Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 369 for “"Service Life"”.
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Investigating DC circuit breaker service life
This thesis investigates methods to extend the service life of DC circuit breakers using inductive voltage spike mitigation techniques aimed at reducing electric arcs during switching operations. Unlike AC systems, DC lacks a natural zero-crossing which results in large transient voltages that …
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Service Life Modeling of Virginia Bridge Decks
… to determine the time to the End of Functional Service Life (EFSL) for concrete bridge decks in Virginia was developed. The service life of Virginia bridge decks is controlled by chloride-induced corrosion of the reinforcing steel. Monte Carlo resampling techniques were used to integrate the …
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Reliability analysis and service life prediction of pipelines
… should be considered in both the strength and serviceability analysis of pipes. The study in this research focuses on two different types of buried pipes including concrete pipes in sewage systems (concrete sewers) and cast iron water pipes used in water distribution systems. This research …
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Enhancing the service life of concrete exposed to chloride attack
… is insufficient to satisfy the designed working life. The second phase investigated the application of suitable maintenance approach involving ECE and SC treatment on the chloride contaminated concrete prior to the corrosion of embedded steel. The selected specimens were 100PC, 70PC30FA and …
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Numerical optimisation of biomedical implant characteristics for increased service life.
… turn could increase Total Hip Arthroplasty (THA) service life and reduce patient discomfort by employing a distributed stiffness along implant length. Research found that through distributing stiffness along THA stem length, significant reductions in stress shielding can be achieved without …
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Service life extension of reinforced concrete structures using hydrophobic impregnation
… of existing structures to maintain serviceability while indirect costs include loss in productivity and reduced economic growth. With increasing demand for infrastructure and subsequent expansion of the built environment, there is greater need for concrete to withstand and perform in …
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Ash impacts on gasoline particulate filter performance and service life
… of the filter during the course of its service life. It is important to understand the impact of ash on the filter pressure drop performance before implementing GPF to meet new emissions regulations. This study builds on existing diesel particulate filter technology and demonstrates …
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Parametric Model for Assessing Factors that Influence Highway Bridge Service Life
… impact facility performance and shorten its service life. Socioeconomic, technological, regulatory, and user value changes can substantially increase the service expectations of existing facilities. Based on a theoretical framework drawn from prior work, this research develops a new approach …
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Durability Assessment and Service Life Prediction of Concrete in Extreme Aggressive Environment
… these correlations and based on the target service life, the research aims to set appropriate thresholds for Surface Resistivity (SR) and Bulk Resistivity (BR) tests, which will be used to qualify concrete mixes used in in extremely aggressive chloride environments. To achieve these …
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Service life of organic coatings: strategies for improving aesthetic and protective durability
It is probably needless to mention that organic coatings are of paramount importance nowadays. Although the huge number of applications and their wide spread can suggest that organic coatings have now reached a level of maturity, they are still mysterious from a certain point of view. The behaviour …
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A Practical Carbonation Model for Service Life Design of Reinforced Concrete Structures
… proposed design tool assists in computing the service life of carbonating concrete structures and provides reliability values associated with the service life. It accounts for different binder compositions and binder types, as well as different locations and environmental land uses in South …
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Quantifying the Service Life and Potential Environmental Benefits of Recycled Asphalt Pavements
In-service pavements require maintenance and rehabilitation (MandR) interventions to keep them in compliance with structural and functional standards. With the increased focus on the sustainability of our roadway systems, it has become important to document the cost and environmental impacts of …
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Service life determination of concrete bridge decks and bridge deck overlay systems
… corrosion. This study investigated the service life of untreated concrete bridge decks and four bridge deck overlay systems: low-slump-dense concrete (LSDC), latex-modified concrete (LMC), micro-silica concrete (MSC), and preformed membranes with hot-mix asphalt overlays (PM-HMA). The …
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Determination of the end of functional service life for concrete bridge components
… components reach the end of their functional service life when the level of damage warrants rehabilitation. The objective of this study was to determine the end of functional service life for concrete bridge decks, piers, and abutments by quantifying terminal levels of physical damage. The …
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Thermal fracture service life analysis of a case bonded visco-elastic cylinder
Environmental temperature changes produce cyclic thermal stresses in structures. Because temperature and hence thermal stresses are random and mechanical properties such as strength, relaxation modulus, and fracture toughness are time and temperature dependent as well as statistically variable …
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Modelling of transport processes involved in service life prediction of concrete: important principles
The main focus in this licentiate thesis is a description of the environmentally introduced action of diffusing and chemically reactive (e.g. carbonation and chemical-physical adsorption-desorption) matter in the pore solution and in the air-filled space in the pore system of the material. The …
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Corrosion Protection Service Life of Epoxy Coated Reinforcing Steel in Virginia Bridge Decks
The corrosion protection service life extension provided by epoxy-coated reinforcement (ECR) was determined by comparing ECR and bare bar from 10 bridge decks built between 1981 and 1995. The objective was to determine the corrosion protection service life time extension provided by ECR field …
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Probabilistic service life prediction of composite viscoelastic cylindrical structure under random outdoor environment
… a general methodology for probabilistic service life prediction of a composite viscoelastic cylindrical structure under random outdoor environment. The analysis emphasized both the statistical variations of environmental thermal loads and of material properties. The daily probability of …
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Chloride Penetration Resistance and link to Service Life Design of Virginia Bridge Decks
… high costs of corrosion have sparked interest in service life design of bridge decks. This thesis characterized the exposure conditions of Virginia, including temperature and surface chloride concentration, as well as Virginia concrete mix properties, including initial chloride concentration and …
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Determination of the service life of concrete sealers on horizontal and vertical bridge members
… from reaching critical contamination within the life of the structure. One method of protection is the application of concrete surface sealers which form water-resistant barriers and reduce chloride intrusion. It is imperative to know how effective sealers are and how long sealers retain their …
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