Masters Theses

Alternative Title

Bond strength of high volume fly ash concret

Abstract

"Concrete is the most consumed man-made material in the world. Unfortunately, due to the production of cement, concrete has a large carbon footprint. Replacement of cement with fly ash, an industrial waste product, offers a sustainable alternative. The goal of this research was to explore the feasibility of using high-volume fly ash (HVFA) concrete for structural applications by testing the material's reinforcement bond properties. A series of pull-out tests and beam splice tests were performed on specimens with a 70 percent fly ash replacement of cement and then compared to identical tests performed on control specimens cast from a 100 percent portland cement mix. The pull-out tests were performed on specimens with either No. 4 or No. 6 bars, while the beam splice tests were performed on specimens with No. 6 bars with and without confinement (transverse reinforcement) along the splice zone. The data recorded from the pull-out tests supports the effectiveness of HVFA concrete in terms of bond integrity. Since the pull-out test is a comparative test, this conclusion can be drawn based on the fact that the HVFA specimens demonstrated similar bond strengths to the control specimens (based on maximum modified applied load). The only drawback from testing was that once the concrete began to crush around the reinforcing bar, slip occurred at a higher rate for the HVFA specimens. The load data collected from the splice tests, once modified for the respective specimen compressive strengths, indicates that the HVFA concrete specimens were able to support more load than the control specimens before the splice failed. These findings, along with the findings from the pull-out tests, indicate that the use of high volumes of fly ash as a cement substitute is not only feasible in terms of bond, but also superior in some cases"--Abstract, page iii.

Advisor(s)

Volz, Jeffery S.

Committee Member(s)

Myers, John
Richardson, David Newton

Department(s)

Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering

Sponsor(s)

AmerenUE
BASF Admixtures
Mississippi Lime
Gypsum Association (U.S.)

Publisher

Missouri University of Science and Technology

Publication Date

Summer 2011

Pagination

xiv, 118 pages

Note about bibliography

Includes bibliographical references (page 75).

Rights

© 2011 Michael Hayse Wolfe, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Concrete -- Additives
Fly ash
Reinforced concrete -- Testing

Thesis Number

T 9873

Print OCLC #

785247415

Electronic OCLC #

729265133

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