Publication Date

2018-12-05

Availability

Open access

Embargo Period

2018-12-05

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PHD)

Department

Civil, Architectural and Environmental Engineering (Engineering)

Date of Defense

2018-08-16

First Committee Member

Antonio Nanni

Second Committee Member

Francisco De Caso y Basalo

Third Committee Member

Qingda Yang

Fourth Committee Member

Landolf Rhode-Barbarigos

Fifth Committee Member

Prannoy Suraneni

Abstract

Inorganic based composites are a new class of materials used in strengthening and rehabilitation of masonry and concrete structures. In the literature, these composites have been identified using different terminology, among which, Fabric Reinforced Cementitious Matrix (FRCM) and Steel Reinforced Grout (SRG) are adopted by the North American guidelines and acceptance criteria. FRCM fabric/s may consists of carbon, aramid, glass, basalt or polyparaphenylene benzobisoxazole (PBO) fiber rovings that are embedded in an inorganic matrix. SRG shares the same technology with FRCM, except that the fabrics consist of twisted galvanized steel wires which form steel cords. Developed as alternatives to fiber-reinforced polymer (FRP) composites, FRCM provides a better compatibility to masonry/concrete substrate and superior resistance to high temperatures, ultraviolet radiation, and moisture by virtue of their cementitious matrix. The purpose of this doctoral dissertation is to provide a better understanding of mechanical behavior of FRCM/SRG for rehabilitation and strengthening of concrete structures including the transportation infrastructure. The dissertation is a combination of three individual but interconnected studies. In the first study, mechanical properties of various FRCM/SRG composites were investigated. The objective of the second study is to discuss the effectiveness of FRCM/SRG composites to improve the flexural strength of reinforced concrete (RC) beams. An appealing use of FRCM composites is in RC bridges which are subject to cycles of loading and unloading from the vehicular traffic, and thus, liable to fatigue failure. Therefore, the last study regards the fatigue performance of FRCM-strengthened RC beams.

Keywords

FRCM; Composite; Cement; Bonded; Rehabilitation; Concrete

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