Effects of Various Fly Ashes on Compressive Strength, Resistance to Freezing and Thawing, Resistance to Sulfate Attack, and Adiabatic Temperature Rise of Concrete PDF Download
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Author: Kurt F. von Fay
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 68
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Book Description
Author: Kurt F. von Fay
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 68
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Book Description
Author: United States. Bureau of Reclamation
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1034
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Book Description
Author: James T. Dikeou
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 28
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Book Description
Author: F.R. Legg, Jr.
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 856
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Book Description
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 474
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Author: Yancy Schrader
Publisher:
ISBN:
Category :
Languages : en
Pages : 64
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Book Description
Air is purposefully entrained into concrete primarily to improve resistance to freeze-thaw deterioration while saturated with water. Air entraining admixtures (AEAs) are chemical admixtures designed to entrain air into the concrete to provide adequate resistance to the effects of freezing and thawing. One of the challenges associated with air entrainment in concrete is the interaction of an AEA with supplementary cementitious materials present in the concrete, particularly fly ash. Fly ash is a by-product of the coal fired electrical generation industry, and often contains residual unburned carbon and other components that can increase the AEA demand of a particular concrete mix. Properly estimating the amount of AEA required to reach the specified air content in a concrete containing fly ash is of utmost importance to the ready mix concrete supplier, as an insufficient air content may lead to job site rejection and the resultant monetary losses. This study aimed to better relate fly ash and concrete properties obtainable prior to final concrete placement, to direct measures of concrete durability obtainable only after the concrete has set and been put into service. A new device known as the Super Air Meter (SAM) was studied concurrently to better examine the relationship between its System Air Metric number (SAM number) and hardened concrete durability properties. Generally, fly ashes with higher foam index values and surface areas required higher dosages of AEAs to reach a specified air content value. No such relationship could be determined with the more commonly available loss on ignition percentage of the fly ash. The SAM number correctly predicted an acceptable spacing factor in 9 out of 12 different concretes tested, although all of the concretes tested displayed poor performance in freeze-thaw durability. These results demonstrate that air content testing alone is not necessarily sufficient to ensure high quality, durable concrete structures.
Author: Waterways Experiment Station (U.S.)
Publisher:
ISBN:
Category : Aggregates (Building materials).
Languages : en
Pages : 120
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Book Description
Author: Ken Isenberger
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 42
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Book Description
Effect of fly ash class, source and amount on the compressive strength and freeze-thaw durability of fly ash concrete.
