Masters Theses

Abstract

“This study developed finite element models (FEMs), using LS-Dyna software, to investigate the repair of corroded steel H-piles using concrete jacket. The concrete modeled as a layered material simulating 3D printed concrete. 3DPC is a new technology that can be used to repair or build structures without formwork by depositing concrete mixture layer by layer. For the 3DPC, this study investigated the feasibility of using alkali-activated concrete (AAC) synthesized using class C fly ash as the main binder. The fresh properties, extrudability, and buildability of the proposed concrete were investigated through open time and deformation tests, respectively. Hardened properties were also investigated through compressive strength. The effect of different cycle times (CTs) between subsequent layers and the effect of the loading direction on the compressive strength were investigated. Furthermore, a microstructural analysis was conducted to evaluate the bond area for a better understanding of the bond between subsequent layers. The developed mixtures had open time ranging from 2.5 to 31 minutes. The axial strain due to the deposition of concrete ranged from 0.17 to 11.2%. In terms of compressive strength, increasing the CT decreased the compressive strength of the 3DPC specimens. Anisotropic behavior was observed for 3DPC specimens tested in different directions. Microstructural analysis showed relatively high and low bond strength between layers having short and long CT, respectively. The FEMs showed that the behavior and the axial capacity of steel H-pile repaired with either 3DPC or traditional concrete were relatively close, which indicated that 3DPC using AAC has the potential to be used for repairing steel H-piles”--Abstract, page iv.

Advisor(s)

ElGawady, Mohamed

Committee Member(s)

Yan, Guirong Grace
Kumar, Aditya

Department(s)

Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2021

Journal article titles appearing in thesis/dissertation

  • Developing mix proportions of class C fly ash based geopolymer mortar for use in simulating 3D-printing
  • Numerical analysis of layered concrete encasing corroded steel bridge column

Pagination

xii, 83 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2021 Fareh Waleed Abudawaba, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 11970

Electronic OCLC #

1313117375

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