Download or read book Geoenvironmental Impacts of Using High Carbon Fly Ash in Structural Fill Applications written by Ahmet H. Aydilek and published by . This book was released on 2013 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluated the leaching potential of metals from highway base layers stabilized with high carbon fly ashes (HCFAs) and highway embankment structures amended with HCFA. Three different laboratory tests were conducted: (1) batch water leach tests, (2) toxicity characteristics leaching procedure tests, and (3) column leach test. Additionally, two numerical modeling analyses were conducted: (1) WiscLEACH and (2) MINTEQA2. Analyses were conducted on eight fly ashes and two locally available sandy soil materials that are mainly used in highway base layer and highway embankment structures.
Download or read book Fly Ash written by Prabir Kumar Sarker and published by Nova Science Publishers. This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fly ash is a by-product of the combustion of coal and other waste materials. In recent years, there has been intensive research on fly ash because of the increasing demand for the recycling of industrial by-products to improve sustainability in manufacturing and infrastructure. This book presents some of the latest developments in the generation, characterisation, utilisation and environmental impacts of fly ash. Recent developments on the methods of collection and analysis of fly ash, and novel applications such as in geopolymers and recovery of resources from fly ash are included. The book is intended for professionals in research and academics, and students interested in materials and sustainability. The book consists of 17 chapters contributed by 42 authors. Each chapter ends with an extensive list of references for further information. The topics on fly ash have been grouped into the following three parts: Part 1: various sources, methods of collection, factors influencing collection efficiency, flow and hydrodynamic behaviours, methods of characterisation, physical, chemical, leaching and radiation properties, and extraction of metals from fly ash; Part 2: different technological initiatives on utilisation, applications in the construction industry, use as a supplementary cementitious material, alkali-activated binder, polypropylene composite materials, and behaviour of fly ash geopolymer concrete; and Part 3: health and environmental issues such as the effects on lung and heart, bioleaching for detoxification, ash from incinerated wastes, and lifecycle assessment of civil structures using fly ash.
Download or read book Fly Ash Facts for Highway Engineers written by American Coal Ash Association and published by . This book was released on 2003 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coal fly ash is a coal combustion product that has numerous applications in highway construction. Since the first edition of "Fly Ash Facts for Highway Engineers" in 1986, the use of fly ash in highway construction has increased and new applications have been developed. This document provides basic technical information about the various uses of fly ash in highway construction that advances its use in ways that are technically sound, commercially competitive and environmentally safe.
Download or read book Geo Environmental Design Practice in Fly Ash Disposal Utilization written by Umesh Dayal and published by Allied Publishers. This book was released on 2005 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Legislation Technology and Practice of Mine Land Reclamation written by Zhenqi Hu and published by CRC Press. This book was released on 2014-09-23 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt: Legislation, Technology and Practice of Mine Land Reclamation contains the proceedings of the Beijing International Symposium on Land Reclamation and Ecological Restoration (LRER 2014, Beijing, China, 16-19 October 2014). The contributions cover a wide range of topics: - Monitoring, prediction and assessment of environmental damage in mining areas - Subsidence land reclamation and ecological restoration - Soil, vegetation and biological diversity - Mining methods and measures for minimization of land and environmental damage - Solid wastes and AMD treatment - Contaminated land remediation - Land reclamation and ecological restoration policies and management - Surface mined land reclamation and ecological restoration - Case study on mining reclamation and ecological restoration Legislation, Technology and Practice of Mine Land Reclamation will be of interest to engineers, scientists, consultants, government officials and students involved in environmental engineering, soil science, ecology, forestry, mining, and land reclamation and ecological restoration in mining areas.
Download or read book Properties and Use of Coal Fly Ash written by Lindon K.A. Sear and published by Thomas Telford. This book was released on 2001-10-15 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book draws together a large quantity of research that has been carried out on pulverised fuel ash (PFA) over the past 30 years.In addition to covering the potential uses of PFA it provides an overview of the benefits of use.
Download or read book Enhancing the Beneficial Use of Fly Ash in Concrete and in Mine Reclamation written by Mina Mohebbi and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion of coal to generate electricity produces huge volume of coal combustion products (CCPs) annually in the United States. Due to their promising physical and chemical characteristics, these byproducts can be beneficially used as supplementary cementitious materials (SCM) in portland cement concrete, mining applications, structural fills, and soil and waste stabilization. However, the efficiency and environmental impacts of such beneficial uses need to be further evaluated and enhanced. The unburned carbon (UC) content of fly ash impacts the performance (e.g., air entrainment and rheology) of concrete mixtures. The conventional loss on ignition (LOI) test to measure the UC may be overestimating as the weight change upon igniting fly ash could be the result of other physical and chemical reactions (e.g., calcination of carbonates, removal of bound water, and iron and sulfur oxidation) in addition to organic carbon burning. Moreover, reclamation of mine sites using coal ash has been shown to potentially alleviate the negative effects of mining activities such as neutralizing the acid mine drainage. However, during coal combustion process, trace elements are concentrated onto fly ash particles, and the long-term leaching of harmful elements from coal ash to subsurface aquifers is an environmental concern. This research studies focuses on evaluating and enhancing the beneficial uses of fly ash (as the predominant coal combustion byproduct) in two areas: 1- in portland cement concrete through measuring the UC content, and 2- in mine site reclamation through evaluating the leaching behavior of fly ash deposits to water resources in short and long terms. In the first part of this research study, a two-atmosphere thermogravimetric analysis (2A-TGA) coupled with mass spectrometry was performed to evaluate the chemical reactions that occur upon heating of fly ash and to measure the true UC content. 2A-TGA was performed under two distinct atmospheres: (i) in non-oxidizing helium gas, to measure weight loss due to decomposition of carbonates and loss of bound water, and (ii) in oxidizing air, to measure weight loss due to conversion of UC to CO2. The results were also compared with the total carbon (TC) measured using infrared spectroscopy. It was found that there is no one-to-one relationship between the LOI and the TC or UC contents of fly ash. LOI overestimated TC by up to 2.5 and overestimated UC by up to 6.4. Based on the results of this study, a practical alternative to 2A-TGA could be to heat fly ash in a non-oxidizing atmosphere (e.g., vacuum, He- or N2-purged furnace) up to 750 oC, followed by a conventional LOI test.In the second part of this study, leaching behavior of fly ash deposits was evaluated through (i) defining the host phases for environmentally important elements and (ii) developing a reactive transport model to predict the long-term leaching behavior. Determining the host phases was achieved through micro-characterizing the coal ash and flow-through column leaching tests. It was found that amorphous aluminosilicate is the main host phase for Si, Al, Fe, and, Mg. Alkalis such as Na, K, and trace elements including As and Se are also distributed in the bulk Al-Si glass in low concentrations. The Initially high concentrations of Ca and S in the leachate were mainly due to the dissolution of gypsum. Surface associated salts (e.g., sulfate and borate salts) dissolve Na, K, S, and B ions at early stages of leaching. Iron was found both as ferromagnetic particles containing magnetite and hematite, and also included in the amorphous phase in lower amounts. The host phases were then considered as input data for a quantitative reactive transport 1D model using CrunchFlow code. The calibrated model was used to predict the concentration of major elements (Ca, S, Si, Al, Fe, Na, K, Mg), and trace elements (As, Mo, Se, B) along 10 years of leaching. The leachate composition at early ages of leaching might exceed the environmental limits for S, B, Mo, and Al. However, in long-term the overall composition meets the leaching limits except for aluminum content. The porosity of compacted fly ash starts to increase from the top layers, and in long-term (e.g., 30 years of weathering) it reached from 28% to 45%, which can significantly affect the stability and transport properties.
Download or read book Perspectives on Bulk Use of Fly Ash written by and published by . This book was released on 1997 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization of the MSU Power Plant Fly Ash for Concrete and Other Applications written by Austin Okwuegbu and published by . This book was released on 1989 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report on High volume Fly Ash Concrete for Structural Applications written by ACI Committee 232 and published by . This book was released on 2014 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Utilisation of Fly Ash in Structural Concrete for Sustainable Construction written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Our industrial world produces huge quantities of fly ash, which is a waste and need to be disposed safely or else it can cause disastrous consequences. The disposal of fly ash has been causing a headache to the environmentalists across the globe. Fly ash is a high pozzolanic industrial waste which has the substantial potential to substitute Portland cement, a major producer of CO2 and thereby decreasing greenhouse gas emissions. The production of fly ash is increasing in every year but the utilisation of fly ash is not even half of the production of fly ash. The effective utilisation of fly ash is restricted only to manufacture of bricks, producing fly ash based pozzolanic cement and use in pavements. To utilise the fly ash in high volume the innovative idea is fly ash used as a replacement material for cement and fine aggregate in structural concrete like RCC beam, concrete paver blocks, making fly ash pellets and fly ash angular aggregate. Concrete paver blocks are being used for various purposes like paving of approaches, paths, parking places and footpaths. They also find their application in roadways or pavements. The increasing costs of construction or building materials and the need to meet sustainable development, different alternative construction methods, techniques and materials are being used extensively to replace old conventional methods. So as to enhance and improvise the applications of concrete paver blocks, proper knowledge and understanding of the products produced with materials, which are available locally and mineral admixtures, which are produced indigenously is essential. This paper discusses sand replacement with fly ash, coarse aggregate replacement with fly ash pellets in low grade concrete, cement and sand replacement with fly ash in high grade concrete paver blocks. For low grade of concrete, the mix design was prepared for M20 concrete as per IS method. Sand was replaced partially with fly ash up to 60% by weight. To know the effect of
Download or read book Problematic Soils and Geoenvironmental Concerns written by Madhavi Latha Gali and published by Springer Nature. This book was released on 2020-09-11 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume comprises select papers presented during the Indian Geotechnical Conference 2018. This volume focuses on discussing the many challenges encountered in geoenvironmental engineering. The book covers sustainability aspects related to geotechnical engineering, problematic soils and ground improvement, use of geosynthetics and concepts of soil dynamics. The contents of this book will be useful to researchers and professionals working in geo-environmental engineering and to policy makers interested in understanding geotechnical concerns related to sustainable development.
Download or read book Fly Ash in Concrete written by K. Wesche and published by CRC Press. This book was released on 2004-03-01 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a state-of-the-art report which documents current knowledge on the properties of fly ash in concrete and the use of fly ash in construction. It includes RILEM Recommendations on fly ash in concrete and a comprehensive bibliography including over 800 references.
Download or read book The Deep Mixing Method written by Masaki Kitazume and published by CRC Press. This book was released on 2013-02-21 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Deep Mixing Method (DMM), a deep in-situ soil stabilization technique using cement and/or lime as a stabilizing agent, was developed in Japan and in the Nordic countries independently in the 1970s. Numerous research efforts have been made in these areas investigating properties of treated soil, behavior of DMM improved ground under static and d
Download or read book Geotechnical Applications written by Anirudhan I.V. and published by Springer. This book was released on 2018-06-12 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises select proceedings of the annual conference of the Indian Geotechnical Society. The conference brings together research and case histories on various aspects of geotechnical engineering and geoenvironmental engineering. The book presents papers on geotechnical applications and case histories, covering topics such as (i) shallow and deep foundations; (ii) stability of earth and earth retaining structures; (iii) rock engineering, tunneling, and underground constructions; (iv) forensic investigations and case histories; (v) reliability in geotechnical engineering; and (vi) special topics such as offshore geotechnics, remote sensing and GIS, geotechnical education, codes, and standards. The contents of this book will be of interest to researchers and practicing engineers alike.
Download or read book Sandy Materials in Civil Engineering written by Saeed Nemati and published by BoD – Books on Demand. This book was released on 2020-07-22 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the world moves further into urbanization, there is a greater need for construction materials to meet society’s needs. As natural resources become scarce, the use of recycled materials for construction purposes has become increasingly common. Over the past decade, there has been a significant increase in the utilization of recycled materials in the construction industry. This will result in substantial advantages in structure and infrastructure construction coupled with a reduction in the construction cost, as well as improving sustainability. However, significant development limitations and many relevant considerations must be addressed when using recycled materials in construction. This book introduces innovative and alternative construction materials used in civil engineering.
Download or read book Geoenvironmental Engineering written by Hari D. Sharma and published by John Wiley & Sons. This book was released on 2004-05-20 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geoenvironmental Engineering covers the application of basic geological and hydrological science, including soil and rock mechanics and groundwater hydrology, to any number of different environmental problems. * Includes end-of-chapter summaries, design examples and worked-out numerical problems, and problem questions. * Offers thorough coverage of the role of geotechnical engineering in a wide variety of environmental issues. * Addresses such issues as remediation of in-situ hazardous waste, the monitoring and control of groundwater pollution, and the creation and management of landfills and other above-ground and in-situ waste containment systems.
