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Evaluating The Bond Capacity Of Prestressing Strand Through Moustafa Pullout Tests
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Book Synopsis Evaluating the Bond Capacity of Prestressing Strand Through Moustafa Pullout Tests by : Christopher Bryan Harker
Download or read book Evaluating the Bond Capacity of Prestressing Strand Through Moustafa Pullout Tests written by Christopher Bryan Harker and published by . This book was released on 2003 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Determination of Acceptance Criteria for Prestressing Strand in Pre-tensioned Applications by : Thomaida Polydorou
Download or read book Determination of Acceptance Criteria for Prestressing Strand in Pre-tensioned Applications written by Thomaida Polydorou and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ASTM recently adopted the Standard Test Method for Evaluating Bond of Seven-Wire Steel Prestressing Strand as ASTM A1081, a pull-out test procedure developed for verifying the ability of steel strands to bond to cementitious materials prior to their use as tensile reinforcement in prestressed concrete sections. The required by ASTM International precision and bias statement has not been developed for this test method. In addition, a minimum threshold value that will ensure only adequately bonding strand sources will be accepted has not yet been applied to ASTM A1081. The test method was developed after findings that prestressing steel strand sources of identical type and grade vary significantly as far as their bonding capacity. Bond is a crucial aspect of the prestressing force being transferred into the concrete, and insufficient bonding action can result in the prestressed concrete section lacking in capacity to sustain the loads that it was designed for. After an initial survey of the pull-out strength of North American Strand in mortar, three strands of differing pull-out strengths were selected for inclusion in further testing. A precision and bias statement for ASTM A1081 was developed by first performing ruggedness testing to determine how the results are affected by allowable variations in methods and materials, and followed by an inter-laboratory study to determine the reproducibility of the test method. Once the precision and bias statement for the standard test method was developed, the same strand sources were tested for their performance in concrete beams. Statistical analysis of the flexural beam testing data and correlation with the prestressing strand sources' ASTM A1081 test results was performed, and the industry was provided with minimum acceptance criteria for prestressing strand tested by ASTM A1081, along with recommendations regarding the standard test method and aspects of prestressed concrete design.
Book Synopsis Transfer, Development, and Splice Length for Strand/reinforcement in High-strength Concrete by : Julio A. Ramirez
Download or read book Transfer, Development, and Splice Length for Strand/reinforcement in High-strength Concrete written by Julio A. Ramirez and published by Transportation Research Board. This book was released on 2008 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This report documents research performed to develop recommended revisions to the AASHTO LRFD Bridge Design Specifications to extend the applicability of the transfer, development, and splice length provisions for prestressed and non-prestressed concrete members to concrete strengths greater than 10 ksi. The report details the research performed and includes recommended revisions to the AASHTO LRFD Bridge Design Specifications. The material in this report will be of immediate interest to bridge designers."--Foreword.
Book Synopsis Evaluation of Test Methods in Assessing Bond Quality of Prestressing Strand by : Matthew D. Brown
Download or read book Evaluation of Test Methods in Assessing Bond Quality of Prestressing Strand written by Matthew D. Brown and published by . This book was released on 2003 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Acceptance Tests for Surface Characteristics of Steel Strands in Prestressed Concrete by : A. E. N. Osborn
Download or read book Acceptance Tests for Surface Characteristics of Steel Strands in Prestressed Concrete written by A. E. N. Osborn and published by Transportation Research Board. This book was released on 2008 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides practical tests to identify and measure residues (e.g., rust, lubricants used in manufacturing processes, or corrosion inhibitors) on the surface of steel prestressing strands and to establish thresholds for residue types found to affect the strength of the strand's bond to concrete. Key products presented here are four test methods suitable for use in a quality assurance program for the manufacture of steel prestressing strand.
Book Synopsis Recent Advances in Structural Engineering, Volume 1 by : A. Rama Mohan Rao
Download or read book Recent Advances in Structural Engineering, Volume 1 written by A. Rama Mohan Rao and published by Springer. This book was released on 2018-08-01 with total page 1137 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of select papers presented at the Tenth Structural Engineering Convention 2016 (SEC-2016). It comprises plenary, invited, and contributory papers covering numerous applications from a wide spectrum of areas related to structural engineering. It presents contributions by academics, researchers, and practicing structural engineers addressing analysis and design of concrete and steel structures, computational structural mechanics, new building materials for sustainable construction, mitigation of structures against natural hazards, structural health monitoring, wind and earthquake engineering, vibration control and smart structures, condition assessment and performance evaluation, repair, rehabilitation and retrofit of structures. Also covering advances in construction techniques/ practices, behavior of structures under blast/impact loading, fatigue and fracture, composite materials and structures, and structures for non-conventional energy (wind and solar), it will serve as a valuable resource for researchers, students and practicing engineers alike.
Book Synopsis Standard Test Method for Evaluating Bond Strength for 15.2 mm 0.6 in. Diameter Prestressing Steel Strand, Grade 270, Uncoated, Used in Prestressed Ground Anchors by :
Download or read book Standard Test Method for Evaluating Bond Strength for 15.2 mm 0.6 in. Diameter Prestressing Steel Strand, Grade 270, Uncoated, Used in Prestressed Ground Anchors written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bond, Transfer Length, and Development Length of Prestressing Strand in Self-consolidating Concrete by : Krista Beth Porterfield
Download or read book Bond, Transfer Length, and Development Length of Prestressing Strand in Self-consolidating Concrete written by Krista Beth Porterfield and published by . This book was released on 2012 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Due to its economic advantages, the use of self-consolidating concrete (SCC) has increased rapidly in recent years. However, because SCC mixes typically have decreased amounts of coarse aggregate and high amounts of admixtures, industry members have expressed concerns that the bond of prestressing strand in SCC may be compromised. While the bond performance of prestressing strand in a new material such as SCC is an important topic requiring investigation, the results are only applicable if the research is completed on strands with similar bond quality as the strands used in the field. Therefore, the objectives of this research program were to investigate the transfer and development lengths of prestressing strand in SCC and also evaluate the effectiveness of two proposed bond tests in determining acceptable bond quality of strand. Transfer and development lengths of 0.5-in. diameter (12.5 mm), Grade 270 prestressing strand were evaluated using rectangular beams constructed from normal and high strength conventional concrete and SCC mixes. End slips at release and strain readings over 28 days were used to calculate transfer lengths, and development lengths were evaluated through four-point loading at varying embedment lengths. Additionally, the NASP bond test and Large Block Pullout Tests (LBPT) were evaluated with strand from three different sources to determine if one test could be considered more reliable at predicting acceptable bond. Results indicated that bond performance of SCC and conventional concrete were comparable, and that AASHTO and ACI equations for transfer and development length were generally conservative. The NASP bond test and LBPT were found to be equally valid, but the acceptance limits for both tests appear to require revisions"--Abstract, leaf iii.
Book Synopsis Evaluating the Time-dependent Deformations and Bond Characteristics of a Self Consolidating Concrete Mix and the Implication for Pretensioned Bridge Applications by : Kyle H. Larson
Download or read book Evaluating the Time-dependent Deformations and Bond Characteristics of a Self Consolidating Concrete Mix and the Implication for Pretensioned Bridge Applications written by Kyle H. Larson and published by . This book was released on 2007 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of an extensive experimental program conducted to determine the material, bond characteristics, and time-dependent deformations of a proposed self-consolidating concrete (SCC) mixture for bridge girders are presented. This research program was completed in three phases. The first phase consisted of 15 full-scale, pretensioned SCC flexural specimens tested to evaluate their transfer and development lengths. These specimens included both single-strand and multiple-strand beams, as well as specimens designed to evaluate the so-called 'top-strand' effect. The top-strand specimens, with more than 20 inches of concrete below the strand, were tested to evaluate the current American Association of State Highway and Transportation Officials requirement of a 30% increase in the development length when the concrete below the strand is more than 12 inches. Strand end-slip measurements, used to estimate transfer lengths, indicated the proposed SCC mixture meets ACI and AASHTO requirements. In addition, flexural tests confirmed the proposed SCC mixture also meets current code requirements for development length. The second phase was to evaluate the elastic shortening, creep, and shrinkage properties of the proposed SCC mixture for bridge girders. Four bridge girders with an inverted-T profile were used to measure these time-dependent deformations. In two of the specimens, the strands were tensioned to 75% of the ultimate tensile strength, simulating a girder at service. Strands of the other two specimens were left untensioned to evaluate shrinkage effect of the concrete alone. The shrinkage was then subtracted from the fully tensioned specimens and elastic shortening and creep were isolated after relaxation losses were calculated from code expressions. In addition, the fully tensioned specimens were used to determine transfer lengths of the prestressing strand. The final phase of the program was to record strain measurements of the actual bridge girders used in the field. Elastic shortening, creep, and shrinkage prestress losses of the proposed SCC mixture were compared with current design equations. Instrumentation of seven pretensioned girders in a five-span bridge located in Cowley County, Kansas, was used to measure time-dependent deformations. Three of these girders utilized SCC, while the other four were cast with conventional concrete.
Book Synopsis Assessing the Bond Quality of Prestressing Strands Using NASP Bond Test by : Kiran Chandran
Download or read book Assessing the Bond Quality of Prestressing Strands Using NASP Bond Test written by Kiran Chandran and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Self-consolidating Concrete for Cast-in-place Bridge Components by : George Morcous
Download or read book Self-consolidating Concrete for Cast-in-place Bridge Components written by George Morcous and published by . This book was released on 2016 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: "National Cooperative Highway Research Program (NCHRP) Report 819: Self Consolidating Concrete for Cast in Place Bridge Components presents recommended guidelines for the use of self-consolidating concrete (SCC) in cast in place highway bridge components. These guidelines address the selection of constituent materials, proportioning of concrete mixtures, testing methods, fresh and hardened concrete properties, production and quality control issues, and other aspects of SCC. The report also presents proposed changes to the AASHTO LRFD Bridge Design and Construction Specifications to address use of SCC for cast in place highway bridge components. The information contained in the report will guide materials and bridge engineers in evaluating, selecting, and specifying SCC mixtures for use in cast in place concrete bridge components, thereby facilitating construction, improving the working environment and safety, and reducing cost."--Publisher's description
Book Synopsis Un-tensioned Pullout Tests to Predict the Bond Quality of Different Prestressing Reinforcements Used in Concrete Railroad Ties by : Matthew Lukas Arnold
Download or read book Un-tensioned Pullout Tests to Predict the Bond Quality of Different Prestressing Reinforcements Used in Concrete Railroad Ties written by Matthew Lukas Arnold and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental testing program was conducted at Kansas State University (KSU) to test the bond characteristics of various 5.32-mm-diameter steel wires and smaller diameter (less than 0.5 in.) strands used in prestressed concrete railroad ties. A total of 13 wires and six strands produced by seven different steel manufacturers were used during this testing. Since no wire bond pullout test currently exists, one was developed and its validity tested. This un-tensioned pullout test could serve as a quality control test similar to the standard test for strand bond (ASTM A1081) that has been developed for pretensioned strands. This strand test is currently not verified for strands less than 0.5-in. in diameter, so the procedure was also scrutinized using strands common in the concrete railroad tie industry. Some of the wires and strands contained surface indentations. It is generally accepted that indentations in the reinforcements improve the bond between the steel and concrete. To further complicate the issue, reinforcements with different surface conditions (rust, oils, lubricants) are allowed to be used in the concrete ties which further affects the bond quality of the reinforcements. However, no standardized indentation patterns (shape, size, depth of indent, etc.) or surface conditions (degree of rusting, amount of surface lubricants, etc.) are utilized by all wire and strand manufacturers. Thus, the corresponding bond behavior of these different reinforcements when placed in various concrete mixtures, in terms of average transfer lengths and typical variations, is essentially unknown. The purpose of this testing program was to develop (in the case of wires) or verify/develop (in the case of strands) a pullout testing procedure predictive of the reinforcement's bond performance in a prestressed application. The test should be relatively inexpensive, demonstrably repeatable, and easily reproducible. Results from the un-tensioned pullout tests were compared to transfer length measurements from accompanying pretensioned concrete prisms in the lab. Additionally, pullout tests and transfer length measurements were obtained at an actual concrete railroad tie manufacturing plant. The obtained data was compared to the lab data and analyzed to further understand the relationship between un-tensioned pullout tests and pretensioned concrete members.
Download or read book PCI Journal written by and published by . This book was released on 2009 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Evaluation and Field Monitoring of Self-consolidating Concrete Prestressed Box Beams Implemented in a Demonstration Bridge by : David A. Bendert
Download or read book Experimental Evaluation and Field Monitoring of Self-consolidating Concrete Prestressed Box Beams Implemented in a Demonstration Bridge written by David A. Bendert and published by . This book was released on 2007 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bond Strength of Self-consolidating Concrete for Prestressed Concrete Applications by : Amgad F. Girgis
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:
Book Synopsis Development of a Standard Test for Bond Characteristics of Prestressing Strand by : Michael Hilliard Badeaux
Download or read book Development of a Standard Test for Bond Characteristics of Prestressing Strand written by Michael Hilliard Badeaux and published by . This book was released on 1992 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Determination of Prestressing Wire Bond and Splitting Propensity Characteristics Through Tensioned Pullout Tests by : Joseph Robert Holste
Download or read book Experimental Determination of Prestressing Wire Bond and Splitting Propensity Characteristics Through Tensioned Pullout Tests written by Joseph Robert Holste and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes a testing program to evaluate the bond and splitting propensity characteristics of 5.32-mm-diameter prestressing wires. Prestressing wire reinforcement is used primarily in the production of prestressed concrete railroad ties. Twelve different 5.32-mm-diameter wires were tested in this study in order to measure bonding characteristics of the reinforcement. Establishment of the bond-slip characteristics of these reinforcement at both transfer of prestress (transfer bond) and under flexural loading (flexural bond) is necessary to enable the accurate modeling of these ties using finite elements. Transfer bond and flexure bond of various indent patterns were tested using tensioned pullouts. Specimens of various sizes with single or multiple wires were tested to determine the effects of cover and wire number on bond. Indents were machined on smooth prestressing wires to accurately compare indent geometries. Lateral expansion was tested to determine which wires have higher propensity to cause cracking or splitting. Crossties were instrumented to compare resulting lateral expansion with results found in the laboratory. The results from the testing program showed that the tensioned pullout test was able to be used to predict the transfer length of prisms made with the same reinforcement. The results also showed that the indent geometries were able to be used to predict the splitting of specimens based on the amount of slip the wire had experienced. The testing also showed the importance of concrete cover with the relation to splitting potential.
