for practicing professional engineers involved in the various aspects of roadway pavement material selection and structural design.

Author: Kurt D. Smith
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 200

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Book Description
This report presents the latest information on the design, construction and performance of portland cement concrete (PCC) overlays. It describes the four types of PCC overlays that are commonly used in highway pavement applications: bonded PCC overlays, unbonded PCC overlays, conventional whitetopping and ultra-thin whitetopping. Recommended applications, critical design elements, current overlay design methodologies, recommended construction practices, and performance highlights are described for each overlay type. Information is also provided on the selection of PCC overlays as possible rehabilitation alternatives for existing pavements. Taken together, this document addresses the current "state of the technology" of PCC overlays placed on both existing PCC pavements and on existing hot-mix asphalt pavements.

Author: Billy D. Neeley
Publisher:
ISBN:
Category : Fiber-reinforced concrete
Languages : en
Pages : 256

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Book Description
This report documents the results from an investigation of a new polymer fiber and unique delivery system for charging fibers into concrete mixtures. The straight Polyolefin fibers are available in two sizes: (1) 0.63 mm in diameter and 50 mm long, and (2) 0.38 mm in diameter and 25 mm long. Each of the two sizes of fibers is packaged in bundles approximately 50 mm in diameter. Each. bundle is encased with paper tape bound with a water-soluble glue. The fibers are charged into the concrete mixture in mass. Approximately 3 to 10 min of mixing time is necessary to uniformly distribute the fibers throughout the concrete mixture, depending upon the fiber content, consistency of the concrete mixture, and the type of mixer being used. Fresh and hardened properties were evaluated in mixtures containing up to 15 kg/cu m. The results indicate that concrete mixtures with the Polyolefin fibers can be produced having adequate workability and finishability if proportioned properly. Addition of the Polyolefin fibers does not significantly influence the compressive nor first-crack flexural strength, freezing-and-thawing resistance, drying shrinkage, nor the chloride permeability of concrete mixtures. However, the presence of the Polyolefin fibers does influence the post-crack behavior of concrete mixtures. Impact resistance and flexural toughness are improved as the fiber loading increases. A 6,100-m whitetopping demonstration project was constructed on a heavily traveled interstate in Mississippi. The whitetopping was 100 mm thick. Details of the specifications, construction, and early-time performance are given.

Author: F. Pacheco-Torgal
Publisher: Woodhead Publishing
ISBN: 1782424016
Category : Technology & Engineering
Languages : en
Pages : 552

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Book Description
Climate change is one of the most important environmental problems faced by Planet Earth. The majority of CO2 emissions come from burning fossil fuels for energy production and improvements in energy efficiency shows the greatest potential for any single strategy to abate global greenhouse gas (GHG) emissions from the energy sector. Energy related emissions account for almost 80% of the EU's total greenhouse gas emissions. The building sector is the largest energy user responsible for about 40% of the EU’s total final energy consumption. In Europe the number of installed air conditioning systems has increased 500% over the last 20 years, but in that same period energy cooling needs have increased more than 20 times. The increase in energy cooling needs relates to the current higher living and working standards. In urban environments with low outdoor air quality (the general case) this means that in summer-time one cannot count on natural ventilation to reduce cooling needs. Do not forget the synergistic effect between heat waves and air pollution which means that outdoor air quality is worse in the summer aggravating cooling needs. Over the next few years this phenomenon will become much worse because more people will live in cities, more than 2 billion by 2050 and global warming will aggravate cooling needs. An overview of materials to lessen the impact of urban heat islands Excellent coverage of building materials to reduce air condtioning needs Innovative products discussed such as Thermo and Electrochromic materials