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Full-Text Articles in Engineering
Chitosan-Based Shrinking Fibers For Post-Cure Stressing To Increase Durability Of Concrete, Diarmuid Gregory
Chitosan-Based Shrinking Fibers For Post-Cure Stressing To Increase Durability Of Concrete, Diarmuid Gregory
Graduate College Dissertations and Theses
Concrete is a ubiquitous building material with an extensive history, yet it has a fair number of imperfections. Its sizeable environmental impact, low tensile to com- pressive strength ratio, and lack of durability leave room for innovation. Concrete durability frames the motivation for this research.This thesis presents the motivation, methods, and findings of tests performed to quantify the durability of concrete reinforced with automatically shrinking chitosan- based fibers. A literature review, the procedures for synthesizing chitosan fibers, and preliminary tests of the control fibers are all discussed. Two different types of durability tests were carried out: rapid freezing and thawing …
Active Acoustic Sensing Technologies For Practical Uav-Based Condition Assessment Of Underside Bridge Decks, Damien Garland
Active Acoustic Sensing Technologies For Practical Uav-Based Condition Assessment Of Underside Bridge Decks, Damien Garland
Graduate College Dissertations and Theses
Reinforced concrete bridge decks are high performance structural elements that must survive decades of harsh mechanical and environmental loads. The structural health monitoring of bridges is a primary enabler of safe and cost-effective performance, relying on frequent inspections and repairs as needed. The undersides of concrete bridge decks are oft-overlooked areas of inspection, owing to a hard to reach and difficult location to access. Exacerbating factors to the degradation of concrete bridge decks are the freeze-thaw cycle and salt water related corrosion common in the world’s Northern climates. As concrete weathers, it decays. Corrosion induced cracking and delamination are primary …