Evaluation of Lightweight High Performance Concrete in Bulb-T Beams and Decks in Two Bridges on Route 33 in Virginia - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Evaluation of Lightweight High Performance Concrete in Bulb-T Beams and Decks in Two Bridges on Route 33 in Virginia write by Hamdi Celik Ozyildirim. This book was released on 2009. Evaluation of Lightweight High Performance Concrete in Bulb-T Beams and Decks in Two Bridges on Route 33 in Virginia available in PDF, EPUB and Kindle. Lightweight high performance concrete (LWHPC) is expected to provide high strength and high durability along with reduced weight. The purpose of this research was to evaluate and compare the prestressed LWHPC bulb-T beams and decks in two bridge structures. The bridges are on Route 33 near the confluence of the Mattaponi and Pamunkey Rivers into the York River at West Point, Virginia. Each bridge has both normal weight and lightweight bulb-T beams. The decks on the lightweight beams are also lightweight. Two distinctly different high-strength lightweight concrete mix designs and curing procedures (steam cured versus moist cured) were used for the beams of the two bridges. The results indicate that LWHPC with satisfactory strength and permeability can be achieved for beams and decks. These concretes are expected to be durable and cost-effective. The initial cost of LWHPC is higher than for conventional high performance concrete. However, the reduced dead load of LWHPC would result in longer spans, reduced number of piers or smaller piers, reduced substructure requirements, and easier transportation and erection of elements, leading to substantial savings, as was evidenced in this study. The study recommends that the use of LWHPC should continue for beams and decks and possibly for accelerated construction with precast units in substructures or superstructures, especially for rehabilitation projects. Elements cast off site would be prepared under more controlled conditions and reduced traffic interruptions. In addition, handling and delivery would be easier than for conventional concrete because of the reduced weight. If the improved quality through use of LWHPC resulted in a 10% increase in service life, large savings would occur. In Fiscal Years 2003 through 2008, the Virginia Department of Transportation spent an average of $10.68 million per year on prestressed concrete beams. Thus VDOT could save close to $1 million each year through the improvements expected with LWHPC.
Multi-Span Large Bridges
Multi-Span Large Bridges - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Multi-Span Large Bridges write by Pedro Pacheco. This book was released on 2015-06-09. Multi-Span Large Bridges available in PDF, EPUB and Kindle. Throughout the last decades, the increasing development of the urban metropolis and the need to establish fundamental infrastructure networks, promoted the development of important projects worldwide and several Multi-Span Large Bridges have been erected. Certainly, many more will be erected in the next decades. This international context undoubted
Lightweight High-Performance Concrete Bulb-T Beams With Self-Consolidating Concrete in a Bridge Structure
Lightweight High-Performance Concrete Bulb-T Beams With Self-Consolidating Concrete in a Bridge Structure - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Lightweight High-Performance Concrete Bulb-T Beams With Self-Consolidating Concrete in a Bridge Structure write by Hamdi Celik Ozyildirim. This book was released on 2014. Lightweight High-Performance Concrete Bulb-T Beams With Self-Consolidating Concrete in a Bridge Structure available in PDF, EPUB and Kindle. Lightweight high-performance concrete (LWHPC) with a pozzolan (fly ash or silica fume) or slag cement is expected to provide high strength and high durability with reduced dead load. Reduced dead load may provide savings in the substructure elements. Self-consolidating concrete (SCC) is a new technology with a very high level of workability as it easily fills formwork under the influence of its own mass, typically without any additional consolidation energy. In this study, self-consolidating LWHPC with slag cement was used in the prestressed bulb-T beams for the bridge on Route 17 over Route 15/29 in Fauquier County, Virginia. The deck has LWHPC with slag cement. The bridge has two spans, each 128 ft long. Test beams 65 ft long with the same cross section as the actual beams were cast and tested prior to the fabrication of the bridge beams. The LWHPC provided satisfactory strength and permeability in the test beams and bridge beams that were also SCC. The bridge deck concrete had satisfactory strength and durability with no cracks after two winters. The study recommends that lightweight SCCs with pozzolans or slag cement be considered in beams when there are long spans, poor soil conditions, and congested reinforcement. It is also recommended that lightweight concretes be considered for reducing deck cracking.
Bulb-T Beams with Self-consolidating Concrete on the Route 33 Bridge Over the Pamunkey River in Virginia
Bulb-T Beams with Self-consolidating Concrete on the Route 33 Bridge Over the Pamunkey River in Virginia - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Bulb-T Beams with Self-consolidating Concrete on the Route 33 Bridge Over the Pamunkey River in Virginia write by Hamdi Celik Ozyildirim. This book was released on 2008. Bulb-T Beams with Self-consolidating Concrete on the Route 33 Bridge Over the Pamunkey River in Virginia available in PDF, EPUB and Kindle. This study evaluated the bulb-T beams made with self-consolidating concrete (SCC) used in the Route 33 Bridge over the Pamunkey River at West Point, Virginia. Before the construction of the bridge, two test beams with SCC similar in cross section to the actual beams in the structure were cast and loaded to failure at the Federal Highway Administration's Turner-Fairbank Highway Research Center in McLean, Virginia. They were tested for transfer length, development length, flexural strength, and shear strength. These test beams demonstrated that SCC members can be designed using the same methods, assumptions, and limiting values as used for normally consolidated concrete beams. Based on the positive results, beams with SCC were cast and placed in the Route 33 Bridge. The study found that SCC yielding adequate slump flow can be prepared without segregation and with satisfactory strength and acceptably low permeability. However, proper attention must be devoted to mixture proportioning, workability, stability, and air content to ensure the quality of the product. The use of SCC in beams will have two major benefits: (1) expedited construction at the plant, a savings that is difficult to estimate at this time, and (2) improved quality. If the second benefit provides a 10 percent increase in service life, which is a reasonable expectation; given a typical $10.68 million yearly expenditure for prestressed concrete beams, this could lead to a cost savings for the Virginia Department of Transportation of close to $1 million per year.
Seventh International Symposium on Utilization of High Strength/ High Performance Concrete
Seventh International Symposium on Utilization of High Strength/ High Performance Concrete - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Seventh International Symposium on Utilization of High Strength/ High Performance Concrete write by H. G. Russell. This book was released on 2005. Seventh International Symposium on Utilization of High Strength/ High Performance Concrete available in PDF, EPUB and Kindle.
