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 5 of 5 for “"concrete tie"”.
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Hydraulic Mechanisms of Concrete-Tie Rail Seat Deterioration
… is considered the most critical problem with concrete-tie performance on North American freight railroads. RSD is the deterioration of the concrete underneath the rail that results in problems such as wide gauge, insufficient rail cant, and loss of fastening toe load. Currently, the problem is …
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Mitigation of differential movements at railroad bridge transition zones
… and (b) develop a mobile system that focuses on tie behavior by measuring rail and crosstie displacements. Three-dimensional dynamic numerical modeling of bridge transition zones was also performed to investigate how changes in ballast settlement affect the transition zone loading environment. …
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Damage assessment in reinforced concrete using contactless ultrasound
… structural health monitoring (SHM) for existing concrete structures. Conventional contact-type ultrasonic testing (UT) methods offer efficient and useful approaches to characterize internal defects in concrete structures in a nondestructive fashion. However, the large testing areas normally …
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The mechanics of abrasion on concrete crosstie rail seats
… as one of the primary factors limiting concrete crosstie service life, particularly in heavy-haul freight operations. RSD refers to the degradation of the material at the contact interface between the concrete crosstie rail seat and the rail pad assembly that protects the bearing area of …
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Freeze-thaw environment of precast concrete crossties and effect of vibration on fresh materials
High performance concrete is typically designed to achieve high strength and low permeability. These suppositions lead practitioners to install high performance concrete in outdoor environments assured that members will remain durable over scores of years. One such outdoor environment is in …