Browsing Civil & Environmental Engineering Masters Theses by Issue Date
Now showing items 21-40 of 61
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An Anisotropic Damage Mechanics Model for Concrete with Applications for Fatigue Loading and Freeze-Thaw Effects
(North Dakota State University, 2013)It is well known that the formation and propagation of microcracks within concrete is anisotropic in nature, and has a degrading effect on its mechanical performance. In this thesis an anisotropic damage mechanics model ... -
An Investigation into Bromate Formation in Ozone Disinfection Systems
(North Dakota State University, 2013)Ozonation is used as an alternative disinfection process to chlorination but unfortunately has a potential of oxidizing bromide, a natural component of water sources, to bromate. Bromate is a possible carcinogen with a ... -
Modeling of Surface Microtopography and its Impacts on Hydrologic Processes
(North Dakota State University, 2014)Understanding the impacts of surface microtopography on hydrologic processes is critical. The objectives of this thesis research are: (1) to evaluate the effects of DEM resolution on microtopographic characteristics, ... -
Modeling of Temperature Impacts on Fixed Film Microbial Growth and Nitrification Kinetics
(North Dakota State University, 2014)Monod-type kinetic models, used in simulating microbial growth in biological treatment systems, suggest significant decreases of substrate utilization at lower temperatures. However, it is documented that performance of ... -
Energy-Saving Non-Metallic Connectors for Precast Sandwich Wall Systems in Cold Regions
(North Dakota State University, 2014)Conserving energy in large structural buildings has become very important in today's economy. A number of buildings today are constructed with sandwich wall panels. Steel connections are most commonly used in these panels. ... -
Development of Operational Strategies to Minimize Bromate Formation in the Moorhead Water Treatment Plant
(North Dakota State University, 2014)A recent study at the Moorhead water treatment plant (MWTP) determined that bromate formed during ozone disinfection and, at times, exceeded the maximum contaminant level (MCL) of 10 parts per billion (ppb) in the summer ... -
Identification of Delamination Defects in CFRP Materials through Lamb Wave Responses
(North Dakota State University, 2014)Delamination is currently a largely undetectable form of damage in composite laminate materials. This thesis will develop a method to more easily detect delamination damage within composite materials. Using finite element ... -
Hydrologic Experiments and Analysis: The Effect of Microtopography on Runoff Generation
(North Dakota State University, 2014)Microtopography is an important factor in hydrologic processes. The purpose of this research was to study the effects of microtopography on runoff generation. Specifically, this was performed through an array of physical ... -
Infiltration and Unsaturated Flow under the Influence of Surface Microtopography: Model Simulations and Experimental Observations
(North Dakota State University, 2014)Surface microtopography affects fundamental hydrologic processes including infiltration and soil-water percolation at different scales. By means of studying the unsaturated flow, this thesis research is aimed to evaluate ... -
Structural Enhancement Utilizing Smart Materials: Experiments and Applications Involving Piezoelectric Actuators and Shape Memory Alloys
(North Dakota State University, 2015)Smart materials, within the realm of structural engineering, are mainly used as either sensoric mechanisms or as structural damping mechanisms. For the most part, structural enhancement utilizing smart materials is not ... -
Application of Damage Mechanics to Describe the Behavior of Concrete under Fatigue and Freeze-Thaw Processes
(North Dakota State University, 2015)Concrete has been used in dams, bridges, and highway pavements in which freeze-thaw process and cyclic loading are important factors affecting its mechanical behavior. Damage caused by frost expansion is a primary concern ... -
In-Line Fiber Optic Sensing System for Pipeline Corrosion Detection
(North Dakota State University, 2015)To understand the impact of corrosion on metal on-shore buried transmission pipeline, which is one of the most critical damages, corrosion evaluation plays an important role. An effective approach for real-time in-line ... -
Damage Localization of Slab-on-Girder Bridges Through Vibration Characteristics
(North Dakota State University, 2015)An incompletely documented bridge 09-125-16 in Cass County, ND was tested by Bridge Diagnostics, Inc. (BDI). A Grillage numerical model is created with their field data to simulate the bridge responses due to traffic loads. ... -
Coating of NZVI Particles With Modified Starch: Colloidal Stability and Nitrate Reduction Studies
(North Dakota State University, 2015)Nanoscale-zero valent iron (NZVI) is an effective groundwater remediation media because it can quickly reduce and absorb contaminants. However, NZVI quickly agglomerates in aqueous systems, reducing its remediation capacity. ... -
Electrochemical Investigation of Corrosion Resistance of Weldments in Steel Bridges
(North Dakota State University, 2015)Welding is commonly used for connecting steel components in steel bridge fabrication and construction. Welding processes change the microstructures, properties of surrounding steel and its surface texture. In this study, ... -
Explore Accelerated PCC Pavement Repairs Using Metakaolin-Based Geopolymer Concrete
(North Dakota State University, 2015)In order to adopt geopolymer concrete as a pavement repair material due to its better durability, splitting and slant shear tests are performed. Effect of curing time, degradation of the pavement concrete under different ... -
The Role of Algal Species on Phosphorus Bioavailability in Secondary Wastewater Effluents
(North Dakota State University, 2016)Phosphorus (P) is a limiting nutrient responsible for the eutrophication of surface waters and marine coasts. Wastewater treatment technologies are being stressed to achieve low P effluents and national effluent P limits ... -
Dispersion Effectiveness of Carbon Nanotube Additives in Self-sensing Cementitious Materials for Structural Health Monitoring
(North Dakota State University, 2016)The use of self-sensing materials such as piezo-resistive cementitious materials modified by carbon nanotube (CNTs) additives may be able to achieve a potential real time structural health monitoring in structures. However, ... -
Development of Passenger Car Equivalency Values for Heavy Vehicles for Protected Left-Turn Movements at Signalized Intersections
(North Dakota State University, 2016)The Highway Capacity Manual (HCM) provides methods to account for the impact of heavy vehicles in the operational assessment and design of signalized intersections. However, the overall impact of heavy vehicles on the ... -
In-Pavement Fiber Bragg Grating Sensors for Weight-In-Motion Measurements
(North Dakota State University, 2016)Estimation a traffic over the design period is one of the critical factors in pavement design. Weight-in-motion (WIM) sensors have become popular for weight measurements. A three-dimension glass fiber-reinforced polymer ...