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Articles 661 - 690 of 1879
Full-Text Articles in Civil Engineering
Automating Material Delivery Records, Joo Hyoung (Jay) Lee, Bob Mccullouch
Automating Material Delivery Records, Joo Hyoung (Jay) Lee, Bob Mccullouch
JTRP Technical Reports
This project investigated methods on automating field data collection of materials. The method chosen and investigated was bar codes. The automated process requires material suppliers to produce delivery forms that can be recorded and tracked using bar codes. The report describes a system configuration that shows a conceptual process to electronically transfer materials information between the material supplier, trucking company, INDOT personnel and contractor. Other activities reported include survey results from other state transportation agencies, material suppliers, and concrete paving companies. Also, investigated was how to interface with SiteManager software. Recommendations described hardware options for using bar codes and industry …
Durability And Retro-Reflectivity Of Pavement Markings (Synthesis Study), Yi Jiang
Durability And Retro-Reflectivity Of Pavement Markings (Synthesis Study), Yi Jiang
JTRP Technical Reports
Waterborne paints are used to paint pavement markings (edgelines and centerlines) to provide guidance for motorists. The painted markings need to be repainted periodically as their retro-reflectivity deteriorates. The Indiana Department of Transportation (INDOT) repaints pavement markings at least annually. INDOT engineers would like to determine the feasibility of extending the time intervals of repainting pavement markings on at least some types of roadways. The purpose of this synthesis study is to accomplish the following: (1) to locate and assemble documented information on pavement marking durability; (2) to learn what criteria have been used in other states in measuring retro-reflectivity …
Deck Replacement - Use Of Extra Coating Thickness Epoxy-Coated Bars, J. A. Ramirez, Rachel Elizabeth Henkhaus
Deck Replacement - Use Of Extra Coating Thickness Epoxy-Coated Bars, J. A. Ramirez, Rachel Elizabeth Henkhaus
JTRP Technical Reports
The results of this study were implemented in the form of design recommendations for bond of epoxy-coated bars with thicker coatings up to 18 mils. The scope of the work included evaluation of AASHTO LRFD (2004) and ACI 318 design recommendedations for the development and splice length of extra epoxy-coating thinkness reinforcing bars in normal-weight concrete bridge decks and a proposed monitoring plan for a generic concrete bridge deck in Indiana where epoxy-coated bars with thicker coatings might be emeployed. The use of the current provisions for development and splice length of epoxy-coated bars in tension in both the AASHTO …
Post-Construction Evaluation Of Lime-Treated Soils, Chulmin Jung, Antonio Bobet
Post-Construction Evaluation Of Lime-Treated Soils, Chulmin Jung, Antonio Bobet
JTRP Technical Reports
Lime is used to treat weak subgrade soils during construction of highways. A small amount of lime (4 to 7%) is used to rapidly dehydrate and modify fine grained soils. The modification process improves workability and compactability of the soils. Although the lime modification process is primarily aimed at construction expediency, additional effects such as long-term improvement of stiffness and/or strength by pozzolanic and carbonation cementation reactions are expected. Lime treatment has been employed in Indiana over several decades, but the long-term performance of lime-treated soils has not been well quantified and no field tests have been done on roads …
Alternatives To Fuel Tax: A State Level Perspective, Jungeun (Jen) Oh, Kumares C. Sinha
Alternatives To Fuel Tax: A State Level Perspective, Jungeun (Jen) Oh, Kumares C. Sinha
JTRP Technical Reports
Under the current fuel-tax-based highway financing system, the funding gap between highway needs and revenue available is expected to grow as vehicle fuel economy improves and use of alternative fuels increases. Consequently, the highway financing mechanism needs to be restructured or a different financing strategy undertaken. Previous research provided examples of successful implementation of pricing schemes in terms of design of pricing scheme, technology issues, legal and institutional issues, and public acceptability. Synthesizing this information, a methodological framework was established for evaluation of alternative user charging schemes. Based on the assessment of the current and projected highway revenue and the …
Implementation Of Station Health Monitoring Procedures For Its Sensors, Volume 2: Implementation Report, Joseph M. Ernst, Darcy M. Bullock
Implementation Of Station Health Monitoring Procedures For Its Sensors, Volume 2: Implementation Report, Joseph M. Ernst, Darcy M. Bullock
JTRP Technical Reports
No abstract provided.
Risk Assessment Of Various Median Treatments Of Rural Interstates, Natalie M. Villwock, Nicolas Paul Blond, Andrzej P. Tarko
Risk Assessment Of Various Median Treatments Of Rural Interstates, Natalie M. Villwock, Nicolas Paul Blond, Andrzej P. Tarko
JTRP Technical Reports
This report presents results of a comprehensive study that evaluates the safety impacts of alternative median treatments on rural freeways. Extensive data were obtained from Indiana, Colorado, Illinois, Iowa, Missouri, New York, Ohio, Oregon, Washington, and Wisconsin. The studied median treatments include AASHTO-recommended treatments: depressed medians, depressed medians with high and lowtensioned cable barriers, and flush medians with concrete barriers. Other treatments used in the freeway design were also studied: medians with berms, sloped medians, and depressed medians with berms. Negative binomial models were developed to predict the frequency of crashes in three categories: single vehicle (SV), multiple vehicles same …
Development Of A Decision Support System For Selection Of Trenchless Technologies To Minimize Impact Of Utility Construction On Roadways, Dulcy M. Abraham, Hyeon-Shik Baik, Sanjiv B. Gokhale
Development Of A Decision Support System For Selection Of Trenchless Technologies To Minimize Impact Of Utility Construction On Roadways, Dulcy M. Abraham, Hyeon-Shik Baik, Sanjiv B. Gokhale
JTRP Technical Reports
The need to replace deteriorating underground utility infrastructure and to expand utility services, increases the need for utility conduits to intersect roadways. Open-trench method is currently the most widely used method for installation of underground pipelines and conduits of all sizes. However, open-cut construction has several shortcomings, chief amongst which are: health and safety concerns of workers, surface disturbance, disruption to vehicular/pedestrian traffic and reduction of pavement life. Today, other cost-effective alternatives exist to traditional open-trench construction. These methods are categorized as "Trenchless Technologies" as they require minimum trenching (excavation). While the benefits of trenchless technology are quite apparent when …
Automated Composite Column Wrapping, Purdue Ect Team
Automated Composite Column Wrapping, Purdue Ect Team
ECT Fact Sheets Archive
The Automated Composite Column Wrapping is performed by a patented machine known as Robo-Wrapper. Currently there are three versions of the machine available for bridge retrofit work depending on the size of the columns being wrapped. Composite column retrofit jacket systems can be structurally just as effective as conventional steel jacketing in improving the seismic response characteristics of substandard reinforced concrete columns.
New Structural Material - Fiber Reinforced Plastics, Purdue Ect Team
New Structural Material - Fiber Reinforced Plastics, Purdue Ect Team
ECT Fact Sheets Archive
Traditional structural materials are heavy and require a great deal of maintenance. If a new breed of structural material could be produced that was lighter, stronger and more resistant to corrosion, impacts, parasites and chemicals, it could be a good substitute for steel, concrete, masonry and wood. One new material that has the potential to meet these demands is starting to show up on the construction industry market, it is Fiber Reinforced Plastics (FRP). Some technologies that have been developed using FRP materials within the last few years are: structural shapes, concrete reinforcing, prestressing and post-tensioning tendons and pre-engineered structural …
Post-Tensioned Steel Structure, Purdue Ect Team
Post-Tensioned Steel Structure, Purdue Ect Team
ECT Fact Sheets Archive
Welded steel Moment-Resisting Frames (MRFs) were long considered as one the most earthquake-resistant types of structures. Recently, the idea of applying the post-tensioning technology to achieve moment resistant structural systems has been investigated at the University of California, San Diego. Since 1996, moment-resisting connections using post-tensioning concepts have been developed and tested for precast concrete beam-to-column connections, and concrete shear walls.
Precast Hybrid Moment Resistant Frames, Purdue Ect Team
Precast Hybrid Moment Resistant Frames, Purdue Ect Team
ECT Fact Sheets Archive
The recent disasters from earthquakes in Northridge, California and Kobe, Japan, demands a structural design that will provide integrity of the structure and protection of the investment against seismic activity. Charles Pankow builders developed a new frame that absorbs seismic energy independent of the integrity of the structural members and that delivers superior post elastic response. The Precast Hybrid Moment Resisting Frame (PHMRF) involves a column/beam connection utilizing both elastic and inelastic action at the joint for Precast Moment Resistant Frames.
Spraywall, Cured-In-Placed Method For Manhole Rehabilitation, Purdue Ect Team
Spraywall, Cured-In-Placed Method For Manhole Rehabilitation, Purdue Ect Team
ECT Fact Sheets Archive
Manholes and other underground structures commonly account for 25-30 % of infiltration and up to 70% of inflow in sanitary sewer collection systems. These will cause sewer overflow and endanger the nearby environment. SprayWall is a spray-applied, cured-in-place method of construction and is primarily used in manholes. It uses urethane material that provides excellent corrosion resistance. SprayWall is structural and can withstand ground water loads on a long-term basis.
Welding Clamps, Purdue Ect Team
Welding Clamps, Purdue Ect Team
ECT Fact Sheets Archive
While welding technology has advanced in recent years, methods of fitting pipe remained primitive. Chain Clamps are versatile: each clamp can fit-up elbows, tees, flanges, and other pipe fittings. All carbon steel Chain Clamps are zinc plated to resist spatter and corrosion. On the average, one Chain Clamp costs about 40% less and weighs about 77% less than the required number of cage clamps to cover the same range of pipe diameter.
Decision Aid For Electronic Simulation In Construction, Purdue Ect Team
Decision Aid For Electronic Simulation In Construction, Purdue Ect Team
ECT Fact Sheets Archive
The Decision Aid for Electronic Simulation in Construction is an output of the research “Electronic Simulation in Construction” sponsored by CII (Construction Industry Institute). The Web-based Decision Aid was developed to assist a decision-maker in utilizing the results of this research. This system along with the database allows the user to (i) establish the need for electronic simulation, (ii) ascertain specific needs with respect to application domain, product features, and operating system requirements, and (iii) identify products and suppliers that support the need and requirements established in the previous steps.
T.O.C.S. : Hydrogen Sulfide Remission System, Purdue Ect Team
T.O.C.S. : Hydrogen Sulfide Remission System, Purdue Ect Team
ECT Fact Sheets Archive
BioEnviroTech, Inc., (BET) developed Toxicity Odor Corrosion Sulfides (T.O.C.S.) Remission System for hydrogen sulfide reduction in municipal and industrial wastewater sewer, lift stations and force mains. This safe and cost effective biotreatment technology uses safe and natural bacteria to interrupt sulfide generation.
Mobile Bricklaying Robot, Purdue Ect Team
Mobile Bricklaying Robot, Purdue Ect Team
ECT Fact Sheets Archive
Bricklaying is a highly repetitive and physically exhaustive task. The tasks of the construction site bricklaying robot include removing bricks or blocks from prepared pallets, the application of bonding material and the erection of brickwork at a high level of accuracy and quality. Prototype realization of the bricklaying robot, which is based on a commercial construction machine, has been done by two research institutes in close cooperation with ten industrial partners.
3m Personal Air Monitoring Systems, Purdue Ect Team
3m Personal Air Monitoring Systems, Purdue Ect Team
ECT Fact Sheets Archive
3M monitors are made to allow sample desorption directly in the monitor itself. The monitor comes with a snap-on elution cap that permits the desorbing solvent to be injected into the monitor. The solution is then poured into sample vials for analysis. 3M monitors use standard analytical methods: gas chromatography for the organic vapor monitor and ethylene oxide monitor, and colorimetry for the formaldehyde monitor.
Ehydraulic Pneumatic Fracturing, Purdue Ect Team
Ehydraulic Pneumatic Fracturing, Purdue Ect Team
ECT Fact Sheets Archive
The technology is an enhancement process designed for integration with primary in-situ treatment technologies such as vapor extraction, bioremediation, thermal treatment, and 'pump and treat'. Fractures in dense soils are created, using hydraulic or pneumatic methods, making existing fractures larger to get at contaminants and allowing a more effective distribution of the extractive air throughout the soil. Pneumatic Fracturing was jointly developed by Accutech Remedial Systems Inc. and the New Jersey Institute of Technology. It involves the injection of air (or another gas) into a contaminated geologic formation at sufficient pressure and flow rate to create artificial fractures or to …
Electro Osmotic Pulse Technology For Prevention Of Water Intrusion In Concrete Structure, Purdue Ect Team
Electro Osmotic Pulse Technology For Prevention Of Water Intrusion In Concrete Structure, Purdue Ect Team
ECT Fact Sheets Archive
Groundwater intrusion into a building can cause serious structural degradation, corrosion of expensive mechanical equipment. ElectroOsmotic Pulse (EOP) technology is based on the concept of electroosmosis; the movement of an electrically charged ion in a liquid under the influence of an external electric field. EOP not only eliminates water-seepage problems from the interior of the structure without excavation, but it further mitigates corrosion damage to mechanical equipment and reduces the interior relative humidity of the basements.
Soundprint: Continuous Acoustic Monitoring For Structure, Purdue Ect Team
Soundprint: Continuous Acoustic Monitoring For Structure, Purdue Ect Team
ECT Fact Sheets Archive
The effective evaluation and management of corrosion in unbonded post-tensioned tendons requires an understanding of the causes of corrosion as well as an appreciation of the measures required to mitigate future corrosion. Present evaluation methods have been unsuccessful in accurately assessing the existing condition of post-tensioned structures. Continuous monitoring technology allows engineers to locate future failures so that property owners can implement cost-effective management strategies. An acoustic monitoring system, SoundPrint® has been developed which allows continuous monitoring of entire structures.
Arcagent – Weld Process Quality Monitoring System, Purdue Ect Team
Arcagent – Weld Process Quality Monitoring System, Purdue Ect Team
ECT Fact Sheets Archive
The ARCAgent 2000 is a real-time monitoring and alarming unit for automated and semi-automated arc welding (GMAW, GTAW, FCAW, SAW, SMAW) applications. The ruggedized ARCAgent 2000 uses an embedded microprocessor for high speed analysis of arc current, supply voltage, gas flow, wire feed speed, and an additional 4-20 mA sensor to verify the weld process parameters. When process problems are detected, context specific diagnostics information is displayed directly to the operator for corrective action.
Alternative Material Dowel Bars For Rigid Pavement Joints, Purdue Ect Team
Alternative Material Dowel Bars For Rigid Pavement Joints, Purdue Ect Team
ECT Fact Sheets Archive
Over the last thirty to forty years, dowel support of the joint in Rigid Joint Pavement (RJP) has been widely used. The problem of deterioration of concrete pavement joints has resulted in the search for alternate solutions. Fiber-reinforced polymer (FRP) and stainless steel represent corrosion resistant alternatives to conventional galvanized steel in this application. The recently study by the FHWA of Alternative Materials for Highway Construction demonstrated that even with extended wet-dry cycles of exposure to fluids of high chloride content, at various temperatures and PH levels, stainless steel had corrosion resistance hundreds and in many cases thousands of times …
Procurezone.Com, Purdue Ect Team
Procurezone.Com, Purdue Ect Team
ECT Fact Sheets Archive
TProcureZone.com is a comprehensive procurement system. On-line functions include: estimating the cost of a purchase; preparing and issuing detailed specifications and complete requests for proposals; requesting bids from selected suppliers; communicating with bidders; receiving, comparing, and evaluating bids; negotiating offers and conducting auctions; issuing purchase orders with all required attachments; making payment; and monitoring schedules and deliveries.
Armstrong I-Ceilings - Wireless Systems, Purdue Ect Team
Armstrong I-Ceilings - Wireless Systems, Purdue Ect Team
ECT Fact Sheets Archive
It is sometimes inconvenient to use cell phones with laptop computers in many buildings, especially in a room with no windows or on the basement floors. Cell phone or wireless equipment coverage is limited in many buildings due to the lack of technical support to the wireless service. It has required installing many small antennas in a building. Armstrong's new i-ceilings Wireless Systems Antenna Panel is a standard Armstrong ceiling panel with the antenna already imbedded inside.
Self-Placing Concrete, Purdue Ect Team
Self-Placing Concrete, Purdue Ect Team
ECT Fact Sheets Archive
Certain concrete pours have areas where the congestion of reinforcing bars make placement of concrete almost impossible. Using conventional placing and vibration techniques, the resulting concrete can have considerable honeycombing due to the development of voids. Self-placing concrete is a possible solution to the problem. Also known as self-compactable concrete, self-consolidating concrete, flowable concrete, and non-vibration concrete. These concretes eliminate the need for vibration in a placement process where the reinforcement makes proper vibration difficult or impossible.
Rapid-1 Hardening Accelerator Concrete Admixture, Purdue Ect Team
Rapid-1 Hardening Accelerator Concrete Admixture, Purdue Ect Team
ECT Fact Sheets Archive
SIKA Rapid-1 is a concrete admixture that allows the development of very early high strengths in concrete consisting of commonly used mix components. Unlike concrete set accelerators, it does not reduce set time or long-term strength, and it does not corrode steel reinforcing. This hardening accelerator allows placement of fresh concrete without early stiffening, followed by a period of very rapid strength gain after initial set.
Corrosion Inhibitors For Reinforced Concrete, Purdue Ect Team
Corrosion Inhibitors For Reinforced Concrete, Purdue Ect Team
ECT Fact Sheets Archive
Steel corrosion in reinforced concrete structures has been a major problem across the U.S. Steel-reinforced concrete structures are continually subject to attack by corrosion brought on by naturally occurring environmental conditions. FerroGard, a corrosion inhibitor, developed by Sika Corporation, penetrates hardened concrete to dramatically reduce corrosion by 65% and extend the structure's service life.
Automated Spray Pothole Patching Truck, Purdue Ect Team
Automated Spray Pothole Patching Truck, Purdue Ect Team
ECT Fact Sheets Archive
The RA-300 patcher, manufactured by Rosco Manufacturing, Madison, S.D., is a fully automated spray patching road maintenance vehicle, which fills potholes and cracks on the road. A operator can control all patching functions with the control panel and joystick from the safety and comfort of the truck cab.
Lateral Statnamic Testing, Purdue Ect Team
Lateral Statnamic Testing, Purdue Ect Team
ECT Fact Sheets Archive
STATNAMIC system was developed by adapting an axial test device. The device consists of three main parts: piston, cylinder/silencer, and reaction masses. STATNAMIC testing overcomes the practical difficulties of both static and dynamic load tests.