Doctoral Dissertations

Keywords and Phrases

Concrete; Fiber-reinforced concrete; Fibers; Rheology; Self-consolidating Concrete; Super-workable concrete

Abstract

“The objective of this document is to design high-performance fiber-reinforced self-consolidating concrete (FR-SCC) for infrastructure repair and fiber-reinforced super-workable concrete (FR-SWC) for bridge construction. The investigated fibers included propylene synthetic fibers, hooked steel fibers, double and triple hooked steel fibers, hybrid crimped steel fiber and polypropylene multifilament fibers, and micro-macro steel fibers. The fiber volume varied between 0 and 0.75%. An expansive agent (EA) was incorporated to compensate for shrinkage and induce compression in the concrete at early age. Two types of EA (G and K) were employed at 0 to 8%, by mass of binder. The investigated FRSCC and FR-SWC mixtures achieved excellent passing ability and stability. Compared to non-fibrous mixtures, the optimized mixtures exhibited 30% and 110% increase in compressive and splitting tensile strengths, respectively, and developed high toughness. The combined use of EA and fibers led to a synergetic effect of increasing the resistance to restrained shrinkage cracking. Low cracking potential was observed for mixtures made with steel fibers combined with EA compared to high cracking potential in case of nonfibrous SCC. The optimized FR-SWC mixture, with some adjustments to reduce fluidity, was successfully used for the re-decking of a bridge in Missouri. The concrete exhibited high workability and was easily pumped, consolidated, and finished. After 18 months, no signs of cracking were observed in the deck, except for hairline cracks near the intermediate bent. The high-performance fibrous concrete can provide cost saving of up to 55% in areas with high traffic volume but limited savings in the low traffic volume areas”--Abstract, page iii.

Advisor(s)

Khayat, Kamal

Committee Member(s)

ElGawady, Mohamed
Volz, Jeffery S.
Feys, Dimitri
Kumar, Aditya

Department(s)

Civil, Architectural and Environmental Engineering

Degree Name

Ph. D. in Civil Engineering

Comments

The financial support provided by the National University Transportation Center (NUTC) and the RE-CAST University Transportation Center at Missouri S&T is very much appreciated.

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2019

Pagination

xxiii, 282 pages

Note about bibliography

Includes bibliographic references (pages 275-281).

Rights

© 2019 Ahmed Abdelrazik, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 11990

Electronic OCLC #

1313117357

Download

Share

 
COinS