Quality Improvement Of Acidic Soils By Biochar Derived From Renewable Materials,
2017
Chosun University
Quality Improvement Of Acidic Soils By Biochar Derived From Renewable Materials, Deok Hyun Moon, Inseong Hwang, Yoon-Young Chang, Agamemnon Koutsospyros, Kyung Hoon Cheong, Won Hyun Ji, Jeong Hun Park
Civil Engineering Faculty Publications
Biochar derived from waste plant materials and agricultural residues was used to improve the quality of an acidic soil. The acidic soil was treated for 1 month with both soy bean stover-derived biochar and oak-derived biochar in the range of 1 to 5 wt% for pH improvement and exchangeable cation enhancement. Following 1 month of treatment, the soil pH was monitored and exchangeable cations were measured. Moreover, a maize growth experiment was performed for 14 days with selected treated soil samples to confirm the effectiveness of the treatment. The results showed that the pH of the treated acidic soil increased …
The Effect Of Plant Water Storage On Water Fluxes Within The Coupled Soil–Plant System,
2017
Duke University
The Effect Of Plant Water Storage On Water Fluxes Within The Coupled Soil–Plant System, Cheng-Wei Huang, Jean-Christopher Domec, Eric J. Ward, Tomer Duman, Gabriele Manolia, Anthony J. Parolari, Gabriel Katul
Civil and Environmental Engineering Faculty Research and Publications
In addition to buffering plants from water stress during severe droughts, plant water storage (PWS) alters many features of the spatio-temporal dynamics of water movement in the soil–plant system. How PWS impacts water dynamics and drought resilience is explored using a multi-layer porous media model.
Multiscale Mechanistic Characterization Of Reclaimed Asphalt Pavements,
2017
Arkansas State University
Multiscale Mechanistic Characterization Of Reclaimed Asphalt Pavements, A. M. Feroze Rashid
Student Theses and Dissertations
The Superpave test methods are based on unmodified asphalt binders and mixes; researchers have reported limitations of these methods in evaluating modified binders. An Atomic Force Microscope (AFM) has the potential to determine morphology and nanomechanistic properties of modified and unmodified asphalt binders. In this study, different amounts of binders recovered from four selected reclaimed asphalt pavements (RAP) are blended with a virgin Performance Grade (PG) binder and tested by following Superpave tests and AFM techniques. Binders with high RAP are found to have more rutting resistance than the virgin binder but less cracking resistance due to their brittleness. Toward …
Performance Evaluation Of Polyphosphoric Acid Modified Asphalt Binders,
2017
Arkansas State University
Performance Evaluation Of Polyphosphoric Acid Modified Asphalt Binders, Istiaque Mahmud
Student Theses and Dissertations
The objective of this study was to find out short- and long-term performance of Polyphosphoric Acid (PPA)-modified asphalt binders. To evaluate the binder performance, mechanistic, chemical and moisture susceptibility tests were done on PPA- and Styrene Butadiene Styrene (SBS)-modified asphalt binders. Mechanistic performance was analyzed by Superpave performance grade testing (AASHTO M 320), whereas chemical analysis was done by Fourier Transform Infrared Spectroscopy (FTIR) analyses and moisture susceptibility was evaluated by Surface Free Energy (SFE) techniques. Superpave testing results suggest that PPA-modified binders are more rutting and fatigue resistant than PG 64-22 binders, but use of Liquid Anti-Stripping Agents (LAA) …
Bond Between Microwave Cured Repair And Concrete Substrate,
2017
Rowan University
Bond Between Microwave Cured Repair And Concrete Substrate, Konstantinos Grigoriadis, P. S. Mangat, Shahriar Abubakri
Henry M. Rowan College of Engineering Departmental Research
The bond strength between a concrete substrate and repair patch is critical to its durability. This paper investigates the effect of microwave curing the freshly applied repair, for 45 min at 132 Watts, on the 28 day bond strength between substrate concrete and different commercial repair materials. The repairs were applied at different ambient temperatures of 20, 10, 2 and −5 °C. Tensile split tests on repaired cube specimens were performed to determine the interfacial bond strength. The ability of microwave curing to prevent the detrimental effects of freezing at early age on the bond and compressive strength of repair …
Design And Implementation
Of The
Manitoba Constrained-Width Tall Wall Barrier,
2017
Manitoba Infrastructure Traffic Engineering
Design And Implementation Of The Manitoba Constrained-Width Tall Wall Barrier, Harald P. Larsen, Scott K. Rosenbaugh, Andrew Pankratz, Diana Emerson, Jennifer Schmidt, Ronald K. Faller, Elizabeth M. Regier
Mid-America Transportation Center: Final Reports and Technical Briefs
Manitoba Infrastructure (MI) desired a new, tall concrete median barrier capable of satisfying the Test Level 5 (TL-5) safety requirements of the Manual for Assessing Safety Hardware (MASH). It needed to fit within the footprint of an existing F-shape median barrier located in a narrow median. It also was required to address headlight glare from opposing traffic. The barrier was designed with a height of 1,250 mm, a maximum width of 600 mm and to resist a load of 845 kN applied at the top of the barrier. The Manitoba Constrained-Width, Tall Wall was optimised to withstand the design load …
System-Dynamics Modeling Of Source Mass-Depletion And Risk-Exposure Evolution For Natural Attenuation Processes In The Vadose Zone,
2017
Stevens Institute of Technology
System-Dynamics Modeling Of Source Mass-Depletion And Risk-Exposure Evolution For Natural Attenuation Processes In The Vadose Zone, Aspasia Kalomoiri, Agamemnon Koutsospyros, Washington Braida, Julius Pavlov
Civil Engineering Faculty Publications
Public health is potentially at risk after a contaminant of concern (COC) is released into the ecosphere. The extent of contamination depends on numerous factors; modeling a contaminant’s dynamic behavior is challenging, given the multitude of relevant parameters and the fluid nature of processes involved. For example, weather events (e.g., wet or dry periods) may affect the mass depletion and the fate and transport of COCs, and hence, the risk assessment of current and potential future exposures. Thus, to give realistic estimates for potential risks, a contaminant’s dynamic behavior must be taken into account in decision-making processes. In this paper, …
A Review Of Approaches To Solving The Problem Of Bim Search: Towards Intelligence-Assisted Design,
2017
Technological University Dublin
A Review Of Approaches To Solving The Problem Of Bim Search: Towards Intelligence-Assisted Design, Hamed Khademi, Avril Behan
Conference papers
Due to the growing adoption of BIM and the rising popularity of cloud computing, BIM models are increasingly stored in central cloud repositories or Common Data Environments. Effective management and exploitation of these models creates the requirement for BIM retrieval systems. Thus far, the BIM industry has utilized general-purpose, text-based search techniques that operate on BIM metadata. This paper highlights the need for a domain-specific BIM search engine and reviews various approaches to address the problem of BIM search. Three main approaches were identified as context-, geometry-, and content-based BIM retrieval. For a comprehensive BIM retrieval system, all three approaches …
Embedding Systems Thinking Into Ewb Project Planning And Development: Assessing The Utility Of A Group Model Building Approach,
2017
University of Colorado Boulder
Embedding Systems Thinking Into Ewb Project Planning And Development: Assessing The Utility Of A Group Model Building Approach, Kimberly Pugel, Jeffrey P. Walters
Faculty Publications - Biomedical, Mechanical, and Civil Engineering
Amongst growing sociotechnical efforts, engineering students and professionals both in the international development sector and industry are challenged to approach projects more holistically to achieve project goals. Engineering service learning organisations must similarly adapt their technological projects to consider varying cultural and economic structures, ensuring more resilient social progress within development efforts. In practice, systems thinking approaches can be utilised to model the social, economic, political, and technological implications that influence the sustainability of an engineering project. This research assesses the utility of integrating systems thinking into Engineers Without Borders (EWB) project planning and development, thereby improving project impact and …
Working With Complexity: A Participatory Systems-Based Process For Planning And Evaluating Rural Water, Sanitation And Hygiene Services,
2017
George Fox University
Working With Complexity: A Participatory Systems-Based Process For Planning And Evaluating Rural Water, Sanitation And Hygiene Services, Jeffrey P. Walters, Kate Neely, Karla Pozo
Faculty Publications - Biomedical, Mechanical, and Civil Engineering
Individuals working within the water, sanitation and hygiene for development (WASH) sector grapple daily with complex technical, social, economic, and environmental issues that often produce unexpected outcomes that are difficult to plan for and resolve. Here we propose a method we are calling the ‘Participatory Systems-based Planning and Evaluation Process’ (PS-PEP) that combines structural factor analysis and collaborative modeling to guide teams of practitioners, researchers, and other stakeholders through a process of modeling and interpreting how factors systemically and dynamically influence sustained access to WASH services. The use and utility of the PS-PEP is demonstrated with a regional team of …
Exercise - Calculate Reservoir Performance Metrics - University Of Colorado Boulder,
2017
University of Colorado Boulder
Exercise - Calculate Reservoir Performance Metrics - University Of Colorado Boulder, Joseph Kasprzyk
All ECSTATIC Materials
No abstract provided.
Gams Handout 1,
2017
Utah State University
Gams Handout 4,
2017
Utah State University
Assessment Of Individual Photovoltaic Module Performance After 26 Years Of Field Exposure At The Telonicher Marine Lab In Trinidad, California,
2017
Humboldt State University
Assessment Of Individual Photovoltaic Module Performance After 26 Years Of Field Exposure At The Telonicher Marine Lab In Trinidad, California, Jake Rada
Projects
In 1990, 192 ARCO M75 photovoltaic (PV) modules were installed as a part of the Schatz Solar Hydrogen Project at the Humboldt State University (HSU) Telonicher Marine Lab in Trinidad, California, within 150 m of the Pacific Ocean. This 9.2 kW-rated PV array was used to power the marine laboratory air compressor and an electrolyzer. Individual current-voltage (IV) curve tests were performed on each of the PV modules prior to the array’s construction in 1990 and again in 2001, 2010, and, most recently, in 2016, following decommissioning of the array. After 25.5 years of use, 188 of the original 192 …
Seismic Evaluation Of 196kv Transformer Bushings,
2017
Portland State University
Seismic Evaluation Of 196kv Transformer Bushings, Joanne R. Shields
Civil and Environmental Engineering Master's Project Reports
Transformer bushings have shown to have an unsatisfactory performance during earthquakes and have therefore been chosen for further testing. How the bushings fail, and how this failure can be prevented has been analyzed. Two used 196 kV bushings made by General Electric were chosen for seismic testing at the iSTAR laboratory located at Portland State University in Portland, OR. The multiple objectives that brought about these tests were: to determine how the bushings failed due to gasket extrusion at the porcelain-flange connection and to verify that the failure was due to pure tipping and not sliding, to determine the damping …
Gams Handout 2,
2017
Utah State University
Gams Handout 3,
2017
Utah State University
Optimizing Fiber Parameters Coupled With Chemical Treatment: Promethee Approach,
2017
King Saud University
Optimizing Fiber Parameters Coupled With Chemical Treatment: Promethee Approach, Arif Ali Baig Moghal, Ateekh Ur Rehman, Bhaskar Chittoori
Civil Engineering Faculty Publications and Presentations
In order to combat issues related to expansive soils, chemical stabilization augmented with use of synthetic fibers is gaining focus in recent times. However, in most of these applications, the practicing field engineers face difficulty in selecting the right mix of fiber size, fiber dosage and stabilizer content. The decision becomes more typical, as the target is to achieve or enhance multiple geotechnical properties which differ with fiber dosage and stabilizer content based on governing mechanisms. Addressing these issues, in this study an attempt is made to present an approach for selecting fibre dosage and lime mix for a typical …
Role Of Ground Glass Fiber As A Pozzolan In Portland Cement Concrete,
2017
Clemson University
Role Of Ground Glass Fiber As A Pozzolan In Portland Cement Concrete, Hassan Rashidian-Dezfouli, Prasad Rao Rangaraju
Publications
Millions of tons of fiberglass are produced annually for a variety of applications. Because of stringent quality requirements and operational characteristics of the manufacturing plants, a significant quantity of fiberglass that does not meet required specifications of the industry ends up as waste in landfills. This study investigated the use of ground glass fiber (GGF) that had been discarded by plants because it did not meet prescribed standards, as a supplementary cementitious material (SCM) for portland cement. Three replacement levels (10%, 20%, and 30% by mass) for portland cement in paste, mortar, and concrete mixtures were studied. Mechanical and durability …
Concrete Pavement Service Condition Assessment Using Infrared Thermography,
2017
Boise State University
Concrete Pavement Service Condition Assessment Using Infrared Thermography, Yang Lu, Aidin J. Golrokh, M.D. Aminul Islam
Civil Engineering Faculty Publications and Presentations
Infrared thermography (IRT), an effective nondestructive testing method, is used to obtain an initial evaluation of the concrete pavement surface and near surface in a time effective manner. In this paper, the effect of the depth of delamination inside concrete pavement on infrared thermography technique is studied for bridge decks inspection. To be able to mimic the delamination in subsurface, two Styrofoam cubes have been inserted in different depth near the surface of the concrete cylinder. After heating up the specimen, thermal images were taken from the surface using an infrared thermal camera to evaluate the effect of subsurface defects …
