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Author : Cenġiz Duran Aṫiş
Publisher :
ISBN 13 :
Total Pages : 684 pages
Book Rating : 4.:/5 (118 download)
Download or read book Design and Properties of High Volume Fly Ash Concrete for Pavements written by Cenġiz Duran Aṫiş and published by . This book was released on 1997 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)
Download or read book High-volume Fly Ash Concrete for Pavements Findings: Volume 1 written by and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-volume fly ash concrete (HVFAC) has improved durability and sustainability properties at a lower cost than conventional concrete, but its early-age properties like strength gain, setting time, and air entrainment can present challenges for application to concrete pavements. This research report helps with the implementation of HVFAC for pavement applications by providing guidelines for HVFAC mix design, testing protocols, and new tools for better quality control of HVFAC properties. Calorimeter tests were performed to evaluate the effects of fly ash sources, cement-fly ash interactions, chemical admixtures, and limestone replacement on the setting times and hydration reaction of HVFAC. To better target the initial air-entraining agent dosage for HVFAC, a calibration curve between air-entraining dosage for achieving 6% air content and fly ash foam index test has been developed. Further, a digital foam index test was developed to make this test more consistent across different labs and operators. For a more rapid prediction of hardened HVFAC properties, such as compressive strength, resistivity, and diffusion coefficient, an oxide-based particle model was developed. An HVFAC field test section was also constructed to demonstrate the implementation of a noncontact ultrasonic device for determining the final set time and ideal time to initiate saw cutting. Additionally, a maturity method was successfully implemented that estimates the in-place compressive strength of HVFAC through wireless thermal sensors. An HVFAC mix design procedure using the tools developed in this project such as the calorimeter test, foam index test, and particle-based model was proposed to assist engineers in implementing HVFAC pavements.
Author : Ahmad Fuzail Hashmi
Publisher :
ISBN 13 : 9785032986553
Total Pages : 0 pages
Book Rating : 4.9/5 (865 download)
Download or read book High Volume Fly Ash Concrete Behavior in Structural Design written by Ahmad Fuzail Hashmi and published by . This book was released on 2023-03-13 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: High Volume Fly Ash Concrete (HVFA) is a type of concrete that incorporates a large volume of fly ash as a partial replacement for Portland cement. Fly ash is a by-product of coal combustion that is collected from power plants, and it has pozzolanic properties that can enhance the durability, workability, and strength of concrete. In HVFA, the replacement of Portland cement with fly ash typically ranges from 50% to 70% by mass, resulting in a reduction in the amount of cement required and a decrease in the carbon footprint of the concrete. However, this high volume of fly ash can also affect the behavior of the concrete in structural design. One of the main challenges in designing with HVFA concrete is the potential for delayed strength development. Fly ash reacts slowly with water, and this can result in a longer period for the concrete to reach its desired strength. This delayed strength development must be taken into account in the design process to ensure that the concrete can support the intended loads. Additionally, the use of HVFA can also affect the workability and setting time of the concrete. The high amount of fly ash can make the mixtures more viscous and harder to place, and it can also result in longer setting times. This can impact the construction schedule and require adjustments to be made in the mix design and placement procedures. On the other hand, HVFA can also provide benefits in structural design. The lower heat of hydration and reduced shrinkage characteristics of HVFA can minimize the potential for cracking and improve the long-term durability of the concrete. Furthermore, the use of fly ash can contribute to the overall sustainability of the project by reducing the carbon footprint and diverting waste from landfills. Overall, the behavior of HVFA concrete in structural design requires careful consideration of its unique properties and potential challenges. With proper mix design and construction practices, HVFA can provide a durable and sustainable option for concrete structures.
Author : V. Mohan Malhotra
Publisher :
ISBN 13 : 9780973150728
Total Pages : 120 pages
Book Rating : 4.1/5 (57 download)
Download or read book High-performance, High-volume Fly Ash Concrete written by V. Mohan Malhotra and published by . This book was released on 2005 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dale P. Bentz
Publisher : CreateSpace
ISBN 13 : 9781500312497
Total Pages : 64 pages
Book Rating : 4.3/5 (124 download)
Download or read book Best Practices Guide for High-volume Fly Ash Concretes written by Dale P. Bentz and published by CreateSpace. This book was released on 2014-06-24 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: A best practices guide is developed from a synthesis of recent research on high-volume fly ash (HVFA) concrete mixtures. These best practices can be applied by the concrete construction industry to achieve desired properties and to ensure the (high) performance of HVFA concrete mixtures in practice. As such, the report considers all aspects of HVFA concrete production, from the characterization of the starting materials, through mixture proportioning and curing options to achieve desired properties, to the in-place early-age and long-term performance of the concrete in its fresh and hardened states. Both mechanical and transport properties are considered in detail. Perspective is established based on a brief review of current practices being employed nationally. Each topical section is concluded with a practice-based set of recommendations for the design and construction community. The report is intended to serve as a valuable resource to these communities, providing both a research summary and a guide to practical steps that can be taken to achieve the optimum performance of these sustainable concrete mixtures.
Author : K. Wesche
Publisher : CRC Press
ISBN 13 : 0203626419
Total Pages : 298 pages
Book Rating : 4.2/5 (36 download)
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.
Author : Aniruddha Baral
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)
Download or read book Early-age Properties of High-volume Fly Ash Concrete Mixes for Pavement: Volume 2 written by Aniruddha Baral and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-volume fly ash concrete (HVFAC) is more cost-efficient, sustainable, and durable than conventional concrete. This report presents a state-of-the-art review of HVFAC properties and different fly ash characterization methods. The main challenges identified for HVFAC for pavements are its early-age properties such as air entrainment, setting time, and strength gain, which are the focus of this research. Five fly ash sources in Illinois have been repeatedly characterized through x-ray diffraction, x-ray fluorescence, and laser diffraction over time. The fly ash oxide compositions from the same source but different quarterly samples were overall consistent with most variations observed in SO3 and MgO content. The minerals present in various fly ash sources were similar over multiple quarters, with the mineral content varying. The types of carbon present in the fly ash were also characterized through x-ray photoelectron spectroscopy, loss on ignition, and foam index tests. A new computer vision-based digital foam index test was developed to automatically capture and quantify a video of the foam layer for better operator and laboratory reliability. The heat of hydration and setting times of HVFAC mixes for different cement and fly ash sources as well as chemical admixtures were investigated using an isothermal calorimeter. Class C HVFAC mixes had a higher sulfate imbalance than Class F mixes. The addition of chemical admixtures (both PCE- and lignosulfonate-based) delayed the hydration, with the delay higher for the PCE-based admixture. Both micro- and nano-limestone replacement were successful in accelerating the setting times, with nano-limestone being more effective than micro-limestone. A field test section constructed of HVFAC showed the feasibility and importance of using the noncontact ultrasound device to measure the final setting time as well as determine the saw-cutting time. Moreover, field implementation of the maturity method based on wireless thermal...
Author : Vute Sirivivatnanon
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (681 download)
Download or read book Development of High Volume Fly Ash Concrete in Australia written by Vute Sirivivatnanon and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes the development of high volume fly ash (HVFA) concrete for structural concrete and pavements. Trials carried out at Pacific Power's Mount Piper Power Station project in New South Wales is also described. Concretes with high fly ash content (40% and above by weight of the total binder fractions) were designed for structural grades. The workability, mechanical and long-term volume stability properties were evaluated. It was found that HVFA concrete could be designed having fresh concrete properties similar to plain cement concrete with the exception of setting times. HVFA concretes with characteristic compressive strength up to 5O MPa could be produced. For concretes of similar strength grades, it was found that the flexural strength and elastic modulus properties of HVFA concretes were similar to plain cement concretes. HVFA concretes were found to have similar or lower drying shrinkage at 56 days when compared to companion plain cement concretes of equivalent grades. Creep strains were also improved significantly in HVFA concretes. The setting times were increased by one to SLY hours depending on the type of cement and percentage of fly ash used. The concretes also developed considerable strength after 24 hours to withstand loading from normal construction activities. Trial production and placing of these concretes for apron slabs and road pavements was carried out at the Pacific Power's Mount Piper Power Station. It was found that HVFA concrete could be produced and placed successfully through normal concreting practices including pumping. A 5 to 6% air content could also be entrained with normal air entraining agent. The finished pavement looked similar to that placed using conventional concrete. While severe retardation in setting was found in the last two trials, it was subsequently found that it was caused by the incompatibility between the water reducing agent and the binder system. Long-term performance of these concretes are being monitored.
Author : National Institute of Standards and Technology
Publisher : CreateSpace
ISBN 13 : 9781496030337
Total Pages : 70 pages
Book Rating : 4.0/5 (33 download)
Download or read book Best Practices Guide for High-Volume Fly Ash Concretes written by National Institute of Standards and Technology and published by CreateSpace. This book was released on 2014-02 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: A best practices guide is developed from a synthesis of recent research on high-volume fly ash (HVFA) concrete mixtures. These best practices can be applied by the concrete construction industry to achieve desired properties and ensure the (high) performance of HVFA concrete mixtures in practice. As such, the report considers all aspects of HVFA concrete production, from the characterization of the starting materials, through mixture proportioning and curing options to achieve desired properties, to the in-place early-age and long term performance of the concrete in its fresh and hardened states. Both mechanical and transport properties are considered in detail. Perspective is established based on a brief review of current practices being employed nationally. Each topical section is concluded with a practice-based set of take away messages for the design and construction community. The report is intended to serve as a valuable resource to these communities, providing both a research summary and a guide to practical steps that can be taken to achieve the optimum performance of these sustainable concrete mixtures.
Author : Dr. SS. Asadi & Dr. Vennam Swathi
Publisher : Laxmi Book Publication
ISBN 13 : 1304796221
Total Pages : 107 pages
Book Rating : 4.3/5 (47 download)
Download or read book INCEPTION OF HIGH-VOLUME FLY ASH WITH HYBRID FIBRE BASED CONCRETE : A PERFORMER written by Dr. SS. Asadi & Dr. Vennam Swathi and published by Laxmi Book Publication. This book was released on 2024-01-20 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: When infrastructure is built quickly, development occurs. Concrete is the go-to material for construction projects. Manufacturing cement is a significant contributor to atmospheric carbon dioxide. Using carbon-neutral materials like crimson mud or powdered snail shells can reduce cement's carbon dioxide emissions by half. As an adaptable alternative to traditional concrete, HVFA concrete has many uses. Long-lasting and useful in Plain Cement Concrete (PCC) projects, fly ash also enhances concrete's workability. The positive effects of fly ash on the environment, such as lower carbon dioxide emissions, are not new. Adding fly ash to concrete increases its strength and segregation, which reduces its price and makes it simpler to pump.
Author : V. M. Malhotra
Publisher :
ISBN 13 :
Total Pages : 101 pages
Book Rating : 4.:/5 (112 download)
Download or read book High-performance, high-volume fly ash concrete written by V. M. Malhotra and published by . This book was released on 2002 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hsien-Hsin Hung
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (594 download)
Download or read book Properties of High Volume Fly Ash Concrete written by Hsien-Hsin Hung and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 29 pages
Book Rating : 4.:/5 (185 download)
Download or read book Use of Fly Ash in Concrete written by and published by . This book was released on 1989 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kris Zacny
Publisher : Amer Society of Civil Engineers
ISBN 13 : 9780784412190
Total Pages : 599 pages
Book Rating : 4.4/5 (121 download)
Download or read book Earth and Space 2012 written by Kris Zacny and published by Amer Society of Civil Engineers. This book was released on 2012 with total page 599 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Vute Sirivivatnanon
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (681 download)
Download or read book Applications of High Volume Fly Ash Concretes written by Vute Sirivivatnanon and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: While the use of small proportion of fly ash in the binder of concrete is well understood and accepted in many countries, the technology relating to the use of high volume (40% by weight or more of binder) of fly ash in structural concrete is a more recent development. This paper discusses the development of high volume fly ash (HVFA) concrete in Australia and overseas with specific emphasis on its potential applications. Mix design method and data are described. It has been found that HVFA concrete can be designed within the constraints of the present Australian code of practice to give equivalent 28 day compressive strength to plain cement concrete. However, the volume stability and durability properties of HVFA concretes have been found to be significantly better than the equivalent plain cement concrete. With its inherent increased cohesiveness and long term properties, potential applications are identified and discussed with respect to the specific properties.
Author : H. T. Cao
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (681 download)
Download or read book Properties and Applications of High Volume Fly Ash Concretes written by H. T. Cao and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural grade concretes with high volume of fly ash (HVFA) have been developed in Australia since 1991. These are concretes with fly ash making up to 50 percent by weight of the total binder. In this paper, mix design method and mix design data for HVFA concretes and their mechanical properties are given. The advantages of HVFA concretes in terms of improved volume stability and durability compared with portland cement concretes of equivalent 28-day compressive strength are discussed. The suitability of these type of concretes are highlighted with respect to their properties and construction demands. Example of applications in Australia and overseas are given.
Author : W.F. Chen
Publisher : CRC Press
ISBN 13 : 1420041215
Total Pages : 2898 pages
Book Rating : 4.4/5 (2 download)
Download or read book The Civil Engineering Handbook written by W.F. Chen and published by CRC Press. This book was released on 2002-08-29 with total page 2898 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1995, the award-winning Civil Engineering Handbook soon became known as the field's definitive reference. To retain its standing as a complete, authoritative resource, the editors have incorporated into this edition the many changes in techniques, tools, and materials that over the last seven years have found their way into civil
