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Effects On Strength And Corrosive Characteristics Of Hardened Cement Paste Using Rice Husk And Sugarcane Bagasse, Travis D. Garrett 2020 Louisiana Tech University

Effects On Strength And Corrosive Characteristics Of Hardened Cement Paste Using Rice Husk And Sugarcane Bagasse, Travis D. Garrett

Master's Theses

Cement is one of the most used building materials in the world. The production of ordinary Portland cement contributes to the release of harmful greenhouse gasses. In an effort to reduce these emissions, different materials are being evaluated for their use as partial replacements for ordinary Portland cement. Rice husk and sugarcane bagasse are agricultural waste products and large amounts of these are currently landfilled, making them inexpensive and available. When combusted at high temperatures they form rice husk ash and sugarcane bagasse ash that have pozzolanic characteristics. The high silicon dioxide in these products makes them good options to ...


Countermeasures For Pedestrian-Involved Accidents On Interstate-Highways, Anna C. Hunter 2020 University of Arkansas, Fayetteville

Countermeasures For Pedestrian-Involved Accidents On Interstate-Highways, Anna C. Hunter

Civil Engineering Undergraduate Honors Theses

Pedestrian access to the Interstate is prohibited, but many pedestrian-involved accidents still occur on the Interstate in the United States. This project is a case study of West Memphis, Arkansas, which has the second highest occurrence of pedestrian-involved accidents on the Interstate in Arkansas. The study site location includes a segment of Interstate I-40 which is at- grade. The surrounding area contains several different land-uses, which is believed to be the primary generator of these accidents. The goal of this project is to determine the primary causes of these accidents and determine potential countermeasures to reduce the crash rate for ...


Prevention Of Harmful Algal Blooms By The Mitigation Of Phosphorus Nutrient Loading Via Filtration By Steel Wool And Activated Carbon, Samantha Zidd, Sara Kidd, Ronald Simpson 2020 The University of Akron

Prevention Of Harmful Algal Blooms By The Mitigation Of Phosphorus Nutrient Loading Via Filtration By Steel Wool And Activated Carbon, Samantha Zidd, Sara Kidd, Ronald Simpson

Williams Honors College, Honors Research Projects

Harmful Algal Blooms (HABs) are a devastating ecological and economic consequence of the abundance of nutrient-rich agricultural runoff entering aquatic ecosystems (Baker et al. 2014). Bioavailable phosphorus from synthetic fertilizers is one of the major nutrients contributing to this global issue. Preliminary studies indicate that dissolved phosphorus can be removed from an aqueous environment when passed through a composite mixture of granular steel wool particles and activated carbon (Erickson, Gulliver, and Weiss (2007). Further research was conducted using higher quality concentration measurements to determine what grades of steel wool (0000, 000, 00) and types of activated carbon (GAC, PAC, EAC ...


Improving An Experimental Test Bed With Time-Varying Parameters For Developing High-Rate Structural Health Monitoring Methods, D. T. Foley, B. S. Joyce, J. Hong, Simon Laflamme, J. Dodson 2020 University of Florida

Improving An Experimental Test Bed With Time-Varying Parameters For Developing High-Rate Structural Health Monitoring Methods, D. T. Foley, B. S. Joyce, J. Hong, Simon Laflamme, J. Dodson

Civil, Construction and Environmental Engineering Publications

With the development of complex structures with high-rate dynamics, such as space structures, weapons systems, or hypersonic vehicles, comes a need for real-time structural health monitoring (SHM) methods. Researchers are developing algorithms for high-rate SHM methods, however, limited data exists on which to test these algorithms. An experimental test bed to simulate high-rate systems with rapid parameter changes was previously presented by the authors. This paper expands on the previous work. The initial configuration consisted of a cantilevered steel beam with a cart-roller system on a linear actuator to create an adjustable boundary condition along the beam, as well as ...


Principal Component Neural Networks For Modeling, Prediction, And Optimization Of Hot Mix Asphalt Dynamics Modulus, Parnian Ghasemi, Mohamad Aslani, Derrick K. Rollins, R. Christopher Williams 2019 Iowa State University

Principal Component Neural Networks For Modeling, Prediction, And Optimization Of Hot Mix Asphalt Dynamics Modulus, Parnian Ghasemi, Mohamad Aslani, Derrick K. Rollins, R. Christopher Williams

Derrick K Rollins, Sr.

The dynamic modulus of hot mix asphalt (HMA) is a fundamental material property that defines the stress-strain relationship based on viscoelastic principles and is a function of HMA properties, loading rate, and temperature. Because of the large number of efficacious predictors (factors) and their nonlinear interrelationships, developing predictive models for dynamic modulus can be a challenging task. In this research, results obtained from a series of laboratory tests including mixture dynamic modulus, aggregate gradation, dynamic shear rheometer (on asphalt binder), and mixture volumetric are used to create a database. The created database is used to develop a model for estimating ...


Principal Component Neural Networks For Modeling, Prediction, And Optimization Of Hot Mix Asphalt Dynamics Modulus, Parnian Ghasemi, Mohamad Aslani, Derrick K. Rollins, R. Christopher Williams 2019 Iowa State University

Principal Component Neural Networks For Modeling, Prediction, And Optimization Of Hot Mix Asphalt Dynamics Modulus, Parnian Ghasemi, Mohamad Aslani, Derrick K. Rollins, R. Christopher Williams

Chemical and Biological Engineering Publications

The dynamic modulus of hot mix asphalt (HMA) is a fundamental material property that defines the stress-strain relationship based on viscoelastic principles and is a function of HMA properties, loading rate, and temperature. Because of the large number of efficacious predictors (factors) and their nonlinear interrelationships, developing predictive models for dynamic modulus can be a challenging task. In this research, results obtained from a series of laboratory tests including mixture dynamic modulus, aggregate gradation, dynamic shear rheometer (on asphalt binder), and mixture volumetric are used to create a database. The created database is used to develop a model for estimating ...


Soil-Bentonite Slurry Trench Cutoff Wall Bore Logs, Jeffrey C. Evans 2019 Bucknell University

Soil-Bentonite Slurry Trench Cutoff Wall Bore Logs, Jeffrey C. Evans

NSF Soil-Bentonite Slurry Trench Cutoff Wall Documents

Bore logs for the soil-bentonite slurry trench cutoff wall constructed in Montandon Pennsylvania.


General Nonlinear-Material Elasticity In Classical One-Dimensional Solid Mechanics, Ronald Joseph Giardina Jr 2019 University of New Orleans

General Nonlinear-Material Elasticity In Classical One-Dimensional Solid Mechanics, Ronald Joseph Giardina Jr

University of New Orleans Theses and Dissertations

We will create a class of generalized ellipses and explore their ability to define a distance on a space and generate continuous, periodic functions. Connections between these continuous, periodic functions and the generalizations of trigonometric functions known in the literature shall be established along with connections between these generalized ellipses and some spectrahedral projections onto the plane, more specifically the well-known multifocal ellipses. The superellipse, or Lam\'{e} curve, will be a special case of the generalized ellipse. Applications of these generalized ellipses shall be explored with regards to some one-dimensional systems of classical mechanics. We will adopt the Ramberg-Osgood ...


Hydration Of Binary Portland Cement Blends Containing Silica Fume: A Decoupling Method To Estimate Degrees Of Hydration And Pozzolanic Reaction, Wenyu Liao, Xiao Sun, Aditya Kumar, Hongfang Sun, Hongyan Ma 2019 Missouri University of Science and Technology

Hydration Of Binary Portland Cement Blends Containing Silica Fume: A Decoupling Method To Estimate Degrees Of Hydration And Pozzolanic Reaction, Wenyu Liao, Xiao Sun, Aditya Kumar, Hongfang Sun, Hongyan Ma

Hongyan Ma

Determination of degrees of hydration/reaction of components of blended cementitious systems (i. e., cement and SCMs: supplementary cementitious materials) is essential to estimate the systems' properties. Although the best methods for determining degrees of reaction of different SCMs have been recommended by RILEM TC238, they rely on either expensive equipment (e.g., nuclear magnetic resonance) or time-consuming sample preparation and data processing (e.g., backscattered electron image analysis). Furthermore, these methods cannot simultaneously characterize degree of hydration of cement and degree of reaction of SCMs. A novel decoupling method, which can simultaneously estimate the degree of hydration of cement ...


Investigating The Removal Of Stormwater Pollutants In Small-Scale, Constructed Treatment Wetlands, Katlyn Edwards 2019 Rose-Hulman Institute of Technology

Investigating The Removal Of Stormwater Pollutants In Small-Scale, Constructed Treatment Wetlands, Katlyn Edwards

Rose-Hulman Summer Undergraduate Research Fellowships

Eutrophication of US surface waters is a growing problem due to nitrogen and phosphorus runoff in stormwater. In natural ecosystems, wetlands can absorb and remove a variety of water pollutants, including nutrients. Wetlands also provide flood control and wildlife habitat. Mimicking natural systems, constructed treatment wetlands can remove stormwater pollutants, are economic to build and maintain, provide a bionetwork for a wide range of plants and animals, and can be used for educational purposes.

While constructed treatment wetlands can remove stormwater pollutants such as total suspended solids, organic carbon, and nitrates, a significant reduction in phosphate concentrations has not been ...


Probabilistic Analysis Of Slide-Rocking Structures Under Earthquake Loads, Taylor J. Knickerbocker 2019 University of Nebraska-Lincoln

Probabilistic Analysis Of Slide-Rocking Structures Under Earthquake Loads, Taylor J. Knickerbocker

Civil Engineering Theses, Dissertations, and Student Research

Estimates of rare seismic hazard are essential for the resilience of critical infrastructure and facilities. However, these estimates are highly uncertain at long return periods due to the lack of observed earthquake records. Several ground motion prediction equations have been proposed to close this gap and estimate rare seismic demands; however, these models were developed based on more moderate earthquake records and can yield physically unrealizable ground motions when extrapolated to long return periods. For this reason, seismologists have proposed using precariously balanced rocks (PBRs) as a way to constrain rare seismic hazard. PBRs are a type of fragile geologic ...


Displacement Derived Energy Levels For Harvard Miniature Compaction, Ana Laura Errigo, Julia Loshelder 2019 University of Arkansas, Fayetteville

Displacement Derived Energy Levels For Harvard Miniature Compaction, Ana Laura Errigo, Julia Loshelder

Civil Engineering Undergraduate Honors Theses

Previously, the amount of energy provided by the Harvard Miniature tamper was adjusted by changing the number of blows per lift or the number of lifts or was not adjusted at all. However, this research was conducted to investigate the effect of adjusting the displacement of the spring (increased or decreased) to change the potential energy of the spring and therefore change the compacive effort with a specific type of soil. Thus, the objective was to match the compaction energies using the Harvard miniature method with the compaction energies obtained using the Proctor method. Specifically, the goal was to show ...


Numerical Simulation Of Diffuse Ultrasonic Waves In Concrete, Hossein Ariannejad 2019 University of Nebraska - Lincoln

Numerical Simulation Of Diffuse Ultrasonic Waves In Concrete, Hossein Ariannejad

Civil Engineering Theses, Dissertations, and Student Research

Concrete can be subject to various type of damages. Some damages such as Alkali Silica Reaction (ASR) tend to start from the inside, where there is no easy way to identify or evaluate them in the early stage. The study of ultrasonic waves scatterings in non destructive testing (NDT) methods play a major role in identifying such damages. In an ultrasonic test, high frequency ultrasonic waves are used to interrogate the internal structure of concrete material, where the coarse aggregates and microcracks cause multiple scattering of ultrasonic waves. Experimental studies have demonstrated that diffuse ultrasonic waves scattered by boundaries, coarse ...


Performance Study Of Link Slab Continuity In Prestressed Concrete Bridges, Marco Tulio Canales Jr 2019 Louisiana State University and Agricultural and Mechanical College

Performance Study Of Link Slab Continuity In Prestressed Concrete Bridges, Marco Tulio Canales Jr

LSU Doctoral Dissertations

Link slabs in bridges can be a cost-effective solution to increase the service life of bridge structures. The partial continuity condition in link slab bridges, however can be challenging to quantify. In this work link slab performance is studied by means of a parametric study, a long-term Structural Health Monitoring (SHM) System, and a detailed finite-element model.

The parametric study was conducted using mathematical and a two-dimensional (2D) finite element model. The study considers bridge design factors such as number of spans, span length, span length ratio, girder separation, and temperature settings, in conjunction with the corresponding girder and support ...


Experimental Investigation Of Whitmore Section And Block Shear Failures In Steel Gusset Plates Using Digital Image Correlation, Prajwal Pokhrel 2019 University of Texas,Tyler

Experimental Investigation Of Whitmore Section And Block Shear Failures In Steel Gusset Plates Using Digital Image Correlation, Prajwal Pokhrel

Civil Engineering Theses

Gusset plates are necessary for transferring loads from one structural member to another. During load transfer gussets can undergo shear, net section rupture and gross section yielding. Gusset design is a complex process and there is still a lack of knowledge regarding the stress and strain distribution in gusset plates. Current design practices which use Whitmore method, may not be sufficient to accurately predict the capacity of a gusset plate. An experimental study was conducted at The University of Texas at Tyler to understand the failure mechanism of gusset plates under uniaxial tensile loading. Variables considered for the experiment are ...


Capacitance-Based Sensor With Layered Carbon-Fiber Reinforced Polymer And Titania-Filled Epoxy, Jin Yan, Austin Downey, An Chen, Simon Laflamme, Sammy Hassan 2019 Iowa State University

Capacitance-Based Sensor With Layered Carbon-Fiber Reinforced Polymer And Titania-Filled Epoxy, Jin Yan, Austin Downey, An Chen, Simon Laflamme, Sammy Hassan

Civil, Construction and Environmental Engineering Publications

Advances in intelligent infrastructure can be achieved through the use of novel materials for increased system-level efficiency and multifunctionality. Carbon Fiber-Reinforced Polymer (CFRP) has been widely used in strengthening, rehabilitating, and retrofitting of existing structures because of its speed of deployment, low maintenance requirement, and high strength-to-weight ratio. In this work, the authors propose a novel method to augment CFRP with self-sensing capabilities. The sensor consists of two CFRP layers separated by a titania-filled epoxy dielectric layer, therefore forming a parallel plate capacitor. Sensing capability can be achieved through variations in the sensor’s capacitance provoked by strain, therefore providing ...


Data Sheet For Cone Penetration Test In Soil-Bentonite Cutoff Wall, Jeffrey C. Evans 2019 Bucknell University

Data Sheet For Cone Penetration Test In Soil-Bentonite Cutoff Wall, Jeffrey C. Evans

NSF Soil-Bentonite Slurry Trench Cutoff Wall Datasets

This data sheet shows the measurements taken using a cone penetration test in a soil-bentonite slurry trench cutoff wall. The testing was done following ASTM D 3441.


Quantifying Repeatability Reproducibility Sources Of Error And Capacity Of A Measurement: Demonstrated Using Laboratory Soil Plasticity Tests, Cheng Li, Jeramy C. Ashlock, Xuhao Wang 2019 Chang’an University

Quantifying Repeatability Reproducibility Sources Of Error And Capacity Of A Measurement: Demonstrated Using Laboratory Soil Plasticity Tests, Cheng Li, Jeramy C. Ashlock, Xuhao Wang

Civil, Construction and Environmental Engineering Publications

The repeatability, reproducibility, and sources of error inherent in a given measurement are important considerations for potential users. To quantify errors arising from a single operator or multiple laboratories, most testing standards uses a one-way analysis of variance- (ANOVA-) based method, which utilizes a simple standard deviation across all measurements. However, this method does not allow users to quantify the sources of error and capacity (i.e., the precision to tolerance ratio). In this study, an innovative two-way ANOVA-based analysis method is selected to quantify the relative contributions of different sources of error and determine whether a measurement can be ...


Valuation Of Flexibility And Investment Timing In Airport Infrastructure Projects: Cases In Airport Expansions And Alternate Design Alternate Bid Bidding, Ilker Karaca 2019 Iowa State University

Valuation Of Flexibility And Investment Timing In Airport Infrastructure Projects: Cases In Airport Expansions And Alternate Design Alternate Bid Bidding, Ilker Karaca

Ilker Karaca

Many large infrastructure projects are subject to considerable uncertainty over their revenue streams which makes their valuations particularly challenging. When project scalability can be altered as new information is revealed over the course of a project’s lifecycle, the presence of uncertainty can, in fact, provide option values that are ignored with static Net Present Value (NPV) analyses. To achieve these benefits, however, a better understanding of volatility is of the essence. This dissertation seeks to demonstrate how a better understanding of the business risks could facilitate the valuation of flexibility options in investment timing and engineering design. It also ...


Field Performance And Cost Effectiveness Of Crack Sealing In Flexible And Composite Pavements, Momen Ragab Mousa 2019 Louisiana State University and Agricultural and Mechanical College

Field Performance And Cost Effectiveness Of Crack Sealing In Flexible And Composite Pavements, Momen Ragab Mousa

LSU Doctoral Dissertations

Surface cracking is one of the major surface distresses in asphalt concrete (AC) pavement, allowing water infiltration through the cracks, causing stripping in asphalt pavement layers, and weakening and deteriorating the base and/or subgrade. Its treatment, therefore, is one of the major activities in pavement preservation for many state DOTs. Among the various treatment methods currently available to preserve AC pavement with existing surface cracking are various forms of crack sealing. Crack sealing is not a common practice to Louisiana highways since the benefit of such treatment appears to be affected by the elevation of the ground water table ...


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