Control of Air Content in Concrete PDF Download

Author: David Whiting
Publisher: Transportation Research Board National Research
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 96

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Author: David Whiting
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 56

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Author: Joseph F. Lamond
Publisher: ASTM International
ISBN: 0803133677
Category : Technology & Engineering
Languages : en
Pages : 661

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Author: American Concrete Institute
Publisher: American Concrete Institute
ISBN: 0870311948
Category : Concrete
Languages : en
Pages : 660

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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: Paul Klieger
Publisher: ASTM International
ISBN: 0803120532
Category : Concrete
Languages : en
Pages : 621

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Author:
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 528

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Book Description

Author: C. H. Best
Publisher: ASTM International
ISBN: 9780803106123
Category : Technology & Engineering
Languages : en
Pages : 886

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Author:
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 875

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Author: V.S. Ramachandran
Publisher: William Andrew
ISBN: 0815516541
Category : Technology & Engineering
Languages : en
Pages : 1183

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Book Description
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.