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Author: Steve Powers Publisher: ISBN: Category : Bridges Languages : en Pages : 140
Book Description
The purpose of this project was to analyze four bridge decks in the Fairbanks area that required repairs due to corrosion and to make the necessary repairs. The Illinois Street, Minnie Street, and Wendell Street bridges were repaired during the 1982 construction season, and the Cushman Street bridge will be refurbished this summer (1983). Two repair techniques were utilized for these bridge decks. The Illinois Street and Minnie Street bridges were overlaid with latex-modified concrete. The Cushman Street bridge will also be overlaid with latex-modified concrete. The Wendell Street deck, in addition to being overlaid with latex-modified concrete, has a cathodic protection system. Both methods required the removal of all delaminated concrete. The corroded reinforcing steel rust was either cleaned or replaced. The latex-modified concrete overlay acts as a membrane that should reduce further intrusion of chloride from deicing salts and water, thereby slowing down the corrosion process. The cathodic protection system being used in conjunction with the latex-modified concrete overlay is designed to halt corrosion. The system functions by supplying direct current in the proper direction so that the corroding anodes on the steel are prevented from discharging ions, thus stopping corrosion. The merits of each technique are being evaluated with regard to cost effectiveness and ability to halt corrosion.
Author: Steve Powers Publisher: ISBN: Category : Bridges Languages : en Pages : 140
Book Description
The purpose of this project was to analyze four bridge decks in the Fairbanks area that required repairs due to corrosion and to make the necessary repairs. The Illinois Street, Minnie Street, and Wendell Street bridges were repaired during the 1982 construction season, and the Cushman Street bridge will be refurbished this summer (1983). Two repair techniques were utilized for these bridge decks. The Illinois Street and Minnie Street bridges were overlaid with latex-modified concrete. The Cushman Street bridge will also be overlaid with latex-modified concrete. The Wendell Street deck, in addition to being overlaid with latex-modified concrete, has a cathodic protection system. Both methods required the removal of all delaminated concrete. The corroded reinforcing steel rust was either cleaned or replaced. The latex-modified concrete overlay acts as a membrane that should reduce further intrusion of chloride from deicing salts and water, thereby slowing down the corrosion process. The cathodic protection system being used in conjunction with the latex-modified concrete overlay is designed to halt corrosion. The system functions by supplying direct current in the proper direction so that the corroding anodes on the steel are prevented from discharging ions, thus stopping corrosion. The merits of each technique are being evaluated with regard to cost effectiveness and ability to halt corrosion.
Author: Qindan Huang Publisher: ISBN: Category : Bridges Languages : en Pages :
Book Description
As there are a large number of existing aging bridges in need of maintenance, Ohio Department of Transportation is seeking safer, better, and efficient approaches for patch-repair concrete removal on bridge decks. The current practice to remove concrete is by using pneumatic breakers, which presents a danger to operators and damages to the sound concrete and rebar. Building on an extensive literature review, this study evaluates the current method and alternative methods that can address the limitations of the current method. Based on the findings, the recommendation is to use hydrodemolition robot to remove concrete, as it is time-efficient and does not create potential harm to the bridge deck or operator. In addition, hydrodemolition leaves a coarse finish cut to allow for a more effective and long lasting bond with the repair material, which is important for patch repair. Two potential robots are identified as most suitable for bridge deck concrete removal: Conjet Jetframe 101 Nalta and Conjet Robot 327. While the advantages of Conjet Jetframe 101 Nalta are easy transportability and low capital cost, Conjet Robot 327 has a higher productivity rate and has a built in debris barrier that is safer for the crew and on-going traffic. Lastly, based on the cost analysis, for project size larger than 100 SF, Conjet Robot 327 becomes a better option.
Author: National Research Council (U.S.). Transportation Research Board Publisher: Transportation Research Board National Research ISBN: Category : Technology & Engineering Languages : en Pages : 80
Book Description
"This synthesis will be of special interest and usefulness to bridge engineers and others seeking information on design, construction, and maintenance of bridge decks. Detailed information is presented on the causes, prevention, evaluation, and rehabilitation of deck deterioration related to corrosion of steel reinforcement."--Avant-propos.
Author: G. P. Mallett Publisher: Thomas Telford ISBN: 9780727720078 Category : Technology & Engineering Languages : en Pages : 216
Book Description
Provides a review of the repair, maintenance and protection of concrete bridges. This book summarizes information from conference papers, research and technical reports, and others. It aims to increase the expertise of structural engineers and safeguard the investment. It presents solutions to the problems and pitfalls that engineers encounter.
Author: Steve Powers
Author: Steve Powers
Author: Qindan Huang
Author: Lowell B. Steere
Author: Herbert N. Swanson
Author: Robert J. Frosch
Author: David B. Woodham
Author: National Research Council (U.S.). Transportation Research Board
Author: Maher K. Tadros
Author: 
Author: G. P. Mallett