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Document Type

Thesis - University Access Only

Award Date

2015

Degree Name

Master of Science (MS)

Department

Agricultural and Biosystems Engineering

First Advisor

Nadim Wehbe

Abstract

An experimental research study was conducted at South Dakota State University to evaluate fiber-reinforced concrete (FRC) for structure components. An extensive literature review was performed to investigate prevailing practices regarding design and construction of FRC structural components. Various transportation agency employees were interviewed to assess performance of previous FRC projects and discuss agency specifications and practices. A laboratory testing plan was developed to address optimal fiber dosage, verify material properties, and assess manufacturers’ claims regarding material performance. The literature review allowed for investigation of successful practices used regionally and nationally. Common construction equipment and methods are used for FRC construction with no complications. Typical practice for FRC design was to use common mix design methods for plain concrete and add fibers to the concrete mix at a dosage rate that meets specifications. FRC specifications from states around the country tended to specify fibers by fiber material, fiber size, and either dosage rate or minimum average residual strength. Interviews of various transportation agency employees allowed for further investigation of common construction methods and FRC specifications. Similar to what was determined from the literature review, typical construction equipment and methods can be used for FRC applications without complications. Also, the Illinois DOT stated that they typically specify addition of fibers by the fiber length, aspect ratio, and dosage rate. The laboratory testing plan was performed on a select list of fibers to investigate various fresh and hardened concrete properties using various ASTM and ACI standard test procedures. Air content, unit weight, concrete temperature, compressive strength, modulus of elasticity, and flexural strength showed no correlation to fiber dosage or type. Slump displayed a negative correlation to fiber dosage, while average residual strength, equivalent flexural strength ratio, and impact resistance displayed a positive correlation to fiber dosage. Optimal dosage rates for the selected fibers were recommended based on current specifications for each application. (Abstract includes Table 1-1: Recommended fiber volume fractions.)

Library of Congress Subject Headings

Fiber-reinforced concrete Reinforced concrete construction

Description

Includes bibliograp[hical references (pages 162-169)

Format

application/ pdf

Number of Pages

257

Publisher

South Dakota State University

Rights

In Copyright - Educational Use Permitted
http://rightsstatements.org/vocab/InC-EDU/1.0/

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