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Articles 91 - 120 of 495
Full-Text Articles in Civil Engineering
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.
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 …
Encapco Emulsified Treated Base Product, Purdue Ect Team
Encapco Emulsified Treated Base Product, Purdue Ect Team
ECT Fact Sheets Archive
Encapco’s organic-based asphalt emulsion is used to immobilize lead in contaminated soil. Unlike other fixation or stabilization technologies, which physically bind contaminants in the soil matrix, Encapco’s emulsion is capable of chemically fixating lead. The Encapco process employs a chemical binding reaction in addition to encapsulation to meet regulatory leaching tests. The Encapco process has been evaluated on a number of contaminated materials ranging from silty sand from a quarry site, contaminated sand from a steel mill, and a foundry sand.
Acoustic Wave Sensors, Purdue Ect Team
Acoustic Wave Sensors, Purdue Ect Team
ECT Fact Sheets Archive
Modern office buildings are generally considered safe and healthful working environments. However, energy conservation measures have minimized the infiltration of outside air and contributed to the buildup of indoor air contaminants. Three products manufactured by Microsensor Systems Inc. are introduced: HAZMATCAD, CW Sentry Plus, MiniCAD MKII.
Fiber Optic Sensor : Monitoring Precast Beams, Purdue Ect Team
Fiber Optic Sensor : Monitoring Precast Beams, Purdue Ect Team
ECT Fact Sheets Archive
A new bridge over the Rio Puerco river, west of Albuquerque will be the first of its kind in the nation with built-in fiber-optic sensors to monitor stress in the bridge's girders. Known as "smart bridge" technology, the self-monitoring system offers many advantages over methods that rely largely on visual inspections.
Precast Concrete Beam-To-Column Connection System, Purdue Ect Team
Precast Concrete Beam-To-Column Connection System, Purdue Ect Team
ECT Fact Sheets Archive
Compared to conventional concrete constructions, precast concrete is a better option which is more cost-effective for production, transport, and erection when columns and beams can be fabricated independently. The BSF connection is a hidden beam and connection for gravity loads that eliminates the need for projecting column corbels. From a steel box cast into the concrete beam end, a sliding steel “knife” plate with a safety notch is cantilevered into a steel box that has been cast into the concrete column.
Tru-Frame Steel Truss, Purdue Ect Team
Tru-Frame Steel Truss, Purdue Ect Team
ECT Fact Sheets Archive
After earthquakes, repair and replacement of structural elements is time consuming and expensive. This new truss system contains several diagonal elements designed to absorb seismic energy and yield at prescribed levels. Standard moment frame design requires 100% visual inspection and ultrasonic testing which is eliminated when using the Tru-Frame system. Since all Tru-Frame connections are single pass fillet welds and tension control bolts, they can be visually inspected any time after completion without need for additional testing. This allows subsequent trades to start their work sooner.
Attachment Of Steel Decking Using Mechanical Fasteners And Powder Actuated Or Pneumatic Tools, Purdue Ect Team
Attachment Of Steel Decking Using Mechanical Fasteners And Powder Actuated Or Pneumatic Tools, Purdue Ect Team
ECT Fact Sheets Archive
An alternative method of attaching steel metal decks onto open web bar joist or structural steel beams. Erectors require a fast, reliable, efficient fastening method that can be used independent of weather conditions, and is easy, cost effective and verifiable. Attachment of the deck panels has historically been performed using puddle welding, with self-drilling screws used only when necessary. Today, special nails, driven either by powder propellant (powder actuated tools) or by compressed air (pneumatic tools), are experiencing ever-increasing usage due to the speed, versatility and cost-effectiveness benefits derived by the installer and owner.
Pipeman:Safety In Trenches, Purdue Ect Team
Pipeman:Safety In Trenches, Purdue Ect Team
ECT Fact Sheets Archive
Even though heavy construction equipment such as a crane or backhoe excavator, is used to perform the task of pipe laying in the trench, workers are required to be inside the trench to guide the excavation, pipe laying, and final alignment. Work place safety has become a major concern in the construction industry over the past few decades, and trench cave-ins have caused serious and often fatal injuries to workers in the United States. The Construction Automation and Robotics Laboratory(CARL) at North Carolina State University has developed an alternative which involves advanced new technology: the prototype robotic excavation and pipe …
Smart Sewer Assessment Systems, Purdue Ect Team
Smart Sewer Assessment Systems, Purdue Ect Team
ECT Fact Sheets Archive
The need for accurate preventive assessment of sewer conditions is increasing world wide. The new method utilizes qualified inspection systems that are automated and that utilize artificial intelligence to assess whether or not a crack in the surface of the pipe exists. The KARO system is one example. Developed by the German Federal Ministry of Education, Science, Research, and Technology (BMBF) and four partners from both industry and research institutions. This system is composed of a mobile control and surveillance station, and a mobile robot.
Virtualstep: 4d Simulation, Purdue Ect Team
Virtualstep: 4d Simulation, Purdue Ect Team
ECT Fact Sheets Archive
The main value from 4D is derived from using it proactively to visualize the construction sequence. Another benefit is the ability to run what-if scenarios to determine optimum scheduling and resource management. Also, by linking 3D drawings to a project schedule, all project stakeholders, from the owner to the tiling subcontractor, can see how the project is supposed to progress. VirtualSTEP Products include 4D Project Navigator, Conflict Coordinator, Project Reporter, and Project Analyzer. All these products are web-based.
Pneumatic Capsule Pipeline, Purdue Ect Team
Pneumatic Capsule Pipeline, Purdue Ect Team
ECT Fact Sheets Archive
Pneumatic capsule pipeline (PCP) uses wheeled capsules (vehicles) to carry cargoes through a pipeline filled with air. Modern large diameter PCP systems utilize through flow booster pumps, also known as jet pump injectors. These create the pressure differentials required to propel multiple capsules through a pipeline, while allowing both terminals at atmospheric pressure. This is done by placing a booster pump midway along the pipeline, and designing it in such a way that capsules can bypass the pump.
Lean Project Delivery System, Purdue Ect Team
Lean Project Delivery System, Purdue Ect Team
ECT Fact Sheets Archive
The Lean Construction Institute, (LCI), founded in August 1997, is currently doing research to develop knowledge regarding the design and implementation of project based production systems in the design, engineering, and construction of capital facilities. Lean Project Delivery System (LPDS) model consists of 13 modules, 9 of which are organized in 4 interconnecting triads or phases extending from project definition to design to supply and assembly, plus 2 production control modules and the work structuring module, both conceived to extend through all project phases, and the post-occupancy evaluation module, which links the end of one project to the beginning of …
Palm Estimating, Purdue Ect Team
Palm Estimating, Purdue Ect Team
ECT Fact Sheets Archive
Estimators need a way to increase efficiency and lessen the chance for error when collecting estimate information in the field. With Palm Estimating from Timberline, users can have access to the same Precision estimating data they use in the office. Cover page information, item numbers and descriptions, assembly numbers and descriptions, WBS codes, variables and variable help can all be stored on a hand-held device. This ensures estimators have the information they need to collect all of the project details necessary to deliver an accurate, complete bid.
Hybrid Computerized Decision Support System For Infrastructure Assessment, Purdue Ect Team
Hybrid Computerized Decision Support System For Infrastructure Assessment, Purdue Ect Team
ECT Fact Sheets Archive
Currently, assessment techniques are performed subjectively, time consuming, and rely mostly on human visual inspection. Such subjective assessment methods have been identified as a critical obstacle to effective infrastructure management. The hybrid computerized decision support system for construction quality assessment applies concepts in the fields of machine learning, pattern recognition, and image processing. The system will automate the assessment process by acquiring digital images of the areas to be assessed and analyzing the images to identify and measure defects. Moreover, sample images will be used to train the system to acquire expert knowledge in identifying the defects and using this …
Radio Frequency Identification (Rfid) Tag, Purdue Ect Team
Radio Frequency Identification (Rfid) Tag, Purdue Ect Team
ECT Fact Sheets Archive
For the receipt and tracking of pipe supports material at construction jobsites, the proprietary electronic identification tags, RFID (Radio Frequency Identification) was designed and manufactured by SAT Corporation. A RFID system consist of two major components (reader and the tag) which work together to provide the user with a non-contact solution to uniquely identify people, assets, and locations.
Production Of Construction Materials Using Advanced Recycling Technologies, Purdue Ect Team
Production Of Construction Materials Using Advanced Recycling Technologies, Purdue Ect Team
ECT Fact Sheets Archive
Waste reduction, material reuse, and use of recycle-content products can be focused on the management system somewhat. In contrast, material recycling is the technical issue how to create new materials using wastes. Thus, three advanced recycling technologies; 1) Synthetic Lightweight Aggregate technology (SLA), 2) Clean Coal Technology (CCT), and 3) RP-1 Polymer Identification System are introduced.
Storm Chamber Technology For Storm Water Storage And Gray Water Management And Reuse, Purdue Ect Team
Storm Chamber Technology For Storm Water Storage And Gray Water Management And Reuse, Purdue Ect Team
ECT Fact Sheets Archive
StormChamber™ is an open bottom, arch-shaped, HDPE infiltration chamber which functions in both permeable and non-permeable soils for subsurface retention, detention, recharge and reuse of storm water, or gray water, designed to overcome the deficiencies of other technologies. It provides a higher level of nutrient and pollutant removal by taking advantage of the natural biological and physical properties of the soil. StormChamber™ systems mimic pre-development conditions by putting post-construction run off back into the ground approximately where it used to go, maintaining base flow to streams, wetlands, lakes, ponds and countering salt-water intrusion in coastal areas.
Asbestos Removal System (Envirosystem), Purdue Ect Team
Asbestos Removal System (Envirosystem), Purdue Ect Team
ECT Fact Sheets Archive
A new asbestos removal system called EnviroSystem(TM) has been developed by CUPS Systems, Inc., and GRI (Gas Research Institute). It basically comprises a portable line traveling system that is composed of a high-pressure water jet coating removal device, called HydroKleaner, a vacuum pump, a side boom, a pump sled, a process sled, and a 20 cu.yd. disposal container. The system is operated by workers wearing protective gear and clothing.
Rp-1 Polymer Identification System : Recycler Of Plastics, Purdue Ect Team
Rp-1 Polymer Identification System : Recycler Of Plastics, Purdue Ect Team
ECT Fact Sheets Archive
It has been noticed that one of the primary obstacles in recycling is the lack of sufficient means to avoid cross contamination during collection. In particular, the new method to quickly and easily identify materials has been demanded in plastic industry due to the dramatic acceleration of plastic consumption in the last forty years. SpectraCode's new technology enables the instant point-and-shoot identification of black plastics, extracting a definitive signature from most black plastics in half a second or less. This speed is achieved through a modified probe that uses a sampling technique SpectraCode calls distributed focusing. This technology, when used …