Evaluation of Fly Ash Concrete Durability Containing Class II Durability Aggregates PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Evaluation of Fly Ash Concrete Durability Containing Class II Durability Aggregates PDF full book. Access full book title Evaluation of Fly Ash Concrete Durability Containing Class II Durability Aggregates by Sam G. Moussalli. Download full books in PDF and EPUB format.
Author: Sam G. Moussalli
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 92
Get Book Here
Book Description
Fly ash was used in this evaluation study to replace 15% of the cement in Class C-3 concrete paving mixes.
Author: Sam G. Moussalli
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 92
Get Book Here
Book Description
Fly ash was used in this evaluation study to replace 15% of the cement in Class C-3 concrete paving mixes.
Author: Scott Schlorholtz
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 5
Get Book Here
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: Ken Isenberger
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 42
Get Book Here
Book Description
Effect of fly ash class, source and amount on the compressive strength and freeze-thaw durability of fly ash concrete.
Author: S. Schlorholtz
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 180
Get Book Here
Book Description
Author: K. Wesche
Publisher: CRC Press
ISBN: 0203626419
Category : Architecture
Languages : en
Pages : 298
Get Book Here
Book Description
This book is a state-of-the-art report which documents current knowledge on the properties of fly ash in concrete and the use of fly ash in construction. It includes RILEM Recommendations on fly ash in concrete and a comprehensive bibliography including over 800 references.
Author: Bernard C. Brown
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 28
Get Book Here
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: E. E. Berry
Publisher: Energy, Mines and Resources Canada : CANMET, Canadian Centre for Mineral and Energy Technology
ISBN:
Category : Concrete
Languages : en
Pages : 206
Get Book Here
Book Description
This volume presents a state-of-the-art review of the principaladvances in research, development, and practical application offly ash in concrete that have been made during the period 1976to 1984. Recommendations are made with regard to aspects of flyash concrete technology requiring further research.
Author: Daniel Stephen Lane
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 18
Get Book Here
Book Description
Cores from 36 bridge decks were evaluated to assess the condition and quality of the concrete by petrographic methods and direct and indirect measures of the transport properties. Transport properties were measured by a rate of absorption test (ASTM C 1585) and by electrical conductance using the rapid chloride permeability apparatus (ASTM C 1202). The decks were distributed across Virginia to reflect the varied geographic and climatic regions. Two bridge age groups, each constructed under different specifications, were represented: (1) from 1968 through 1971, where portland cement concrete with a maximum specified water-cementitious material ratio (W/C) of 0.47 was used with uncoated reinforcing steel; and (2) from 1984 through 1991, where the specification required a maximum W/CM of 0.45, required epoxy-coated reinforcement, and allowed the use of fly ash or ground slag as supplementary cementitious materials. The older group included 10 decks, and the younger included 26. In the younger group, 8 were identified as containing fly ash and 7 were identified as containing slag. Five of the concretes exhibited excessively high spacing factors, suggesting susceptibility to freezing and thawing damage, although only two showed signs of such damage. Four of the decks exhibited excessively small spacing factors that could significantly affect strength. Signs of poor paste quality attributable to excessive water were noted in approximately one-third of the concretes. Cracking was of significance in 12 decks but was limited to paste cracking in 6; of these, 5 contained either fly ash or slag. Four showed signs of damage related to alkali-aggregate reactions, including 3 with carbonate rocks, 1 of which contained slag. A general assessment based on petrographic observations showed a fairly even distribution of good, fair, and poor ratings. Fly ash and slag concretes tended to have initial rates of absorption in the lower third, often despite their petrographic rating, suggesting they are providing beneficial reductions in transport properties in field concretes. The secondary (longer term) rate of absorption related better with the petrographic ratings, and the fly ash and slag concretes again tended to have lower rates. Of the fly ash and slag concretes exhibiting paste cracking, only one consistently had high absorption rates. In contrast to the rate of absorption results, the electrical conductivity results suggested little differences between the concretes, raising questions about its usefulness in evaluating mature field concretes. This study demonstrates the beneficial contributions that fly ash and ground slag as supplementary cementitious materials provide to concrete durability, and they should continue to be used as an integral part of efforts to increase the service life of concrete structures. ASTM C 1585 provides a direct measure of the transport properties of concrete and should be incorporated into both the concrete materials acceptance and asset evaluation and management programs.
Author: Abla M. Zayed
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 130
Get Book Here
Book Description
Author: John S. Lawler
Publisher: Transportation Research Board
ISBN: 0309098971
Category : Aggregates (Building materials)
Languages : en
Pages : 130
Get Book Here
Book Description
NCHRP Report 566 is designed to help facilitate the use of supplementary cementitious materials to enhance durability of concrete used in highway construction, especially bridge decks. The report includes a methodology for selecting optimum concrete mixture proportions that focuses on durability aspects of concrete and the performance requirements for specific environmental conditions. The methodology is presented in a text format and as a computational tool, in the form of a Visual Basic?driven Microsoft Excel spreadsheet. Background information and a hypothetical case study was published as NCHRP Web-Only Document 110: Supplementary Cementitious Materials to Enhance Durability of Concrete Bridge Decks. The Statistical Experimental Design for Optimizing Concrete (SEDOC), the computational tool for the concrete mixture optimization methodology, and the user?s guide are available in a ZIP format for download.
