Compilation and Evaluation of Results from High Performance Concrete Bridge Deck Projects PDF Download
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Languages : en
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Author:
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Category :
Languages : en
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Author:
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Category : Concrete bridges
Languages : en
Pages : 184
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Author:
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Category : Concrete bridges
Languages : en
Pages :
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Author: Henry G. Russell, Inc
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Category : Concrete bridges
Languages : en
Pages :
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Author: H. G. Russell
Publisher: Transportation Research Board
ISBN: 0309070112
Category : Bridges
Languages : en
Pages : 188
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At head of title: National Cooperative Highway Research Program.
Author: V. Ramakrishnan
Publisher:
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Category : Bridges
Languages : en
Pages : 272
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Author: Robert J. Frosch
Publisher: Purdue University Press
ISBN: 9781622601080
Category : Transportation
Languages : en
Pages : 178
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Transverse cracking of concrete bridge decks is problematic in numerous states. Cracking has been identified in the negative and positive moment regions of bridges and can appear shortly after opening the structure to live loads. To improve the service life of the bridge deck as well as decrease maintenance costs, changes to current construction practices in Indiana are being considered. A typical bridge deck was instrumented which incorporated the following: increased reinforcement amounts, decreasing reinforcement spacing, and high-performance, low-shrinkage concrete. The low shrinkage concrete was achieved using a ternary concrete mix. The objective of this research was to determine the performance, particularly in terms of transverse cracking and shrinkage, of a bridge incorporating design details meant to reduce cracking. Based on measurements from the bridge, it was determined that maximum tensile strains experienced in the concrete were not sufficient to initiate cracking. An on-site inspection was performed to confirm that cracking had not initiated. The data was analyzed and compared with the behavior of a similarly constructed bridge built with nearly identical reinforcing details, but with a more conventional concrete to evaluate the effect of the HPC. Based on this study, it was observed that full-depth transverse cracks did not occur in the structure and that the use of HPC lowered the magnitude of restrained shrinkage strains and resulting tensile stresses.
Author: Mateusz Radlinski
Publisher: Purdue University Press
ISBN: 9781622601097
Category : Transportation
Languages : en
Pages : 254
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The purpose of this research was to examine the applicability of ternary binder systems containing ordinary portland cement (OPC), class C fly ash (FA) and silica fume (SF) for bridge deck concrete. This was accomplished in two parts, the laboratory part and a field application part. During the laboratory studies, four ternary mixtures, each containing either 20% or 30% FA and either 5% or 7% SF were subjected to four different curing regimes (air drying, 7 days curing compound application and 3 or 7 days wet burlap curing). In general, all four ternary mixtures exhibited very good water and chloride solution transport-controlling properties (resistance to chloride-ion penetration, chloride diffusivity and rate of water absorption). However, it was concluded that in order to ensure adequate strength, good freezing and thawing resistance, satisfactory resistance to salt scaling, and adequate shrinkage cracking resistance the FA content should not exceed 20%, SF content should not exceed 5% (by total mass of binder) and paste content should be kept below 24% by volume of concrete. Further, wet burlap curing for a minimum of 3 days was required to achieve satisfactory performance and to obtain a reliable assessment of in-situ compressive strength (up to 28 days) using maturity method. The second part of this research examined the performance of ternary concrete containing 20% FA and 5% SF in the pilot HPC bridge deck constructed in northern Indiana. Using maturity method developed for the purpose of this study, it was determined that the unexpectedly high RCP values of concrete placed late in the construction season were mostly attributed to low ambient temperature. Additional applications of the developed maturity method were also demonstrated. These include assessment of risk of scaling and reduction in time to corrosion initiation as a function of construction date, as well as estimation of long-term RCP values of concrete subjected to accelerated curing.
Author: Mohsen A. Issa
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 278
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Book Description
A literature review concerning the objectives of the project was completed. A significant number of published papers, reports, etc., were examined to determine the effectiveness of full depth precast panels for bridge deck replacement. A detailed description of the experimental methodology was developed which includes design and fabrication of the panels and assembly of the bridge. The design and construction process was carried out in cooperation with the project Technical Review Panel. The major components of the bridge deck system were investigated. This includes the transverse joints and the different materials within the joint as well as composite action. The materials investigated within the joint were polymer concrete, non-shrink grout, and set-45 for the transverse joint. The transverse joints were subjected to direct shear tests, direct tension tests, and flexure tests. These tests exhibited the excellent behavior of the system in terms of strength and failure modes. Shear key tests were also conducted. The shear connection study focused on investigating the composite behavior of the system based on varying the number of shear studs within a respective pocket as well as varying the number of pockets within a respective panel. The results indicated that this shear connection is extremely efficient in rendering the system under full composite action. Finite element analysis was conducted to determine the behavior of the shear connection prior to initiation of the actual full scale tests. In addition, finite element analysis was also performed with respect to the transverse joint tests in an effort to determine the behavior of the joints prior to actual testing. The most significant phase of the project was testing a full-scale model. The bridge was assembled in accordance with the procedures developed as part of the study on full-depth precast panels and the results obtained through this research. The system proved its effectiveness in withstanding the applied loading that exceeded eight times the truck loading in addition to the maximum negative and positive moment application. Only hairline cracking was observed in the deck at the maximum applied load. Of most significance was the fact that full composite action was achieved between the precast panels and the steel supporting system, and the exceptional performance of the transverse joint between adjacent panels.
Author: Jagan Mohan Rao V. V. Kanaparthi
Publisher:
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Category :
Languages : en
Pages :
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This thesis summarizes the results of an experimental investigation on the performance evaluation of bridge deck concrete made with optimized aggregate gradation. The research conducted was part of the project sponsored by South Dakota Department of Transportation. The primary objective of the projects is to validate the research findings of the laboratory concrete against the performance of field concrete that used optimized aggregate gradation. The performance of field concrete used in three newly constructed bridge decks was evaluated by conducting a series of laboratory tests to determine compressive strength, modulus of elasticity, drying shrinkage resistance, alkali aggregate reactivity, sulfate attack, freeze-thaw durability, and rapid chloride permeability. This also includes measuring and documenting of the extent of cracks developed in the new bridge decks, and comparing with that of other similar existing bridges in the state. The study revealed that field concrete had good workability and finishability. The fresh concrete and micro-structural properties of the field concrete are similar to that of control concrete and the optimum laboratory concrete. The average compressive strength of the field concrete was higher that of control concrete and optimum laboratory concrete. The field concrete showed better resistance to sulfate attack, chloride permeability, drying shrinkage, alkali aggregate reactivity, and freeze-thaw exposure than control concrete and optimum laboratory concrete. The total number of cracks and the corresponding crack areas in the new bridge decks were significantly smaller than those of bridge decks made from A-45 concrete. It is recommended that the optimized aggregate gradation mixture proportions of Class F fly ash (20% cement replacement by weight) be specified for bridge deck concrete. Crack surveys need to be carried out on the new bridges annually for next three years to monitor any potential deterioration.
