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Evaluation Of High Slump Concrete For Bridge Deck Overlays
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Book Synopsis Evaluation of High-slump Concrete for Bridge Deck Overlays by : Brian Keierleber
Download or read book Evaluation of High-slump Concrete for Bridge Deck Overlays written by Brian Keierleber and published by . This book was released on 2005 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Iowa Method for bridge deck overlays has been very successful in Iowa since its adoption in the 1970's. This method involves removal of deteriorated portions of a bridge deck followed by placement of a layer of dense (Type O) Portland Cement Concrete (PCC). The challenge encountered with this type of bridge deck overlay is that the PCC must be mixed on-site, brought to the placement area and placed with specialized equipment. This adds considerably to the cost and limits contractor selection, because not all contractors have the capacity or equipment required. If it is possible for a ready-mix supplier to manufacture and deliver a dense PCC to the grade, then any competent bridge deck contractor would be able to complete the job. However, Type O concrete mixes are very stiff and generally cannot be transported and placed with ready-mix type trucks. This is where a "super-plasticizer" comes in to use. Addition of this admixture provides a substantial increase in the workability of the concrete - to the extent that it can be delivered to the site and placed on the deck directly out of a ready-mix truck. The objective of this research was to determine the feasibility of placing a deck overlay of this type on county bridges within the limits of county budgets and workforce/contractor availability.
Book Synopsis Evaluation of Concrete Overlays for Bridge Applications by : Khossrow Babaei
Download or read book Evaluation of Concrete Overlays for Bridge Applications written by Khossrow Babaei and published by . This book was released on 1987 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cracking in Concrete Bridge Decks by : Tony R. Schmitt
Download or read book Cracking in Concrete Bridge Decks written by Tony R. Schmitt and published by . This book was released on 1995 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The causes of cracking in bridge decks are investigated and procedures are recommended to alleviate the problem. Forty continuous steel girder bridges, thirty-seven composite and three noncomposite bridges are evaluated. Field surveys conducted to document cracking patterns and to determine the crack density of each bridge are described. Information collected from construction documents, field books, and weather data logs is presented and compared to the observed levels of cracking to identify correlations between cracking and the variables studied. Thirty-one variables are considered such as material properties, site conditions, construction procedures, design specifications, age of bridge and traffic volume. Based on the research reported herein, cracking in monolithic bridge decks increases with increasing values of concrete slump, percent volume of water and cement, water content, and compressive strength, and decreasing values of air content (especially below 6.0%). Bridge deck overlays placed with zero slump concrete consistently exhibit high levels of cracking. Cracking in overlays also increases as placement lengths increase. High maximum air temperatures and large changes in air temperature on the day of casting aggravate cracking in monolithic bridge decks. High average air temperatures and large changes in air temperature similarly aggravate cracking in bridge deck overlays. Both monolithic and two layer bridges with fixed-ended girders exhibit increased cracking near the abutments compared to those with pin-ended girders.
Book Synopsis Concrete Bridge Deck Performance by : H. G. Russell
Download or read book Concrete Bridge Deck Performance written by H. G. Russell and published by Transportation Research Board. This book was released on 2004 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: National Cooperative Highway Research Program.
Book Synopsis Low-slump High-density Concrete Bridge Deck Overlay by : J. E. Simonsen
Download or read book Low-slump High-density Concrete Bridge Deck Overlay written by J. E. Simonsen and published by . This book was released on 1988 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of High Performance Concrete in Four Bridge Decks, as Well as Prestressed Girders for Two Bridges by : V. Ramakrishnan
Download or read book Evaluation of High Performance Concrete in Four Bridge Decks, as Well as Prestressed Girders for Two Bridges written by V. Ramakrishnan and published by . This book was released on 2001 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis National Experimental Projects Tabulation by :
Download or read book National Experimental Projects Tabulation written by and published by . This book was released on 1985 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Dense Bridge Floor Concrete Using High Range Water Reducer (superplasticizer) by : Richard D. Smith
Download or read book Evaluation of Dense Bridge Floor Concrete Using High Range Water Reducer (superplasticizer) written by Richard D. Smith and published by . This book was released on 1983 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: To prevent bridge deck deterioration by using a high range water reducing admixture (HRWR) to obtain a dense concrete that is workable during construction to prevent chloride intrusion.
Book Synopsis Field Performance of Latex-modified and Low-slump Dense Concrete Bridge Deck Overlays in the United States by : W. P. Chamberlin
Download or read book Field Performance of Latex-modified and Low-slump Dense Concrete Bridge Deck Overlays in the United States written by W. P. Chamberlin and published by . This book was released on 1994 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technologies for Improving the Evaluation and Repair of Concrete Bridge Decks by :
Download or read book Technologies for Improving the Evaluation and Repair of Concrete Bridge Decks written by and published by . This book was released on 1998 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Two-course Bonded Concrete Bridge Deck Construction by : Samuel S. Tyson
Download or read book Two-course Bonded Concrete Bridge Deck Construction written by Samuel S. Tyson and published by . This book was released on 1975 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: A two-course bonded technique that has evolved from the continuing national and local interest in bridge deck durability was used in June 1974 to construct six bridge decks in Virginia. During the construction, which was the first phase of a five-year study on the construction, condition and performance of two-course decks, detailed observations were made of the activities used to construct the six two-course decks and two conventional single-lift decks, and data concerning the several concretes utilized in the construction of the decks were recorded. Based on comparisons of two-course and single-lift construction techniques the following conclusions are made. An overlay should be placed not sooner than two days after a base layer is placed. Light sandblasting of the base layer removes laitance that might adversely affect the bond between the base layer and overlay. A bonding layer of cement slurry should be broomed onto the base layer not further than 10 feet (3 meters) nor longer than 15 minutes ahead of the overlay placements. The same depth of clear concrete cover above the top reinforcing steel resulted from the two-course construction as from the single-lift technique. Using conventional equipment selected by the contractor, the construction activities proceeded in an orderly and satisfactory manner and coefficients of variation for the time intervals required to install the base layers and the overlays are comparable to values representing excellent control for single-lift construction. Although a 7-yd 3 (5.4 m3) truckload of concrete was screeded over 3 1/2 times as much surface area for an overlay as for a conventional single-lift deck, the average duration per truckload between the initial depositing and the completion of the screeding activity on the wearing surface was approximately the same in both the two-course and single-lift techniques. Not including texturing and curing activities, the average man-hours required to install concrete in the separate layers of the two-course decks was 33% greater than for conventional single-lift decks, but in terms of project days required for construction the two-course and single-lift techniques are equivalent. The total additional cost of the two-course technique is approximately 5% of the cost of the bridge superstructure. Three overlay concretes were selected for use as wearing courses on the two-course concrete decks on the basis of their protective qualities. A broad range of handling characteristics is represented by these concretes, which included a latex modified concrete, a high quality PCC, and a wire fiber reinforced concrete. The differences in these wearing course concretes did not significantly affect the placement activities, other than the batching, during their respective installations. In general the decks constructed by the two-course technique are equivalent to those resulting from conventional single-lift construction, however these successfully installed special wearing course concretes offer improved potential for deck performance.
Book Synopsis High Performance Concrete Bridge Deck Overlays for County Bridges by : Edward J. Engle
Download or read book High Performance Concrete Bridge Deck Overlays for County Bridges written by Edward J. Engle and published by . This book was released on 2007 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Iowa Method for bridge deck overlays has been very successful in Iowa since its adoption in the 1970s. This method involves removal of deteriorated portions of a bridge deck followed by placement of a layer of dense (Type O) Portland Cement Concrete (PCC). The challenge encountered with this type of bridge deck overlay is that the PCC must be mixed on-site, brought to the placement area and placed with specialized equipment. This adds considerably to the cost and limits contractor selection. A previous study (TR-427) showed that a dense PCC with high-range water reducers could successfully be used for bridge deck overlays using conventional equipment and methods. This current study evaluated the use of high performance PCC in place of a dense PCC for work on county bridges. High performance PCC uses fly ash and slag to replace some of the cement in the mix. This results in a workable PCC mix that cures to form a very low permeability overlay.
Book Synopsis Low Slump Portland Cement Concrete Bridge Deck Overlays by : K. H. Laaninen
Download or read book Low Slump Portland Cement Concrete Bridge Deck Overlays written by K. H. Laaninen and published by . This book was released on 1978 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Concrete Bridge Protection and Rehabilitation by : Michael M. Sprinkel
Download or read book Concrete Bridge Protection and Rehabilitation written by Michael M. Sprinkel and published by Strategic Highway Research Program (Shrp). This book was released on 1993 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the rapid methods used by state highway agencies for the protection, repair and rehabilitation of bridge decks. The report is based on a review of the literature; the responses to questionnaires sent to state departments of transportation, Canadian provinces, selected turnpike and thruway authorities, technology transfer centers, and material suppliers; and the evaluation of 50 bridge decks located in seven states. Polymer overlays, sealers, high-early strength hydraulic cement concrete overlays, and patches are compared for their performance characteristics and service life.
Book Synopsis An Evaluation of Concrete Bridge Deck Surfacing in Iowa by : Jerry V. Bergren
Download or read book An Evaluation of Concrete Bridge Deck Surfacing in Iowa written by Jerry V. Bergren and published by . This book was released on 1975 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Iowa has been using low slump concrete for repair and resurfacing of deteriorated bridge decks on a routine basis since the mid 1960's. More than 150 bridges ,have been resurfaced by this method with good results. A study was initiated in 1973 to evaluate 15 bridges resurfaced with low slump concrete, and one bridge resurfaced with latex modified concrete. The evaluation includes an assessment of concrete physical properties, chloride penetration rates, concrete consolidation, and riding qualities of the finished bridge deck. Results indicate that the overall properties of these two types of concrete are quite similar and have resulted in a contractor option concerning which system shall be used on bridge deck repair/ resurfacing projects.
Book Synopsis Field Testing of an Ultra-high Performance Concrete Overlay by : Zachary B. Haber
Download or read book Field Testing of an Ultra-high Performance Concrete Overlay written by Zachary B. Haber and published by . This book was released on 2017 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge decks are commonly rehabilitated using overlays depending on the cause of deck deterioration, available budget, and desired service life of the rehabilitated structure. One emerging solution for bridge deck rehabilitation is thin, bonded ultra-high performance concrete (UHPC) overlays. As an overlay material, UHPC can provide both structural strengthening and protection from ingress of contaminates using a 1-in (25 mm) to 2-in (51 mm) layer of material. The first U.S. deployment of UHPC as a bridge deck overlay was completed in May 2016 on a reinforced concrete slab bridge located in Brandon. A few months after installing the UHPC overlay, a field inspection of the bridge identified some locations along the deck where delamination may have occurred. To address this concern, a field study was conducted in November 2016 to evaluate the bond between the UHPC overlay and the substrate concrete bridge deck. Researchers from the Federal Highway Administration’s (FHWA) Turner-Fairbank Highway Research Center (TFHRC) synthesized photographic evidence, conducted a field inspection of the bridge deck surface using a chain drag, and conducted physical testing of the UHPC-concrete interface bond using the direct tension bond pull-off test. Tested samples were taken back to TFHRC and the UHPC-concrete interface subsequently analyzed using scanning electron microscopy (SEM). The pull-off test data indicated that the UHPC overlay and the existing concrete bridge deck was intact, which was confirmed by SEM analysis.
Book Synopsis Bridge Deck Overlays Low Slump and Latex Concrete by : Missouri. State Highway Department
Download or read book Bridge Deck Overlays Low Slump and Latex Concrete written by Missouri. State Highway Department and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
