Download or read book Implementation of Self consolidating Concrete for Prestressed Concrete Girders written by Paul Zia and published by . This book was released on 2005 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Implementation of Self Consolidating Concrete SCC for Prestressed Concrete Girders written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Self-Consolidating Concrete (SCC) was first developed in Japan almost 15 years ago, and it was not until the late 1990's that the U.S precast concrete industry applied the technology to architectural and structural building elements. This study describes the first experience of using SCC for prestressed concrete bridge girders in North Carolina. A multiple-span bridge is currently under construction in eastern North Carolina using one hundred thirty AASHTO Type III girders, each 54.8 ft (16.7 m) long (NCDOT Project 8.1170903). Three girders from one production line of five girders were selected for evaluation. Two of the girders were cast with SCC and one with conventional concrete as the control. The plastic and hardened properties of both the SCC and the conventional concrete were monitored and measured. The fresh properties of SCC included unit weight, air content, slump flow, Visual Stability Index (VSI), and passing ability as measured by J-ring and L-box. Hardened concrete tests on SCC and conventional concrete included compressive strength, static elastic modulus, elastic modulus based on resonance frequency ('dynamic' modulus) at different ages, along with creep and shrinkage. The prestressing force in the girders was monitored by load cells. Finally, the three girders were tested in flexure up to the design service load to determine and compare their load-deformation characteristics. In general, two AASTHO Type III girders were successfully cast without any vibration using SCC, and exhibited virtually identical load-deflection relationships up to the design service load than that of the conventional concrete girder. SCC showed lower elastic modulus after strength adjustment, and higher creep and shrinkage than conventional concrete.

Download or read book Implementation of Self consolidating Concrete SCC for Prestressed Concrete Girders written by Luis Alexander Mata and published by . This book was released on 2004 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: bridge beam, girder, creep, flexural modulus, modulus of elasticity, prestressing, self-consolidating concrete, shrinkage, strength.

Download or read book Implementing Fiber reinforced Self consolidating Concrete as a Repair Material for AASHTO Prestressed Concrete Girders written by Jacob G. Choate and published by . This book was released on 2018 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Self consolidating Concrete for Precast Prestressed Concrete Bridge Elements written by Kamal Khayat and published by Transportation Research Board. This book was released on 2009 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: National Cooperative Highway Research Program.

Download or read book Transfer and Development Length of Prestressing Tendons in Full scale AASHTO Prestressed Concrete Girders Using Self consolidating Concrete written by Bassem O. Andrawes and published by . This book was released on 2009 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shear Behavior of High Strength Self consolidating Concrete in Nebraska University Bridge Girders written by Alexander Michael Griffin and published by . This book was released on 2014 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: "As the nation's infrastructure continues to age, advanced concrete technologies have been developed to both reduce a structure's costs and increase its life expectancy. Since the early 1990's, self-consolidating concrete (SCC) has been one of these technologies. Many, however, have been reluctant to implement SCC in highway girders due to the mixture constituents. One of these concerns is the reduced content and size of the coarse aggregate. These differences in the concrete potentially hinder SCC's mechanical properties and shear resistance. Additionally, for high strength concretes (HSC) with weaker aggregates, shear cracks tend to propagate through the coarse aggregate, reducing the aggregate interlock component of the shear resistance. This study aimed at assessing the web-shear strength both with and without web reinforcement of two precast-prestressed Nebraska University (NU) 53 girders fabricated with high strength self-consolidating concrete (HS-SCC). The results were compared to the ACI 318 (2011) and AASHTO LRFD (2012) code estimates, and a finite element model (FEM) package, Response 2000. ATENA Engineering, a finite element analysis (FEA) program, was also used to evaluate the qualitative results, specifically crack patterns and the effect of the coarse aggregate content and size. A prestressed concrete database was also constructed to assess the effect of the reduced coarse aggregate content on the shear capacity of HS-SCC in prestressed concrete members. The mechanical properties of the HS-SCC mix were also tested and compared to relevant empirical equations. The HS-SCC mix investigated in this study proves to be a viable cost-saving alternative for bridge superstructure elements"--Abstract, page iii.

Download or read book Self consolidating Concrete for Prestressed Bridge Girders written by Junwon Seo and published by . This book was released on 2017 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Self compacting Concrete SCC for Prestressed Bridge Girders written by Bulent Erkmen and published by . This book was released on 2008 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers conducted an experimental program to investigate the viability of producing self-consolidating concrete (SCC) using locally available aggregate, and the viability of its use in the production of precast prestressed concrete bridge girders for the State of Minnesota. Six precast prestressed bridge girders were cast using four SCC and two conventional concrete mixes. Variations in the mixes included cementitious materials (ASTM Type I and III cement and Class C fly ash), natural gravel and crushed stone as coarse aggregate, and several admixtures. The girders were instrumented to monitor transfer length, camber, and prestress losses. In addition, companion cylinders were cast to measure the compressive strength and modulus of elasticity, and to monitor the creep and shrinkage over time. The viability of using several test methods to evaluate SCC fresh properties was also investigated. The test results indicated that the overall performance of the SCC girders was comparable to that of the conventional concrete girders. The measured, predicted, and calculated prestress losses were generally in good agreement. The study indicated that creep and shrinkage material models developed based on companion cylinder creep and shrinkage data can be used to reasonably predict measured prestress losses of both conventional and SCC prestressed bridge girders.

Download or read book Transfer and Development Lengths of Steel Strands in Full Scale Prestressed Self Consolidating Concrete Bridge Girders written by Andrew M. Pozolo and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Self-consolidating concrete (SCC) is a workable yet stable concrete which flows easily and consolidates under its own weight. Its unique properties can substantially reduce the labor required to pour complex or heavily reinforced structural members. Over the past decade, the American precast industry has taken significant strides to adopt SCC in commercial projects, though concern about early-age bond behavior has limited the material0́9s application in prestressed members. A keen understanding of SCC0́9s bond strength, including its impact on transfer and development lengths in prestressed members, is essential to safely implement SCC in prestressed design. The Illinois Department of Transportation (IDOT) has sponsored a three-phase study exploring the bond behavior of steel strands in prestressed bridge girders. In the first phase, 56 pullout tests were conducted to compare the performance of seven-wire strands embedded in SCC and conventionally-consolidated concrete blocks. In the second phase, transfer lengths of prestressing strands in two SCC hollow box girders and two SCC I-girders were determined experimentally. In the third phase, the development length of strands in the two box girders was determined through a series of iterative flexural tests. This thesis details the three phases of the IDOT study and compares results to industry standards and requirements of the American Concrete Institute and the American Association of State Highway and Transportation Officials. Results are also compared to analytical methods proposed in the literature. Additionally, a systematic method is developed to predict transfer lengths in full-scale specimens using pullout test data and finite element analysis. The proposed method may be useful when large-scale testing is impractical in terms of time or cost.

Download or read book A Compilation of Research on Self consolidating Concrete for Prestressed Bridge Girders written by Eduardo S. Torres and published by . This book was released on 2016 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization and Benefits of Self consolidating Concrete for Use in Prestressed Bridge Girders written by Robert Boggs Howard and published by . This book was released on 2007 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bond Strength of Self consolidating Concrete for Prestressed Concrete Applications written by Amgad F. Girgis and published by . This book was released on 2004 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of the Performance and Benefits of Lightweight Self consolidating Concrete Prestressed Concrete Bridge Girders and Self consolidating Concrete Materials written by and published by . This book was released on 2009 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Self-Consolidating Concrete (SCC), also known as self-compacting concrete, is a highly flowable concrete that is capable of filling formwork without using conventional vibration techniques while maintaining its cohesiveness. Currently SCC is used in many commercial applications and is gaining acceptance from many state DOTs for use in precast prestressed bridge girders. SCC is advantageous for many reasons including: (i) the number of workers required and the noise produced by mechanical vibration is reduced significantly; (ii) the safety hazards of workers on top of the girders is eliminated; (iii) the surface finish of the concrete can be more smooth than that of conventional concrete; (iv) formwork damage from mechanical vibration is reduced, increasing the life of the forms; (v) reinforcing bar configurations are not damaged; (vi) improved bond of concrete to prestressed strands could reduce strand end slip and the top bar effect; and (vii) SCC is able to fill complicated shapes and congested reinforcement areas better than vibrated concrete. This research report addresses the design and resulting properties of normal weight mix designs that were developed at the University of South Carolina and the testing of full scale lightweight concrete AASHTO Type III girders. Both aspects address material testing for properties in the fresh and hardened states. Fresh properties include slump spread, filling ability, passing ability, and air content. Hardened properties include compressive strength, modulus of elasticity, creep, shrinkage, chloride permeability, and freeze thaw durability. Testing of the girders includes transfer length, end slip, midspan deflections, midspan strains, and internal curing temperatures. Summaries and conclusions are provided along with recommended guidelines for implementation.

Download or read book Characterization of Self consolidating Concrete for Design of Precast Prestressed Bridge Girders written by David Trejo and published by . This book was released on 2008 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structural Performance of Prestressed Self consolidating Concrete Bridge Girders Made with Limestone Aggregates written by and published by . This book was released on 2009 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent studies have shown that the use of self-consolidating concrete (SCC) results in improved finished quality, increased production efficiency, and reduced labor cost. Because of the favorable properties that SCC exhibits, the Federal Highway Administration and the precast concrete industry have been promoting the research and development of SCC for structural applications in bridges. In 2007, researchers at South Dakota State University (SDSU) concluded an experimental study on three full-scale prestressed bridge girders. One of the three girders was cast using conventional concrete and served as a control specimen, while the other two girders were cast using SCC. The SCC mix was made with quartzite coarse aggregate that is commonly used in eastern South Dakota. The results of the study show that the structural performance of the prestressed SCC girders is similar to that of the control prestressed girder. It was also observed that the SCC girders have a better finished surface than the conventional concrete girder. The study in this report involves material testing of SCC mixtures and structural testing of full-scale prestressed bridge girders.

Download or read book Study of Transfer and Development Length of Prestressing Tendons in Prestressed Concrete Girders Using Self consolidating Concrete written by Moochul Shin and published by . This book was released on 2008 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: