Factors Affecting Bond In Multi Strand Post Tensioning Tendons Including The Effect Of Emulsifiable Oils
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Factors Affecting Bond In Multi Strand Post Tensioning Tendons Including The Effect Of Emulsifiable Oils
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Author : Jeffrey Roger Diephuis
language : en
Publisher:
Release Date : 2004
Factors Affecting Bond In Multi Strand Post Tensioning Tendons Including The Effect Of Emulsifiable Oils written by Jeffrey Roger Diephuis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Recent corrosion problems worldwide have brought increased attention to the issues of durability and corrosion resistance of post-tensioned tendons. While the overall experience in the United States has been good, there is a desire to implement further measures to ensure the adequate protection of post-tensioning systems. This thesis is part of a broad research program evaluating both temporary and long-term corrosion protection solutions. In particular, this thesis addresses the effect of emulsifiable oils used for temporary corrosion protection on bond in multi-strand post-tensioning tendons. The effect of duct type on bond behavior is also investigated. Overall findings indicate that while the force developed by oiled strands is satisfactory, the reduced adhesion between the steel and the grout results in excessive slip. Additionally, galvanized steel pipes tended to allow the grout to slip relative to the duct or the duct to slip relative to the concrete at significantly reduced loads. Corrugated ducts eliminated this slip. Of the corrugated ducts, galvanized metal ducts provided somewhat better bond performance than high density polyethylene ducts.
Factors Affecting Bond And Friction Losses In Multi Strand Post Tensioning Tendons Including The Effect Of Emulsifiable Oils
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Author :
language : en
Publisher:
Release Date : 2005
Factors Affecting Bond And Friction Losses In Multi Strand Post Tensioning Tendons Including The Effect Of Emulsifiable Oils written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Emulsions categories.
Factors Affecting Friction Losses In Multi Strand Post Tensioning Tendons Including The Effect Of Emulsifiable Oils
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Author : Juan José Icaza Aguirre
language : en
Publisher:
Release Date : 2004
Factors Affecting Friction Losses In Multi Strand Post Tensioning Tendons Including The Effect Of Emulsifiable Oils written by Juan José Icaza Aguirre and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Tendons (Prestressed concrete) categories.
Emulsifiable oils are sometimes used in post-tensioned construction to provide temporary corrosion protection to the tendons in the period between stressing and grouting. It has been common practice to flush tendons with water to remove the oil, and then use compressed air to remove the water from the ducts. Often environmental concerns make disposal of the flushed oils difficult and costly. In addition, significant voids, pockets of water, and corroded strands have been found. It is believed that flushing with water and compressed air does not completely remove either the oil or the water, and such a practice is now strongly discouraged. Leaving the oil will certainly affect the bond strength of the tendon and that can be a negative effect. However, previous research has shown that emulsifiable oils reduce the friction losses and this can be a positive effect. The objective of this research is to quantify the effects of lubrication with emulsifiable oils on the friction losses of multi-strand tendons. In addition, the effects of curvature, duct material, and the time between lubrication and stressing were investigated. Damage to the inside of the duct caused by stressing of the tendon was also studied. Large-scale friction tests were performed using multi-strand tendons in three different conditions: dry (unlubricated), freshly oiled, and one day after oiling. These tests were performed with three different duct materials: steel pipe, corrugated galvanized steel duct, and high density polyethylene (HDPE) duct. The tests were repeated using two different radii of curvature. Results from these tests indicated that the coefficient of friction was independent of the radius of curvature. However, different coefficients of friction were found for each duct material. The coefficient of friction found for steel pipes and galvanized steel ducts agree with those recommended in the literature. This was not the case for HPDE ducts. In this case the coefficient found was substantially lower than that recommended. Lubrication of the tendons reduced the coefficient of friction. However, this reduction was sometimes eliminated if a one day delay occurred between oiling and stressing. No significant damage was observed in either HDPE ducts or galvanized steel ducts.
Advances And Trends In Engineering Sciences And Technologies Ii
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Author : Mohamad Al Ali
language : en
Publisher: CRC Press
Release Date : 2016-11-30
Advances And Trends In Engineering Sciences And Technologies Ii written by Mohamad Al Ali and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-11-30 with Technology & Engineering categories.
These are the proceedings of the 2nd International Conference on Engineering Sciences and Technologies (ESaT 2016), held from 29th of June until the 1st of July 2016 in the scenic High Tatras Mountains, Tatranské Matliare, Slovak Republic. After the successful implementation and excellent feedback of the first international conference ESaT 2015, ESaT 2016 was organized under the auspices of the Faculty of Civil Engineering, Technical University of Košice, Slovak Republic in collaboration with the University of Miskolc, Hungary. The conference focused on a wide spectrum of topics and subject areas in civil engineering sciences. The proceedings bringing new and original advances and trends in various fields of engineering sciences and technologies that accost a wide range of academics, scientists, researchers and professionals from universities and practice. The authors of the articles originate from different countries around the world guaranteeing the importance, topicality, quality and level of presented results.
Durability Evaluation Of Post Tensioned Concrete Beam Specimens After Long Term Aggressive Exposure Testing
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Author :
language : en
Publisher:
Release Date : 2007
Durability Evaluation Of Post Tensioned Concrete Beam Specimens After Long Term Aggressive Exposure Testing written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Accelerated life testing categories.
Strand Development And Splice Device
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Author : Michelle Deanna Rambo-Roddenberry
language : en
Publisher:
Release Date : 2009
Strand Development And Splice Device written by Michelle Deanna Rambo-Roddenberry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Tendons (Prestressed concrete) categories.
"A new device for gripping prestressing strands was developed and tested. The device could provide a means of anchoring the terminal end of a strand in order to provide a mechanism for developing bonded strand at the service limit state, to provide this mechanism at the strength limit state, and to develop unbounded strand at the strength limit state. It could also be used to mechanically splice strands together. Grouting this device into a member may reduce the development length of the strand, thereby increasing the effectiveness of the strand for reducing tensile stresses and cracking"--Technical report documentation p.
Aci Structural Journal
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Author :
language : en
Publisher:
Release Date : 2008
Aci Structural Journal written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Concrete categories.
Verbundverhalten Von Litzenspanngliedern Mit Nachtr Glichem Verbund
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Author : Robert Ullner
language : de
Publisher: vdf Hochschulverlag AG
Release Date : 2008
Verbundverhalten Von Litzenspanngliedern Mit Nachtr Glichem Verbund written by Robert Ullner and has been published by vdf Hochschulverlag AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Chemical bonds categories.
Chemical Admixtures For Concrete
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Author : Sandra Senft
language : en
Publisher: CRC Press
Release Date : 1999-06-24
Chemical Admixtures For Concrete written by Sandra Senft and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-06-24 with Architecture categories.
Chemical admixtures are used in concrete mixtures to produce particular engineering properties such as rapid hardening, water-proofing or resistance to cold. Chemical Admixtures for Concrete surveys recent developments in admixture technology, explaining the mechanisms by which admixtures produce their effects, the various types of admixtures avail
Handbook Of Wood Chemistry And Wood Composites
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Author : Roger M. Rowell
language : en
Publisher: CRC Press
Release Date : 2005-02-18
Handbook Of Wood Chemistry And Wood Composites written by Roger M. Rowell and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-02-18 with Science categories.
The degradable nature of high-performance, wood-based materials is an attractive advantage when considering environmental factors such as sustainability, recycling, and energy/resource conservation. The Handbook of Wood Chemistry and Wood Composites provides an excellent guide to the latest concepts and technologies in wood chemistry and bio-based composites. The book analyzes the chemical composition and physical properties of wood cellulose and its response to natural processes of degradation. It describes safe and effective chemical modifications to strengthen wood against biological, chemical, and mechanical degradation without using toxic, leachable, or corrosive chemicals. Expert researchers provide insightful analyses of the types of chemical modifications applied to polymer cell walls in wood, emphasizing the mechanisms of reaction involved and resulting changes in performance properties. These include modifications that increase water repellency, fire retardancy, and resistance to ultraviolet light, heat, moisture, mold, and other biological organisms. The text also explores modifications that increase mechanical strength, such as lumen fill, monomer polymer penetration, and plasticization. The Handbook of Wood Chemistry and Wood Composites concludes with the latest applications, such as adhesives, geotextiles, and sorbents, and future trends in the use of wood-based composites in terms of sustainable agriculture, biodegradability and recycling, and economics. Incorporating over 30 years of teaching experience, the esteemed editor of this handbook is well-attuned to educational demands as well as industry standards and research trends.