Download or read book Effectiveness of Fly Ash Replacement in the Reduction of Damage Due to Alkali aggregate Reaction in Concrete written by Josef Farbiarz and published by . This book was released on 1986 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Fly Ash on Concrete Alkali Aggregate Reaction written by ER. Dunstan and published by . This book was released on 1981 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete aggregates may contain reactive constituents that will react with alkalies in cement causing disruptive expansions. Concrete deterioration caused by alkali-aggregate reaction can be prevented by using nonreactive aggregate or using cement with sufficiently low alkali content. However, energy conservation and pollution controls can be expected to indirectly increase the alkali content of some cements. On the other hand, the availability of nonreactive aggregate is continually reduced. Other preventive techniques, such as the use of pozzolan admixtures, can be used. But pozzolans vary in their effectiveness in reducing alkali-aggregate reactions. This paper discusses the use of fly ash pozzolan, a finely divided material collected from the exhaust flues of coal-burning power plants, to reduce alkali-aggregate reaction. The effectiveness of fly ash to reduce this reaction appears to depend, in part, on the chemical composition of the fly ash and also on the percent weight replacement of cement by fly ash.

Download or read book Influence of Alkali Content of Fly Ash on Effectiveness in Preventing Expansion of Concrete written by U.S. Army Engineer Waterways Experiment Station and published by . This book was released on 1963 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Concrete Construction Engineering Handbook written by Edward G. Nawy and published by CRC Press. This book was released on 2008-06-24 with total page 1586 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Concrete Construction Engineering Handbook, Second Edition provides in depth coverage of concrete construction engineering and technology. It features state-of-the-art discussions on what design engineers and constructors need to know about concrete, focusing on - The latest advances in engineered concrete materials Reinforced concrete construction Specialized construction techniques Design recommendations for high performance With the newly revised edition of this essential handbook, designers, constructors, educators, and field personnel will learn how to produce the best and most durably engineered constructed facilities.

Download or read book Alkali Aggregate Reaction written by K. Okada and published by CRC Press. This book was released on 2004-01-14 with total page 923 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 8th International Conference on Alkali-Aggregate Reaction held in Kyoto, Japan, 17-20 July 1989.

Download or read book The Effects of Fly Ash and Silica Fume on Alkali silica Reaction in Concrete written by Medhat H. Shehata and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of silica fume and fly ash on reducing the risk of concrete damage due to alkali-silica reaction are presented in this thesis. One silica fume and twenty fly ashes of a wide range of chemical composition were investigated. The effect of the selected materials on expansion when used with high-alkali Portland cement and a siliceous limestone reactive aggregate (Spratt) was evaluated using the concrete prism and the accelerated mortar bar tests. Portland cement pastes and lime/pozzolan blends were prepared using similar combinations of materials used in the expansion tests. These samples were used to study the effects of fly ash and silica fume on the pore solution alkalinity and composition of hydration products. The study showed that the efficiency of fly ash in limiting the risk of deleterious expansion is linked to its efficiency in lowering the pore solution alkalinity. High-calcium and high-alkali fly ashes are generally less effective in this respect compared to low-calcium ash. Silica fume was found to be effective in reducing the pore solution alkalinity at early ages; however, the alkalinity was found to increase at ages later than 28 days. Combinations of moderate levels of silica fume (5%) and high-calcium fly ash (20-30%) were found to be effective in limiting the expansion even after three years. This was attributable to the high capacity of such combinations to achieve and maintain low pore solution alkalinity. The silica fume reduces the pore solution alkalinity at early ages and the fly ash maintained the low alkalinity at later ages. The study showed that, for low and moderate-alkali fly ash, the 14-day expansion in the accelerated mortar bar test could be used to predict the 2-year expansion of concrete prisms. The results from the lime/pozzolan blends confirmed that the hydration products of pozzolan play the dominant role in reducing the pore solution alkalinity of cementitious systems containing pozzolans. The two-year expansion of concrete prisms containing fly ash could be correlated reliably to the alkalis available from the ash as determined by leaching mature paste samples in leaching solution of alkali ion concentration of 0.25 moles per litre.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1987 with total page 1060 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thougtit that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 31 (thesis year 1986) a total of 11 ,480 theses titles trom 24 Canadian and 182 United States universities. We are sure that this broader base tor these titles reported will greatly enhance the value ot this important annual reterence work. While Volume 31 reports theses submitted in 1986, on occasion, certain univer sities do re port theses submitted in previousyears but not reported at the time.

Download or read book Cement Replacement Materials written by Ali Akbar Ramezanianpour and published by Springer Science & Business Media. This book was released on 2013-09-24 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this book is to present the latest findings in the properties and application of Supplementary Cementing Materials and blended cements currently used in the world in concrete. Sustainability is an important issue all over the world. Carbon dioxide emission has been a serious problem in the world due to the greenhouse effect. Today many countries agreed to reduce the emission of CO2. Many phases of cement and concrete technology can affect sustainability. Cement and concrete industry is responsible for the production of 7% carbon dioxide of the total world CO2 emission. The use of supplementary cementing materials (SCM), design of concrete mixtures with optimum content of cement and enhancement of concrete durability are the main issues towards sustainability in concrete industry.

Download or read book Concrete Alkali aggregate Reactions written by Patrick E. Grattan-Bellew and published by William Andrew. This book was released on 1987 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Waste Materials and By Products in Concrete written by Rafat Siddique and published by Springer Science & Business Media. This book was released on 2007-11-13 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: The amount and variety of waste that humanity dumps in landfill sites is nothing short of a scandal, believes Rafat Siddique, of Deemed University in Patiala, India. Instead, we ought to be building new homes out of it! Siddique shows in this important book that many non-hazardous waste materials and by-products which are landfilled, can in fact be used in making concrete and similar construction materials.

Download or read book Effectiveness of Fly Ash in Reducing Expansions Due to the Alkali silica Reaction written by Curtis L. Ensley and published by . This book was released on 1995 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fly Ash in Concrete written by R C Joshi and published by CRC Press. This book was released on 1997-11-13 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since it was first recognized as a mineral admixture for concrete in the 1930's, fly ash has been the subject of worldwide study as researchers work to maximize its economical and environmental benefits. In recent years, investigations have focused on the physical, chemical and mineralogical characteristics of fly ash and their specific correlation to the performance of concrete. This book collects the latest results from these various studies and offers a complete review of the advantages of fly ash as an admixture in concrete, including strength development and improved chemical resistance and durability. A review of the current international standards on fly ash usage is provided, in addition to an extensive reference list and a complete survey of various other fly ash products, such as bricks, mineral wool and gypsum wall boards, as well as the use of fly ash in waste management.

Download or read book Supplementary Cementing Materials written by Rafat Siddique and published by Springer Science & Business Media. This book was released on 2011-03-28 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an attempt to consolidate the published research related to the use of Supplementary Cementing Materials in cement and concrete. It comprises of five chapters. Each chapter is devoted to a particular supplementing cementing material. It is based on the literature/research findings published in journals/conference proceeding, etc. Topics covered in the book are; coal fly ash, silica fume (SF), granulated blast furnace slag (GGBS), metakaolin (MK), and rice husk ash (RHA). Each chapter contains introduction, properties of the waste material/by-product, its potential usage, and its effect on the properties of fresh and hardened concrete and other cement based materials.

Download or read book State of the art Report on the Mechanism of Alkali aggregate Reaction in Concrete Containing Fly Ash written by David C. Schuman and published by . This book was released on 1988 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Use of Fly Ash in the Mitigation of Alkali silica Reaction in Concrete written by Kelsea Schwing and published by . This book was released on 2010 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alkali-silica reaction (ASR) is one of the leading causes of concrete deterioration throughout the world, and affects both structural and non-structural elements. Despite strong research efforts since its discovery by Stanton in the late 1930s, this deteriorating reaction is still not clearly understood nor are proper preventative measures effectively applied to reduce the risk of ASR. Central to the debate is a lack of clear understanding about how supplementary cementing materials (SCMs), in particular fly ash, limit the progression of the reaction. One reason for avoiding the use of a certain fly ash in concrete is the alkali content of the particular fly ash. Because there is very little guidance and no standardized test to accurately measure the contribution of alkalies from a given ash in a real concrete mixture, many ashes are simply avoided. Development and standardization of a rapid test method to accurately predict the contribution of fly ash alkalies to the pore solution of concrete is the goal of a multi-phase project in the Civil Engineering department at Oregon State University. The first phase of the project included performing a series of ASTM C 1567 tests (Standard Test Method for Potential Reactivity of Aggregates (Mortar-Bar Method)) utilizing various materials and replacement levels to determine the effectiveness of different fly ashes in the mitigation of ASR expansion. Also, predictive equations introduced by Malvar et al were applied to a variety of materials to determine the efficacy of different fly ashes to control alkali silica reaction based on chemical composition. In addition, pore solution evaluation was conducted using a specialized extraction device, one of only 3 of its kind in the United States. This process, carried out on 265 paste samples made of various combinations of cements, fly ashes and fly ash replacement levels, enabled the authors to evaluate the effects of curing temperature, time and raw material chemistry on the paste pore solution. The results of the pore solution analysis were compared against the expansion tests and it was concluded that aluminum also plays a key role in the ability of a given ash to mitigate alkali-silica reaction.