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High Performance Continuously Reinforced Concrete Pavements In Richmond And Lynchburg Virginia
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Book Synopsis High-performance Continuously Reinforced Concrete Pavements in Richmond and Lynchburg, Virginia by : Hamdi Celik Ozyildirim
Download or read book High-performance Continuously Reinforced Concrete Pavements in Richmond and Lynchburg, Virginia written by Hamdi Celik Ozyildirim and published by . This book was released on 2007 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluated the properties of two high performance concrete (HPC) paving projects in Virginia. These continuously reinforced concrete pavements were placed on State Route 288 near Richmond and on the U.S. 29 Madison Heights Bypass in Lynchburg; a minimum flexural strength of 650 psi at 28 days was required for each. In an attempt to control cracking, reduced shrinkage was sought through the use of large maximum size well-graded aggregates and proper curing. The results showed that satisfactory strengths can be obtained at 28 days. Concretes with the lowest water content had the lowest shrinkage, as expected. For desired performance, good construction practices including a level base, correct steel placement, proper consolidation, timely texturing, and effective curing are required. Although pavement designs are based on flexural strength, compressive strength tests are more convenient and less variable than are flexural strength tests. Therefore, a correlation was established between flexural and compressive strength, and acceptance of the pavements was based on compressive strength. The findings of the study led to the following recommendations with regard to the concrete used in HPC paving projects: Consider specifying strength at ages above 28 days to encourage the use of a higher percentage of pozzolanic material; specify the use of large maximum size aggregate in combination with well-graded aggregate to reduce water content and minimize segregation; use trial batches to determine the minimum cementitious materials content that provides acceptable strength and workability; use actual elastic modulus values to check and adjust the design of the pavement; use a test section before the start of the paving operation to determine if any changes to the equipment and placement procedures are needed; use compressive strength for the acceptance of a project after a correlation with flexural strength is established; permit maturity testing to estimate the strength of concrete in the pavement for opening to traffic based on concrete curing time and temperature. If as little as a 10 percent increase in service life were achieved by using HPC, the savings would be in the millions of dollars over the life of the pavement. With proper selection of the aggregates, a reduction in the cementitious material content of 50 lb/yd3 is possible and would translate to a savings of about $400,000 dollars for the two projects investigated in this study. The reduction in time for opening to traffic of new or reconstructed pavements through strength estimation by the maturity method and the use of appropriate earlier strength mixtures can lead to road user cost savings close to $0.5 million per year.
Book Synopsis Evaluation of High Performance Concrete Pavements in Newport News and Hampton, Virginia by : Hamdi Celik Ozyildirim
Download or read book Evaluation of High Performance Concrete Pavements in Newport News and Hampton, Virginia written by Hamdi Celik Ozyildirim and published by . This book was released on 2004 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluated the properties of three high performance concrete mixtures placed in a jointed plain concrete paving project on I-64 in Newport News, Virginia, to reduce the shrinkage and improve the flexural strength of the concrete. Two mixtures contained ground-granulated blast furnace slag with 2-inch and 1-inch nominal maximum size (NMS) aggregate, and the third mixture contained Class F fly ash with 1-inch NMS aggregate. Air-entrained paving concretes with satisfactory strength, low permeability, and dimensional stability were prepared using concretes with Class F fly ash or slag and 1-inch or 2-inch NMS aggregates. Slipform pavers satisfactorily placed these concretes. The test sections were in excellent condition after six winters based on a visual survey. Falling weight deflectometer data indicated a better load transfer with the larger aggregate size with everything else being equal. The study also evaluated the maturity method in the continuation of the project on I-64 in Hampton, Virginia. After the evaluation, the pavement was changed to continuously reinforced concrete and the concrete properties were tested in accordance with the recently introduced Guide for Mechanistic-Empirical Design of New and Rehabilitated Pavement Structures (known as the proposed AASHTO M-E Design Guide). In the Hampton portion, a Class F fly ash mixture with the 1-inch NMS aggregate was used. The use of large aggregate, provided the particle shape is acceptable, and uniform combined grading should be specified for concretes with reduced water and cement contents. The maturity method can be used to determine the pavement's readiness for opening to traffic and should be included in the specifications.
Book Synopsis Experience with Continuously Reinforced Concrete Pavements in Virginia by : Kenneth H. McGhee
Download or read book Experience with Continuously Reinforced Concrete Pavements in Virginia written by Kenneth H. McGhee and published by . This book was released on 1974 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Continuously Reinforced Hydraulic Cement Concrete Pavement at Virginia's Smart Road by : Hamdi Celik Ozyildirim
Download or read book Evaluation of Continuously Reinforced Hydraulic Cement Concrete Pavement at Virginia's Smart Road written by Hamdi Celik Ozyildirim and published by . This book was released on 2004 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A two-lane continuously reinforced concrete pavement was built in Blacksburg, Virginia, as a part of Virginia's Smart Road. One of the lanes is 12 ft wide, and the other is 14 ft wide. The additional 2 ft was part of the shoulder. Below the concrete pavement is a 3-in-thick open-graded drainage layer (OGDL); one section is asphalt stabilized, and the other section is cement stabilized. The concrete pavement was cured by a curing compound except that the 12-ft lane was also covered with plastic and straw because of concerns with cold ambient temperature. The objective of this project was to determine the material properties of the concrete, instrument the pavement, monitor construction practices, and monitor the performance of the pavement over 4 years. The concrete had high early strength, low permeability, and high shrinkage. The average crack spacing was more than 3 ft, indicating satisfactory performance. In general, cracks were wider when they were further apart, but the differences in crack spacing and width were variable and small in some cases and could not be correlated after 4 years. The end sections had less cracking than the interior sections of the pavement. There were fewer cracks and more space between cracks in the 12-ft lane and fewer cracks in the pavement over the asphalt-stabilized OGDL. This was attributed to a better cure in the 12-ft lane and to a lower friction over the asphalt-stabilized base. No changes to the specifications were recommended as a result of the study findings.
Book Synopsis Evaluation of Jointed Reinforced Concrete Pavement Rehabilitation on I-64 in the Richmond and Hampton Roads Districts of Virginia by : Brian K. Diefenderfer
Download or read book Evaluation of Jointed Reinforced Concrete Pavement Rehabilitation on I-64 in the Richmond and Hampton Roads Districts of Virginia written by Brian K. Diefenderfer and published by . This book was released on 2009 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beginning in 2004, the Virginia Department of Transportation (VDOT) undertook a series of pavement rehabilitation projects to address deficiencies in three sections of the I-64 corridor between Richmond and Newport News. I-64 serves as the primary avenue between the Richmond and Hampton Roads metropolitan areas and carries a combined traffic volume ranging from approximately 20,000 to 90,000 vehicles per day. For nearly 100 mi, this roadway is a four-lane divided facility that was originally built between the late 1960s and early 1970s as either a jointed reinforced or continuously reinforced concrete pavement. The existing concrete pavement was rehabilitated using three rehabilitation procedures: two standard approaches and an experimental approach. The standard rehabilitation procedures included the use of full-depth portland cement concrete (PCC) patches overlaid by a hot-mix asphalt (HMA) overlay and full-depth PCC patches followed by grinding of the pavement surface. The experimental rehabilitation procedure consisted of the use of full- and partial-depth HMA patches followed by an HMA overlay. The purpose of this study was to document the initial condition and performance to date of the I-64 project and to summarize similar work performed by state departments of transportation other than VDOT. The pavement rehabilitation cost per lane-mile was nearly 20% less for the section of I-64 for which full-depth PCC patches followed by grinding of the pavement surface was used than for the other two sections. However, the experimental results do not allow for a comparison to determine any differences in the structural capacity or service life between the sections. The study recommends that VDOT's Materials Division annually monitor the ride quality of the pavement in the three rehabilitated sections of I-64 so that the end of service life can be defined as the pavement roughness increases because of deterioration. Further, the Virginia Transportation Research Council should collaborate with other research organizations to encourage and pursue full-scale or laboratory-scale accelerated pavement testing to determine the optimum repair materials and methods for pre-overlay repair of existing PCC pavements and to develop models to quantify the deterioration of an asphalt overlay placed over an existing concrete pavement because of reflection cracking.
Book Synopsis High performance concrete pavements by :
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:
Book Synopsis Performance Studies of Continuously Reinforced Concrete Pavement by : Kenneth H. McGhee
Download or read book Performance Studies of Continuously Reinforced Concrete Pavement written by Kenneth H. McGhee and published by . This book was released on 1972 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The status of studies of the three continuously reinforced pavement projects near Charlottesville is reported. Of particular interest in these studies are the effects of the elimination of transverse reinforcing steel, the changing characteristics of shrinkage cracking with age, and the end movements of anchor sections. While the studies are somewhat inconclusive at this early age of the pavements, the following tentative conclusions are offered: 1. Cracks show a definite trend to become both more closely spaced and wider during the first 2 to 3 years of a continuously reinforced pavement's life. There is some inconclusive evidence that the widening process stabilizes after this time period. 2. While crack spacing can be influenced by weather conditions during pavement placement, there is no apparent relationship between crack width and either crack spacing or placement weather. 3. As expected, cracks are significantly wider at the surface during winter (pavement shrinking) than during summer (pavement expanding). (Note - Earlier studies have shown that cracks which are easily seen and measured at the surface are invisible in the immediate vicinity of the reinforcing steel.) 4. End anchor movement is very modest during the first year and seems to decrease slightly with age. There is a pronounced seasonal effect which produces joint movements in excess of the capabilities of poured joint sealants. 5. The elimination of full width transverse steel has had no effect on pavement performance for the first 2 to 3 years. Acting upon a recommendation from these studies, the Department's pavement design engineer has instituted a requirement for the use of preformed compression seals in all expansion joints adjacent to the anchor slabs of continuously reinforced pavements.
Book Synopsis Continuously Reinforced Concrete Pavement by : National Research Council (U.S.). Highway Research Board
Download or read book Continuously Reinforced Concrete Pavement written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1973 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This report should be of special interest to design, materials, fundation, and construction engineers responsible for continuously reinforced concrete pavements."--Avant-propos.
Book Synopsis Continuously Reinforced Concrete Pavements by : J. M. Gregory
Download or read book Continuously Reinforced Concrete Pavements written by J. M. Gregory and published by . This book was released on 1974 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance of Continuously Reinforced Concrete Pavements by : Dan G. Zollinger
Download or read book Performance of Continuously Reinforced Concrete Pavements written by Dan G. Zollinger and published by . This book was released on 1999 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis End Anchors for Continuously Reinforced Concrete Pavements by : R. A. Mitchell
Download or read book End Anchors for Continuously Reinforced Concrete Pavements written by R. A. Mitchell and published by . This book was released on 1960 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Of Continuously Reinforced Concrete Pavements, Vol. VI-CRC Pavement ..., FHWA-RD-97-151 ... U.S. Department Of Trans ... 02/99 by :
Download or read book Performance Of Continuously Reinforced Concrete Pavements, Vol. VI-CRC Pavement ..., FHWA-RD-97-151 ... U.S. Department Of Trans ... 02/99 written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Investigation of Continuously Reinforced Concrete Pavements by : Howard Newlon
Download or read book An Investigation of Continuously Reinforced Concrete Pavements written by Howard Newlon and published by . This book was released on 1957 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance of Continuously Reinforced Concrete Pavement in Texas by : Harvey J. Treybig
Download or read book Performance of Continuously Reinforced Concrete Pavement in Texas written by Harvey J. Treybig and published by . This book was released on 1968 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Performance of Continuously Reinforced Concrete Pavements by : Eldon Joseph Yoder
Download or read book Design and Performance of Continuously Reinforced Concrete Pavements written by Eldon Joseph Yoder and published by . This book was released on 1973 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance of Continuously Reinforced Concrete Pavements by :
Download or read book Performance of Continuously Reinforced Concrete Pavements written by and published by . This book was released on 1999 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance of Continuously Reinforced Concrete Pavement in Texas by : Thomas Scullion
Download or read book Performance of Continuously Reinforced Concrete Pavement in Texas written by Thomas Scullion and published by . This book was released on 1987 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
