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Download or read book Laboratory evaluation of corrosion resistance of steel dowels in concrete pavement, draft written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 256 pages
Book Rating : 4.:/5 (1 download)
Download or read book Laboratory Evaluation of Corrosion Resistance of Steel Dowels in Concrete Pavement written by and published by . This book was released on 2007 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Irene K. Battaglia
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.3/5 (555 download)
Download or read book Evaluation of MMFX 2 Steel Corrosion-resistant Dowel Bars in Jointed Plain Concrete Pavement written by Irene K. Battaglia and published by . This book was released on 2008 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Seung-Kyoung Lee
Publisher :
ISBN 13 :
Total Pages : 79 pages
Book Rating : 4.:/5 (14 download)
Download or read book Laboratory Evaluation of Corrosion Resistance of Various Metallic Dowel Bars written by Seung-Kyoung Lee and published by . This book was released on 2018 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents corrosion study findings related to corrosion resistance of eight types of metallic dowel bars. The accelerated laboratory corrosion testing was performed using seven small-scale concrete slabs that simulated typical concrete pavements for 452 d of a modified Southern Exposure followed by a detailed autopsy of the extracted bar samples. The weekly Southern Exposure cycles consisted of a 4-d wetting cycle in 15 weight percent chloride solution at 75°F and a 3-d drying cycle at 100°F. The best corrosion performance was achieved by type 316L solid stainless steel (SS) dowel bars. Three types of stainless steel–clad (SC) bars also exhibited superior corrosion resistance. The epoxy-coated (EC) dowel bars performed well and behaved similarly to the SS bar types. However, the autopsied EC dowel bars revealed varying degrees of coating delamination, and localized corrosion originated from some of the artificial coating defects. Despite this problem, EC dowel bars were able to suppress corrosion activities because of the shielding role of the coating, even disbonded EC dowel bars, against corrosion current. As expected, the worst corrosion performance was observed with the uncoated carbon steel dowel bars. Most of them produced the corrosion-induced concrete cracks. The hot-dip galvanized and zinc-clad dowel bars are classified as the second worst performance group. Even though the zinc-coating layers performed well as the sacrificial cathodic protection systems for the bare steel exposed at the artificial defect sites, the consumption rates of the zinc mass were too excessive, leading to the premature depletion of the zinc layers in the areas with elevated chloride concentration. Therefore, these zinc-based dowel bars are recommended only for infrequently salted roadways and mild service conditions. For major roadways, where repairs and/or traffic disruption are not feasible, high grades of solid SS dowel bars are recommended, even though this means very high initial costs. Considering the unavailability of the SC bars and the good performance of EC dowel bars at a much lower price, it is recommended that high-quality EC dowel bars be continuously used in the majority of the major roadways subject to heavy deicing salts provided that damage touchups and stringent quality assurance/quality control practices are implemented in the field to minimize initial coating defects until they are buried in concrete.
Author : Roger M. Larson
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (794 download)
Download or read book Evaluation of Alternative Dowel Bar Materials and Coatings written by Roger M. Larson and published by . This book was released on 2011 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The inclusion of steel dowel bars to transfer forces across sawed or formed transverse joints from one concrete pavement slab to another while permitting expansion and contraction movements of the concrete has been a basic design practice in most U.S. state departments of transportation (DOTs) for many decades. However, corrosion of the steel dowels remains a common problem, especially in states that use salt and other caustic deicing chemicals for snow and ice control. Significant corrosion reduces the effective diameter of the dowel bar in the joint, often to the point where the dowel bar will fail in shear when loaded, resulting in faulting of the pavement slab. Furthermore, the corrosion can also "lock" the dowel bar into the concrete, preventing movement of the concrete during expansion and contraction and thereby leading to the development of cracking in the adjoining slabs. In the mid-1970s, state DOTs began to require that steel dowel bars be coated with epoxy or other materials to prevent corrosion, and epoxy-coated dowels became the standard for most states. Recently, a number of different alternative dowel bar materials have emerged, seeking to combine effective load transfer capabilities with enhanced corrosion resistance. While the corrosion resistance of some alternative materials have been well documented in laboratory examinations, other performance characteristics affecting service life remain to be fully evaluated, particularly in representative field installations and over meaningful time periods.
Author : Yi Bian
Publisher :
ISBN 13 :
Total Pages : 638 pages
Book Rating : 4.:/5 (81 download)
Download or read book Investigation of Fiber Reinforced Polymer (FRP) Dowel Bars in Rigid Pavements written by Yi Bian and published by . This book was released on 2008 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Terry J. Wipf
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ISBN 13 :
Total Pages : 84 pages
Book Rating : 4.:/5 (1 download)
Download or read book Evaluation of Corrosion Resistance of Different Steel Reinforcement Types written by Terry J. Wipf and published by . This book was released on 2006 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: The corrosion of steel reinforcement in an aging highway infrastructure is a major problem currently facing the transportation engineering community. In the United States alone, maintenance and replacement costs for deficient bridges are measured in billions of dollars. The application of corrosion-resistant steel reinforcement as an alternative reinforcement to existing mild steel reinforced concrete bridge decks has potential to mitigate corrosion problems, due to the fundamental properties associated with the materials. To investigate corrosion prevention through the use of corrosion-resistant alloys, the performance of corrosion resistance of MMFX microcomposite steel reinforcement, a high-strength, high-chromium steel reinforcement, was evaluated. The study consisted of both field and laboratory components conducted at the Iowa State University Bridge Engineering Center to determine whether MMFX reinforcement provides superior corrosion resistance to epoxy-coated mild steel reinforcement in bridge decks. Because definitive field evidence of the corrosion resistance of MMFX reinforcement may require several years of monitoring, strict attention was given to investigating reinforcement under accelerated conditions in the laboratory, based on typical ASTM and Rapid Macrocell accelerated corrosion tests. After 40 weeks of laboratory testing, the ASTM ACT corrosion potentials indicate that corrosion had not initiated for either MMFX or the as-delivered epoxy-coated reinforcement. Conversely, uncoated mild steel specimens underwent corrosion within the fifth week, while epoxy-coated reinforcement specimens with induced holidays underwent corrosion between 15 and 30 weeks. Within the fifth week of testing, the Rapid Macrocell ACT produced corrosion risk potentials that indicate active corrosion for all reinforcement types tested. While the limited results from the 40 weeks of laboratory testing may not constitute a prediction of life expectancy and life-cycle cost, a procedure is presented herein to determine life expectancy and associated life-cycle costs.
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ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.:/5 (1 download)
Download or read book Demonstration and Field Evaluation of Alternative Portland Cement Concrete Pavement Reinforcement Materials written by and published by . This book was released on 2003 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transverse joints are placed in portland cement concrete pavements to control the development of random cracking due to stresses induced by moisture and thermal gradients and restrained slab movement. These joints are strengthened through the use of load transfer devices, typically dowel bars, designed to transfer load across the joint from one pavement slab to the next. Epoxy coated steel bars are the materials of choice at the present time, but have experienced some difficulties with resistance to corrosion from deicing salts. The research project investigated the use of alternative materials, dowel size and spacing to determine the benefits and limitations of each material. In this project two types of fiber composite materials, stainless steel solid dowels and epoxy coated dowels were tested for five years in side by side installation in a portion of U.S. 65 near Des Moines, Iowa, between 1997 and 2002. The work was directed at analyzing the load transfer characteristics of 8-in. vs. 12-in. spacing of the dowels and the alternative dowel materials, fiber composite (1.5- and 1.88-in. diameter) and stainless steel (1.5-in. diameter), compared to typical 1.5-in. diameter epoxy-coated steel dowels placed on 12-in. spacing. Data were collected biannually within each series of joints and variables in terms of load transfer in each lane (outer wheel path), visual distress, joint openings, and faulting in each wheel path. After five years of performance the following observations were made from the data collected. Each of the dowel materials is performing equally in terms of load transfer, joint movement and faulting. Stainless steel dowels are providing load transfer performance equal to or greater than epoxy-coated steel dowels at the end of five years. Fiber reinforced polymer (FRP) dowels of the sizes and materials tested should be spaced no greater than 8 in. apart to achieve comparable performance to epoxy coated dowels. No evidence of deterioration due to road salts was identified on any of the products tested. The relatively high cost of stainless steel solid and FRP dowels was a limitation at the time of this study conclusion. Work is continuing with the subject materials in laboratory studies to determine the proper shape, spacing, chemical composition and testing specification to make the FRP and stainless (clad or solid) dowels a viable alternative joint load transfer material for long lasting portland cement concrete pavements.
Author : R. J. Kessler
Publisher :
ISBN 13 :
Total Pages : 114 pages
Book Rating : 4.:/5 (1 download)
Download or read book Laboratory and Field Investigation of Variables Influencing Corrosion of Steel in Concrete written by R. J. Kessler and published by . This book was released on 1986 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1206 pages
Book Rating : 4.E/5 ( download)
Download or read book Government Reports Announcements written by and published by . This book was released on 1974-11 with total page 1206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.3/5 (555 download)
Download or read book High performance concrete pavements written by and published by . This book was released on 2002 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 62 pages
Book Rating : 4.X/5 (4 download)
Download or read book Standard Practice for Concrete Pavements written by and published by . This book was released on 1987 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1400 pages
Book Rating : 4.:/5 (31 download)
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1993 with total page 1400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Shawn M. Schwensen
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ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.:/5 (347 download)
Download or read book Rapid Evaluation of Corrosion-resistant Concrete Reinforcing Steel in the Presence of Deicers written by Shawn M. Schwensen and published by . This book was released on 1995 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Research Council (U.S.). Highway Research Board
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ISBN 13 :
Total Pages : 108 pages
Book Rating : 4.3/5 ( download)
Download or read book Concrete Pavement Construction and Joints and Loader-truck Production Studies written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1975 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 164 pages
Book Rating : 4.3/5 (555 download)
Download or read book Design and Evaluation of Jointed Plain Concrete Pavement with Fiber Reinforced Polymer Dowels written by and published by . This book was released on 2009 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This study evaluates fiber reinforced polymer (FRP) dowel bars as load transferring devices in jointed plain concrete pavement (JPCP) under HS25 static and fatigue loads and compares their response with JPCP consisting of steel dowels. Along with laboratory and field evaluations of JPCP with FRP and steel dowels, analytical modeling of dowel response was carried out in terms of maximum bending deflection, relative deflection (RD), and bearing stress of dowels. In addition, field rehabilitation of JPCP was carried out using FRP dowels to evaluate its long-term performance"--Technical report documentation page.
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ISBN 13 :
Total Pages : 810 pages
Book Rating : 4.3/5 (91 download)
Download or read book Transportation Research Record written by and published by . This book was released on 1987 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt:
