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Book Structural Performance of Prestressed Self consolidating Concrete Bridge Girders Made with Limestone Aggregates

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.

Book Structural Evaluation of Prestressed Self consolidating Concrete Bridge Girders Using Limestone Aggregates

Download or read book Structural Evaluation of Prestressed Self consolidating Concrete Bridge Girders Using Limestone Aggregates written by Chad Joseph Stripling and published by . This book was released on 2008 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Self compacting Concrete SCC for Prestressed Bridge Girders

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.

Book Self Compacting Concrete Materials Properties and Applications

Download or read book Self Compacting Concrete Materials Properties and Applications written by Rafat Siddique and published by Woodhead Publishing. This book was released on 2019-11-19 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Self-Compacting Concrete: Materials, Properties and Applications presents the latest research on various aspects of self-compacting concrete, including test methods, rheology, strength and durability properties, SCC properties at elevated temperature, SC manufacturing with the use of SCMs, recycled aggregates and industrial by-products. Written by an international group of contributors who are closely associated with the development of self-compacting concrete, the book explores the main differences between SCC and normal concrete in terms of raw materials, fresh properties and hardened properties. Other topics discussed include the structure and practical applications of fiber reinforced SCC. Researchers and experienced engineers will find this reference to be a systematic source to SCC with its accounting of the latest breakthroughs in the field and discussions of SCC constructability, structural integrity, improved flows into complex forms, and superior strength and durability. Offers a systematic and comprehensive source of information on the latest developments in SCC technology Includes mix design procedures, tests standards, rheology, strength and durability properties Explores the properties and practical applications of SCC

Book Investigating the Bond of Prestressing Strands in Lightweight Self consolidating Concrete

Download or read book Investigating the Bond of Prestressing Strands in Lightweight Self consolidating Concrete written by Royce Woodrow Floyd and published by . This book was released on 2012 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lightweight self-consolidating concrete (LWSCC) is a relatively recent advancement in concrete technology. The reduced dead load from lightweight concrete is beneficial for precast elements and for elements where dead load is a significant portion of the total load, such as prestressed bridge girders. Self-consolidating concrete (SCC) is a specially proportioned concrete mixture that consolidates under its own weight without the need for vibration. The combination of lightweight concrete and self-consolidating behavior provides the benefits of both. Bond of prestressing steel has been a much debated topic since the 1950s. Limited data are available on the transfer and development length of strands cast in SCC and even less for strands cast in LWSCC. The differences in material properties resulting from the lightweight coarse aggregate and mix proportioning used for LWSCC have potential to lead to longer transfer and development lengths than those for conventional concrete, which can be detrimental to shear and flexural performance. The transfer and development length equations provided in the ACI Building Code Requirements for Structural Concrete and AASHTO Bridge Design specifications are based on studies performed using conventional concrete. This research project examined the transfer and development length of LWSCC specimens using 0.6 in. (15.2 mm) Grade 270 prestressing strand. Four specimens were cast from each mixture consisting of a combination of expanded clay, expanded shale, or limestone aggregate and a compressive strength of 4000 psi or 6000 psi (28 MPa or 41 MPa) at prestress release. Results were compared between the mixtures, to the code equations, and to previous research. The bond performance of LWSCC with a release strength of 6000 psi (41 MPa) was very similar to normal weight SCC, the transfer lengths for both strength levels were accurately predicted by the code equations, and the measured development lengths were significantly less than those predicted.

Book Shear Behavior of High Strength Self consolidating Concrete in Nebraska University Bridge Girders

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.

Book Self consolidating Concrete for Prestressed Bridge Girders

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:

Book Implementation of Self Consolidating Concrete SCC for Prestressed Concrete Girders

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.

Book Performance of American Association of State Highway and Transportation Officials Type III Girders Made with Self consolidating Concrete

Download or read book Performance of American Association of State Highway and Transportation Officials Type III Girders Made with Self consolidating Concrete written by Alexander Samuel Colmorgan and published by . This book was released on 2008 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book M D RN P RSP CTIV S N PR CTIC S IN L CTRCI L NGIN RING

Download or read book M D RN P RSP CTIV S N PR CTIC S IN L CTRCI L NGIN RING written by ibrahim elnoshokaty and published by ibrahim elnoshokaty. This book was released on with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: thrее full-ѕсаlе рrеѕtrеѕѕеd gіrdеrѕ wеrе fаbrісаtеd аnd tеѕtеd tо еvаluаtе trаnѕfеr lеngth, рrеѕtrеѕѕ lоѕѕеѕ, саmbеr, flеxurаl bеhаvіоr аnd ѕtrеngth, flеxurаl rіgіdіty, аnd ѕhеаr ѕtrеngth. Twо оf thе gіrdеrѕ wеrе саѕt wіth ЅСС аnd оnе wаѕ саѕt wіth соnvеntіоnаl соnсrеtе tо ѕеrvе аѕ а соntrоl ѕресіmеn. Еасh gіrdеr wаѕ fіttеd wіth а соmроѕіtе ѕlаb tо mоdеl а brіdgе dесk. Dеѕіgn оf thе gіrdеrѕ іnсludеd іnѕtrumеntаtіоn сараblе оf mеаѕurіng іnѕtаntаnеоuѕ аnd tіmе-dереndеnt ѕtruсturаl rеѕроnѕеѕ. Thе соntrоl gіrdеr аnd оnе оf thе ЅСС gіrdеrѕ wеrе tеѕtеd іn flеxurе undеr mоnоtоnіс іnсrеаѕіng lоаd tеѕtіng untіl fаіlurе. Thе rеmаіnіng ЅСС gіrdеr wаѕ lоаdеd tо fаіlurе by іnсrеmеntаlly іnсrеаѕіng сyсlіс lоаd tеѕtіng. Durіng lоаd tеѕtіng, ѕtrаіn dаtа wаѕ соllесtеd tо mоnіtоr rеѕроnѕе іn bоth flеxurе аnd ѕhеаr. Dаtа wаѕ аnаlyzеd аnd uѕеd tо еvаluаtе thе реrfоrmаnсе оf ЅСС іn рrеѕtrеѕѕеd brіdgе gіrdеrѕ. Thіѕ rеѕеаrсh іnсludеd а lіtеrаturе rеvіеw, dеѕіgn аnd іnѕtrumеntаtіоn оf fullѕсаlе tеѕt ѕресіmеnѕ, fаbrісаtіоn оf tеѕt ѕресіmеnѕ, lоаd tеѕtіng еасh gіrdеr tо fаіlurе, аnd аn еvаluаtіоn оf thе ѕtruсturаl реrfоrmаnсе оf ЅСС іn соmраrіѕоn tо thаt оf соnvеntіоnаl соnсrеtе fоr uѕе іn рrеѕtrеѕѕеd brіdgе gіrdеrѕ. Trаnѕfеr lеngth, рrеѕtrеѕѕ lоѕѕеѕ, саmbеr, flеxurаl ѕtrеngth, flеxurаl rіgіdіty, аnd ѕhеаr ѕtrеngth wеrе dеtеrmіnеd uѕіng соdе рrоvіѕіоnѕ аnd аnаlytісаl mеthоdѕ fоr соnvеntіоnаl рrеѕtrеѕѕеd соnсrеtе gіrdеrѕ. Thе gіrdеrѕ саѕt wіth ЅСС реrfоrmеd аt lеаѕt аѕ wеll аѕ thаt саѕt wіth соnvеntіоnаl соnсrеtе wіth rеgаrdѕ tо trаnѕfеr lеngth, flеxurаl сарасіty, аnd ѕhеаr сарасіty. Сyсlіс tеѕtіng ѕhоwеd thаt thе рrе-сrасkіng еffесtіvе ѕtіffnеѕѕ rеduсеѕ ѕlіghtly wіth аn іnсrеаѕе іn аррlіеd lоаd. Thе rеѕultѕ іndісаtе thаt ЅСС саn bе uѕеd fоr рrоduсtіоn оf рrеѕtrеѕѕеd соnсrеtе brіdgе gіrdеrѕ fоllоwіng thе ѕаmе dеѕіgn рrоvіѕіоnѕ uѕеd fоr thе dеѕіgn оf соnvеntіоnаl соnсrеtе рrеѕtrеѕѕеd gіrdеrѕ.

Book Prestress Losses in Prestressed Bridge Girders Cast with Self consolidating Concrete MBTC 2071

Download or read book Prestress Losses in Prestressed Bridge Girders Cast with Self consolidating Concrete MBTC 2071 written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract. ... This research program examined the prestress losses of beams cast with SCC and compares those to losses of control beams cast with conventional concrete of the same compressive strength. Additionally, the research program examined the transfer and development length of SCC beams.