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Articles 8941 - 8970 of 11808
Full-Text Articles in Civil and Environmental Engineering
Recycled Plastic Composite Railroad Crossties, Purdue Ect Team
Recycled Plastic Composite Railroad Crossties, Purdue Ect Team
ECT Fact Sheets Archive
The U.S. Army Engineer Research and Development Center, Construction Engineering Research Laboratory (CERL) led a team that developed, demonstrated, and patented innovative recycled plastic composite material for use as railroad crossties to replace chemically-treated wood ties. Replacement of turnout ties is a major cost item because of the size and complexity of these components. Since the mid-1990s CERL has conducted research on composite RR ties made of recycled post-consumer waste plastics. Because these plastic composite ties are inherently resistant to moisture damage, rot, and insect attack, they require no chemical treatments as do wood ties.
Smart Concrete, Purdue Ect Team
Smart Concrete, Purdue Ect Team
ECT Fact Sheets Archive
Concrete has been widely used for many years as a composite material for various types of structures. One of the weakness of concrete is that it cannot withstand tension which can cause cracks easily. There has been a huge demand to monitor concrete structures cracking and preventing them from propagating further. Smart concrete was developed Dr. Deborah D.L. Chung from State University of New York at Buffalo. Smart concrete is reinforced by carbon fiber as much as 0.2% to 0.5% of volume to increase its sense ability to strain or stress while still has good mechanical properties.
Digital Hardhat System, Purdue Ect Team
Digital Hardhat System, Purdue Ect Team
ECT Fact Sheets Archive
The Digital Hardhat (DHH) is a pen-based personal computer (PC) running a Windows operating system, which is used to collect multimedia information such as text, sound, video, and images. This pen-based computer can also be used to communicate between the construction site and other locations using various connection methods including a wireless network connection, which enables a personnel to roam around the site and video teleconference live with others to solve problems collaboratively.
Bridge Lock-Up Device System, Purdue Ect Team
Bridge Lock-Up Device System, Purdue Ect Team
ECT Fact Sheets Archive
The Colebrand Lock-up Device (LUD) provides additional substructure strength to resist seismic forces as a structural shock transmission unit for highway bridges. This system can provide a temporary rigid link between bridge structural members under seismic, braking, or other fast-acting type loads, while permitting slow thermal movements.
Primecontract.Com, Purdue Ect Team
Primecontract.Com, Purdue Ect Team
ECT Fact Sheets Archive
The PrimeContract.com network is based on a three-tier software architecture using JAVA in a UNIX environment. The network is designed to effortlessly accommodate large numbers of users in an extremely secure environment.
Prosidyc: Simulation Program For Construction Operations, Purdue Ect Team
Prosidyc: Simulation Program For Construction Operations, Purdue Ect Team
ECT Fact Sheets Archive
PROSIDYC is a system for simulating construction operations jointly developed by the Planning and Methods Unit of Dragados y Construcciones, Madrid, Spain and the Division of Construction Engineering & Management at Purdue University. PROject SImulation Dragados Y Construcciones (PROSIDYC) is a computer based system for analyzing construction job site production processes. It is used to improve productivity in the field by studying resource utilization and cycle times and identifying opportunities for production improvement. PROSIDYC uses the CYCLic Operations NEtwork (CYCLONE) modeling format originally developed by Daniel W. Halpin
An Industrial Gas Turbine/Compressor Package Designed For Rapid Installation And Commissioning, Purdue Ect Team
An Industrial Gas Turbine/Compressor Package Designed For Rapid Installation And Commissioning, Purdue Ect Team
ECT Fact Sheets Archive
A reduction in both the time and the cost of installation of medium-to-large industrial gas turbine mechanical drive packages can be achieved. Integration of the gas turbine driver, driven equipment, and ancillaries on two easily-assembled skids is made possible by the application of several technological developments, including aeroderivative gas turbine engines, dry gas compressor seals, compact plate-type heat exchangers, variable-speed AC motor drives, and microprocessor-based control systems which are certified for hazardous environments. By minimizing the need for interconnection of piping and wiring between multiple equipment and controls locations, site installation and commissioning time is drastically reduced. This can result …
Stroboscope, Purdue Ect Team
Stroboscope, Purdue Ect Team
ECT Fact Sheets Archive
STROBOSCOPE is an acronym for STate and Resource Based Simulation of COnstructionProcEsses. It is a general-purpose simulation programming language that has been designed for the simulation of very complex construction processes that involve many different types of resources. STROBOSCOPE models are based on a network of interconnected modeling elements and on a series of programming statements that give the elements unique behavior and control the simulation.
Site Characterization And Analysis Penetrometer System (Scaps) : Assessing Site Cotamination, Purdue Ect Team
Site Characterization And Analysis Penetrometer System (Scaps) : Assessing Site Cotamination, Purdue Ect Team
ECT Fact Sheets Archive
While a number of techniques exist for the remediation of contaminated soils, one of the largest problems is often the initial site assessment. It can be a difficult, expensive and time-consuming process to determine the exact extent of site contamination. The U.S. Army Engineer Waterways Experiment Station (WES) under the sponsorship of the U.S. Army Environmental Center (AEC) initiated the development of the Site Characterization and Analysis Penetrometer System (SCAPS) Research, Development, and Technology Demonstration Program to provide the Department of Defense (DoD) with a rapid and cost-effective means to characterize soil conditions at DoD sites undergoing installation restoration (cleanup).
3d Laser Scanning & Modeling System, Purdue Ect Team
3d Laser Scanning & Modeling System, Purdue Ect Team
ECT Fact Sheets Archive
Traditional methods of measuring and modeling the surface geometry of large, complex structures or sites that require engineering or survey-grade accuracy are often inaccurate, incomplete or expensive. Inaccurate or incomplete drawings and models often lead to costly construction errors or delays. A portable, auto-scanning laser and PC system that lets users economically obtain accurate, complete, and timely as-built geometry information for large structures and sites. The system can remotely measure natural surfaces up to 100m away at the speed of 800 points per second. With spacing between adjacent points as fine as 1mm, users can capture an extremely high level …
Real Time Positioning, Purdue Ect Team
Real Time Positioning, Purdue Ect Team
ECT Fact Sheets Archive
Construction operations involve location and positioning elements in the field. There are two primary components to the system; transmitters and receivers. The system allows multiple users to work at the same time once the system is set up. These users can include surveyors, craft people, and equipment operators each of whom is working concurrently and using the positioning system to capture accurate real-time position information about the work environment.
Extraction Of Contaminated Soil Using High Pressure Jet Grouting, Purdue Ect Team
Extraction Of Contaminated Soil Using High Pressure Jet Grouting, Purdue Ect Team
ECT Fact Sheets Archive
Removal of contaminated soil underneath existing structures causes settlement. There is a need for a remediation technology that eliminates this problem. The jet grouting by the triple rod system can be combined with an on site remediation technology (e.g., soil washing). Jet grouting was developed primarily for underpinning and/or excavation support. The benefits of this technology lie in the future reduction of structural settlement, and site access flexibility.
Mechanically Stabilized Earth Wall Abutments For Bridge Support, Ioannis Zevgolis, Philippe L. Bourdeau
Mechanically Stabilized Earth Wall Abutments For Bridge Support, Ioannis Zevgolis, Philippe L. Bourdeau
JTRP Technical Reports
The research is an investigation on the possible use of MSE bridge abutments as direct support of bridges on Indiana highways. First, analysis was performed following conventional design methods, in order to assess the performance of MSE bridge abutments with respect to ultimate limit states, i.e. external and internal stability. In the second part of the study, finite element analysis was performed, in order to assess the performance of the structures with respect to serviceability limit states, i.e. immediate and consolidation settlements. In both parts, analysis was performed on case examples that reflect relatively typical situations. The main findings confirm …
Effective And Robust Coordination Of Traffic Signals On Arterial Streets, Volume 1, Research Report, Wei Li, Andrew P. Tarko
Effective And Robust Coordination Of Traffic Signals On Arterial Streets, Volume 1, Research Report, Wei Li, Andrew P. Tarko
JTRP Technical Reports
Many transportation agencies use Synchro and SimTraffic software package to optimize signal coordination. In general, this software package effectively reduces the efforts of traffic systems engineers and improves the quality of the designed coordination. Nevertheless, the initial solutions given by the software packages usually require adjustment, at both the design and implementation stages. The major objective of this research, therefore, is to reduce the time and effort needed in solution tuning and thus to improve the effectiveness and the efficiency of using Synchro/SimTraffic in arterial signal coordination design. The research outcome is expected to help traffic systems engineers reach reasonable …
A Prescriptive Analysis Of The Indiana Coal Transportation Infrastructure, Thomas F. Brady, Chad M. Pfitzer
A Prescriptive Analysis Of The Indiana Coal Transportation Infrastructure, Thomas F. Brady, Chad M. Pfitzer
JTRP Technical Reports
This report presents the findings of a scoping study of Indiana’s coal transportation infrastructure. Throughout the literature search and investigative phases of this project, it was clear that there exists growing awareness of the importance that transportation plays in the domestic coal industry. There is evidence that suggests transportation costs may be higher than the cost of mining coal. Numerous studies suggest that coal transportation can be developed and utilized for significant competitive economic advantage. The Powder River Basin area in Wyoming is a stellar example of how the combination of a large natural resource and careful transportation planning can …
A Study Of Effective Soil Compaction Control Of Granular Soils, Vincent P. Drnevich, Aaron C. Evans, Adam Buser Prochaska
A Study Of Effective Soil Compaction Control Of Granular Soils, Vincent P. Drnevich, Aaron C. Evans, Adam Buser Prochaska
JTRP Technical Reports
Although it is known that impact compaction tests are not appropriate for granular soils, these tests continue to be widely used. Excessive settlements frequently occur in granular soils where specified field compaction is based on Standard Proctor (ASTM D 698; AASHTO T 99) maximum dry unit weights. A laboratory test program evaluated alternative test methods for granular soil compaction control and showed that a Vibrating Hammer method (similar to British Standard BS 1377:1975, Test 14) has great promise for laboratory compaction of these soils. A One-Point Vibrating Hammer test on an oven-dry soil sample is able to provide the maximum …
Effective And Robust Coordination Of Traffic Signals On Arterial Streets, Volume 2, Guidelines Of Design, Wei Li, Andrew P. Tarko
Effective And Robust Coordination Of Traffic Signals On Arterial Streets, Volume 2, Guidelines Of Design, Wei Li, Andrew P. Tarko
JTRP Technical Reports
Many transportation agencies use Synchro and SimTraffic software package to optimize signal coordination. In general, this software package effectively reduces the efforts of traffic systems engineers and improves the quality of the designed coordination. Nevertheless, the initial solutions given by the software packages usually require adjustment, at both the design and implementation stages. The major objective of this research, therefore, is to reduce the time and effort needed in solution tuning and thus to improve the effectiveness and the efficiency of using Synchro/SimTraffic in arterial signal coordination design. The research outcome is expected to help traffic systems engineers reach reasonable …
Long-Term Effects Of Super Heavy-Weight Vehicles On Bridges, Scott M. Wood, Necip Onder Akinci, Judy Liu, Mark D. Bowman
Long-Term Effects Of Super Heavy-Weight Vehicles On Bridges, Scott M. Wood, Necip Onder Akinci, Judy Liu, Mark D. Bowman
JTRP Technical Reports
A permit truck which exceeds the predefined limit of 108 kips is defined as a superload in Indiana. This study was conducted to examine the long-term effects of superload trucks on the performance of typical slab-on-girder bridges and to assess the likelihood of causing immediate damage. Typical steel and prestressed concrete slab-on-girder type bridges were analyzed using both beam line analysis and detailed finite element models. Furthermore, one prestressed concrete bridge and one steel bridge were instrumented using more than 50 sensors each. Strains and deflections were measured during a live load test, and each bridge was monitored for more …
Synthesis Study: Heat Treatment And Its Effects On Rehabilitating Steel Bridges In Indiana, Matthew Lackowski, Amit Varma
Synthesis Study: Heat Treatment And Its Effects On Rehabilitating Steel Bridges In Indiana, Matthew Lackowski, Amit Varma
JTRP Technical Reports
The literature review of prior heat straightening research indicated that significant research has been conducted on the development of: (i) heat straightening repair techniques and their field implementation, (ii) guidelines and recommendations for heat straightening repair, (iii) empirical procedures for estimating plastic rotations achieved during heat straightening, (iv) empirical procedures for predicting residual stresses caused by heat straightening, and (v) the effects of heat straightening on the structural properties of repaired bridges. Currently, there is a need for additional research on: (a) the fatigue performance of heat straightened beams, (ii) the effects of single and multiple heat straightening on the …
Safety Conscious Planning In Indiana: Predicting Safety Benefits In Corridor Studies, Volume 2: Pass And Inpass User Manual, Andrzej P. Tarko, Michal Adam Inerowicz, Hong Liang, Jorge L. Ramos
Safety Conscious Planning In Indiana: Predicting Safety Benefits In Corridor Studies, Volume 2: Pass And Inpass User Manual, Andrzej P. Tarko, Michal Adam Inerowicz, Hong Liang, Jorge L. Ramos
JTRP Technical Reports
the calculation of development and splice lengths. Forty-six glass FRP, carbon FRP, and steel reinforced concrete beams
Influence Of Speed Limits On Roadway Safety In Indiana, Nataliya V. Malyshkina, Fred L. Mannering, Samuel Labi
Influence Of Speed Limits On Roadway Safety In Indiana, Nataliya V. Malyshkina, Fred L. Mannering, Samuel Labi
JTRP Technical Reports
The influence of speed limits on roadway safety is an extremely important social issue and is subject to an extensive debate in the State of Indiana and nationwide. With roughly 900 fatalities and sixty thousand injuries annually in Indiana, traffic accidents place an incredible social and economic burden on the state. Still, speed limits posted on highways and other roads are routinely exceeded as individual drivers try to balance safety and mobility (speed) as well as risks of penalties from enforcement efforts. This research explores the relationship between speed limits and roadway safety. Specifically, the research focuses on the influence …
Recasting Dilemma Zone Design As A Marginal Cost-Benefit Problem, Anuj Sharma, Darcy M. Bullock, Srinivas Peeta
Recasting Dilemma Zone Design As A Marginal Cost-Benefit Problem, Anuj Sharma, Darcy M. Bullock, Srinivas Peeta
Department of Civil and Environmental Engineering: Faculty Publications
One control objective at high-speed isolated intersections is to provide safe phase transition by minimizing the occurrence of high-speed vehicles in the dilemma zone before the phase is terminated. An upper limit for extending the green (maximum green time) is used to avoid an indefinite extension of the main-street green. Currently, the maximum green times are chosen by using engineering judgment. This approach does not explicitly consider the trade-offs between safety and delay and hence often results in both unsafe and inefficient performance at the intersection under medium to heavy traffic volumes. The dilemma problem is recast as one of …
Limitations Of Simultaneous Gap-Out Logic, Anuj Sharma, Darcy M. Bullock, Srinivas Peeta
Limitations Of Simultaneous Gap-Out Logic, Anuj Sharma, Darcy M. Bullock, Srinivas Peeta
Department of Civil and Environmental Engineering: Faculty Publications
The current practice of specifying simultaneous gap-out logic places constraints on signal controller logic. These constraints cannot be achieved under high traffic flow conditions, and degraded signal efficiency and dilemma zone protection often result. This study documents the phenomenon described above with set-back detectors at an instrumented intersection in Noblesville, Indiana, and characterizes the problem of dilemma zone protection as being traffic-volume dependent, a factor that should be carefully considered before the simultaneous gap-out logic is applied. Implementation of simultaneous gap-out logic led to max out ranging from 3.5% to 40% of cycles per hour during peak traffic flow periods …
Event-Based Data Collection For Generating Actuated Controller Performance Measures, Edward J. Smaglik, Anuj Sharma, Darcy M. Bullock, James R. Sturdevant, Gary Duncan
Event-Based Data Collection For Generating Actuated Controller Performance Measures, Edward J. Smaglik, Anuj Sharma, Darcy M. Bullock, James R. Sturdevant, Gary Duncan
Department of Civil and Environmental Engineering: Faculty Publications
Cycle-by-cycle data have been shown to be effective in the analysis of a signalized intersection with measures of effectiveness such as volume-to-capacity ratios, arrival type, and average vehicular delay. Currently, actuated traffic controllers are unable to store vehicle counts and vehicle occupancy in cycle-by-cycle bins, requiring extra equipment and personnel to collect data in these bins. The objective of this research was to develop an integrated general purpose data collection module that time stamps detector and phase state changes within a National Electrical Manufacturers Association actuated traffic signal controller and uses those data to provide quantitative graphs to assess arterial …
Regulation Issues And Prediction Of Natural Estrogen Loads For Wastewater Treatment Plants, Michelle E. Jarvie
Regulation Issues And Prediction Of Natural Estrogen Loads For Wastewater Treatment Plants, Michelle E. Jarvie
Dissertations, Master's Theses and Master's Reports - Open
No abstract provided.
Analysis Of Ultraviolet Energy Distribution In Uv Disinfection Systems Using Monte Carlo Ray -Trace Method, Khoi Trung Nguyen
Analysis Of Ultraviolet Energy Distribution In Uv Disinfection Systems Using Monte Carlo Ray -Trace Method, Khoi Trung Nguyen
Civil & Environmental Engineering Theses & Dissertations
Determination of fluence rate in ultraviolet (UV) disinfection systems is a crucial part in evaluating disinfection efficiency of the systems. A robust Monte Carlo Ray Trace (MCRT) method has been developed to determine fluence rates in three-dimensional space of the systems. This is a statistical sampling method in which millions of random light energy bundles are simulated from the axis of each UV lamp and traced through the system until their energies reduce to a minimum threshold level. Inherent phenomena including refraction through quartz tubes, specular reflection at quartz tube surfaces, and absorption by quartz and water, along with specific …
Using Principles Of Momentum Conservation To Develop A Coastal Storm Impulse Scale (Cosi), Chris Adam Klentzman
Using Principles Of Momentum Conservation To Develop A Coastal Storm Impulse Scale (Cosi), Chris Adam Klentzman
Civil & Environmental Engineering Theses & Dissertations
Coastal engineers have long recognized the need for a storm classification system that combines wave conditions, storm surge, and the length of time for the storm event. A new classification system has been developed that is based on the conservation of total horizontal momentum. This research concentrated on developing the theory and then applying that theory for a 10-year period of data from the Army Corps of Engineers Field Research Facility (FRF) in Duck, North Carolina. When fully developed, the Coastal Storm Impulse scale (COSI) may be applied to all previous Hurricane and Northeaster storm events along a coast and …
Characterization Of On-Road Petrol Vehicle Emissions Patterns In Dar Es Salaam City (Tanzania), Geoffrey John
Characterization Of On-Road Petrol Vehicle Emissions Patterns In Dar Es Salaam City (Tanzania), Geoffrey John
Tanzania Journal of Engineering and Technology (TJET)
Motor vehicle emissions have been identified to be the major source of air pollution in most urban cities. It has serious impact on urban air quality and public health. The Governments of many countries need to adopt stringent vehicle emissions regulations to protect the air quality, the undertaking of which can only be implemented once the problem at hand is known. In the present study, the characteristics of on road vehicle emissions from the selected local ar~as at the city of Dar es Salaam in a developing country for in-use petrol vehicles for urban driving conditions ranging from idling, lOkm/h …
Investigation On Distribution Of Cast Properties On Aluminum Plates Poured By Side Gating Technique, Joseph Runyoro
Investigation On Distribution Of Cast Properties On Aluminum Plates Poured By Side Gating Technique, Joseph Runyoro
Tanzania Journal of Engineering and Technology (TJET)
Casting technologies wllich improve casting yield and intenzal sOllndness of thin wall cast components are of particular interest to industry especially for critical applications. The main aim of fOll1ldries is to achieve castings free from defects at low cost. It hils been thought that pouring casting by side ingate technique improve directional solidification as the metal stays hot for long time in the feeder cum ingate. Experiments were carried alit IIsing a side gating technique to cast a number of 300 mm x 300 mm LMO and LM 25 plates in furall and pepset sand moulds. The thickness used was …