Download or read book Electrical Resistivity of Concrete written by William Elkey and published by . This book was released on 1995 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Resistivity of Concrete written by Shu-Leung Norman Lee and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Resistivity of Concrete" by Shu-leung, Norman, Lee, 李樹樑, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Cement, a main composition of concrete, is the major contributor to the greenhouse effect. During the production of cement, a significant amount of carbon dioxide is released to the environment. As the world is moving towards a more sustainable environment, the durability of concrete becomes a concern. The durability of concrete can be improved with proper quality control and resistivity measurement is one of the methods used to indicate the quality of concrete. Because of the importance of resistivity, the present study is to achieve a better understanding of the electrical resistivity of concrete. The effect of various concrete mixtures to concrete resistivity is examined in this study. For the evaluation, surface resistivity is measured on 150mm concrete cubes. The concrete mixtures involves different combination of paste volume, W/C ratio, curing condition and supplementary cementitious materials / fillers. The supplementary cementitious materials are pulverised fuel ash (PFA), condensed silica fume (CSF) and the filler is limestone fines (LF). While PFA and CSF are used as cement replacement, the LF is used for the substitution of cement paste. The results have indicated that the electrical resistivity is affected by the paste volume, W/C ratio, curing condition and the combination of PFA, CSF and LF. Concrete resistivity increases as a result of a decrease in paste volume. A strong correlation exists between the W/C ratio and the surface resistivity. The R DEGREES2 = 0.9211 and 1 for 30% and 34% paste volume respectively. Also, the curing condition affect the moisture content of the concrete. The surface resistivity is higher for a drier surface. With the addition of PFA, CSF and LF, the surface resistivity increases significantly. The present study also examines the correlation between surface resistivity and different concrete properties such as compressive strength, moisture content, water penetration and rapid chloride penetration. The results shows that there is a strong correlation between surface resistivity and compressive strength for plain mixtures with R DEGREES2 = 1. However, this correlation decrease with the addition of other cementitious materials. As a result, the correlation would be better for a separated resistivity curve for different cementitious materials. The surface resistivity and the water penetration only has a moderate correlation. For plain mixtures, the correlation value is R DEGREES2 = 0.6814. R DEGREES2 = 0.7069 is the correlation value for concrete mixtures with PFA and CSF. Finally, there is a strong relationship between rapid chloride penetration and the surface resistivity. The surface resistivity is inversely proportional to the rapid chloride penetration with a correlation of R DEGREES2 = 0.9472. Subjects: Concrete - Electric
Download or read book A Method of Measuring Earth Resistivity written by Frank Wenner and published by . This book was released on 1916 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Collaboration and Integration in Construction Engineering Management and Technology written by Syed M. Ahmed and published by Springer Nature. This book was released on 2020-12-21 with total page 651 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers papers presented at the 11th International Conference on Construction in the 21st Century, held in London in 2019. Bringing together a diverse group of government agencies, academics, professionals, and students, the book addresses issues related to construction safety, innovative technologies, lean and sustainable construction, international construction, improving quality and productivity, and innovative materials in the construction industry. In addition, it highlights international collaborations between various disciplines in the areas of construction, engineering, management, and technology. The book demonstrates that, as the industry moves forward in an ever-complex global economy, multi-national collaboration is crucial, and its future growth will undoubtedly depend on international teamwork and alliances.
Download or read book Smart Cement written by Cumaraswamy Vipulanandan and published by CRC Press. This book was released on 2021-07-29 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over three billion metric tons of cement are produced annually worldwide, making concrete the most extensively used construction material. Self-sensing, or smart, cement allows real-time monitoring of performance through the entire service life of a concrete structure, for the detection of changing stresses, contamination, excessive temperature, gas leaks and pre-seismic activity. This is achieved by adding a very small proportion of conductive or semi-conductive fibers, such as carbon fibers to the bulk cement, making it piezoresistive, and enabling changes in the concrete’s electrical resistivity in response to shear stress and strain to be monitored. This state-of-the-art reference work presents experimental results with a realistic theoretical framework, for cement manufactures, concrete technologists and contractors as well as researchers.
Download or read book Resistance of Concrete to Chloride Ingress written by Luping Tang and published by CRC Press. This book was released on 2011-10-06 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chloride ingress in reinforced concrete induces corrosion and consequent spilling and structural weakness, and it occurs world-wide and imposes an enormous cost. Yet it can be resisted by using test methods and relevant models for service life prediction.Resistance of Concrete to Chloride Ingress sets out current understanding of chloride transport
Download or read book The Electrical Resistivity of Concrete written by G. E. Monfore and published by . This book was released on 1968 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Calcined Clays for Sustainable Concrete written by Shashank Bishnoi and published by Springer Nature. This book was released on 2020-04-13 with total page 845 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume comprises the proceedings of the Third International Conference on Calcined Clays for Sustainable Concrete held in New Delhi, India in October 2019. The papers cover topics related to geology of clay, hydration and performance of blended systems with calcined clays, alkali activated binders, and economic and environmental impacts of the use of calcined clays in cement-based materials. The book presents research on influence of processing on reactivity of calcined clays, influence of clay mineralogy on reactivity, geology of clay deposits, and the environmental impact of use of calcined clays in cement and concrete and field applications of calcined clay in concrete. Apart from giving an overview of the progress of research during the last two years, this work also covers the state-of-the art on the practical aspects of production and use of calcined clays in construction. The contents of this volume will prove useful to researchers and graduate students working in the areas of cement chemistry, cement production, and concrete design.
Download or read book Variability Analysis of the Bulk Resistivity Measured Using Concrete Cylinders written by Robert P. Spragg and published by . This book was released on 2011-11-12 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Electrical Resistivity of Concrete with Emphasis on the Use of Electrical Resistance for Measuring Moisture Content written by GA. Woelfl and published by . This book was released on 1979 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The paper describes an investigation of the electrical resistivity of concrete. In particular, electrical resistance of concrete was found to increase with decreasing water-cement ratio and increasing aggregate-cement ratio and entrained air content. The results show that calculating a water-concrete ratio by volume provides a convenient way of comparing the electrical resistivity of concretes of different mix proportions. The study also demonstrates that electrical resistance can be used to measure the moisture content of concrete. Electrical resistance increases as moisture content decreases with the least rate of change within the highest range of moisture contents. Although other techniques for measuring moisture content of concrete are more accurate, the use of electrical resistance has the advantage of being a relatively simple procedure that uses inexpensive equipment.
Download or read book Corrosion of Reinforcement in Concrete written by M Raupach and published by Woodhead Publishing. This book was released on 2014-01-23 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Given the widespread use of reinforced concrete in infrastructure, understanding the corrosion of this material is of major importance. As a result there has been a wealth of research into catalysts, inhibitors and effective means of monitoring the rate of corrosion. Corrosion of reinforcement in concrete: mechanisms, monitoring, inhibitors and rehabilitation techniques summarises some of the most significant research and its implications.The book begins by reviewing findings from various experiments designed to test the corrosion rate of metals induced by a range of factors. Later chapters discuss techniques for monitoring and testing for corrosion. The book concludes by assessing important methods of prevention, including corrosion inhibitors, protective coatings and electrochemical methods for protection, together with rehabilitation procedures for susceptible structures.Filled with practical examples and written by a distinguished team of international contributors, Corrosion of reinforcement in concrete: mechanisms, monitoring, inhibitors and rehabilitation techniques is an essential reference for civil engineers using reinforced concrete. Summarises research into catalysts, inhibitors and effective means of monitoring the rate of corrosion Concludes by assessing important methods of prevention
Download or read book RESISTIVITY OF CONCRETE written by Shu-Leung Norman Lee and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Resistivity of Concrete" by Shu-leung, Norman, Lee, 李樹樑, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Cement, a main composition of concrete, is the major contributor to the greenhouse effect. During the production of cement, a significant amount of carbon dioxide is released to the environment. As the world is moving towards a more sustainable environment, the durability of concrete becomes a concern. The durability of concrete can be improved with proper quality control and resistivity measurement is one of the methods used to indicate the quality of concrete. Because of the importance of resistivity, the present study is to achieve a better understanding of the electrical resistivity of concrete. The effect of various concrete mixtures to concrete resistivity is examined in this study. For the evaluation, surface resistivity is measured on 150mm concrete cubes. The concrete mixtures involves different combination of paste volume, W/C ratio, curing condition and supplementary cementitious materials / fillers. The supplementary cementitious materials are pulverised fuel ash (PFA), condensed silica fume (CSF) and the filler is limestone fines (LF). While PFA and CSF are used as cement replacement, the LF is used for the substitution of cement paste. The results have indicated that the electrical resistivity is affected by the paste volume, W/C ratio, curing condition and the combination of PFA, CSF and LF. Concrete resistivity increases as a result of a decrease in paste volume. A strong correlation exists between the W/C ratio and the surface resistivity. The R DEGREES2 = 0.9211 and 1 for 30% and 34% paste volume respectively. Also, the curing condition affect the moisture content of the concrete. The surface resistivity is higher for a drier surface. With the addition of PFA, CSF and LF, the surface resistivity increases significantly. The present study also examines the correlation between surface resistivity and different concrete properties such as compressive strength, moisture content, water penetration and rapid chloride penetration. The results shows that there is a strong correlation between surface resistivity and compressive strength for plain mixtures with R DEGREES2 = 1. However, this correlation decrease with the addition of other cementitious materials. As a result, the correlation would be better for a separated resistivity curve for different cementitious materials. The surface resistivity and the water penetration only has a moderate correlation. For plain mixtures, the correlation value is R DEGREES2 = 0.6814. R DEGREES2 = 0.7069 is the correlation value for concrete mixtures with PFA and CSF. Finally, there is a strong relationship between rapid chloride penetration and the surface resistivity. The surface resistivity is inversely proportional to the rapid chloride penetration with a correlation of R DEGREES2 = 0.9472. Subjects: Concrete - Electric
Download or read book Performance Based Specifications and Control of Concrete Durability written by Hans Beushausen and published by Springer. This book was released on 2015-09-24 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work gives an overview of significant research from recent years concerning performance-based design and quality control for concrete durability and its implementation. In engineering practice, performance approaches are often still used in combination with prescriptive requirements. This is largely because, for most durability test methods, sufficient practical experience still has to be gained before engineers and owners are prepared to fully rely on them. This book, compiled by RILEM TC 230-PSC, is intended to assist efforts to successfully build the foundation for the full implementation of performance-based approaches through the exchange of relevant knowledge and experience between researchers and practitioners worldwide.
Download or read book Standard Method Test for Surface Resistivity of Concrete s Ability to Resist Chloride Ion Penetration written by American Association of State Highway and Transportation Officials. Technical Subcommittee on Hardened Concrete and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Resistivity and Induced Polarization written by Andrew Binley and published by Cambridge University Press. This book was released on 2020-12-17 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive text on resistivity and induced polarization covering theory and practice for the near-surface Earth supported by modelling software.
Download or read book Engineered Cementitious Composites ECC written by Victor C. Li and published by Springer. This book was released on 2019-04-30 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book on Engineered Cementitious Composites (ECC), an advanced concrete material attracting world-wide attention in both the academic community and in industry. The book presents a comprehensive coverage of the material design methodology, processing methodology, mechanical and durability properties, smart functions, and application case studies. It combines effective use of illustrations, graphical data, and tables. It de-emphasizes mathematics in favor of physical understanding. The book serves as an introduction to the subject matter, or as a reference to those conducting research in ECC. It will also be valuable to engineers who need to quickly search for relevant information in a single comprehensive text.
Download or read book Self Sensing Concrete in Smart Structures written by Baoguo Han and published by Butterworth-Heinemann. This book was released on 2014-07-30 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete is the second most used building material in the world after water. The problem is that over time the material becomes weaker. As a response, researchers and designers are developing self-sensing concrete which not only increases longevity but also the strength of the material. Self-Sensing Concrete in Smart Structures provides researchers and designers with a guide to the composition, sensing mechanism, measurement, and sensing properties of self-healing concrete along with their structural applications Provides a systematic discussion of the structure of intrinsic self-sensing concrete Compositions of intrinsic self-sensing concrete and processing of intrinsic self-sensing concrete Explains the sensing mechanism, measurement, and sensing properties of intrinsic self-sensing concrete
