Incorporating Geopolymer Binders To Fully Utilize Recycled Concrete Aggregates,
2022
Louisiana State University and Agricultural and Mechanical College
Incorporating Geopolymer Binders To Fully Utilize Recycled Concrete Aggregates, Matthew Upshaw
LSU Doctoral Dissertations
This study aims to develop a geopolymer concrete binder that will yield desirable strength and durability characteristics when applied to recycled aggregate concrete. In order to achieve this, a geopolymer binder consisting of a metakaolin-silica fume aluminosilicate source material blend activated by potassium-based alkaline solutions is developed and used in place of ordinary Portland cement (OPC) with four different levels of recycled aggregate replacement ratios. The properties of these concretes were analyzed and compared with the properties of OPC concretes produced with the same replacement ratio levels. The results showed that the geopolymer recycled aggregate concrete (GRAC) achieved greater than …
Experimental Performance Evaluation Of A Convective Thermoelectric Building Envelope For Building Heating And Cooling,
2022
Purdue University
Experimental Performance Evaluation Of A Convective Thermoelectric Building Envelope For Building Heating And Cooling, Xiaoli Liu, Kazuaki Yazawa, Ming Qu, Orkan Kurtulus, Brian Norton, Niall Holmes Dr., Ruchita Jani, Jorge Kohanoff, Lorenzo Stella, Conrad Johnston, Hongxi Yin
Articles
The thermoelectric building envelope (TBE) integrates thermoelectric materials with the building envelope for active space heating and cooling. The advantage of TBE heating and cooling includes its significantly low-profile design and no refrigerant use. Although there are existing studies evaluating TBE performance, they were based on limited operating conditions. The study aims to experimentally evaluate the heating and cooling performance of a TBE prototype under various operating conditions. The TBE prototype was installed between two psychrometric chambers, which simulated indoor and outdoor conditions. The prototype was tested at an indoor temperature of around 22.35–23.58 degrees C and outdoor temperatures from …
Evaluation Of Flood Damage On Cross Laminated Timber Wall Configurations,
2022
Mississippi State University
Evaluation Of Flood Damage On Cross Laminated Timber Wall Configurations, Mustafa Nezih Kaya
Theses and Dissertations
Greenhouse gas emissions are one of the critical factors that affect climate change, increasing flooding risk and threatening human life. The use of traditional construction materials is responsible for a higher percentage of global greenhouse gas emissions when compared to the use of sustainable materials in the construction industry. The substitution of current building materials with sustainable materials is essential to reduce greenhouse gas emissions and positively influence climate change when the current construction demand in the world is considered. Wood is one of the primary environmentally friendly construction materials in regard to high carbon storage and low carbon emissions. …
Mechanical Responses Of Soil-Geosynthetic Composite (Sgc) Mass Under Failure Load,
2022
National Taipei University of Technology
Mechanical Responses Of Soil-Geosynthetic Composite (Sgc) Mass Under Failure Load, Meen-Wah Gui, Truc Phan, Thang Pham
Civil Engineering Faculty Publications
There is an increasing awareness on the major benefits of using soil-geosynthetic composite (SGC) to achieve and maintain the stability of earth-filled embankment. Unlike the mechanically stabilized earth wall, the mechanism of the composite mass is still not fully understood. For examples, current analyses have been limited to an SGC mass with a reinforcement spacing Sv of 0.2 m only; the combined effect of reinforcement and backfill properties is rarely studied; the equation for the estimation of the load-carrying capacity of the SGC mass has only been validated for backfill with maximum particle size dmax between 10 mm and 33 …
Effect Of Varying Amounts Of Sandstone On The Performance Of Asphalt Mixtures In Arkansas,
2022
University of Arkansas, Fayetteville
Effect Of Varying Amounts Of Sandstone On The Performance Of Asphalt Mixtures In Arkansas, David Murphy
Graduate Theses and Dissertations
There are many different species and subspecies of aggregate used across the state of Arkansas, and the rest the country. However, it cannot be presumed that the amount and type of these aggregates will be compatible with the commonly used asphalt binder of an area; this can lead to performance issues and premature pavement damage. It has been suspected in Arkansas that an excessive amount of sandstone in asphalt mixtures may be a culprit of some of these premature pavement damage issues, especially regarding the moisture susceptibility of a pavement. This study aimed to analyze the performance effects of using …
Development Of Deep Shear Wave Velocity Profiles And An Approach To Generate Site Signature Consistent Pseudo Shear Wave Velocity Profiles In The Mississippi Embayment,
2022
University of Arkansas, Fayetteville
Development Of Deep Shear Wave Velocity Profiles And An Approach To Generate Site Signature Consistent Pseudo Shear Wave Velocity Profiles In The Mississippi Embayment, Ashraf Kamal Himel
Graduate Theses and Dissertations
This dissertation details the development of a surface wave method (SWM) technique to generate deep shear wave velocity profiles (VS profiles), applying this technique at 24 sites across the Mississippi embayment and developing an approach to generate pseudo site signature consistent VS profiles from velocity functions and fundamental frequency. In the presented SWM technique, active and passive source surface wave measurements are inverted along with fundamental frequency to develop a site signature consistent VS profile. Multiple transformation methods, including MSPAC, HRFK and FK are used to resolve experimental dispersion data from surface wave measurements. SWM VS profile at the Central …
Investigations Into Flange Surface Friction Effects On Shear Stud Load Transfer In Composite Bridge Girders,
2022
University of Arkansas, Fayetteville
Investigations Into Flange Surface Friction Effects On Shear Stud Load Transfer In Composite Bridge Girders, Callie Clark
Graduate Theses and Dissertations
Composite bridge behavior is commonly achieved through headed shear studs welded tothe steel girder flange and embedded in the concrete deck. Current AASHTO provisions for estimating demands on shear studs during service-level loading consider only bearing load transfer, neglecting adhesion bonding and friction load transfer between the concrete deck and girder flange. Quantifying alternative load transfer mechanisms across the steel-concrete interface may result in improved steel bridge economy by reducing the number of studs required in a composite girder design. This study investigates the effects of flange surface friction (considering various coatings) on resulting stud demands using both experimental testing …
Initial Exploration Of Reduced Gyrations For Arkansas Asphalt Mix Designs,
2022
University of Arkansas, Fayetteville
Initial Exploration Of Reduced Gyrations For Arkansas Asphalt Mix Designs, Jocie L. Baker
Graduate Theses and Dissertations
The most common distresses in asphalt pavement are cracking and rutting. These distresses plague almost every asphalt roadway in the world. Finding ways to mitigate these distresses will improve the performance of asphalt pavements. One way to combat the premature cracking of asphalt in the field is to ensure there is enough asphalt binder within the mix. This will help the flexibility of the asphalt undergoing large loads and deformation. However, it is widely accepted that mix designs across the country lack the appropriate amount of asphalt binder in their mixes, causing dry mix designs that are subject to cracking …
Multisorb: A Low-Cost Approach To Remove Multiple Metals And Organics From Leachate And Wastewater,
2022
University of Texas at Arlington
Multisorb: A Low-Cost Approach To Remove Multiple Metals And Organics From Leachate And Wastewater, Mithila Chakraborty
Civil Engineering Dissertations - Archive
ABSTRACT: Landfill leachates are considered now as a reusable source of water. Even irrigation projects are now considering use of non-traditional water sources, including treated wastewater, to augment supplies. Treated wastewater or leachate, however, may still contain many inorganic and organic pollutants of emerging concern, because traditional wastewater treatment plants are unable to remove all of them. Adsorbents have been demonstrated to effectively remove heavy metals and recalcitrant organics from leachate/wastewater more effectively, at lower cost, and using less chemicals and energy than many competing techniques. A single adsorbent with one pre-treatment, however, is not effective for simultaneously removing different …
Design Of Crack Attenuating Mix Using Waste Plastic,
2022
University of Texas at Arlington
Design Of Crack Attenuating Mix Using Waste Plastic, Shruti Singh
Civil Engineering Dissertations - Archive
Plastic has many good properties such as inexpensiveness, light weightedness and durability, but it comes with one major catch i.e., its ‘indestructibility’. Plastic waste is now omnipresent and highlights that all plastic ever produced still exists in some shape or form either as macro, micro or nano plastics, making it one of the greatest challenges our planet is facing today. At the same time many existing pavements are experiencing structural and functional deficiencies due to rapid growth in traffic volume. This has led to an ever-increasing rise in construction and rehabilitation cost. So, an alternative has been explored through this …
Identifying The Optimal Combination Of Critical Roadside Slope Segments Susceptible To Rainfall-Induced Failures For Minimizing Vulnerability Of Highway Networks,
2022
University of Texas at Arlington
Identifying The Optimal Combination Of Critical Roadside Slope Segments Susceptible To Rainfall-Induced Failures For Minimizing Vulnerability Of Highway Networks, Anil Baral
Civil Engineering Dissertations - Archive
The stability of roadside slopes is vital for the smooth operation of the highway transportation system. The failure of slopes adjacent to the highway corridors adversely impacts the network users and network operators. The network users are subjected to delays through speed restrictions, stoppage, and diversions due to the blockage of a motorway. The network operators face the burden of implementation and finance of emergency slope repairs. Proactive rehabilitation of slopes helps to reduce roadside slope failures and minimize the disruption of transportation networks resulting from rainfall-induced slope failures. However, all the slope segments susceptible to rainfall-induced failures cannot be …
Experimental Study Of Flow Characteristics And Geometry Of Scour Hole Around Cylindrical Piers Subject To Wave And Current,
2022
University of Texas at Arlington
Experimental Study Of Flow Characteristics And Geometry Of Scour Hole Around Cylindrical Piers Subject To Wave And Current, Qazi Ashique E Mowla
Civil Engineering Dissertations - Archive
This thesis concerns the unique flow structure around bridge piers under the wave and current conditions. The flow characteristics around piers may change depending on the flow conditions and geometry of the pier. These flow structures imprint themselves on the streambed as scour holes. Laboratory experiments were conducted to investigate the changes that occur in the flow pattern and in the geometric pattern of scour holes around piers in waterbodies subject to waves and currents. Physical models of two piers with different diameters (19 mm and 50 mm) were built and installed in a sediment bed. A total of 19 …
Integrating Environmental Contamination Perceptions Of Artisanal And Small-Scale Mining Into Environmental Responses Across Spatial Scales,
2022
University of Texas at Arlington
Integrating Environmental Contamination Perceptions Of Artisanal And Small-Scale Mining Into Environmental Responses Across Spatial Scales, Michelle Schwartz
Civil Engineering Dissertations - Archive
ABSTRACT: Artisanal and small-scale gold mining (ASGM) is of significant interest to the international research community, government officials, and non-governmental organizations due to its large environmental footprint and its presence in over 70 countries worldwide. Despite the health and environmental concerns associated with mercury use in ASGM and the increased awareness at the international level, attempts to address environmental contamination has faced resistance as they often fail to account for the real-world conditions at sites of concern. Additionally, national and international interventions have fallen short when addressing ASGM pollution, calling for a new engineering approach towards ASGM-related projects. The purpose …
Development Of Multi Criteria Decision-Making Model To Evaluate The Adoption Effectiveness Of Electronic Ticketing (E-Ticketing) In Highway Construction Projects,
2022
University of Texas at Arlington
Development Of Multi Criteria Decision-Making Model To Evaluate The Adoption Effectiveness Of Electronic Ticketing (E-Ticketing) In Highway Construction Projects, Karthik Subramanya
Civil Engineering Dissertations - Archive
Highway and bridge construction projects are subject to cost and schedule overruns, as well as workforce shortages in remote locations, both of which can result in disputes over the quality of the end product. State departments of transportation (DOTs) are constructing and managing more highway projects than ever before despite limited funds and a shortage of inspectors. The construction of highway infrastructure has devoted significant resources towards e-Construction to reduce the paperwork and automate the tasks in daily operations. Electronic Ticketing (e-Ticketing) is one such component of e-Construction that aids in the digital transfer of material tickets such as asphalt …
Experimental Study Of Flow Characteristics And Geometry Of Scour Hole Around Cylindrical Piers Subject To Wave And Current,
2022
University of Texas at Arlington
Experimental Study Of Flow Characteristics And Geometry Of Scour Hole Around Cylindrical Piers Subject To Wave And Current, Qazi Ashique E Mowla
Civil Engineering Theses - Archive
This thesis concerns the unique flow structure around bridge piers under the wave and current conditions. The flow characteristics around piers may change depending on the flow conditions and geometry of the pier. These flow structures imprint themselves on the streambed as scour holes. Laboratory experiments were conducted to investigate the changes that occur in the flow pattern and in the geometric pattern of scour holes around piers in waterbodies subject to waves and currents. Physical models of two piers with different diameters (19 mm and 50 mm) were built and installed in a sediment bed. A total of 19 …
Sustainable And Inclusive Engineering: The Use Of Mentors And Sustainable Remediation To Increase The Presence Of Underrepresented Groups In Engineering,
2022
University of Texas at Arlington
Sustainable And Inclusive Engineering: The Use Of Mentors And Sustainable Remediation To Increase The Presence Of Underrepresented Groups In Engineering, Nathaniel L. Steadman
Civil Engineering Theses - Archive
The recruitment and retention of underrepresented groups in engineering, such as women, has been a priority for many decades to diversify the profession to meet the current demand for engineers. Unfortunately, barriers continue to inhibit the recruitment and retention of underrepresented students in engineering, thus reducing the impact of these efforts. A potential barrier is a lack of social connection to the technical problem definition, design, and decision-making that engineers utilize, prioritizing technical knowledge over social. Previous research has theorized that the incorporation of social considerations in technical engineering design increases interest in engineering for underrepresented groups. The purpose of …
An Experimental Investigation Of Icephobicity And Hydrophobicity Of Concrete Surface Treated With Pavix,
2022
University of Texas at Arlington
An Experimental Investigation Of Icephobicity And Hydrophobicity Of Concrete Surface Treated With Pavix, Hussein Hashemi Senejani
Civil Engineering Theses - Archive
High ice adhesion is a significant problem in several industries. The majority of practical issues brought on by ice adhesion are still not fully resolved, and the ice-adhesion mechanism is still poorly understood. Ice adhesion is a complex phenomenon that becomes more intricate when salt is involved, as in many marine cases. Reducing ice adhesion by generating hydrophobic surfaces might be advantageous in many applications as a passive ice removal strategy. Lowering adhesion may reduce friction, abrasion, and damage to structures in a maritime environment, as well as any surface prone to ice development. This process may also be utilized …
Thermal Properties Of Water Repellent Sands: Experimental And Theoretical Evaluation,
2022
University of Texas at Arlington
Thermal Properties Of Water Repellent Sands: Experimental And Theoretical Evaluation, Gang Lei
Civil Engineering Dissertations - Archive
ABSTRACT: Unsaturated hydrophobic soils, induced by the decomposition of plant roots or chemical or oil contamination et al., may have potentially negative effects on soil thermal behaviors and further influence the performance of shallowly buried energy systems, including ground heat exchangers, borehole energy geo-storage systems, and buried power cable systems, etc. This research focused on the fundamental understanding of soil thermal behaviors in relation to surface wettability. Surface wettability alteration was conducted in the laboratory by applying dimethyldichlorosilane (DMDCS) on dry sands, which generated a thin hydrophobic layer on the sand particle surface. Several surface characterizations using scanning electron microscopy …
A Sustainable And Equitable Transportation System Design Under Connected Vehicle And Big Data Driven Environment,
2022
University of Texas at Arlington
A Sustainable And Equitable Transportation System Design Under Connected Vehicle And Big Data Driven Environment, Farzana Rahman Chowdhury
Civil Engineering Dissertations - Archive
As the population increases day by day, several cities are having trouble dealing with the increasing demand for a sustainable and equitable transportation system. At the same time, application of newer technology is also increasing . By definition, a sustainable transportation system indicates a method that includes the needs of each individual road user and mode of transportation. A sustainable transportation system also supports the compatibility of the system with the change in demand, regional development, and available resources. In a sustainable and equitable transportation system, integrating the virtual world and the physical world is crucial since it makes the …
Model Development For User Behavior While Adopting Autonomous Vehicles As Their On-Demand Transportation Mode,
2022
University of Texas at Arlington
Model Development For User Behavior While Adopting Autonomous Vehicles As Their On-Demand Transportation Mode, Ronik Ketankumar Patel
Civil Engineering Dissertations - Archive
Shared autonomous vehicles (SAVs) are a new technology that allows passengers to skip hailing a cab using a smartphone app to summon an autonomous shuttle that does not require a human operator. SAVs are anticipated to improve the efficiency, mobility, safety, and affordability of transportation systems. However, consumers will determine the success of SAV technology. Researchers have studied the associations between individuals' attitudes, preferences, and adoption of self-driving services focusing mainly on potential riders with no actual ridership experience. However, the literature lacks empirical assessments of riders' adoption and acceptance of SAVs. Therefore, this study aims to develop two models …
