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Full-Text Articles in Structural Engineering
Using Historic Pavement Performance Data To Identify And Select Sites For Asphalt Mixture Design Studies, Allyson Richey
Using Historic Pavement Performance Data To Identify And Select Sites For Asphalt Mixture Design Studies, Allyson Richey
Civil Engineering Undergraduate Honors Theses
Since 1997 Arkansas asphalt mixtures have been designed using a procedure commonly known as ‘Superpave’. In a traditional Superpave mix design, the design considers only traditional volumetric parameters; however, recent advances in mix design technology emphasize mixture’s ability to perform in its environment. There are numerous factors which affect the performance characteristics of an asphalt mix. Certainly, the asphalt binder’s performance is a critical variable in this system. Asphalt binders are sensitive to temperature, so much so that their primary parameter on which they are recommended is a function of both temperature and the geographic latitude in which the pavement …
Fatigue Analysis Of The Greenup Lock Gate On The Ohio River, Maggie Langston
Fatigue Analysis Of The Greenup Lock Gate On The Ohio River, Maggie Langston
Civil Engineering Undergraduate Honors Theses
This thesis analyzes damage due to fatigue of a typical lock gate on the United States waterway transportation system. Functioning lock gates are essential for this mode of transportation because they control water levels and provide access through dams for ships. Fatigue cracking is caused by cyclic loading and corrosion. Cyclic loading on a lock gate was imitated using a finite element model. This model was used to calculate stress ranges for a cycle so that the number of cycles to failure could be calculated. The proportion of cycles to cycles to failure is known as the fatigue capacity. A …
Effects Of Wash Water On The Compressive Strength Of Concrete, Gabriel W. Cook
Effects Of Wash Water On The Compressive Strength Of Concrete, Gabriel W. Cook
Civil Engineering Undergraduate Honors Theses
Due to the scale of concrete production throughout the world, there is potential for implementing methodologies that reduce the environmental impact of concrete processes. One intriguing solution is utilizing concrete wash water as mixing water. Concrete wash water is the water created by concrete production. If wash water can be reused, this would provide a safe disposal of the water and save millions of gallons of potable water per year (Indiana, 2014). For this to become a realistic option for concrete plants, it is important that the wash water does not decrease the compressive strength of concrete, otherwise the cost …
Effectiveness Of Small Strain Shear Wave Velocity As A Property For Assessing Damage Associated With Alkali-Silica Reaction In Concrete, Dillon K. Self
Effectiveness Of Small Strain Shear Wave Velocity As A Property For Assessing Damage Associated With Alkali-Silica Reaction In Concrete, Dillon K. Self
Civil Engineering Undergraduate Honors Theses
This research paper details the monitoring of expansion and shear wave velocity for fifteen concrete prisms cast in accordance with ASTM C1293 utilizing five mix designs with varying levels of ASR reactivity. Jobe sand and sodium hydroxide pellets were added in various quantities to increase the reactivity of the prisms. Strain measurements of the prisms were taken according to ASTM C129 and the shear wave velocity of the prisms was measured using ASTM C215. These measurements were taken weekly, then monthly for over a year. It was determined that shear wave velocity of the prisms decrease linearly as strain in …
Induced Earthquakes And Public Safety, Lyndsey L. Dickson
Induced Earthquakes And Public Safety, Lyndsey L. Dickson
Civil Engineering Undergraduate Honors Theses
Like the number of earthquakes felt in Oklahoma, the number of media reports regarding large-magnitude earthquakes in Oklahoma has increased in recent years. News headlines that mention property damage and question who is responsible have sparked heated debated. In this document, a discussion is presented over the responsibility of engineers for the public’s safety in relation to earthquakes. Input from various groups is discussed, the action taken in Oklahoma is outlined, and ethical obligations presented by the American Society of Civil Engineers are considered. The United States Geological Survey (USGS) has reported a major grievance against building-code committees, but many …
Predicted Vs Measured Initial Camber In Precast Prestressed Concrete Girders, Luke T. Freedle
Predicted Vs Measured Initial Camber In Precast Prestressed Concrete Girders, Luke T. Freedle
Civil Engineering Undergraduate Honors Theses
Prestressing of concrete is the introduction of permanent internal stresses in a structure or system in order to improve its performance. Concrete is strong in compression but weak in tension. The tensile strength of concrete is approximately 10% of the concrete’s compressive strength. Prestressing strands helps counteract this by introducing compressive stress in the area that will experience tensile stress because of the service load. In precast prestressed concrete girders, strands are placed in the bottom flange of the girder. These strands are tensioned to approximately 75% of their ultimate tensile capacity. After placing the concrete and after the required …