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Investigating The Hydrogeotechnical And Microstructural Properties Of Cemented Paste Backfill Using The Cuaps Apparatus
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Book Synopsis Investigating the Hydrogeotechnical and Microstructural Properties of Cemented Paste Backfill Using the CUAPS Apparatus by : Erol Yilmaz
Download or read book Investigating the Hydrogeotechnical and Microstructural Properties of Cemented Paste Backfill Using the CUAPS Apparatus written by Erol Yilmaz and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geotechnical Characterization of Cemented Paste Backfill by : Erol Yilmaz
Download or read book Geotechnical Characterization of Cemented Paste Backfill written by Erol Yilmaz and published by LAP Lambert Academic Publishing. This book was released on 2015-02-10 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cemented paste backfill (CPB) technology is now widely utilized by most modern underground hard rock mines in Canada, Australia, the United States, South Africa and Turkey. CPB is a cementitious material produced with three ingredients: filtered wet tailings, hydraulic binders, and mixing water to ensure the paste's flowability in pipeline for final deposition. This book investigates CPB technology using a recently designed lab apparatus called CUAPS (curing under applied pressure system) that estimates in situ CPB conditions. The CUAPS apparatus has been demonstrated as a practical and cost-effective tool that effectively replaces the traditional approach using non-perforated plastic moulds. The results obtained with the CUAPS apparatus will contribute to improve the safety of mines and miners and provide a better understanding of paste backfill. Each section of this book represents an original contribution to the science and engineering of paste backfill. This book provides some theoretical and experimental bases for designing paste backfill mixtures in terms of cost savings and safety and for incorporating in situ backfill behaviour and properties.
Book Synopsis Assessment of the Modified CUAPS Apparatus to Estimate In Situ Properties of Cemented Paste Backfill by : Erol Yilmaz
Download or read book Assessment of the Modified CUAPS Apparatus to Estimate In Situ Properties of Cemented Paste Backfill written by Erol Yilmaz and published by . This book was released on 2010 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper evaluates some improvements in the design of a laboratory apparatus called curing under applied pressure system (CUAPS) designed to estimate in situ properties of cemented paste backfill (CPB). This apparatus is effective in conducting the following tests on samples during curing: (i) One-dimensional consolidation test with or without pore water pressure (PWP) measurement, (ii) PWP dissipation test, (iii) saturated hydraulic conductivity (permeability) test, and (iv) curing under constant or variable vertical pressure. Unconfined compression tests can be also performed on consolidated CPB samples after each of these tests. The modified CUAPS apparatus is assessed in this paper. Preliminary results are promising and validate the functionality of the CUAPS apparatus, which will contribute to the knowledge on consolidation behaviour of in situ CPB material.
Book Synopsis Strength and Environmental Properties of Cemented Paste Backfill That Contains Sodium Silicate by : Hoda Mohammad Pour
Download or read book Strength and Environmental Properties of Cemented Paste Backfill That Contains Sodium Silicate written by Hoda Mohammad Pour and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mining is an important industry that plays a significant role in the development of human civilization and economies. However, the underground mining process produces a large volume of mine wastes (e.g., tailings) as well as creates large voids that require filling, typically with an engineering backfill material. Filling the voids with mine waste materials provides an environmental-friendly way of disposing mining waste. It is also an effective way of increasing ore recovery and improving the safety of miners. One of the best techniques of mine backfill is called cemented paste backfill (CPB), which is typically a mixture of tailings, binder and water. The most common binder used in the preparation of CPB is Portland cement (PC). PC is not only a costly binder, but its production is highly energy-intensive and also generates a large amount of CO2. The cement consumption can represent up to 75% of the cost of CPB. These above-mentioned factors have compelled mining companies to seek for cement alternatives that enhance the engineering properties of the CPB, decrease the cement content and reduce the carbon footprint of the mining industry. Sodium silicate is the most recent chemical additive that is proposed to reduce the binder content in CPB. Sodium silicate is an alkaline solution that is used to activate a pozzolanic material, such as cement, slag and Fly ash. However, the effect of sodium silicate on the strength and key environmental properties (permeability or saturated hydraulic conductivity, reactivity) of CPB is not well understood. The objective of this thesis is to investigate the possibility of using sodium silicate as an activator in cemented paste backfill and obtain an improvement in the aforementioned engineering properties of CPB. In order to determine the effect of the sodium silicate on backfill properties, some CPB testing methods were developed to fulfill the objectives of this research. Thus, the evolution of hydraulic, mechanical and microstructural properties of CPB samples containing sodium silicate (SS-CPB) have been tested or monitored at different curing ages (1, 3, 7, 28 and 90 days) and different CPB mixtures as well. The results of these studies show that activating CPB with sodium silicate develop CPB strength faster than CPB samples without sodium silicate. In addition, hydraulic conductivity and reactivity results show a positive change in samples containing sodium silicate compared to free sodium silicate CPB samples. Indeed, this activation leads to decreasing permeability and reactivity due to the formation of cement hydration products and acceleration of the binder hydration process. Moreover, binder type and content in the presence of sodium silicate as an alkali activator in the CPB play a significant role in lowering hydraulic conductivity and reactivity of CPB.
Author :Dragana Simon Publisher :Library and Archives Canada = Bibliothèque et Archives Canada ISBN 13 :9780494027202 Total Pages :514 pages Book Rating :4.0/5 (272 download)
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.
Book Synopsis Handbook on Mine Fill by : Yves Potvin
Download or read book Handbook on Mine Fill written by Yves Potvin and published by . This book was released on 2005 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ground Support in Mining and Underground Construction by : Ernesto Villaescusa
Download or read book Ground Support in Mining and Underground Construction written by Ernesto Villaescusa and published by Taylor & Francis. This book was released on 2004-09-15 with total page 1270 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of ground support is to safely maintain excavations for their expected lifespan. The effectiveness of ground support can be seen both in terms of personnel and equipment safety, and in terms of allowing the most economic extraction. Scientists, practitioners and technology developers have contributed to this volume, which covers rock ma
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.
Book Synopsis Handbook of Alkali-Activated Cements, Mortars and Concretes by : F. Pacheco-Torgal
Download or read book Handbook of Alkali-Activated Cements, Mortars and Concretes written by F. Pacheco-Torgal and published by Elsevier. This book was released on 2014-11-20 with total page 855 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an updated state-of-the-art review on new developments in alkali-activation. The main binder of concrete, Portland cement, represents almost 80% of the total CO2 emissions of concrete which are about 6 to 7% of the Planet’s total CO2 emissions. This is particularly serious in the current context of climate change and it could get even worse because the demand for Portland cement is expected to increase by almost 200% by 2050 from 2010 levels, reaching 6000 million tons/year. Alkali-activated binders represent an alternative to Portland cement having higher durability and a lower CO2 footprint. Reviews the chemistry, mix design, manufacture and properties of alkali-activated cement-based concrete binders Considers performance in adverse environmental conditions. Offers equal emphasis on the science behind the technology and its use in civil engineering.
Book Synopsis Geotechnical Engineering for Mine Waste Storage Facilities by : Geoffrey E. Blight
Download or read book Geotechnical Engineering for Mine Waste Storage Facilities written by Geoffrey E. Blight and published by CRC Press. This book was released on 2009-11-16 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is a comprehensive treatment of the application of geotechnical engineering to site selection, site exploration, design, operation and closure of mine waste storage facilities.The level and content are suitable as a technical source and reference for practising engineers engaged both in the design and operational management of mine waste s
Book Synopsis Mine Planning and Equipment Selection by : Carsten Drebenstedt
Download or read book Mine Planning and Equipment Selection written by Carsten Drebenstedt and published by Springer Science & Business Media. This book was released on 2013-10-16 with total page 1464 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited volume includes all papers presented at the 22nd International Conference on Mine Planning and Equipment Selection (MPES), Dresden, Germany, 2013. Mineral Resources are needed for almost all processes of modern life, whilst the mining industry is facing strict requirements regarding efficiency and sustainability. The research papers in this volume deal with the latest developments and research results in the fields of mining, machinery, automatization and environment protection.
Book Synopsis Paste and Thickened Tailings - a Guide Third Edition by : Richard J. Jewell
Download or read book Paste and Thickened Tailings - a Guide Third Edition written by Richard J. Jewell and published by . This book was released on 2015-05-05 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Paste and Thickened Tailings by : Richard J. Jewell
Download or read book Paste and Thickened Tailings written by Richard J. Jewell and published by . This book was released on 2006 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cement Chemistry written by H F W Taylor and published by Thomas Telford. This book was released on 1997-04 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: A revised and updated text on cement chemistry. This edition forms a comprehensive and in-depth reference work that explains in detail all aspects of cement chemistry.
Book Synopsis Underground Mining Methods by : W. A. Hustrulid
Download or read book Underground Mining Methods written by W. A. Hustrulid and published by SME. This book was released on 2001 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: Underground Mining Methods presents the latest principles and techniques in use today. Reflecting the international and diverse nature of the industry, a series of mining case studies is presented covering the commodity range from iron ore to diamonds extracted by operations located in all corners of the world. Industry experts have contributed 77 chapters. This book is certain to become a standard for every practicing mining engineer and student alike. Sections include: General Mine Design Considerations, Room-and-Pillar Mining of Hard Rock/Soft Rock, Longwall Mining of Hard Rock, Shrinkage Stoping, Sublevel Stoping, Cut-and-Fill Mining, Sublevel Caving, Panel Caving, Foundations for Design, and Underground Mining Looks to the Future.
Book Synopsis FLAC and Numerical Modeling in Geomechanics by : Christine Detournay
Download or read book FLAC and Numerical Modeling in Geomechanics written by Christine Detournay and published by CRC Press. This book was released on 2020-12-17 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sixty-five papers cover a wide range of topics from engineering applications to theoretical developments in the areas of embankment and slope stability, underground cavity design and mining; dynamic analysis, soil and structure interaction, and coupled processes and fluid flow.
Book Synopsis A Practical Guide to Neural Nets by : Marilyn McCord Nelson
Download or read book A Practical Guide to Neural Nets written by Marilyn McCord Nelson and published by Addison Wesley Publishing Company. This book was released on 1994 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on a course given to internal managers at Texas Instruments, this book is an introduction to neural nets for computer science, artificial intelligence and R & D professionals, as well as MIS or DP managers.
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