Winter Maintenance On The Irish Road Network,
2020
School of Engineering and Design, Institute of Technology, Sligo, Ireland
Winter Maintenance On The Irish Road Network, Hugh Mcconnell, Brian Mccann
Civil Engineering Research in Ireland 2020
Winter maintenance relates to those activities undertaken where the objective is to minimise the impact of frost, ice or snow on the travelling public. The responsibility for winter maintenance of all roads in Ireland currently rests with local authorities and Transport Infrastructure Ireland (TII) (Formerly the NRA) on behalf of the Department of Transport, Tourism and Sport (DTTaS), (DTTaS, 2017). The aim of the study was to examine current winter maintenance practices undertaken in Ireland by local authorities and the Motorway Maintenance and Renewals Contracts (MMaRC) contractors and examine the potential financial, operational and environmental benefits if pre-wet and brine …
An Experimental Investigation Of The Optimum Properties And Conditions For Use Of Anionic Emulsions In Road Maintenance Applications,
2020
Dept. of Building & Civil Eng., Galway-Mayo Institute of Technology, Galway Campus, Dublin Road, Galway, Ireland; Chemoran, Deerpark Industrial Estate, Oranmore, Co. Galway, H91 D934, Ireland
An Experimental Investigation Of The Optimum Properties And Conditions For Use Of Anionic Emulsions In Road Maintenance Applications, Simonas Ignatavicius, Alan Kavanagh, David Colleran, Michael J. Brennan, Shane Newell
Civil Engineering Research in Ireland 2020
Bitumen emulsions are used for a range of road maintenance applications, including surface dressing, gravel seals, slurry seals, tack coating, cold-mix asphalt and in situ pavement recycling. The emulsions used can be classified as being either cationic (i.e. possessing a positive electrostatic surface charge) or anionic (i.e. carrying a negative electrostatic surface charge). The vast majority of emulsions used for such applications in Europe are cationic, while anionic bitumen emulsions are used widely throughout North America and Africa. The aims of the experimental study described in this paper were (a) to investigate why one or the other emulsion type is …
A Review Of Vision Based Methods For Pothole Detection And Road Profile Analysis,
2020
Mechanical and Manufacturing Engineering, Queen’s University Belfast, Belfast, Northern Ireland
A Review Of Vision Based Methods For Pothole Detection And Road Profile Analysis, Darragh Lydon, S. E. Taylor, Myra Lydon, Julia Early
Civil Engineering Research in Ireland 2020
This paper is an overview of the development and application of Computer Vision for the detection of pothole, pavement distress and road profile analysis and categorisation. A brief explanation of the traditional methods for determining these factors is given, followed by a chronological description of the evolution and the challenges of using Computer Vision (CV) approaches to determine these conditions. The paper is separated into sections aligned to image capture and analysis methodologies. Qualitative evaluations and comparison of these methods have been provided along with the proposal of guidelines for new computer vision-based road analysis systems.
Analysis And Optimisation Of Tii’S Pams Reset Values And Deterioration Models For Irish Pavement Conditions,
2020
PMS Pavement Management Services Ltd. Raheen Industrial Estate, Athenry, Galway, H65 PD37 Ireland; Department of Civil Engineering, Institute of Technology Sligo, Ash Lane, Sligo, F91 YW50 Ireland
Analysis And Optimisation Of Tii’S Pams Reset Values And Deterioration Models For Irish Pavement Conditions, James Quinn, Raymond Mcgowan, Tomas O'Flaherty
Civil Engineering Research in Ireland 2020
Ireland has a national road network of approximately 5300km that is managed by Transport Infrastructure Ireland (TII). TII create yearly pavement maintenance and renewal programs from the operation of a Pavement Asset Management System (PAMS). Accurate pavement deterioration models and reset values are an essential part of PAMS and are required for life cycle cost analysis (LCCA). Pavement maintenance and renewal schemes are prioritised based on the LCCA's largest benefit to cost ratio, and therefore optimise the annual pavement maintenance and renewal budget. Currently, TII implement pavement deterioration models and reset values from Austria's and Belgium's PAMS, and are not …
An Analysis Of The Effectiveness Of Bitumen Additives On The Performance Of Pavement Surface Dressings,
2020
Department of Civil Engineering, Institute of Technology Sligo, Ash Lane, Sligo, F91 YW50 Ireland; Colas Bitumen Emulsions LTD, Oranmore, Co Galway
An Analysis Of The Effectiveness Of Bitumen Additives On The Performance Of Pavement Surface Dressings, Alan Anderson, John Casserly, Alan Kavanagh, Jim Campbell
Civil Engineering Research in Ireland 2020
Surface dressing is a maintenance technique that uses thin layers of bitumen emulsion and single sized aggregates. The surface dressing process seals and binds the surface of a road to protect its substructure from water ingress. It also provides increased skid resistance, which improves safety for road users. Early life chip-loss can occur if there is an insufficient degree of adhesion between the emulsion and aggregate used. The range of additives used in bitumen can have an effect on their adhesion properties. The focus of this research project was to investigate if the use of these additives in surface dressing …
Winter Maintenance On The Irish Road Network,
2020
School of Engineering and Design, Institute of Technology, Sligo, Ireland
Winter Maintenance On The Irish Road Network, Hugh Mcconnell, Brian Mccann
Civil Engineering Research in Ireland 2020
Winter maintenance relates to those activities undertaken where the objective is to minimise the impact of frost, ice or snow on the travelling public. The responsibility for winter maintenance of all roads in Ireland currently rests with local authorities and Transport Infrastructure Ireland (TII) (Formerly the NRA) on behalf of the Department of Transport, Tourism and Sport (DTTaS), (DTTaS, 2017). The aim of the study was to examine current winter maintenance practices undertaken in Ireland by local authorities and the Motorway Maintenance and Renewals Contracts (MMaRC) contractors and examine the potential financial, operational and environmental benefits if pre-wet and brine …
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, …
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 …
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 …
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 …
