Environmental influence on the bond between a polymer concrete overlay and an aluminum substrate PDF Download

Author:
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ISBN:
Category :
Languages : en
Pages : 29

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Author: David W. Mokarem
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 29

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Book Description
Chloride-ion-induced corrosion of reinforcing steel in concrete bridge decks has become a major problem in the United States. Latex-modified concrete, low-slump dense concrete, and hot-mix asphalt membrane overlays are some of the most used rehabilitation methods. Epoxy-coated reinforcing steel was developed and promoted as a long-term corrosion protection method by the Federal Highway Administration. However, recent evidence has suggested that epoxy-coated reinforcing steel will not provide adequate long-term corrosion protection. The Reynolds Metals Company developed an aluminum bridge deck system as a proposed alternative to conventional reinforced steel bridge deck systems. The deck consists of a polymer concrete overlay and an aluminum substrate. The purpose of this investigation was to evaluate the bond durability between the overlay and the aluminum substrate after specimens were conditioned in various temperature and humidity conditions. The different environmental conditionings all had a significant effect on the bond durability. Specimens conditioned at 30°C, 45 °C, and 60°C at 98 percent relative humidity all showed a decrease in interfacial bond strength after conditioning. There was also a decrease in the interfacial bond strength for the specimens conditioned in freezing and thawing cycles and specimens conditioned in a salt water soak. The only exposure condition that increased the bond strength was drying the specimens continuously in an oven at 60°C.

Author:
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Category : State government publications
Languages : en
Pages : 216

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Author: Stella Marusin
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 216

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Author: Andrew Joseph Shearrer
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 200

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Book Description
Epoxy polymer overlays have been used for decades on existing bridge decks to protect the deck and extend its service life. The polymer overlay's ability to seal a bridge deck is now being specified for new construction. Questions exist about the amount of drying time needed to achieve an acceptable concrete moisture content to ensure an adequate bond to the polymer overlay. The 2007 Kansas Department of Transportation (KDOT) specifications for new bridge decks call for a 14-day wet curing period followed by 21 days of drying. If not enough drying is provided, the moisture within the concrete can form water vapor pressure at the overlay interface and induce delamination. If too much drying time is provided, projects are delayed, which can increase the total project cost or even delay overlay placement until the next spring. A testing procedure was developed to simulate a bridge deck in order to test the concrete moisture content and bonding strength of the overlay. Concrete slabs were cast to test typical concrete and curing conditions for a new bridge deck. Three concrete mixtures were tested to see what effect the water-cement ratio and the addition of fly ash might have on the overlay bond strength. Wet curing occurred at three different temperatures (40 degrees F, 73 degrees F, and 100 degrees F) to see if temperature played a part in the bond strength as well. The concrete was then allowed to dry for 3, 7, 14, or 21 days. Five epoxy-polymer overlay systems that had been preapproved by KDOT were each used in conjunction with the previously mentioned concrete and curing conditions. After this, the slabs were setup to perform pull-off tests to test the tensile rupture strength. The concrete slabs with the different epoxy overlays were heated to 122-125 degrees F to replicate summer bridge deck temperatures. Half of the pull-off tests were performed when the slabs were heated and half were performed once the slabs had cooled back down to 73 degrees F plus or minus 5 degrees F. Results from the pull-off tests as well as results from a moisture meter taken on the concrete prior to the overlay placement were compared and analyzed. Testing conditions were compared with each other to see which had a larger effect on the epoxy polymer overlay's bond strength. The results showed that concrete bridge deck polymer overlays could be placed sooner than 21 days after concrete placement and still have an adequate bond.

Author: Volkan Cicek
Publisher: John Wiley & Sons
ISBN: 1119284457
Category : Technology & Engineering
Languages : en
Pages : 770

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The Corrosion Engineering and Cathodic Protection Handbook combines the author's previous three works, Corrosion Chemistry, Cathodic Protection, and Corrosion Engineering to offer, in one place, the most comprehensive and thorough work available to the engineer or student. The author has also added a tremendous and exhaustive list of questions and answers based on the text, which can be used in university courses or industry courses, something that has never been offered before in this format. The Corrosion Engineering and Cathodic Protection Handbook is a must-have reference book for the engineer in the field, covering the process of corrosion from a scientific and engineering aspect, along with the prevention of corrosion in industrial applications. It is also a valuable textbook, with the addition of the questions and answers section creating a unique book that is nothing short of groundbreaking. Useful in solving day-to-day problems for the engineer, and serving as a valuable learning tool for the student, this is sure to be an instant contemporary classic and belongs in any engineer's library.

Author:
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Category : Metallurgy
Languages : en
Pages : 1306

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Author: American Concrete Institute
Publisher:
ISBN: 9780870319334
Category :
Languages : en
Pages : 71

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Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 806

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Author: American Concrete Institute
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 1294

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