Analysis And Design Of A Novel Heavy-Duty Precast Element,
2020
RPS Consulting Engineers and alumnus of the College of Engineering and Informatics, NUI, Galway, Ireland
Analysis And Design Of A Novel Heavy-Duty Precast Element, Daniel Naughton, Michael Naughton, Michael O'Sullivan, Suhaib Salawdeh
Civil Engineering Research in Ireland 2020
Window sills are common to most buildings. In Ireland, concrete is the most popular material used for external sills. A standard one-metre concrete window sill weighs about 70kg. While external window sills are required to have sufficient capacity to resist damage during transportation and loading, they are non-structural elements. Therefore, there is no need for their high selfweight. This project looks to redesign concrete window sills to make them lighter. Decreasing the amount of concrete used in each sill would significantly reduce their self-weight. This would make concrete window sills more manageable in terms of transportation and installation. Two design …
Development And Localisation Of Ultra High Performance Concrete Using A Particle Packing Model,
2020
Roadstone Ltd, Dublin, Republic of Ireland; Department of Civil Engineering & Construction, Institute of Technology Sligo, Republic of Ireland
Development And Localisation Of Ultra High Performance Concrete Using A Particle Packing Model, William Wilson, Tomas O'Flaherty
Civil Engineering Research in Ireland 2020
Ultra-high performance fibre reinforced concrete (UHPFRC) is used worldwide to improve the structural performance of infrastructure such as bridges, extend their working life and reduce environmental impact. As a result thinner structures are constructed leading to reductions in the structure’s self-weight and the volume of concrete and natural raw aggregates used in their construction. A drawback to UHPFRC is that it results in a significant rise in initial costs over normal and even high performance concretes, and it has very high binder contents, which in some cases is greater than 1100kg/m3. Therefore, the cost-efficiency and sustainability of this …
Composite Behaviour Of Wide Sandwich Panels With High Performance Concrete Thin Wythes With And Without Thermomass Shear Connectors,
2020
Department of Civil, Structural and Environmental Engineering, Trinity College, Dublin, Ireland
Composite Behaviour Of Wide Sandwich Panels With High Performance Concrete Thin Wythes With And Without Thermomass Shear Connectors, Jagoda Lipczynska, Roger P. West, Michael Grimes, Dervilla Niall, Oliver Kinnane, Richard Hegarty
Civil Engineering Research in Ireland 2020
To partly address the future sustainability of energy use in buildings, there is a program in Europe to retrofit domestic and commercial buildings with non-load bearing insulated re-cladding and over-cladding panels. Recent research work has shown that limited composite action is possible depending on the type of non-conductive shear connector and the stiffness of the insulation between the inner and outer wythes. This paper reports on the mix design development to develop high strength 20mm thick wythes and the manufacture of sandwich panels with five silicone-bonded layers of XPS insulation, making up a panel which is 220mm thick. These model …
Influence Of Aggregates In Concrete On Fiber-Optic Based Thermal Integrity Profiling Analysis Of Concrete Structures,
2020
Missouri University of Science and Technology
Influence Of Aggregates In Concrete On Fiber-Optic Based Thermal Integrity Profiling Analysis Of Concrete Structures, Ruoyu Zhong, Wen Deng
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Fiber-optic sensor has drawn wide attention in the non-destructive testing and evaluation of civil engineering materials due to its high accuracy and resolution as well as cost-efficiency. Currently, using optical fiber as the temperature sensor is proposed to conduct the thermal integrity profiling (TIP) of concrete structures. However, concrete is not a thermally homogeneous material as assumed in current studies of concrete TIP. Its essential components, such as aggregates may cause thermal inhomogeneity problems when implementing fiber-optic sensors for TIP. In this paper, we use the concrete structures with different grades of aggregates to conduct numerical simulation for non-destructive thermal …
Resonance Of Droplets In Constricted Capillary Tubes: Critical Factors And Nonlinearity,
2020
Missouri University of Science and Technology
Resonance Of Droplets In Constricted Capillary Tubes: Critical Factors And Nonlinearity, Chao Zeng, Wen Deng, M. Bayani Cardenas
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Resonance of droplets in constricted capillary tubes responding to external vibratory excitation can be theoretically characterized by the abstract coefficients such as resonant frequency and rate of damping. A physically sound model, however, is needed to relate these abstract coefficients to the fluid properties of two-phase fluid, geometric properties of tube, and features of excited waves. A hydrodynamic model, based on the moving-boundary control volume concept and the transient oscillatory velocity profile, was developed to characterize the resonance of droplets. This model was validated against computational fluid dynamics simulation results expressed in both time and frequency domains. Dominant factors including …
Three-Dimensional (3d) Characterization Of The Middle Ordoovician (Darriwilian) Strata In The Southern Great Basin, Western United States,
2020
University of Nevada, Las Vegas
Three-Dimensional (3d) Characterization Of The Middle Ordoovician (Darriwilian) Strata In The Southern Great Basin, Western United States, Uday Mohamed Baheej Kara Ali
UNLV Theses, Dissertations, Professional Papers, and Capstones
Carbonates are mostly produced in shallow-marine environments and their deposition is sensitive to water depth changes on carbonate platforms. The water depth in depositional environments of a particular carbonate platform is controlled by the interplay of eustatic sea-level change, tectonic subsidence, platform morphology, and depositional rate. Due to the morphological variations of carbonate platforms in different tectonic settings, facies distribution across carbonate platforms varies significantly even during a single eustatic sea-level cycle. Carbonate platforms developed on passive continental margins are thought to be the most stable platforms and their facies distribution is commonly taken as examples in textbook depositional models. …
Relating Asphalt Concrete’S Pore Structure To Its Durability,
2020
University of New Mexico
Relating Asphalt Concrete’S Pore Structure To Its Durability, Mohiuddin Ahmad
Civil Engineering ETDs
Most of the pavements in the USA are constructed using asphalt concrete (AC). AC changes its property over time due to moisture intrusion and aging. These two factors deteriorate AC significantly, and they are considered as the most important durability measures of AC. Moisture enters a pavement in both liquid and vapor form through the permeable pores that are interconnected. Similarly, oxygen, which is required for the aging process, access an asphalt concrete pavement through the connected pore. However, none of the previous studies correlated AC’s pore structure to the flow of moisture, moisture damage, and aging. In this study, …
Remediation Of Desiccation Cracking In Clayey Soils Through Bio-Cementation And Bottom Ash,
2020
Rowan University
Remediation Of Desiccation Cracking In Clayey Soils Through Bio-Cementation And Bottom Ash, Mark Vail
Theses and Dissertations
Desiccation cracking considerably impairs the hydraulic and mechanical properties of clayey soils and is critical to the long-term performance of infrastructure foundations and earth structures. Classical crack remediation methods are associated with high labor and maintenance costs or the usage of environment-unfriendly chemicals. Recycling waste materials and developing bio-mediated techniques have emerged as green and sustainable soil stabilization solutions. The objective of this study is to investigate the feasibility of soil crack remediation through the usage of microbial-induced calcite precipitation (MICP) and bottom ash admixtures. We carry out monotonic drying and cyclic drying-wetting tests to characterize the effects of bottom …
A Comparison Of Half And Quarter Space Penetration Into Granular Media,
2020
CUNY New York City College of Technology
A Comparison Of Half And Quarter Space Penetration Into Granular Media, Ivan L. Guzman, Magued Iskander, Stephan Bless
Publications and Research
In this study, two experimental techniques are compared for the purpose of visualizing projectile penetration at speeds ranging between 60 and 150 m/s into granular media. The two techniques are half space penetration into a transparent synthetic soil surrogate and quarter space penetration of an opaque natural sand and transparent soil surrogate against an observation window. In both techniques a pneumatic projectile accelerator was employed to launch the projectiles, and high-speed imagery was employed to visualize the penetration events unintrusively. Transparency in transparent targets was achieved by saturating angular fused quartz with a refractive index matched pore fluid made of …
Comminution Characteristics Of Lithium Bearing Mica Ores From Different Devices,
2020
University of Dar es Salaam, School of Mines and Geosciences, Department of Mining and Mineral Processing Engineering, P.O. Box 35131, Dar es Salaam, Tanzania
Comminution Characteristics Of Lithium Bearing Mica Ores From Different Devices, Alphonce Wikedzi
Tanzania Journal of Engineering and Technology (TJET)
This paper highlights on the comminution and to the lesser extent liberation properties of two greisen-type lithium bearing-mica ores (L1, L2) subjected to different breakage devices; cone crusher (CC), roller crusher (RC), rotor beater mill (RBM) and a screen mill (SM). The particle size distributions (PSD) of the products from each device were evaluated to search for an appropriate PSD model using Gates-Gaudin-Schuhmann (GGS) and Rosin-Rammler (RR) functions. To determine an appropriate function, coefficients of determination (R2) were used as a criterion. Due to budget constraint, only products from rotor beater mill (RBM) were examined for mineral liberation by an …
Evaluating Cracking Performance Of Polymer Enhanced And Fiber Reinforced Microsurface Mixtures Using Asphalt Laboratory Testing,
2020
Rowan University
Evaluating Cracking Performance Of Polymer Enhanced And Fiber Reinforced Microsurface Mixtures Using Asphalt Laboratory Testing, George Joseph Shackil
Theses and Dissertations
This study presents a method to improve and evaluate the cracking resistance of microsurfacing mixtures using common asphalt laboratory testing. A preliminary optimal timing study and a study to evaluate improvements to cracking performance were conducted. The control mixture was based on NJDOT standard mix design specifications. Three mixtures were tested in this study: a fiber reinforced mixture using one-quarter inch glass fibers, an emulsion with increased SBR (polymer) contents, and a mixture using the one-quarter inch glass fibers combined with the increased polymer contents. Three laboratory tests were used to evaluate three different cracking resistance parameters: crack initiation (Semi-Circular …
Numerical Analyses Of Pile Foundation For Support Structure Of Offshore Wind Turbine At Changhua Coast In Taiwan,
2020
Department of Soil and Water Conservation, National Chung Hsing University, Taichung, Taiwan, R.O.C
Numerical Analyses Of Pile Foundation For Support Structure Of Offshore Wind Turbine At Changhua Coast In Taiwan, Der-Guey Lin, Sheng-Hsien Wang, Jui-Ching Chou, Cheng-Yu Ku, Lien-Kwei Chien
Journal of Marine Science and Technology–Taiwan
This study investigates the bearing capacities of group pile foundation (jacket foundation) installed on the seabed of offshore wind farm (OWF) at the Changhua coast of Western Taiwan for the jacket support structure of offshore wind turbine (OWT) using three-dimensional (3-D) finite element method (FEM). The jacket foundations are subjected to a combined Vertical-Horizontal-Moment (V-H-M) loading for the operational period. The responses of installed group pile foundations are investigated under the combined loading in marine silty sand-low plasticity silt & clay (SM-ML-CL) layers determined by 19 offshore boring logs. The validity of numerical procedures was verified by a large-scale lateral …
Study Of The Effect Of Heating - Cooling Cycles On The Clay - Concrete Pile Interface Characteristics,
2020
Louisiana State University and Agricultural and Mechanical College
Study Of The Effect Of Heating - Cooling Cycles On The Clay - Concrete Pile Interface Characteristics, Abedalqader Ahmad Idries
LSU Master's Theses
This study aimed at investigating the effect of heating-cooling cycles on the interface strength parameters of clay soil-concrete for potential applications to improve the side capacity of piles driven in clayey soil by the heating process, and also to assess the behavior of geothermal piles regarding interface shear strength parameters. A modified large-size direct shear test device with the dimensions 12” x 12” x 8”, was used in this study. A concrete block (12” x 12” x 4”) of similar texture and smoothness to the concrete piles was used to simulate the pile interface. The tested clays are low plasticity …
Evaluation Of Undrained Shear Strength Of Soil, Ultimate Pile Capacity And Pile Set-Up Parameter From Cone Penetration Test (Cpt) Using Artificial Neural Network (Ann),
2020
Louisiana State University
Evaluation Of Undrained Shear Strength Of Soil, Ultimate Pile Capacity And Pile Set-Up Parameter From Cone Penetration Test (Cpt) Using Artificial Neural Network (Ann), Md Ariful Hassan Mojumder
LSU Master's Theses
Over the years, numerous design methods were developed to evaluate the undrained shear strength, Su, ultimate pile capacity and pile set-up parameter, A. In recent decades, the emphasis was given to the in-situ cone and piezocone penetration tests (CPT, PCPT) to estimate these parameters since CPT/PCPT has been proven to be fast, reliable and cost-effective soil investigation method. However, because of the paucity of a vivid comprehension of the physical problem, some of the developed methods incorporate correlation assumptions which might compromise the consistent accuracy. In this study, the Artificial Neural Network (ANN) was exerted using CPT data …
Forecasting The Gas Fluiding Process Deposits With Application Of The Universal Regression Model,
2020
Mining and Metallurgical Institute of Tajikistan, Buston, Tajikistan
Forecasting The Gas Fluiding Process Deposits With Application Of The Universal Regression Model, Sh.Zh. Mirboboev, Z.A. Razykov, S.K. Sokhoshko, Yu. Sultonov
Gorniy vestnik Uzbekistana
This article discusses mathematical methods for predicting the degree of flooding of gas deposits using the Universal regression model, using the example of actual data from observation wells of the Yamburgskoye oil and gas condensate field.
2-D Non-Linear Finite Element Analysis Of Folsom Dam: Seismically Induced Separation And Pore Pressure Along The Soil-Concrete Interface,
2020
Kennesaw State University
2-D Non-Linear Finite Element Analysis Of Folsom Dam: Seismically Induced Separation And Pore Pressure Along The Soil-Concrete Interface, Grace Amoussou
Master of Science in Civil Engineering Theses
The seismic soil-concrete interface stability of composite dams has been an area of interest to many researchers. However, the true interface behavior during a seismic event has not been well understood. During a ground shaking, bonding and de-bonding action along the interface may cause significant separation of soil and concrete surfaces, and such a separation may take place at any depth along the interface creating a stability concern for the overall dam. Moreover, the repetitive nature of bonding/debonding behavior may induce excess pore pressure along the interface, which in turn, may trigger a liquefaction failure or a hydraulic fracture in …
Development Of Vs Profiles And Site Periods In The Mexico City Basin,
2020
University of Arkansas, Fayetteville
Development Of Vs Profiles And Site Periods In The Mexico City Basin, Landon Joel Woodfield
Graduate Theses and Dissertations
This study presents dynamic site characterization measurements at 25 sites within the Mexico City Basin. The primary focus of the testing was along the western edge of the Mexico City Basin. At each site, active source Multi-channel Analysis of Surface Waves (MASW) arrays and passive source Microtremor Array Measurements (MAM) L-arrays and circular arrays were used to acquire dispersion data. Horizontal to Vertical Spectral Ratio (HVSR) data was collected to determine site periods at each location. These experimental dispersion data and site periods were fit using a joint inversion of Rayleigh and Love wave dispersion data and HVSR site period …
Development Of Multi-Axial Fatigue Retrofits For Lock Gate Components,
2020
University of Arkansas, Fayetteville
Development Of Multi-Axial Fatigue Retrofits For Lock Gate Components, Logan Verkamp
Graduate Theses and Dissertations
Lock gates are essential infrastructure components to the United State (US) supply chain. They create large cost savings and environmental benefits when compared with traditional methods of transport (freight and rail). Because of the large quantity of goods and dependence on these shipping chains, the US economy can be drastically affected by an unexpected gate closure. Unfortunately, many lock gates within the US have reached or exceeded their designed life. Due to the intensity of cyclic loads and the environment, fatigue cracks have become a prominent issue. Developed cracks near the pintle region (a joint which the gate rotates and …
Impact Of Compactive Effort On Soil Strength Of Glacial Lake Columbia Soils,
2020
Eastern Washington University
Impact Of Compactive Effort On Soil Strength Of Glacial Lake Columbia Soils, Alexander M. Navarra, Dwight Hendrickson, Jaremy Shaw
2020 Symposium Posters
Glacial Lake Columbia (GLC) existed from 15,550 (+/- 450) to 13,050 (+/- 650) years ago (Atwater, 1986) as a result of the Okanagan Lobe of the Cordilleran Ice Sheet damming the Columbia River near present-day Grand Coulee Dam. The lake deposited a fine-grained basal layer that had interbeds of coarse Missoula Flood deposits and later lake deposits above. Because these GLC deposits are present around most of the Spokane area, they are important to civil engineering and development. We sampled the basal layer of GLC soils from the Peone Prairie, WA. We performed prerequisite testing before the main experiment, with …
Preliminary Investigation Of Required Bsca Amount For Soil Cement Mixtures,
2020
University of Arkansas, Fayetteville
Preliminary Investigation Of Required Bsca Amount For Soil Cement Mixtures, Mariel Mayori Rivero
Civil Engineering Undergraduate Honors Theses
The recent increase of flooding in the United States and the high expenses related to the damage that these floods have caused to waterway structures suggests a potential interest in rapid setting soil cement to make effective repairs. For this thesis, mix designs of soil only at three different sand-clay proportions were prepared and tested for moisture content and maximum dry density. Due to the early closing of the laboratory and research activities, reliable results were collected from the 70% sand and 30% clay proportions. At those proportions of soil, the optimum moisture content was found to be 8.88% with …
