Evaluation of the Chemical Durability of Iowa Fly Ash Concrete PDF Download
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Author: S. Schlorholtz
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 180
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Book Description
Author: S. Schlorholtz
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 180
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Book Description
Author: Scott Michael Schlorholtz
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 62
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Book Description
The major objective of this research project is to investigate how fly ash influences the chemical durability of portland cement based materials. The testing program is evaluating how Iowa fly ashes influence the sulfate durability of portland cement-fly ash pastes, mortars, and concretes. Also, alkali-reactivity studies are being conducted on mortar bar specimens prepared in accordance with ASTM C311. Preliminary sulfate test results, based only on mortar bar studies, indicate that only the very high-calcium fly ash (29 percent CaO, by weight) consistently reduced the durabiity of test specimens exposed to a solution containing 5 percent sodium sulfate. The remaining four fly ashes that were used in the study showed negligible to dramatic increases in sulfate resistance. Concrete specimens were only beginning to respond to the sulfate solutions after about one year of exposure; and hence, considerably more time will be needed to assess their performance. Preliminary results from the alkali-reactivity tests have indicated that the Oreopolis aggregate is not sensitive to alkali attack. However, some of the test results have indicated that the testing procedure may be prone to delayed expansion due to the presence of periclase (MgO) in the Class C fly ashes. Research is being planned to: (1) verify if the periclase is influencing test results; and (2) estimating the magnitude of the potential error.
Author: Scott Schlorholtz
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 5
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Book Description
The major objective of this research project is to investigate how fly ash influences the chemical durability of portland cement based materials. The testing program is evaluating how Iowa fly ashes influence the sulfate durability of portland cement-fly ash pastes, mortars, and concretes. Also, alkali-reactivity studies are being conducted on mortar bar specimens prepared in accordance with ASTM C311. Preliminary sulfate test results, based only on mortar bar studies, indicate that only the very high-calcium fly ash (29 percent CaO, by weight) consistently reduced the durabiity of test specimens exposed to a solution containing 5 percent sodium sulfate. The remaining four fly ashes that were used in the study showed negligible to dramatic increases in sulfate resistance. Concrete specimens were only beginning to respond to the sulfate solutions after about one year of exposure; and hence, considerably more time will be needed to assess their performance. Preliminary results from the alkali-reactivity tests have indicated that the Oreopolis aggregate is not sensitive to alkali attack. However, some of the test results have indicated that the testing procedure may be prone to delayed expansion due to the presence of periclase (MgO) in the Class C fly ashes. Research is being planned to: (1) verify if the periclase is influencing test results; and (2) estimating the magnitude of the potential error.
Author: Sam G. Moussalli
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 92
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Book Description
Fly ash was used in this evaluation study to replace 15% of the cement in Class C-3 concrete paving mixes.
Author: Mark Allen Dell
Publisher:
ISBN:
Category :
Languages : en
Pages : 246
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Book Description
Author: Robert Leonard Day
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 92
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Book Description
Author:
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 39
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Book Description
Author: Orville D. Ives
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 50
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Book Description
Author: Galen Eugene Morris
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Book Description
Author: R C Joshi
Publisher: CRC Press
ISBN: 9789056995805
Category : Technology & Engineering
Languages : en
Pages : 290
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Book Description
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.
