Freeze-thaw Resistance and Air-void System of Iowa Fly Ash Concretes PDF Download
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Author: Randolph Jay Allenstein
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Author: Randolph Jay Allenstein
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Author: Chengsheng Ouyang
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 70
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Book Description
The freeze-thaw resistance of concretes was studied. Nine concrete mixes, made with five cements and cement-Class C fly ash combinations, were exposed to freeze-thaw cycling following 110 to 222 days of moist curing. Prior to the freeze-thaw cycling, the specimens were examined by a low-vacuum scanning electron microscope (SEN) for their microstructure. The influcence of a wet/dry treatment was also studied. Infilling of ettringite in entrained air voids was observed in the concretes tested. The extent of the infilling depends on the period of moist curing as well as the wet/dry treatment. The concretes with 15% Class C fly ash replacement show more infilling in their air voids. It was found that the influence of the infilling on the freeze-thaw durability relates to the air spacing factor. The greater the spacing factor, the more expansion under the freeze-thaw cycling. The infilling seems to decrease effective air content and to increase effective spacing factor. The infilling also implies that the filled air voids are water-accessible. These might lead to concrete more vulnerable to the freeze-thaw attack. By combining the above results with field observations, one may conclude that the freeze-thaw damage is a factor related to premature deterioration of PCC pavements in Iowa.
Author: Thomas Duane Larson
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 416
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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.
Author: Steven M. Cramer
Publisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 50
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Book Description
Author: Zeyad Taha Zayed
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 104
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Author:
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 52
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Author: R Auberg
Publisher: CRC Press
ISBN: 0203627326
Category : Architecture
Languages : en
Pages : 400
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Book Description
This book forms the proceedings of the international workshop to be held in Essen, Germany. This workshop summarises the conclusion of the technical committee's investigations into the resistance of concrete to freeze-thaw attack, specific in this to resistance with or without de-icing chemicals. It presents the RILEM recommendations on testing the freeze-thaw and de-icing salt resistance of concrete.
Author: Chengsheng Ouyang
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 48
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Book Description
Author: Robert Andrew Carnazzo
Publisher:
ISBN:
Category :
Languages : en
Pages : 146
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