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Full-Text Articles in Engineering
Development Of Corrosion Inhibiting Geopolymers Based Cement For Transportation Infrastructure, Homero Castaneda, Miladin Radovic, Changkyu Kim, Oscar Huang
Development Of Corrosion Inhibiting Geopolymers Based Cement For Transportation Infrastructure, Homero Castaneda, Miladin Radovic, Changkyu Kim, Oscar Huang
Data
Geopolymers are gaining attention as affordable, sustainable, and eco-friendly replacement for Ordinary Portland Cement (OPC) in concrete civil structures. More importantly, Geopolymer-based Cement (GPC) provide sustainable and environmentally friendly alternative to OPCs as GPC can be processed at room temperatures from aqueous solutions of waste materials (e.g., fly ash) or abounded natural sources (e.g., clay) and thus reduce significant CO2 production associated with processing of OPC. Although, a lot of work has been done on improving mechanical properties of GPC over the last two decades, there are only a few studies on effects of GPC concrete on steel rebar …
Development Of Corrosion Inhibiting Geopolymers Based Cement For Transportation Infrastructure, Homero Castaneda, Miladin Radovic, Changkyu Kim, Oscar Huang
Development Of Corrosion Inhibiting Geopolymers Based Cement For Transportation Infrastructure, Homero Castaneda, Miladin Radovic, Changkyu Kim, Oscar Huang
Publications
Geopolymers are gaining attention as affordable, sustainable, and eco-friendly replacement for Ordinary Portland Cement (OPC) in concrete civil structures. More importantly, Geopolymer-based Cement (GPC) provide sustainable and environmentally friendly alternative to OPCs as GPC can be processed at room temperatures from aqueous solutions of waste materials (e.g., fly ash) or abounded natural sources (e.g., clay) and thus reduce significant CO2 production associated with processing of OPC. Although, a lot of work has been done on improving mechanical properties of GPC over the last two decades, there are only a few studies on effects of GPC concrete on steel rebar …
Longer Service Life Bridge Coatings, Danny Wells, Theodore Hopwood, Bobby Meade, Sudhir Palle
Longer Service Life Bridge Coatings, Danny Wells, Theodore Hopwood, Bobby Meade, Sudhir Palle
Kentucky Transportation Center Research Report
The Kentucky Transportation Cabinet (KYTC) has maintenance oversight responsibilities for approximately 1,100 steel bridges; it also helps local governments and other entities with maintenance painting on other steel bridges. Because maintaining steel bridges is costly, Cabinet officials asked Kentucky Transportation Center (KTC) researchers to identify materials and methods that will prolong their service lives. Steel bridges are uniquely vulnerable to deterioration resulting from exposure to atmospheric conditions (e.g. moisture, ultraviolet rays) and chlorides, the latter due to the application of deicing materials. This study examines two strategies for extending service lives. First, it appraises a novel method of hot dip …
Prototype System For Implementing The Ultrasonic Guided Wave Method On The Field, Ece Erdogmus, Eric Garcia, Michael Schuller, Ahmad Shoaib Amiri
Prototype System For Implementing The Ultrasonic Guided Wave Method On The Field, Ece Erdogmus, Eric Garcia, Michael Schuller, Ahmad Shoaib Amiri
Nebraska Department of Transportation: Research Reports
This report presents the latest improvements in a recently developed nondestructive testing (NDT) technique for early detection of various flaws such as corrosion, delamination, and concrete cracking in reinforced concrete (RC) bridge decks. The method, named Ultrasonic Guided Wave Leakage (UGWL) method by the developing authors, involves use of internal steel reinforcement (rebar) as a wave guide for transmitting ultrasonic waves through the system and the measurement of leaked energy at the surface of the concrete. This report builds upon the progress made in the previously published phases of the project (M029 and M066), and aims to further explore the …
Research Of The Possibility Of Using Waste Of Paint And Varnish Materials For Anti-Corrosion Protection Of Metal Parts Of Transport Equipment, Aida Barxanadjyan, Ravshan Hakimov, Botir Ibragimov
Research Of The Possibility Of Using Waste Of Paint And Varnish Materials For Anti-Corrosion Protection Of Metal Parts Of Transport Equipment, Aida Barxanadjyan, Ravshan Hakimov, Botir Ibragimov
Journal of Tashkent Institute of Railway Engineers
This work is devoted to the corrosion protection of metal parts of transport equipment. The purpose of this study is the use of waste paint and varnish materials (PVM) to obtain anti-corrosion coatings of metal parts. PVMwaste is the loss of paints obtained when painting automobiles. The epoxy polyurethane oligomer synthesized by us was used as a binder resin. During the research, the physicochemical properties of the waste were studied the components were selected to obtain anticorrosive mastic. The resulting mastic was tested in laboratory conditions in accordance with the standards for adhesion, chemical resistance, film strength in bending and …
Rapid Cross-Section Imaging With Magnetic And Impedance Sensors For Grout Anomaly Detection In External Post-Tensioned Tendons, Hani Freij
USF Tampa Graduate Theses and Dissertations
Post-tensioned (PT) bridges have had severe corrosion issues with tendons that fail suddenly without prior notice. The corrosion of external post-tensioned tendons has been associated with grout deficiencies/anomalies from inadequate grouting. Deficiencies include voids, regions of chalky low strength grout, and regions where excessive water content or even free water is present. In those zones mechanical bonding of strand to the grout is degraded and, of more concern, the strand steel risks corrosion failure reducing the expected lifespan of the structure. As tendons are critical structural components, it is important to detect those deficiencies during inspection preferably by a cross …
Bridge Resilience Assessment With Inspire Data, Iris Tien, Yijian Zhang
Bridge Resilience Assessment With Inspire Data, Iris Tien, Yijian Zhang
Project RR-1
This project proposed a methodology to assess the impact of corrosion on the performance of bridges. The combined analytical and numerical modeling of shear-critical and lap-spliced columns is detailed, and outcomes are verified with previous experimental test data. The impact of corrosion on risk is assessed through conducting fragility analyses. Results quantify the increase in failure probabilities of these structures, measured by increasing probabilities of exceeding defined damage states, with increasing levels of corrosion. Corrosion is found to have a larger impact on increasing probabilities of exceeding more severe damage states. Twenty percent mass loss of reinforcement increases the probability …
Relating Surface Resistivity To Corrosion Of Rebar Embedded In Portland Cement Concrete, Luisa Alejandra Morales
Relating Surface Resistivity To Corrosion Of Rebar Embedded In Portland Cement Concrete, Luisa Alejandra Morales
Open Access Theses & Dissertations
Reinforced concrete is widely used as a construction material known for its durability and proficiency of withstanding large forces in severe environments. Despite that the majority of these structures result in long-term performance, there is still a large number of failures of reinforced concrete structures as a result in corrosion of the reinforcement and concrete degradation. It is critical to assess the state of the corroded structure to decide on whether maintaining or replacing the structure is needed. The objective of this study is to characterize a relationship between the steel reinforcement corrosion and the concrete's resistivity. It is widely …