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Author:
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ISBN:
Category : Concrete bridges
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages :
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Author: R. P. Webster
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 87
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Book Description
The development of a built up, electrically conductive polymer concrete overlay and a premixed, electrically conductive polymer concrete mortar for use on bridge decks and other concrete members, in conjunction with cathodic protection systems, is reported. The research program was divided into two phases. The emphasis of the work performed in phase one was directed towards the evaluation of the 18 commercially available resin systems and the 16 conductive filler systems selected for consideration. Basic studies were also performed to evaluate various parameters affecting the electrical resistivity properties of both the built up overlay and premixed mortar systems. In phase two, extensive evaluation of the physical and mechanical properties of the most promising overlay and premixed mortar systems were performed. In addition, the performance characteristics of the selected overlay systems, when incorporated into active cathodic protection systems, were evaluated.
Author:
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ISBN:
Category : Concrete bridges
Languages : en
Pages : 72
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Book Description
This report describes the development of a premixed electrically conductive polymer concrete overlay for use on bridge decks and other concrete members, in conjunction with cathodic protection systems. A field demonstration was performed on a bridge deck (with corroding reinforcing steel) in Pulaski, Virginia, where an active cathodic protection system uses the electrically conductive overlay as the secondary anode to uniformly distribute the current across the bridge deck surface. The performance of the overlay cathodic protection system was monitored for 18 months. The data show that corrosion of the reinforcing steel embedded in the bridge deck was arrested. The overlay is soundly bonded, and there are no indications that the overlay is wearing due to traffic. This report is the conclusion of the research study. Details of the mix design and the installation of the conductive polymer concrete overlay are described in the Interim Report, FHWA-RD-88-145, dated January 1989.
Author: J. J. Fontana
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 13
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Author: Michael M. Sprinkel
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 62
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The results of a study undertaken to evaluate premixed polymer concrete overlays (PMPCO) over a 3-year period are presented. The PMPCO evaluated were constructed with polyester amide para resin and silica sand 1;. polyester styrene resin 1 and silica sand 2; polyester styrene resin 2, basalt aggregate and coke breeze (for conductivity); polyester styrene resin 2, silica sand 3 and coke breeze; and vinyl ester styrene resin, silica sand 2, and coke breeze. The mixing of the ingredients was done with either portable concrete mixers, mortar mixers, or a continuous batching mobile concrete mixer. The overlays were struck off and consolidated with a vibrating screed or a slip form paver. The report indicates that a nonconductive PMPCO with high bond strength, low permeability, and high skid resistance can be successfully installed by a contractor and opened to traffic after only three hours of curing. The report indicates that a conductive PMPCO with high bond strength and skid resistance can be successfully installed as a secondary anode for a cathodic protection system. Also, it is shown that the special provision for a PMPCO should require the installation of test patches or test sections of overlay prior to placing the final overlay to assure that the surface preparation is adequate and the mixing, installation equipment, procedures, and materials will provide a satisfactory overlay.
Author: Oregon. State Highway Division
Publisher:
ISBN:
Category : Polymer-impregnated concrete
Languages : en
Pages : 30
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Book Description
This report describes work done on various combinations of monomers and polymer concrete mixes and identifies the mixes showing the greatest potential for use in bridge deck overlays. Presented are test results showing physical properties of various polymer concrete mixes, such as compressive strength, split tensile strength, modulus of elasticity, thermal coefficient of expansion, and shrinkage coefficient. The effects of polymer content, work time, and temperature on various properties are also discussed. The development of two polymer concrete systems with excellent membrane potential are described along with the details of bonding characteristics of several systems. Finally, a polymer concrete mix with suitable properties for deck and pavement patching is detailed.
Author: David W. Fowler
Publisher: Transportation Research Board
ISBN: 0309143543
Category : Technology & Engineering
Languages : en
Pages : 75
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Book Description
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 423: Long-Term Performance of Polymer Concrete for Bridge Decks addresses a number of topics related to thin polymer overlays (TPOs). Those topics include previous research, specifications, and procedures on TPOs; performance of TPOs based on field applications; the primary factors that influence TPO performance; current construction guidelines for TPOs related to surface preparation, mixing and placement, consolidation, finishing, and curing; repair procedures; factors that influence the performance of overlays, including life-cycle cost, benefits and costs, bridge deck condition, service life extension, and performance; and successes and failures of TPOs, including reasons for both.
Author:
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ISBN:
Category :
Languages : en
Pages : 704
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages :
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Author: Stella Marusin
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 216
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