Date on Master's Thesis/Doctoral Dissertation

8-2017

Document Type

Master's Thesis

Degree Name

M.S.

Department

Civil and Environmental Engineering

Degree Program

Civil Engineering, MS

Committee Chair

McGinley, W. Mark

Committee Co-Chair (if applicable)

Kim, Young Hoon

Committee Member

Kim, Young Hoon

Committee Member

Yang, Li

Author's Keywords

fiber reinforced mortar; DEM; prediction; flexural strength

Abstract

With the continuous advances in materials’ technology, the performance of the commonly used concrete building material has continued to improve. Compressive strengths exceeding 75 MPa are now being used in applications throughout the world. However, the concrete becomes less ductile and more susceptible to sudden failures with increases in its compressive strength. Although the behavior of concrete is generally governed by its compressive strength, its tensile strength, although much lower, is also important. This tensile strength impacts appearance, the serviceability and durability of concrete elements. In addition, minimum levels of tensile strength are required for many concrete applications including, earthquake resistant structures, tanks and other fluid containment structures, runways, slabs and pavement the addition of steel fibers also improves the tensile strength of the composite, a significant structural weakness of concrete. At the micro-level, fibers inhibit the initiation and growth of cracks, and after the micro-cracks coalesce into macro-cracks, fibers abate their unstable propagation, bridging the cracks and improving strength, toughness and ductility. This investigation extended an analytical developed by other for general flexural behavior of fiber reinforced composite concrete materials. Reasonable agreement was found between the model and measured behavior. The model is sufficiently accurate to identify which factors may affect flexural strength and how configurations can be optimized to improve this strength.

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