Cement and Concrete Mineral Admixtures

Cement and Concrete Mineral Admixtures

This comprehensive reference for senior undergraduate and graduate engineering students in cement and concrete and for cement and concrete practitioners covers a wide range of mineral admixtures.

Author: Mustafa Tokyay

Publisher: CRC Press

ISBN: 036702800X

Category: Concrete

Page: 318

View: 581

Supplementary cementing materials and other mineral admixtures are being used in increasing amounts in both cement and concrete. Their main technical benefits are that they enhance the workability of fresh concrete and the durability of hardened concrete. Indeed, they affect almost every property of the concrete. Their economic and ecological benefits may be just as significant, and their use can be expected to increase as concrete remains the most common construction material. Cement and Concrete Mineral Admixtures concentrates mostly on natural pozzolans, fly ashes, ground granulated blast furnace slag, silica fume and limestone powder, namely the most commonly used mineral admixtures. Others such as metakaolin, rice husk ash, expanded clays and shales are also discussed. Their chemical, mineralogical, and physical properties are outlined. The influence of mineral admixtures on the hydration of cementitious systems, and the properties of fresh and hardened concrete in which they are used are emphasized. International standards are reviewed. The basics of concrete mix proportioning with mineral admixtures are outlined. The possibilities of using mineral admixtures as constituents of special concretes such as self-compacting, reactive powder, roller-compacted concretes and special non-portland, low-cost, low-energy and/or low-CO2 cements such as alinite, calcium sulfoaluminate, and belitic cements and alkali-activated binders are also covered. The book is a comprehensive reference for senior undergraduate and graduate students and researchers in the fields of cement and concrete, and for cement and concrete practitioners.
Categories: Concrete

Mineral Admixtures in Cement and Concrete

Mineral Admixtures in Cement and Concrete

reinforcing steel in concrete [170] The research evaluated four accelerated test procedures: (a) accelerated chloride test (ACT), (b) rapid macrocell test, (c) chloride ion threshold test, and (d) modified ASTM G109 test [171] The ...

Author: Jayant D. Bapat

Publisher: CRC Press

ISBN: 9781439817933

Category: Technology & Engineering

Page: 310

View: 898

Written to meet the requirements of engineers working in construction and concrete manufacturing, Mineral Admixtures in Cement and Concrete focuses on how to make more workable and durable concrete using mineral admixtures. In particular, it covers pulverized fuel ash (PFA), blast furnace slag (BFS), silica fume (SF), rice husk ash (RHA), and metak
Categories: Technology & Engineering

Cement and Concrete Mineral Admixtures

Cement and Concrete Mineral Admixtures

11 Effects of mineral admixtures on durability of concrete 159 12 13 11.1 Freezing and thawing 159 11.2 11.3 11.4 11.5 11.6 11.7 11.1.1 The frost attack mechanism 160 11.1.1.1 Hydraulic pressure theory 160 11.1.1.2 Osmotic pressure ...

Author: Mustafa Tokyay

Publisher: CRC Press

ISBN: 9781498716550

Category: Technology & Engineering

Page: 318

View: 899

Supplementary cementing materials and other mineral admixtures are being used in increasing amounts in both cement and concrete. Their main technical benefits are that they enhance the workability of fresh concrete and the durability of hardened concrete. Indeed, they affect almost every property of the concrete. Their economic and ecological benefits may be just as significant, and their use can be expected to increase as concrete remains the most common construction material. Cement and Concrete Mineral Admixtures concentrates mostly on natural pozzolans, fly ashes, ground granulated blast furnace slag, silica fume and limestone powder, namely the most commonly used mineral admixtures. Others such as metakaolin, rice husk ash, expanded clays and shales are also discussed. Their chemical, mineralogical, and physical properties are outlined. The influence of mineral admixtures on the hydration of cementitious systems, and the properties of fresh and hardened concrete in which they are used are emphasized. International standards are reviewed. The basics of concrete mix proportioning with mineral admixtures are outlined. The possibilities of using mineral admixtures as constituents of special concretes such as self-compacting, reactive powder, roller-compacted concretes and special non-portland, low-cost, low-energy and/or low-CO2 cements such as alinite, calcium sulfoaluminate, and belitic cements and alkali-activated binders are also covered. The book is a comprehensive reference for senior undergraduate and graduate students and researchers in the fields of cement and concrete, and for cement and concrete practitioners.
Categories: Technology & Engineering

Mineral Admixtures in Cement and Concrete

Mineral Admixtures in Cement and Concrete

This book is a useful reference for practicing engineers and students alike. It brings together, in one volume, information on the materials, hydration, and the strength and durability of cement and concrete with mineral admixtures.

Author: Jayant D. Bapat

Publisher: CRC Press

ISBN: 9781439817926

Category: Technology & Engineering

Page: 315

View: 475

Written to meet the requirements of engineers working in construction and concrete manufacturing, Mineral Admixtures in Cement and Concrete focuses on how to make more workable and durable concrete using mineral admixtures. In particular, it covers pulverized fuel ash (PFA), blast furnace slag (BFS), silica fume (SF), rice husk ash (RHA), and metakaolin (MK), as well as some new admixtures currently under investigation. For each mineral admixture, the book looks at manufacturing and processing, physical characteristics, chemical and mineralogical composition, quality control, and reported experiences. It also examines the provisions of national standards on the admixture’s addition to cement and concrete. References to microstructures and chemistry are kept to a minimum and only discussed to the extent necessary to help readers apply the admixtures in practice. The book also addresses hydration, presenting the relevant chemistry and detailing the impact of adding mineral admixtures to concrete. A chapter on strength and durability explains the mechanisms, models, and standards related to concrete deterioration and how to mitigate carbonation, alkali-aggregate reactions, chloride attack and corrosion of reinforcement, external and internal sulphate attack, decalcification, and freeze-thaw action. This book is a useful reference for practicing engineers and students alike. It brings together, in one volume, information on the materials, hydration, and the strength and durability of cement and concrete with mineral admixtures. Offering a deeper understanding of mineral admixtures, it encourages engineers to more effectively use these and other wastes in cement and concrete to support more sustainable growth of the cement and construction industry.
Categories: Technology & Engineering

Metakaolin and Fly Ash as Mineral Admixtures for Concrete

Metakaolin and Fly Ash as Mineral Admixtures for Concrete

The book deals with modern theoretical concepts related to the impact of fly ash and metakaolin admixtures on structure formation processes of concrete.

Author: Leonid Dvorkin

Publisher: CRC Press

ISBN: 9781000477443

Category: Science

Page: 248

View: 822

The book deals with modern theoretical concepts related to the impact of fly ash and metakaolin admixtures on structure formation processes of concrete. Results of the effect of fly ash, metakaolin and their composition on properties of self-compacting and self-leveling concrete are presented. Based on mathematical models, obtained using mathematical experiments planning methodology, the impact of the main factors and their combination on workability, strength and other properties that determine efficiency and durability of concrete are analyzed. Using calculated dependencies, a methodology for designing optimal compositions of concrete containing active mineral admixtures and superplasticizers is proposed. Features of industrial production of concrete for the proposed compositions are discussed. The book is intended for specialists working in the production of concrete and reinforced concrete products and elements. It can also be used by construction engineers to design compositions of cost-effective self-compacting and self-leveling concrete as well as to determine the rational direction of using technogenic raw materials like ash and metakaolin.
Categories: Science

Concrete Admixtures Handbook 2nd Ed

Concrete Admixtures Handbook  2nd Ed

Addition of mineral admixtures, particularly finely divided pozzolanic and cementitious materials, can affect the properties of cement mortar/concrete both in fresh and hardened state. In fresh or plastic state, mix proportions, ...

Author: V.S. Ramachandran

Publisher: William Andrew

ISBN: 9780815516545

Category: Technology & Engineering

Page: 1183

View: 799

Since the publication of the first edition ten years ago, significant developments have occurred in the use of admixtures in concrete. Eight new chapters and a full update of the preceding ten chapters bring this book up to date; reflecting the relative advances made in the science and technology of different groups of admixtures. The increased role and development of admixtures in concrete technology is evidenced by a number of conferences, publications, and novel admixtures available in the market place. These developments in the field caused the modification of many chapters in the first edition in order to reflect the advances. Although individual chapters refer to standards and specifications of admixtures, those only interested in the standards or techniques used in investigating admixtures will find the second chapter (Research Technologies, Standards, and Specifications) useful. Admixtures are not as inert as may be presumed. They may chemically interact with the constituents of concrete and affect the properties of the fresh and hardened concrete and its durability. The third chapter deals with these aspects. It was important to devote a chapter to recent attempts in developing new admixtures.
Categories: Technology & Engineering

Fly Ash in Concrete

Fly Ash in Concrete

... in cement mortar / concrete . Because of the reported difficulty in evaluating degree of pozzolanic activity , most organizations do not even identify fly ash as pozzolanic admixture but as mineral admixture in cement con- crete .

Author: R C Joshi

Publisher: CRC Press

ISBN: 9056995804

Category: Technology & Engineering

Page: 290

View: 822

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.
Categories: Technology & Engineering

Building Construction and Structural Systems

Building Construction and Structural Systems

1.9 Admixtures Admixture is defined as a material, other than normal constituents (i.e., cement, aggregates, ... The other, equally important, objectives for using mineral admixtures in cement concrete include economic benefits and ...

Author: Rajesh Kumar R

Publisher: Jyothis Publishers

ISBN: 9789354085772

Category: Technology & Engineering

Page: 179

View: 194

Categories: Technology & Engineering