Author: H. G. RussellPublisher: Transportation Research Board
ISBN: 0309070112
Category : Bridges
Languages : en
Pages : 188
Book Description
At head of title: National Cooperative Highway Research Program.
Concrete Bridge Deck Performance
Author: H. G. RussellPublisher: Transportation Research Board
ISBN: 0309070112
Category : Bridges
Languages : en
Pages : 188
Book Description
At head of title: National Cooperative Highway Research Program.
Early Age Shrinkage and Cracking of Nevada Concrete Bridge Decks
Author: Heinere Howard Ah-ShaPublisher:
ISBN:
Category : Concrete
Languages : en
Pages : 196
Book Description
Transverse Cracking in Newly Constructed Bridge Decks
Author: Paul D. KraussPublisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 136
Book Description
Concrete Manual
Author: United States. Bureau of ReclamationPublisher:
ISBN:
Category : Concrete
Languages : en
Pages : 548
Book Description
Eclipse® Shrinkage Reducing Admixture Product Evaluation
Author: Irene K. BattagliaPublisher:
ISBN:
Category : Concrete
Languages : en
Pages : 24
Book Description
Cracking in Bridge Decks
Author: Pui-shum B. ShingPublisher:
ISBN:
Category : Concrete
Languages : en
Pages : 182
Book Description
This report summarizes the findings of a study whose primary objectives are to determine the cause of extensive transverse cracking that has been observed in some existing bridge decks, and to identify the change of material specifications and construction practice that is necessary to reduce the severity of deck cracking. To achieve these goals, recent studies on the cause of bridge deck cracking were reviewed, an experimental study was conducted to compare the shrinkage properties of different concrete mixes, and the current material and design specifications and construction practice adopted by the Colorado Department of Transportation (CDOT) were reviewed to identify areas that need improvement. A survey was conducted on seven newly constructed bridges to examine the extent of cracking in concrete decks that were constructed with the different mix designs and curing procedure that were currently used by CDOT.
Silica Fume Concrete for Bridge Decks
Author: David WhitingPublisher: Transportation Research Board
ISBN: 9780309062701
Category : Technology & Engineering
Languages : en
Pages : 124
Book Description
Transverse Cracking of High Performance Concrete Bridge Decks After One Season Or Six to Eight Months
Author: Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 112
Book Description
Cracking is a major problem with newly placed concrete decks. These decks tend to develop full depth, transverse cracks and partial depth longitudinal cracks within a few months of the concrete being placed. A literature review showed that several other states had experienced similar problems. A review of data from Ohio bridge decks showed weak correlations between deck cracking and slump, time of year when the deck was placed, shrinkage, chloride permeability and compressive strength, but there was no clear relationship between cracking and any of these properties. Data also suggested that using a coarse aggregate with an absorption> 1% may help mitigate deck cracking but will not always stop it. As part of this study, 3 bridge decks were instrumented. One was a standard class "S" concrete deck and the other two were high performance concrete. The class "S" deck showed only hairline cracking after 1 year, but transverse cracking occurred in the HPC decks. Instruments were placed in the decks to monitor strains. From the data, it appears that cracking is caused by several factors. High heat of hydration caused the plastic concrete to expand. When the concrete sets and cools, tensile stressed develop. Further tensile stresses develop through drying shrinkage. Restraining the deck against normal thermal movement contributes to additional tensile stress. Autogeneous shrinkage, where high heats of hydration cause water evaporation during hydration, and plastic shrinkage may cause more tensile stress. Recommendations for mitigating cracking include using lower cement contents, adding pozzolans and retarders, using slightly higher water/cement ratios, using larger aggregates, taking steps to limit shrinkage and eliminating restraints.
Computational Methods and Experimental Measurements XV
Author: G. M. CarlomagnoPublisher: WIT Press
ISBN: 1845645405
Category : Mathematics
Languages : en
Pages : 737
Book Description
Containing edited versions of most of the papers presented at the Fifteenth International Conference on Computational Methods and Experimental Measurements, this book reviews the latest work on these two approaches, and the interaction between them.
Identification of Performance Indicators and Development of Performance Based Specifications for Bridge Decks
Author: Thomas H. WenzelPublisher:
ISBN:
Category : Bridges
Languages : en
Pages : 94
Book Description