Author: O. Burkan IsgorPublisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 117
Book Description
Strategies to Increase the Service Life of Concrete Bridge Decks
Author: O. Burkan IsgorPublisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 117
Book Description
Durability of Concrete Bridge Decks
Author: Investigation of Methacrylate Rehabilitation Strategy to Extend the Service Life of Concrete Bridge Decks
Author: Eli CuelhoPublisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 151
Book Description
Assessment and Rehabilitation Strategies/guidelines to Maximize the Service Life of Concrete Structures
Author: Teresa M. AdamsPublisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 76
Book Description
Rethinking Bridge Deck Longevity and Maintenance with Portland Cement Polymer Concrete
Author: Andrew P. AgostoPublisher:
ISBN:
Category : Bridges
Languages : en
Pages : 134
Book Description
Bridge deck deterioration in the northern Midwest creates significant costs to state Departments of Transportation (DOT's) in the region. The fundamental cause of the problem is low tensile strength and water permeable reinforced concrete resulting in deck cracking and ultimately reinforcing bar corrosion. Portland Cement Polymer Concrete (PCPC) combined with a design approach tailored to its advantages could virtually eliminate early deck deterioration and the associated costs providing an alternative asset management path for bridge decks. Bridge decks would no longer have to be removed from their substructure every fifteen years and replaced. The results would be higher quality, longer lasting bridge decks with lower life cycle costs. This project will demonstrate the feasibility and methodology of such a strategy. This project will develop a strategy that combines innovative concrete materials, novel design and cost analysis that enhances the longevity and reduces the life cycle cost of highway bridge decks. The project is expected to show significant life-cycle cost advantages to using a high performance bridge deck material.
Bridge Deck Service Life Prediction and Costs
Author: Publisher:
ISBN:
Category : Bridges, Concrete
Languages : en
Pages : 88
Book Description
The service life of Virginia's concrete bridge decks is generally controlled by chloride-induced corrosion of the reinforcing steel as a result of the application of winter maintenance deicing salts. A chloride corrosion model accounting for the variable input parameters using Monte Carlo resampling was developed. The model was validated using condition surveys from 10 Virginia bridge decks built with bare steel. The influence of changes in the construction specifications of w/c = 0.47 and 0.45 and w/cm = 0.45 and a cover depth increase from 2 to 2.75 inches was determined. Decks built under the specification of w/cm = 0.45 (using slag or fly ash) and a 2.75 inch cover depth have a maintenance free service life of greater than 100 years, regardless of the type of reinforcing steel. Galvanized, MMFX-2, and stainless steel, in order of increasing reliability of a service life of greater than 100 years, will provide a redundant corrosion protection system. Life cycle cost analyses were conducted for polymer concrete and portland cement based overlays as maintenance activities. The most economical alternative is dependent on individual structure conditions. The study developed a model and computer software that can be used to determine the time to first repair and rehabilitation of individual bridge decks taking into account the time for corrosion initiation, time from initiation to cracking, and time for corrosion damage to propagate to a state requiring repair.
Investigation of Polyester Concrete Overlay Rehabilitation Strategy to Extend the Service Life of Concrete Bridge Decks
Author: Eli Vincent CuelhoPublisher:
ISBN:
Category : Box girder bridges
Languages : en
Pages : 41
Book Description
Nondestructive Testing to Identify Concrete Bridge Deck Deterioration
Author: Publisher: Transportation Research Board
ISBN: 0309129338
Category : Technology & Engineering
Languages : en
Pages : 96
Book Description
" TRB's second Strategic Highway Research Program (SHRP 2) Report S2-R06A-RR-1: Nondestructive Testing to Identify Concrete Bridge Deck Deterioration identifies nondestructive testing technologies for detecting and characterizing common forms of deterioration in concrete bridge decks.The report also documents the validation of promising technologies, and grades and ranks the technologies based on results of the validations.The main product of this project will be an electronic repository for practitioners, known as the NDToolbox, which will provide information regarding recommended technologies for the detection of a particular deterioration. " -- publisher's description.
Mitigation Strategies for Early-age Shrinkage Cracking in Bridge Decks
Author: Pizhong Qiao (Civil engineer)Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 0
Book Description
Early-age shrinkage cracking has been observed in many concrete bridge decks in Washington State and elsewhere around the U.S. The cracking increases the effects of freeze-thaw damage, spalling, and corrosion of steel reinforcement, thus resulting in premature deterioration and structural deficiency of the bridges. In this study, the main causes of the early-age cracking in the decks are identified, and concrete mix designs as a strategy to prevent or minimize the shrinkage cracking are evaluated. Different sources (eastern and western Washington) and sizes of aggregates are considered, and the effects of paste content, cementitious materials (cement, fly ash, silica fume, slag), and shrinkage reducing admixture (SRA) are evaluated. A series of fresh, mechanical and shrinkage property tests were performed for each concrete mix. The outcomes of this study identify optimum concrete mix designs as appropriate mitigation strategies to reduce or eliminate early-age shrinkage cracking and thus help minimize shrinkage cracking in the concrete bridge decks, potentially leading to longer service life.
Author: O. Burkan Isgor