Evaluation of Fly Ash in Portland Cement Concrete Pavement in Monona County, Iowa PDF Download
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Author: Orville D. Ives
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 50
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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: C. E. Leonard
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 42
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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: Sam G. Moussalli
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
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Author: Vernon J. Marks
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 30
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Book Description
In 1982 the Iowa DOT allowed a successful bidder the option of submitting materials and proportions using fly ash to produce a portland cement concrete (PCC) paving mixture to meet a specified compressive strength. The contractor, Irving F. Jensen, received approval for the use of a concrete mixture utilizing 500 lbs. of portland cement and 88 lbs. of fly ash as a replacement of 88 lbs. of portland cement. The PCC mixture was utilized on the Muscatine County US 61 relocation bypass paved as project F-61-4(32)--20-70. A Class "C" fly ash obtained from the Chillicothe electric generating plant approximately 100 miles away was used in the project. This use of fly ash in lieu of portland cement resulted in a cost savings of $64,500 and an energy savings of approximately 16 billion BTU. The compressive strength of this PCC mixture option was very comparable to concrete mixtures produced without the use of fly ash. The pavement has been performing very well. The substitution of fly ash for 15% of the cement has been allowed as a contractor's option since 1984. Due to the cost savings, it has been used in almost all Iowa PCC paving since that time.
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 488
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Author: Bernard C. Brown
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 28
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Book Description
The data gathered suggests that the present Class C water reduced concrete paving mixes can be modified to allow the substitution of 15% of the cement with an approved fly ash when Class 3 coarse aggregates are used.
Author: Masood Rasoulian
Publisher:
ISBN:
Category : Asphalt concrete
Languages : en
Pages : 136
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Book Description
Author: Michael J. Maloney
Publisher:
ISBN:
Category : Portland cement
Languages : en
Pages : 65
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Book Description
Author: Lawrence L. Sutter
Publisher: Transportation Research Board
ISBN: 0309283558
Category : Political Science
Languages : en
Pages : 91
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Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) 749: Methods for Evaluating Fly Ash for Use in Highway Concrete presents suggested changes to coal fly ash specifications and test protocols contained in American Association of State Highway and Transportation Officials (AASHTO) Standard Specifications for Transportation Materials and Methods of Sampling and Testing (AASHTO M 295). The changes suggested include modifications to the test methods currently specified for evaluating acceptability of fly ash for use in highway concrete as well as the introduction of new test methods for enhancing such evaluations. Attachment C: Details of the Research into Methods for Evaluating Fly Ash Use in Highway Concrete is only available online."--Publisher description.
