Open Access. Powered by Scholars. Published by Universities.®

Civil and Environmental Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

24959 Full-Text Articles 29693 Authors 7487189 Downloads 143 Institutions

All Articles in Civil and Environmental Engineering

Faceted Search

24959 full-text articles. Page 6 of 587.

Streambank Erosion Mapping On The Nottoway River Using Gps-Based Above-Water Video, Emine Fidan 2017 University of Tennessee, Knoxville

Streambank Erosion Mapping On The Nottoway River Using Gps-Based Above-Water Video, Emine Fidan

Pursuit - The Journal of Undergraduate Research at the University of Tennessee

This project concerns the development of streambank erosion maps on military installations utilizing GPS-based above-water video mapping and image georeferencing techniques. The river mapped was the Nottoway River at the Fort Pickett military installation on October 10-11, 2015. Kayak-mounted above-water cameras were utilized to capture georeferenced images of streambank erosion. These GIS-based erosion classifications were utilized to develop erosion maps for determining streambank erosion conditions along the river. Areas of high erosion were identified as about two percent of the river (2167 ft. of streambank length). These maps allow for the opportunity to revisit the sites to determine changes in ...


Methodologies For Designing Railway Plastic And Composite Sleepers, Ruilin You, Erica Andrade Silva, Sakdirat Kaewunruen 2017 China Academy of Railway Sciences

Methodologies For Designing Railway Plastic And Composite Sleepers, Ruilin You, Erica Andrade Silva, Sakdirat Kaewunruen

Sakdirat Kaewunruen


Sleeper is an important component of ballasted track. At present, sleeper is mainly made of wood, steel and concrete. In recent years, because of its good durability, corrosion resistance and easy transportation and laying, plastic and composite sleepers have gradually developed and applied in railway around the world. At present, the plastic and composite sleeper has not yet drawn up the corresponding design standards, only on the basis of engineering experience and related technical guidelines to design. This paper summarizes the service and design condition of different materials sleeper (wooden sleeper, steel sleeper, concrete sleeper and plastic and composite sleeper ...


Probability Of Detection In Structural Health Monitoring, William Q. Meeker 2017 Iowa State University

Probability Of Detection In Structural Health Monitoring, William Q. Meeker

William Q Meeker

Structural Health Monitoring (SHM) is being proposed to replace traditional scheduled NDE inspections. This is raising questions about how to quantify Probability of Detection (POD) and whether the POD statistical methods of MIL-HDBK 1823 can still be used. The answer depends on the application, the nature of the SHM information, and how that information is mapped into a detect/not-detect decision. This talk will outline some of the issues involved in characterizing POD for different kinds of SHM applications.


Damage Detection On Mesosurfaces Using Distributed Sensor Network And Spectral Diffusion Maps, Venkatesh Chinde, Liang Cao, Umesh Vaidya, Simon Laflamme 2017 Iowa State University

Damage Detection On Mesosurfaces Using Distributed Sensor Network And Spectral Diffusion Maps, Venkatesh Chinde, Liang Cao, Umesh Vaidya, Simon Laflamme

Umesh Vaidya

In this work, we develop a data-driven method for the diagnosis of damage in mesoscale mechanical structures using an array of distributed sensor networks. The proposed approach relies on comparing intrinsic geometries of data sets corresponding to the undamaged and damaged states of the system. We use a spectral diffusion map approach to identify the intrinsic geometry of the data set. In particular, time series data from distributed sensors is used for the construction of diffusion maps. The low dimensional embedding of the data set corresponding to different damage levels is obtained using a singular value decomposition of the diffusion ...


Nondestructive Testing To Identify Delaminations Between Hma Layers Volume 1-Summary, Michael Heitzman, Kenneth Maser, Nam H. Tran, Ray Brown, Haley Bell, Stephen D. Holland, Halil Ceylan, Kimberly Belli, Dennis Hiltunen 2017 National Center for Asphalt Technology at Auburn University

Nondestructive Testing To Identify Delaminations Between Hma Layers Volume 1-Summary, Michael Heitzman, Kenneth Maser, Nam H. Tran, Ray Brown, Haley Bell, Stephen D. Holland, Halil Ceylan, Kimberly Belli, Dennis Hiltunen

Stephen D. Holland

Several types of pavement surface distress can be attributed to delamination between hot-mix asphalt (HMA) layers. Longitudinal cracking in the wheel path and tearing in the surface are two common types of visual distress that are caused by delamination between layers. HMA delamination is primarily due to layer debonding or stripping. Debonding occurs when there is improper tack between paved HMA layers or between an HMA overlay and concrete pavement. Stripping develops when the aggregates and asphalt binder are incompatible, adhesion is lost, and water separates the asphalt binder from the aggregate. These conditions that cause pavement distress cannot be ...


Rfid Tags For Detecting Concrete Degradation In Bridge Decks, Tyler J. Lesthaeghe, Samuel Frishman, Stephen D. Holland, Terry J. Wipf 2017 Iowa State University

Rfid Tags For Detecting Concrete Degradation In Bridge Decks, Tyler J. Lesthaeghe, Samuel Frishman, Stephen D. Holland, Terry J. Wipf

Stephen D. Holland

Steel reinforcing bar (rebar) corrosion due to chlorine ingress is the primary degradation mechanism for bridge decks. In areas where rock salt is used as a de-icing agent, salt water seeps into the concrete through cracks, causing corrosion of the rebar and potentially leading to catastrophic failure if not repaired. This project explores the use of radio frequency identification (RFID) tags as low-cost corrosion sensors. RFID tags, when embedded in concrete, will fail due to corrosion in the same manner as rebar after prolonged exposure to salt water. In addition, the presence of salt water interferes with the ability to ...


Nondestructive Testing To Identify Delaminations Between Hma Layers, Volume 3 - Controlled Evaluation Reports, Michael Heitzman, Kenneth Maser, Nam H. Tran, Ray Brown, Haley Bell, Stephen D. Holland, Halil Ceylan, Kimberly Belli, Dennis Hiltunen 2017 National Center for Asphalt Technology at Auburn University

Nondestructive Testing To Identify Delaminations Between Hma Layers, Volume 3 - Controlled Evaluation Reports, Michael Heitzman, Kenneth Maser, Nam H. Tran, Ray Brown, Haley Bell, Stephen D. Holland, Halil Ceylan, Kimberly Belli, Dennis Hiltunen

Stephen D. Holland

Asphalt pavements with delamination problems experience considerable early damage because delaminations provide paths for moisture damage and the development of damage such as stripping, slippage cracks, and pavement deformation. Early detection of the existence, extent, and depth of delaminations in asphalt pavements is key for determining the appropriate rehabilitation strategy and thus extending the life of the given pavement.


Nondestructive Testing To Identify Delaminations Between Hma Layers, Volume 5 - Field Core Verification, Michael Heitzman, Kenneth Maser, Nam H. Tran, Ray Brown, Haley Bell, Steve Holland, Halil Ceylan, Kimberly Belli, Dennis Hiltunen 2017 National Center for Asphalt Technology at Auburn University

Nondestructive Testing To Identify Delaminations Between Hma Layers, Volume 5 - Field Core Verification, Michael Heitzman, Kenneth Maser, Nam H. Tran, Ray Brown, Haley Bell, Steve Holland, Halil Ceylan, Kimberly Belli, Dennis Hiltunen

Stephen D. Holland

Asphalt pavements with delamination problems experience considerable early damage because delaminations provide paths for moisture damage and the development of damage such as stripping, slippage cracks, and pavement deformation. Early detection of the existence, extent, and depth of delaminations in asphalt pavements is key for determining the appropriate rehabilitation strategy and thus extending the life of the given pavement.


Nondestructive Testing To Identify Delaminations Between Hma Layers Volume 2-Theoretical Models, Michael Heitzman, Kenneth Maser, Nam H. Tran, Ray Brown, Haley Bell, Stephen D. Holland, Halil Ceylan, Kimberly Belli, Dennis Hiltunen 2017 National Center for Asphalt Technology at Auburn University

Nondestructive Testing To Identify Delaminations Between Hma Layers Volume 2-Theoretical Models, Michael Heitzman, Kenneth Maser, Nam H. Tran, Ray Brown, Haley Bell, Stephen D. Holland, Halil Ceylan, Kimberly Belli, Dennis Hiltunen

Stephen D. Holland

Asphalt pavements with delamination problems experience considerable early damage because delaminations provide paths for moisture damage and the development of damage such as stripping, slippage cracks, and pavement deformation. Early detection of the existence, extent, and depth of delaminations in asphalt pavements is key for determining the appropriate rehabilitation strategy and thus extending the life of the given pavement.


Rfid Tags For Detecting Concrete Degradation In Bridge Decks, Tyler J. Lesthaeghe, Samuel Frishman, Stephen D. Holland, Terry J. Wipf 2017 Iowa State University

Rfid Tags For Detecting Concrete Degradation In Bridge Decks, Tyler J. Lesthaeghe, Samuel Frishman, Stephen D. Holland, Terry J. Wipf

Stephen D. Holland

Steel reinforcing bar (rebar) corrosion due to chlorine ingress is the primary degradation mechanism for bridge decks. In areas where rock salt is used as a de-icing agent, salt water seeps into the concrete through cracks, causing corrosion of the rebar and potentially leading to catastrophic failure if not repaired. This project explores the use of radio frequency identification (RFID) tags as low-cost corrosion sensors. RFID tags, when embedded in concrete, will fail due to corrosion in the same manner as rebar after prolonged exposure to salt water. In addition, the presence of salt water interferes with the ability to ...


Nondestructive Testing To Identify Delaminations Between Hma Layers, Volume 4 - Uncontrolled Evaluation Reports, Michael Heitzman, Kenneth Maser, Nam H. Tran, Ray Brown, Haley Bell, Steve Holland, Halil Ceylan, Kimberly Belli, Dennis Hiltunen 2017 National Center for Asphalt Technology at Auburn University

Nondestructive Testing To Identify Delaminations Between Hma Layers, Volume 4 - Uncontrolled Evaluation Reports, Michael Heitzman, Kenneth Maser, Nam H. Tran, Ray Brown, Haley Bell, Steve Holland, Halil Ceylan, Kimberly Belli, Dennis Hiltunen

Stephen D. Holland

Asphalt pavements with delamination problems experience considerable early damage because delaminations provide paths for moisture damage and the development of damage such as stripping, slippage cracks, and pavement deformation. Early detection of the existence, extent, and depth of delaminations in asphalt pavements is key for determining the appropriate rehabilitation strategy and thus extending the life of the given pavement.


Everglades Drainage District: Biennial Report 1927-1928 To The Board Of Commissioners Of Everglades Drainage District, F C. Elliot 2017 University of North Florida

Everglades Drainage District: Biennial Report 1927-1928 To The Board Of Commissioners Of Everglades Drainage District, F C. Elliot

City and Regional Planning—Florida

Everglades Drainage District report 1927-1928


Bridge Structural Condition Assessment Using 3d Imaging, Simon Laflamme, Yelda Turkan, Liangyu Tan 2017 Iowa State University

Bridge Structural Condition Assessment Using 3d Imaging, Simon Laflamme, Yelda Turkan, Liangyu Tan

Simon Laflamme

Objective, accurate, and fast assessment of bridge structural condition is critical to timely assess safety risks. Current practices for bridge condition assessment rely on visual observations and manual interpretation of reports and sketches prepared by inspectors in the field. Visual observation, manual reporting and interpretation has several drawbacks such as being labor intensive, subject to personal judgment and experience, and prone to error. Terrestrial laser scanners (TLS) are promising sensors to automatically identify structural condition indicators, such as cracks, displacements and deflected shapes, as they are able to provide high coverage and accuracy at long ranges. However, there is limited ...


Assessment Of Asphalt Interlayer Designed On Jointed Concrete, R. Christopher Williams, Andrew A. Cascione 2017 Iowa State University

Assessment Of Asphalt Interlayer Designed On Jointed Concrete, R. Christopher Williams, Andrew A. Cascione

R. Christopher Williams

Reflective cracking in hot mix asphalt (HMA) overlays has been a common cause of poor pavement performance in Iowa for many years. Reflective cracks commonly occur in HMA overlays when deteriorated portland cement concrete is paved over with HMA. This results in HMA pavement surfaces with poor ride quality and increased transportation maintenance costs. To delay the formation of cracks in HMA overlays, the Iowa Department of Transportation (Iowa DOT) has begun to implement a crack-relief interlayer mix design specification. The crack-relief interlayer is an asphalt-rich, highly flexible HMA that can resist cracking in high strain loading conditions. In this ...


Assessment Of Nondestructive Testing Technologies For Quality Control/Quality Assurance Of Asphalt Mixtures, Jeramy C. Ashlock, R. Christopher Williams, Hosin David Lee, Shibin Lin, Hanjun Kim, Jeremy Nash 2017 Iowa State University

Assessment Of Nondestructive Testing Technologies For Quality Control/Quality Assurance Of Asphalt Mixtures, Jeramy C. Ashlock, R. Christopher Williams, Hosin David Lee, Shibin Lin, Hanjun Kim, Jeremy Nash

R. Christopher Williams

Asphalt pavements suffer various failures due to insufficient quality within their design lives. The American Association of State Highway and Transportation Officials (AASHTO) Mechanistic-Empirical Pavement Design Guide (MEPDG) has been proposed to improve pavement quality through quantitative performance prediction. Evaluation of the actual performance (quality) of pavements requires in situ nondestructive testing (NDT) techniques that can accurately measure the most critical, objective, and sensitive properties of pavement systems. The purpose of this study is to assess existing as well as promising new NDT technologies for quality control/quality assurance (QC/QA) of asphalt mixtures. Specifically, this study examined field measurements ...


Investigation Of Electromagnetic Gauges For Determining In-Place Hma Density, Andrea N. Kvasnak, R. Christopher Williams, Halil Ceylan, Kasthurirangan Gopalakrishnan 2017 Iowa State University

Investigation Of Electromagnetic Gauges For Determining In-Place Hma Density, Andrea N. Kvasnak, R. Christopher Williams, Halil Ceylan, Kasthurirangan Gopalakrishnan

R. Christopher Williams

Density is an important component of hot-mix asphalt (HMA) pavement quality and long-term performance. Insufficient density of an in-place HMA pavement is the most frequently cited construction-related performance problem. This study evaluated the use of electromagnetic gauges to nondestructively determine densities. Field and laboratory measurements were taken with two electromagnetic gauges—a PaveTracker and a Pavement Quality Indicator (PQI). Test data were collected in the field during and after paving operations and also in a laboratory on field mixes compacted in the lab. This study revealed that several mix- and project-specific factors affect electromagnetic gauge readings. Consequently, the implementation of ...


Reflective Crack Mitigation Guide For Flexible Pavements Final Report, R. Christopher Williams, Ashley F. Buss, Can Chen 2017 Iowa State University

Reflective Crack Mitigation Guide For Flexible Pavements Final Report, R. Christopher Williams, Ashley F. Buss, Can Chen

R. Christopher Williams

Reflective cracks form in pavements when hot-mix asphalt (HMA) overlays are placed over jointed and/or severely cracked rigid and flexible pavements. In the first part of the research, survival analysis was conducted to identify the most appropriate rehabilitation method for composite pavements and to evaluate the influence of different factors on reflective crack development. Four rehabilitation methods, including mill and fill, overlay, heater scarification (SCR), and rubblization, were analyzed using three performance indicators: reflective cracking, international roughness index (IRI), and pavement condition index (PCI). It was found that rubblization can significantly retard reflective cracking development compared to the other ...


Reflective Crack Mitigation Guide For Flexible Pavements, R. Christopher Williams, Ashley Buss, Can Chen 2017 Iowa State University

Reflective Crack Mitigation Guide For Flexible Pavements, R. Christopher Williams, Ashley Buss, Can Chen

R. Christopher Williams

Reflective cracks form in pavements when hot-mix asphalt (HMA) overlays are placed over jointed and/or severely cracked rigid and flexible pavements. In the first part of the research, survival analysis was conducted to identify the most appropriate rehabilitation method for composite pavements and to evaluate the influence of different factors on reflective crack development. Four rehabilitation methods, including mill and fill, overlay, heater scarification (SCR), and rubblization, were analyzed using three performance indicators: reflective cracking, international roughness index (IRI), and pavement condition index (PCI). It was found that rubblization can significantly retard reflective cracking development compared to the other ...


Development Of Non-Petroleum-Based Binders For Use In Flexible Pavements – Phase Ii, R. Christopher Williams, Elvira Joana Ferreira Peralta, Ka-Lai Nieve Ng Puga 2017 Iowa State University

Development Of Non-Petroleum-Based Binders For Use In Flexible Pavements – Phase Ii, R. Christopher Williams, Elvira Joana Ferreira Peralta, Ka-Lai Nieve Ng Puga

R. Christopher Williams

Bio-binders can be utilized as asphalt modifiers, extenders, and replacements for conventional asphalt in bituminous binders. From the rheology results of Phase I of this project, it was found that the bio-binders tested had good performance, similar to conventional asphalt, except at low temperatures. Phase II of this project addresses this shortcoming and evaluates the Superpave performance of laboratory mixes produced with the enhanced bio-binders. The main objective of this research was to develop a bio-binder capable of replacing conventional asphalt in flexible pavements by incorporating ground tire rubber (GTR) into bio-oil derived from fast pyrolysis of agriculture and forestry ...


Validation Of Gyratory Mix Design In Iowa, R. Christopher Williams, Ashley Buss, Marie Grace Joson Mercado, Hosin David Lee, Ashkan Bozorgzad 2017 Iowa State University

Validation Of Gyratory Mix Design In Iowa, R. Christopher Williams, Ashley Buss, Marie Grace Joson Mercado, Hosin David Lee, Ashkan Bozorgzad

R. Christopher Williams

The design number of gyrations (Ndesign) introduced by the Strategic Highway Research Program (SHRP) and used in the Superior Performing Asphalt Pavement (Superpave) mix design method has been commonly used in flexible pavement design throughout the US since 1996. Ndesign, also known as the compaction effort, is used to simulate field compaction during construction and has been reported to produce air voids that are unable to reach ultimate pavement density within the initial 2 to 3 years post-construction, potentially having an adverse impact on long-term performance. Other state transportation agencies have conducted studies validating the Ndesign for their specific regions ...


Digital Commons powered by bepress