Selected Water Resources Abstracts PDF Download

Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 884

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Author: United States. Army. Corps of Engineers
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 120

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Author:
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 230

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Book Description
This study evaluated the impacts of construction on the air content and air-void system structure of Portland cement concrete pavements. The primary intent was to quantify the air content of fresh concrete before and after it has gone through the slipform paver. The air-void system parameters of hardened concrete were then assessed using cast and extracted core specimens. The results of the air content testing on fresh concrete and the concrete cylinder specimens cast in the field suggested that there is some loss of air as the concrete passes through the paver. Laboratory testing performed on cores extracted from the pavement did not provide any conclusive evidence that entrained air is lost during the slipform paving process. In fact, many of the extracted cores had measured air content values that were much higher than the specification requirement. If excessive, this could result in increased permeability and low-strength related issues. Although a rigorous statistical analysis was not performed, the results suggest that the air content testing on fresh concrete is not capturing the true air content of the concrete placed with a slipform paver. The fresh concrete air content is generally lower than the air content measured in the cores.

Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 1424

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Author: Donald J. Janssen
Publisher: Strategic Highway Research Program (Shrp)
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 228

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This study, aimed at improving the freeze-thaw resistance of concrete, consists of three parts. Part I evaluates parameters affecting the freeze-thaw durability of concrete. A modification of the existing standard of method for determining the durability factor of concrete specimens is proposed, and a new procedure for fundamental transverse frequency (used in durability factor calculations) has been developed. Part II focuses on developing better methods for identifying nondurable aggregates, and has resulted in a rapid new test based on the hydraulic fracture of aggregates. Part III describes field experiments to evaluate the freeze-thaw resistance of a number of specified concrete mixes and the use of sealants to mitigate D-cracking. Preliminary field performance results are presented.

Author: Zongjin Li
Publisher: John Wiley & Sons
ISBN: 0470902434
Category : Technology & Engineering
Languages : en
Pages : 698

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Book Description
Over the past two decades concrete has enjoyed a renewed level of research and testing, resulting in the development of many new types of concrete. Through the use of various additives, production techniques and chemical processes, there is now a great degree of control over the properties of specific concretes for a wide range of applications. New theories, models and testing techniques have also been developed to push the envelope of concrete as a building material. There is no current textbook which brings all of these advancements together in a single volume. This book aims to bridge the gap between the traditional concrete technologies and the emerging state-of-the-art technologies which are gaining wider use.

Author: National Stone, Sand & Gravel Association
Publisher:
ISBN: 9780988995000
Category : Aggregate industry
Languages : en
Pages :

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Author: Anjan Kumar Chatterjee
Publisher: CRC Press
ISBN: 1351335731
Category : Technology & Engineering
Languages : en
Pages : 484

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The book is an outcome of the author’s active professional involvement in research, manufacture and consultancy in the field of cement chemistry and process engineering. This multidisciplinary title on cement production technology covers the entire process spectrum of cement production, starting from extraction and winning of natural raw materials to the finished products including the environmental impacts and research trends. The book has an overtone of practice supported by the back-up principles.

Author: Mark Shand
Publisher: Newnes
ISBN: 0123919312
Category : Technology & Engineering
Languages : en
Pages : 336

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Book Description
There is an urgent need for innovative, cost-effective, and sustainable approaches to reduce the tremendous environmental impact of conventional cement and cement-based technologies. Consuming a significantly lower quantity of natural resources than conventional cements, with the added ability to effectively sequestering carbon, magnesia cements offer great potential in this area. Magnesia Cements: From Formulation to Application explores the latest developments in this exciting area, reviewing the unique properties offered by these cements, including superior strength, fire resistance, and exceptional ability to bond to a wide range of aggregates, and highlighting their potential role in making cement production and usage more sustainable. Providing detailed analysis of the chemistry, properties, manufacture, and both traditional and novel applications, Magnesia Cements: From Formulation to Application is ideally suited for materials scientists, cement chemists, ceramicists, and engineers involved with the design, development, application and impact assessment of magnesia cements across both academia and industry. - Provides formulary information research into more environmentally friendly cement systems - Discusses chemical phase analysis and the impact of formulation - Applies analysis and history of global uses to provide support for future environmentally stable industrial, building, and non-building applications

Author: Herbert Insley
Publisher: Elsevier
ISBN: 1483274373
Category : Technology & Engineering
Languages : en
Pages : 301

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Book Description
Microscopy of Ceramics and Cements: Including Glasses, Slags, and Foundry Sands presents the extraordinary value of the microscope in dealing with problems in the manufacture and use of ceramics. This book outlines the methods that are useful in applying polarizing microscope. Organized into 15 chapters, this book begins with an overview of the features of the instruments and of the methods employing them that are appropriate to their use in ceramic research and control laboratories. This text then book surveys the foundation of past experience with the microscope in the several ceramic fields of whitewares, refractories, porcelain enamels, cements, abrasives, foundry sands, and metallurgical slags as a basis for engineering applications and fundamental studies. Other chapters consider the nomenclature employed and interference figures. This book discusses as well the raw materials of ceramics. The final chapter deals with commercially used natural abrasives. This book is a valuable resource for chemists, physicist, and mineralogists.