Prediction of Mechanical Performance of Cemented Paste Backfill by the Electrical Resistivity Measurement

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ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Prediction of Mechanical Performance of Cemented Paste Backfill by the Electrical Resistivity Measurement by : Wenbin Xu

Download or read book Prediction of Mechanical Performance of Cemented Paste Backfill by the Electrical Resistivity Measurement written by Wenbin Xu and published by . This book was released on 2018 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cemented Paste Backfill (CPB) has become a useful practice in many modern operations around the world. This method is an innovative tailings disposal and underground mine backfilling scheme that returns much of this material to the underground stope field. Thus, it is of great interest for financial and security reasons to fully comprehend the mechanical performance of such underground CPB. Uniaxial compressive strength (UCS) is one of the most commonly used parameters for evaluating the mechanical performance of CPB. Electrical resistivity (ER) measurement, which is a method of nondestructive testing, can also be used to determine the mechanical properties of CPB. This study was undertaken to suggest a nondestructive testing method that would permit prediction of the UCS of a CPB within 90 days. Five CPB samples were prepared at different cement-to-tailing ratios (1/4, 1/6, and 1/8 by weight) and solid content (65 and 70 wt. %), and a curing period of 3-90 days was used for ER measurement. Seventy-five CPB samples were prepared with the same cement content as those used in the pastes for UCS tests cured for 3, 7, 28, 56, and 90 days. The results of the ER measurement show that the ER versus curing periods of 3-90 days first drop to a minimum value and then gradually increase with time. The greater ER values of CPB are reached when the greater cement-to-tailing ratio and solid content is used. A logarithmic relationship is established between the UCS and the ER of CPB at 90 days. It is possible that a nondestructive method could be developed to evaluate the strength of underground CPB based on the obtained logarithmic relationship with ER at 90 days.

Cemented Paste Backfill

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Publisher : Elsevier
ISBN 13 : 0443160554
Total Pages : 358 pages
Book Rating : 4.4/5 (431 download)

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Book Synopsis Cemented Paste Backfill by : Yong Wang

Download or read book Cemented Paste Backfill written by Yong Wang and published by Elsevier. This book was released on 2024-06-03 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: In view of the demand for the research on the transport resistance characteristics and mechanical properties of CPB under the influence of temperature effect, the book comprehensively describes the studies on rheological and mechanical properties of CPB materials used in underground metal mines. This book covers a wide range of topics, including a new definition of CPB, past participation and flow-induced corrosion of pipeline under the constant temperature condition, multiphysics processes in CPB and the associated consolidation process, the variation of rheological parameters and transport resistance, prediction model for rheological properties, mechanical behavior and properties of CPB and fiber-reinforced CPB, and control technology to reduce the adverse effect of temperature. Therefore, an academic framework for the transport resistance characteristics and mechanical properties under the temperature effect was established in this book. Investigates rheological properties and multiphysics processes in CPB materials around the world Looks into systematic studies on pipe transport and mechanical properties of CPB under temperature effects Focuses mainly on the effect of temperature on paste transport and mechanical properties under the temperature effect, which provides a theoretical basis for safe and efficient filling operation and associated future research in this field Offer in-depth insights into the evolution of the rheological and mechanical properties of CPB under the effect of temperatures

Electrical Resistivity and Temperature of Fresh Cement Paste as Indicators for Setting Time

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (129 download)

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Book Synopsis Electrical Resistivity and Temperature of Fresh Cement Paste as Indicators for Setting Time by : Ahmad Shahroodi

Download or read book Electrical Resistivity and Temperature of Fresh Cement Paste as Indicators for Setting Time written by Ahmad Shahroodi and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The process, rate, and quality of cement hydration (a complex physical-chemical process) affect the properties development of concrete, such as its compressive strength, penetrability, and setting. Among all, setting time is one of the important properties for the concrete industry, as it is the factor in determining the consolidation, finishing, and curing time of a concrete pour. Inadequate determination of concrete setting time will result in improper finishing, formation of cold joints between layers of concrete, and curing time delay. Therefore, short- and long-term performance of concrete, concrete durability, and its life span will be affected. Concrete setting time proceeds from an initial stage (end of concrete pouring and consolidation) to a final stage (end of finishing process and beginning of curing) with the hydration of cement particles in the matrix of concrete. The accurate determination of the setting time in concrete projects has always been a question. Setting time is measured in laboratory setups by the traditional method of the Vicat needle (as standardized in ASTM C191). However, the field condition of a concrete pour is different from a lab set up, so the importance of replacing a lab-based setting time test with a field applicable method is out of question. This research project studies the feasibility of using a practical and non-destructive technique to detect the actual concrete setting time and its development in a reasonable amount of time. In this research, the electrical properties and internal temperature of cementing-based mixtures are monitored over the first 24 hours of hydration. The electrical properties of concrete and cement-based materials and corresponding internal temperature are influenced by many factors affected by cement hydration, similar to the setting time. The main goal of this research project is to establish a predicting method for the fresh cement paste setting time by monitoring either the electrical properties or the internal temperature of the mixture. To isolate the effect of the specimen geometry, electrical resistivity has been chosen as the electrical properties' representative in this study. It is measured by a novel resistivity-meter setup. However, to develop a time-saving and accurate method, microstructure factors affecting the electrical resistivity development of fresh cement paste need to be studied. These factors are (1) the ionic concentration and ionic variation in the pore solution (in the liquid phase of the cement paste microstructure), and (2) the hydration products formation and crystallization (or the physical characteristics of the cement paste microstructure). Since formation of hydration products and crystallization are exothermic, the changes in the internal temperature of the materials are also monitored. Finally, reliable predicting indicators, electrical resistivity and internal temperature values, which are influenced by not only the fresh stage ionic concentration, but also by the development and changes in the physical characteristics of microstructure are proposed to the industry.

Mechanical Properties of Cemented Paste Backfill Under Low Confining Stress

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)

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Book Synopsis Mechanical Properties of Cemented Paste Backfill Under Low Confining Stress by : Andrew Ning Pan

Download or read book Mechanical Properties of Cemented Paste Backfill Under Low Confining Stress written by Andrew Ning Pan and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cemented paste backfill (CPB) plays an increasingly important role in the mining industry due to rapid delivery rate, tight-filling characteristics, relatively insignificant water management issues during filling, and generally uniform as-placed mechanical properties. The most common basis for assessing backfill strength is Unconfined Compressive Strength (UCS), and some of the most commonly used design methods have UCS as a fundamental design parameter. However, actual CPB properties and behavior under the range of confining stresses relevant to these design methods has been studied very little. This work uses UCS tests and a novel direct tensile test method and compares test results with strengths obtained from direct shear tests. A form of punching shear was also investigated, but the results were found unsatisfactory for design purposes. For materials with UCS up to about 1 MPa, the UCS and tensile strengths are consistent with the Mohr-Coulomb failure envelope obtained from direct shear tests.

Fatigue Mechanical Behaviors of Rock-Backfill Composites: Laboratory Study

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Publisher : Scientific Research Publishing, Inc. USA
ISBN 13 : 1649979339
Total Pages : 222 pages
Book Rating : 4.6/5 (499 download)

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Book Synopsis Fatigue Mechanical Behaviors of Rock-Backfill Composites: Laboratory Study by : Yu Wang

Download or read book Fatigue Mechanical Behaviors of Rock-Backfill Composites: Laboratory Study written by Yu Wang and published by Scientific Research Publishing, Inc. USA. This book was released on 2024-07-18 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is intended as a reference book for advanced graduate students and re-search engineers in rock mechanics related to mining engineering. The cemented tailings backfill (CTB) technique is widely used in deep underground mining, since this tech-nique is effective to support surrounding rock, control rockburst, reduce ground sub-sistence, and reduce surface disposal of tailings. Plenty of investigations have been attempted to experimentally or numerically evaluate the strength of CTB with different components (e.g., mixture of cement, tailings, fly ash, blast furnace slag, etc.) to ensure the geological stability when extracting adjacent stopes. After extracting ore from stopes, CTB is filled in the gob, stress redistribution occurs in the backfill stope and surrounding rocks. Due to the elasticity mismatch of these two kinds of material, differential de-formation occurs and they both resist the overburden pressure and deformation. As a result, the interactions between the surrounding rock and tailing backfill material have significant role in maintaining the long-term stability of mine stopes. Apart from the investigations on the static mechanical behaviors of rock- backfill composited backfill (RBCS) material, the RBCS in the stope are also exposed to disturbed stress (e.g., blast vibration, excavation, earthquake, etc.), and the disturbed stress is usually equivalent to cyclic or fatigue loads. As a result, investigations on rock-backfill interactions subjected to the disturbed stress are critical and significant to maintain the long- term stability of mine stopes.

Early Age Mechanical Behavior and Stiffness Development of Cemented Paste Backfill with Sand

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Publisher :
ISBN 13 : 9780494781098
Total Pages : 412 pages
Book Rating : 4.7/5 (81 download)

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Book Synopsis Early Age Mechanical Behavior and Stiffness Development of Cemented Paste Backfill with Sand by : Abdullah Muhammad Galaa Muhammad Idris Abdelaal

Download or read book Early Age Mechanical Behavior and Stiffness Development of Cemented Paste Backfill with Sand written by Abdullah Muhammad Galaa Muhammad Idris Abdelaal and published by . This book was released on 2011 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid delivery of backfill to support underground openings attracted many mines to adopt paste backfilling methods. As a precaution to prevent liquefaction and to improve the mechanical performance of backfills, a small portion of a binder is added to the paste to form the cemented paste backfill (CPB). Recently, adding sand to mine tailings (MT) in CPB mixes has attracted attention since it enhances the flow and mechanical characteristics of the pastefill. This thesis investigates the effects of adding sand to CPB on the undrained mechanical behavior of the mixture (CPBS) under monotonic and cyclic loads. Liquefaction investigations took place at the earliest practically possible age. Beyond this age, the present research focused on characterizing the evolution of stiffness and obtaining the values of the stiffness parameters that could be useful for designing and modeling backfilling systems.The evolution of effective stiffness parameters for two CPB-sand mixtures was monitored in a non-destructive triaxial test for five days. Self-desiccation was found to not be influential on the development of early age stiffness. Moreover, a framework is suggested to predict the undrained stiffness at degrees of saturation representative of the field. The credibility of the proposed test in providing stiffness parameters at representative strain levels of the field was verified.The liquefaction investigation involved monotonic compression and extension triaxial tests. Neither flow nor temporary liquefaction was observed for all cemented and uncemented specimens under monotonic compression, while temporary liquefaction was observed for all specimens under monotonic extension. The addition of binder and sand to MT was found to slightly strengthen the pastefill in compression while weakening it in extension. Under cyclic loading, the addition of sand negatively impacted the cyclic resistance. However, binder was found to be more effective in the presence of sand. All specimens exhibited a cyclic mobility type of response.

Microscale Analysis of Cemented Paste Backfill [microform]

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Publisher : Library and Archives Canada = Bibliothèque et Archives Canada
ISBN 13 : 9780494027202
Total Pages : 514 pages
Book Rating : 4.0/5 (272 download)

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Book Synopsis Microscale Analysis of Cemented Paste Backfill [microform] by : Dragana Simon

Download or read book Microscale Analysis of Cemented Paste Backfill [microform] written by Dragana Simon and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2005 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study shows that wave-based techniques provide insight into some of the factors that affect the behaviour of CPB. Electromagnetic wave-based measurements are sensitive to changes in structure, free water content, bound water content, and ion availability and/or mobility. This research shows that the effective conductivity is a useful parameter to monitor the hydration process, even in low cement content pastes. Shear wave-based measurements are a useful tool to monitor the stiffness evolution in CPB. Apparent yield stress measurements are sensitive to particle-particle interactions and reflect changes in the material's composition, including water content, binder content and type, and chemical additives. All tests show that during the early stages, Portland cement hydration has little effect on the microstructure development, stiffness and flow characteristics of cement-containing pastes. The macroscopic properties of cemented paste backfill (CPB), including fluidity and strength, depend on particle-particle and particle-fluid interactions; thus, it is important to determine the fundamental interactions between the paste constituents to optimize paste design. Specific topics of interest in this study include the effects of paste composition (e.g., binder content and type, and pore fluid chemistry) on the microstructure development, and electromagnetic, rheological and mechanical properties (e.g., setting time, unconfined compressive strength and stiffness) with time. The effect of the pore fluid chemistry on the properties of the CPB depends on the type and amount of the additive. In CPB, calcium chloride and sodium chloride accelerate cement hydration and improve the UCS during the first six months of hydration. Conversely, ferric chloride and hydrochloric acid retard the hydration and setting of CPB. The tested superplasticizers retard cement hydration, increase the UCS and lower the apparent yield stress of CPB. A drawback to using the superplasticizers tested in this study is that a high shear stress is required to re-initiate flow in the pastes.

Using Thermal Profiles of Cemented Paste Backfill to Predict Strength

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Publisher :
ISBN 13 : 9780494761090
Total Pages : 278 pages
Book Rating : 4.7/5 (61 download)

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Book Synopsis Using Thermal Profiles of Cemented Paste Backfill to Predict Strength by : Mahsa Mozaffaridana

Download or read book Using Thermal Profiles of Cemented Paste Backfill to Predict Strength written by Mahsa Mozaffaridana and published by . This book was released on 2011 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurement of the strength development of Cemented Paste Backfill in laboratory cast cylinders does not replicate the in situ strengths of CPB in mine stopes. The mass of CPB in a filled stope is large and temperature rises due to the heat of hydration of the cementing materials, thus accelerating the gain in strength, relative to laboratory specimens stored at ambient temperature. The purpose of this study was to determine the impact on strength development when CPB test cylinders were subjected to a temperature profile mimicking that in a large mass, such as a mine stope. Also, maturity (the integral of time and temperature during hydration of the CPB) was compared to actual strengths, and the maturity -- strength concept used in concrete technology was applied. It was found that the strength- maturity relationship was applicable to CPB once the base line or datum temperature was adjusted.

Nondestructive Testing of Materials and Structures

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Publisher : Springer Science & Business Media
ISBN 13 : 9400707231
Total Pages : 1231 pages
Book Rating : 4.4/5 (7 download)

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Book Synopsis Nondestructive Testing of Materials and Structures by : Oral Büyüköztürk

Download or read book Nondestructive Testing of Materials and Structures written by Oral Büyüköztürk and published by Springer Science & Business Media. This book was released on 2012-09-14 with total page 1231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Condition assessment and characterization of materials and structures by means of nondestructive testing (NDT) methods is a priority need around the world to meet the challenges associated with the durability, maintenance, rehabilitation, retrofitting, renewal and health monitoring of new and existing infrastructures including historic monuments. Numerous NDT methods that make use of certain components of the electromagnetic and acoustic spectrum are currently in use to this effect with various levels of success and there is an intensive worldwide research effort aimed at improving the existing methods and developing new ones. The knowledge and information compiled in this book captures the current state of the art in NDT methods and their application to civil and other engineering materials and structures. Critical reviews and advanced interdisciplinary discussions by world-renowned researchers point to the capabilities and limitations of the currently used NDT methods and shed light on current and future research directions to overcome the challenges in their development and practical use. In this respect, the contents of this book will equally benefit practicing engineers and researchers who take part in characterization, assessment and health monitoring of materials and structures.

Minefill 2020-2021

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Publisher : CRC Press
ISBN 13 : 1000454215
Total Pages : 450 pages
Book Rating : 4.0/5 (4 download)

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Book Synopsis Minefill 2020-2021 by : Ferri Hassani

Download or read book Minefill 2020-2021 written by Ferri Hassani and published by CRC Press. This book was released on 2021-06-02 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series of International Symposiums on Mining with Backfill explores both the theoretical and practical aspects of the application of mine fill, with many case studies from both underground and open-pit mines. Minefill attendees and the Proceedings book audience include mining practitioners, engineering students, operating and regulatory professionals, consultants, academics, researchers, and interested individuals and groups. The papers presented at Minefill symposiums regularly offer the novelties and most modern technical solutions in technology, equipment, and research. In that way, the papers submitted for the Minefill Symposia represent the highest quality and level in the conference domain. For the 2020-2021 edition organizers hope that the papers presented in this publication will also be received with interest by readers around the world, providing inspiration and valuable examples for industry and R&D research.

Paste Tailings Management

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Publisher : Springer
ISBN 13 : 331939682X
Total Pages : 302 pages
Book Rating : 4.3/5 (193 download)

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Book Synopsis Paste Tailings Management by : Erol Yilmaz

Download or read book Paste Tailings Management written by Erol Yilmaz and published by Springer. This book was released on 2017-03-03 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an overview of paste tailings disposal at mine sites. It deals comprehensively with the characterization of sulphide-rich tailings, geotechnical and microstructural behaviour, surface tailings disposal applications, underground paste backfilling, and case studies. The authors place emphasis on the characterization, monitoring, disposal and treatment, as well as environmental considerations of problematic sulphidic tailings. The framework is supported by worldwide case studies.

Cement and Concrete Chemistry

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Publisher : Springer Science & Business
ISBN 13 : 9400779453
Total Pages : 705 pages
Book Rating : 4.4/5 (7 download)

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Book Synopsis Cement and Concrete Chemistry by : Wieslaw Kurdowski

Download or read book Cement and Concrete Chemistry written by Wieslaw Kurdowski and published by Springer Science & Business. This book was released on 2014-04-24 with total page 705 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph describes cement clinker formation. It covers multicomponent systems, clinker phase structures and their reactions with water, hydrate composition and structure, as well as their physical properties. The mineral additions to cement are described as are their influence on cement-paste properties. Special cements are also discussed. The microstructure of concrete is then presented, and special emphasis is given to the role of the interfacial transition zone, and the corrosion processes in the light of cement-phase composition, mineral additions and w/c ratio. The admixtures' role in modern concrete technology is described with an emphasis on superplasticizer chemistry and its cement-paste rheological modification mechanism. Cement with atypical properties, such as calcium aluminate, white, low energy and expansive cements are characterized. The last part of the book is devoted to special types of concrete such as self compacting and to reactive powders.

Interfacial Transition Zone in Concrete

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Publisher : CRC Press
ISBN 13 : 0203627253
Total Pages : 218 pages
Book Rating : 4.2/5 (36 download)

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Book Synopsis Interfacial Transition Zone in Concrete by : J.C. Maso

Download or read book Interfacial Transition Zone in Concrete written by J.C. Maso and published by CRC Press. This book was released on 2004-03-01 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: An important new state-of-the-art report prepared by RILEM Technical Committee 108 ICC. It has been written by a team of leading international experts from the UK, USA, Canada, Israel, Germany, Denmark, South Africa, Italy and France. Research studies over recent years in the field of cement science have focused on the behaviour of the interfaces between the components of cement-based materials. The techniques used in other areas of materials science are being applied to the complex materials found in cements and concretes, and this book provides a significant survey of the present state of the art.

Assessment of the Performance of Engineered Waste Containment Barriers

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Publisher : National Academies Press
ISBN 13 : 0309108098
Total Pages : 135 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Assessment of the Performance of Engineered Waste Containment Barriers by : National Research Council

Download or read book Assessment of the Performance of Engineered Waste Containment Barriers written by National Research Council and published by National Academies Press. This book was released on 2007-09-22 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: President Carter's 1980 declaration of a state of emergency at Love Canal, New York, recognized that residents' health had been affected by nearby chemical waste sites. The Resource Conservation and Recovery Act, enacted in 1976, ushered in a new era of waste management disposal designed to protect the public from harm. It required that modern waste containment systems use "engineered" barriers designed to isolate hazardous and toxic wastes and prevent them from seeping into the environment. These containment systems are now employed at thousands of waste sites around the United States, and their effectiveness must be continually monitored. Assessment of the Performance of Engineered Waste Containment Barriers assesses the performance of waste containment barriers to date. Existing data suggest that waste containment systems with liners and covers, when constructed and maintained in accordance with current regulations, are performing well thus far. However, they have not been in existence long enough to assess long-term (postclosure) performance, which may extend for hundreds of years. The book makes recommendations on how to improve future assessments and increase confidence in predictions of barrier system performance which will be of interest to policy makers, environmental interest groups, industrial waste producers, and industrial waste management industry.

Concrete

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Publisher :
ISBN 13 : 9789339204761
Total Pages : pages
Book Rating : 4.2/5 (47 download)

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Book Synopsis Concrete by : P. Kumar Mehta

Download or read book Concrete written by P. Kumar Mehta and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The most comprehensive and current guide to the properties, behavior, and technology of concrete.- This thoroughly updated edition contains new information on: Recently built construction projects worldwide; Shrinkage-reducing admixtures; Self-consolidating concrete, pervious concrete, internal curing, and other cutting-edge innovations; Modeling of ice formation and alkali-aggregate reaction in concrete; Environmental impact of concrete. - Each chapter begins with a preview of the contents and ends with a self-test and a guide for further reading. More than 300 drawings and photographs illustrate the topics discussed in this definitive text on concrete.

Advanced Concrete Technology

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Publisher : John Wiley & Sons
ISBN 13 : 0470902434
Total Pages : 698 pages
Book Rating : 4.4/5 (79 download)

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Book Synopsis Advanced Concrete Technology by : Zongjin Li

Download or read book Advanced Concrete Technology written by Zongjin Li and published by John Wiley & Sons. This book was released on 2011-01-11 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past two decades concrete has enjoyed a renewed level of research and testing, resulting in the development of many new types of concrete. Through the use of various additives, production techniques and chemical processes, there is now a great degree of control over the properties of specific concretes for a wide range of applications. New theories, models and testing techniques have also been developed to push the envelope of concrete as a building material. There is no current textbook which brings all of these advancements together in a single volume. This book aims to bridge the gap between the traditional concrete technologies and the emerging state-of-the-art technologies which are gaining wider use.

Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions

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Publisher : CRC Press
ISBN 13 : 0429632010
Total Pages : 8083 pages
Book Rating : 4.4/5 (296 download)

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Book Synopsis Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions by : Francesco Silvestri

Download or read book Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions written by Francesco Silvestri and published by CRC Press. This book was released on 2019-07-19 with total page 8083 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions contains invited, keynote and theme lectures and regular papers presented at the 7th International Conference on Earthquake Geotechnical Engineering (Rome, Italy, 17-20 June 2019. The contributions deal with recent developments and advancements as well as case histories, field monitoring, experimental characterization, physical and analytical modelling, and applications related to the variety of environmental phenomena induced by earthquakes in soils and their effects on engineered systems interacting with them. The book is divided in the sections below: Invited papers Keynote papers Theme lectures Special Session on Large Scale Testing Special Session on Liquefact Projects Special Session on Lessons learned from recent earthquakes Special Session on the Central Italy earthquake Regular papers Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions provides a significant up-to-date collection of recent experiences and developments, and aims at engineers, geologists and seismologists, consultants, public and private contractors, local national and international authorities, and to all those involved in research and practice related to Earthquake Geotechnical Engineering.