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Articles 61 - 90 of 229
Full-Text Articles in Engineering
Surtreat - Concrete Restoration & Protection System, Purdue Ect Team
Surtreat - Concrete Restoration & Protection System, Purdue Ect Team
ECT Fact Sheets
Reinforcing steel corrosion is the most common cause of failure of concrete structures. Once started, rebar corrosion can not be stopped by simply waterproofing the surface of the concrete. Surtreat is a proprietary concrete restoration and protection system. The system includes sequential application of chemical treatments to improve the properties of the deteriorating concrete and protect new structures.
Rapid-1 Hardening Accelerator Concrete Admixture, Purdue Ect Team
Rapid-1 Hardening Accelerator Concrete Admixture, Purdue Ect Team
ECT Fact Sheets
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.
Carbon Fiber Reinforced Polymer (Cfrp) Laminates For Structural Strengthening, Purdue Ect Team
Carbon Fiber Reinforced Polymer (Cfrp) Laminates For Structural Strengthening, Purdue Ect Team
ECT Fact Sheets
Strengthening measures are required in structures when they are required to accommodate increased loads. Also, when there are changes in the use of structures, individual supports and walls may need to be removed. The pultruded CFRP laminate reinforcing consists of bonding the CFRP strip with the concrete structure using a high-strength epoxy resin as the adhesive. The CFRP strips are manufactured using a pultrusion process. The pultrusion principle is comparable with a continuous press. It provides great strength, high modulus of elasticity, and outstanding fatigue resistance It is a very lightweight non-corrosive material, that requires minimal preparation of laminates, and …
Use Of Recycled Tire Rubber In Concrete, Purdue Ect Team
Use Of Recycled Tire Rubber In Concrete, Purdue Ect Team
ECT Fact Sheets
More than 250 million scrap tires weighing more than 3 million tons are generated each year in the United States. This is considered as one of the major environmental challenges facing municipalities around the world because waste rubber is not easily biodegradable even after a long period of landfill treatment. One of the solutions suggested is the use of tire rubber particles as additives in cement-based materials. Experiments under the laboratory environments commonly presented that the use of rubber in the concrete cement mix reduced drying shrinkage, brittleness, and elastic modulus, which might improve the overall durability and serviceability of …
Smart Concrete, Purdue Ect Team
Smart Concrete, Purdue Ect Team
ECT Fact Sheets
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.
Rapid In-Situ Load Testing, Purdue Ect Team
Rapid In-Situ Load Testing, Purdue Ect Team
ECT Fact Sheets
Load tests and structural monitoring are used to gain information regarding the health and performance of an existing structure. Both are more representative than analytical approaches to evaluate the structure, especially when little is known about the structure's geometry and composition. Rapid in-situ load testing is intended to be much simpler and can be carried out in a fraction of the time and at a much lower cost. The testing procedure was originally developed at Center for Infrastructure Engineering Studies, University of Missouri-Rolla to offer a non-destructive yet conclusive demonstration of the performance of new construction techniques and technologies.
Prepacked Shotcrete Admixture : Spray-Con Ws, Purdue Ect Team
Prepacked Shotcrete Admixture : Spray-Con Ws, Purdue Ect Team
ECT Fact Sheets
Over the past 10 years, the wet shotcrete method has become increasingly used in the repair of vertical and overhead concrete surfaces. The wet shotcrete admixture products, Spray-Con, are mixed on-site with locally supplied sand and Portland cement. Spray-Con's silica fume enhanced and fiber reinforced formulations make it easy to control air entertainment in shotcrete - an important requirement for freeze/thaw durability and salt-scaling resistance.
Reactive Powder Concrete, Purdue Ect Team
Reactive Powder Concrete, Purdue Ect Team
ECT Fact Sheets
RPC represents a new class of Portland cement-based material with compressive strengths in excess of 200 MPa range. By introducing fine steel fibers, RPC can achieve remarkable flexural strength up to 50 MPa. The material exhibits high ductility with typical values for energy absorption approaching those reserved for metals.
Shrinkage Reducing Admixture For Concrete, Purdue Ect Team
Shrinkage Reducing Admixture For Concrete, Purdue Ect Team
ECT Fact Sheets
Concrete shrinkage cracking is a common problem in all types of concrete structures, especially for structures and environments where the cracks are prevalent and the repercussions are most severe. A liquid shrinkage reducing admixture for concrete, developed by GRACE Construction Products and ARCO Chemical Company, that reduces significantly the shrinkage during concrete drying and potentially reduces overall cracking over time.
Mellose Non-Dispersible Underwater Concrete Admixture, Purdue Ect Team
Mellose Non-Dispersible Underwater Concrete Admixture, Purdue Ect Team
ECT Fact Sheets
Mellose is a viscose agent based on under water Cellulose (Hydroxy Propyl Methyl Cellulose). It is commonly referred to as a a self-leveling agent that increases viscosity when is dissolved in water. It can be also described as an anti-washout concrete or non-dispersible concrete mixture. Mellose is an essential component of high performance concrete construction under water.
Self-Placing Concrete, Purdue Ect Team
Self-Placing Concrete, Purdue Ect Team
ECT Fact Sheets
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.
High Performance Concrete (Hpc), Purdue Ect Team
High Performance Concrete (Hpc), Purdue Ect Team
ECT Fact Sheets
Normal Strength Concrete (NSC) is heavy and lacks the required workability in some large concrete structures, such as high-rise buildings, bridges, and structures under severe exposure conditions. High Performance Concrete (HPC) is the latest development in concrete.
Galvashield™ - Embedded Galvanic Anodes, Purdue Ect Team
Galvashield™ - Embedded Galvanic Anodes, Purdue Ect Team
ECT Fact Sheets
Repair of chloride-contaminated or carbonated concrete structures can result in accelerated corrosion problems on the reinforcing steel in adjacent concrete areas. Galvashield XP anodes provide localized corrosion protection in reinforced concrete buildings and structures. The palm-sized anode consists of a galvanic zinc core surrounded by an active cementitious matrix. These anodes are designed to reduce the ring anode corrosion commonly associated with concrete patch repairs and delay the onset of future corrosion.
Automated Spray Pothole Patching Truck, Purdue Ect Team
Automated Spray Pothole Patching Truck, Purdue Ect Team
ECT Fact Sheets
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.
Corrosion Inhibitors For Reinforced Concrete, Purdue Ect Team
Corrosion Inhibitors For Reinforced Concrete, Purdue Ect Team
ECT Fact Sheets
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.
Stay-In-Place (Sip) Formwork, Purdue Ect Team
Stay-In-Place (Sip) Formwork, Purdue Ect Team
ECT Fact Sheets
With the recent development of composite materials, SIP system are offering architects and engineers numerous advantages over competitive systems such as maximum flexibility, cost saving, and efficient time control in the various construction field; residential, commercial, industrial building and bridge as well. SIP systems have been applied to various type of project providing various panels composed of synthetic materials such as polyvinyl chloride (PVC), galvanized coiled sheet steel, fabricated steel, carbon/epoxy thin shell and so on for the specific requirement of each project.
Movax Robotic: Hydraulic Vibratory Pile Driver, Purdue Ect Team
Movax Robotic: Hydraulic Vibratory Pile Driver, Purdue Ect Team
ECT Fact Sheets
Pile sheeting operations need auxiliary equipment and personnel to complete, while contractors have been concerned in increasing safety for crews, saving money, and efficiency. Movax is a robotic excavator mounted hydraulic vibratory pile driver. Its unique robotic articulation and side gripping ability allows the operator not only to drive and extract sheet piles, but also to pick a sheet, move it, thread it, and place it. The Movax can pick up a 50-foot sheet without releasing the sheet during these operations. This ability allows the Movax Robotic to help increasing crew safety by reducing the need of personnel in the …
Dis Seismic Isolater, Purdue Ect Team
Dis Seismic Isolater, Purdue Ect Team
ECT Fact Sheets
Seismic isolation bearings isolate a structure from the ground motion produced by an earthquake. The energy absorption devices are designed to absorb the energy associated with an earthquake. This seismic (Base) Isolator consists of alternate layers of rubber and steel bonded together, with a cylinder of pure lead tightly inserted through a hole in the middle. The rubber layers allow the isolator to easily displace sideways, reducing the earthquake loads felt by the building and its occupants. They also act as a spring, ensuring that the structure returns to its original position after the shaking has stopped.
Safespantm: Multi-Span Bridge Decking And Shielding, Purdue Ect Team
Safespantm: Multi-Span Bridge Decking And Shielding, Purdue Ect Team
ECT Fact Sheets
Contractors in bridge rehabilitation have been experiencing risks and difficulties associated with their line of work: safety and inspection issues, environmental concerns, business interruption, emergency situations, and rising labor costs. Safespan™ Multi-Span Bridge Platform System was developed by James Frangos and Lambros Apostolopoulos in 1995 to alleviate the obstacles found in bridge rehabilitation. The system designs are flexible. It uses various methods to connect the platform to the structure, depending on the bridge's configuration, that allow contractors to adjust the platform's height for a desired working clearance.
Bladepro: 3d Automatic Grade Control System, Purdue Ect Team
Bladepro: 3d Automatic Grade Control System, Purdue Ect Team
ECT Fact Sheets
Currently most of the methods to control grading equipment to achieve the required production accuracy are based on conventional surveying, such as grade stakes and stringlines. BladePro System, developed by Spectra Precision in 1998, is a dual automatic blade control system that uses advance computer technology and user friendly operator controls. This system provides contractors a three dimensional machine control system for roads, railway beds and airport runway construction.
Amir: Asphalt Multi Integrated Roller, Purdue Ect Team
Amir: Asphalt Multi Integrated Roller, Purdue Ect Team
ECT Fact Sheets
Conventional rolling equipment, such as steel vibratory rollers, while capable of achieving a specified density, results in construction induced cracks. These cracks are often visually apparent, and they are due to a mismatch between the geometry and relative rigidity of the roller and the asphalt mix. Asphalt Multi Integrated Roller (AMIR) was developed to compact asphalt and to prevent the surface cracking of pavement. AMIR was developed by replacing the cylindrical stiff shape with a moving flat softer plate which results in a crack free asphalt layer and more uniform compaction along and across the mat.
Ar2000 Super Recycler, Purdue Ect Team
Ar2000 Super Recycler, Purdue Ect Team
ECT Fact Sheets
Hot in-place recycling (HIR) is a process for rehabilitating deteriorated asphalt pavements. HIR recycling enables repaving to be 25-30% cheaper than traditional asphalt resurfacing systems and minimizes the disruption of traffic. Martec's AR2000 Super Recycler is a self-propelled equipment train, consisting of two identical Preheaters, a Heater-Miller and a Heater-Mixer as the main units totaling 210 feet (64 m) in length, with a conventional paver, a rubber-tired roller and a vibratory roller added to handle laydown and compaction. This train recycles asphalt pavement in five separate stages: preheating, hot milling, heat and stir, pugmill mixing, and laydown and compaction.
Hot In Place Asphalt Recycling (Hipar), Purdue Ect Team
Hot In Place Asphalt Recycling (Hipar), Purdue Ect Team
ECT Fact Sheets
With limited funds destined to highway maintenance, the need to repair and maintain highways at the lowest cost possible has created a need for cost-effective ways to rehabilitate existing pavements in preference of reconstruction. Hot-In-Place-Asphalt-Recycling is defined as a process of correcting asphalt pavement surface distress by softening the existing surface with heat, mechanically removing the pavement surface, mixing with recycling agent, possibly adding virgin asphalt and/or aggregate and replace it on the pavement without removing the recycled material from the original pavement site.
Asphalt Paver Engineering Control Systems, Purdue Ect Team
Asphalt Paver Engineering Control Systems, Purdue Ect Team
ECT Fact Sheets
At present, there are approximately 300,000 asphalt paving workers who are routinely exposed to asphalt fume. Presently, limited data exists concerning the level of exposure and subsequent health effects for paving workers. The engineering control method developed for highway class pavers includes ventilation systems, baffles, and enclosures to capture the generated contaminant within the paver's auger area and to exhaust it before it enters the workers' working environment.
3d-Mc Three Dimensional Machine Control, Purdue Ect Team
3d-Mc Three Dimensional Machine Control, Purdue Ect Team
ECT Fact Sheets
Construction equipment using laser control technology cannot perform curves on a road construction project. The guiding of road construction equipment in curving contours requires references such as hubs, staking, or elevated string lines. The 3D MC system uses three modules to control the piece of equipment: a total station, receiver and control system device. The main benefit of the 3D MC system is the obvious gain of productivity generated by this innovation.
Shaking Table System For Geotechnical Centrifuge, Purdue Ect Team
Shaking Table System For Geotechnical Centrifuge, Purdue Ect Team
ECT Fact Sheets
The shaking table system for geotechnical centrifuge, which can simulate sinusoidal and real seismic waves under a centrifugal force of 50 times earth gravity, is capable of providing significant data for the seismic design of structures. The shaking table can accommodate test specimens up to 250kg under 50G condition, so it can be used to perform various types of ground shaking tests.
Soft Trencher, Purdue Ect Team
Soft Trencher, Purdue Ect Team
ECT Fact Sheets
Excavation near existing electrical lines, gas lines and other underground utilities can be dangerous and time consuming. A self propelled trencher called the Soft Trencher developed by Battelle Memorial Institute, Columbus, Ohio uses supersonic air to loosen dirt which is then vacuumed up into a truck or piled into a windrow for later removal of backfill. The supersonic air used to break up the soil is harmless to underground utilities and cables. Unlike traditional excavation methods there is no downward force that can be exerted on the underground utilities.
Soil-Stiffness Gauge For Soil Compaction Control, Purdue Ect Team
Soil-Stiffness Gauge For Soil Compaction Control, Purdue Ect Team
ECT Fact Sheets
Soil stiffness and modulus are the most meaningful engineering parameters for soil structures. Until now, there were no practical and reliable means to rapidly measure the in-situ soil stiffness and elastic modulus of soils. The Humboldt Stiffness Gauge (HSG) enables both the design and construction to be controlled by the same physical parameters, namely stiffness and modulus. Used as a compaction process control tool, it brings the contractor closer to the real purpose of compaction, which is to improve the stability of the soil over the life of the structure. The HSG's sensitivity and ability to rapidly take large amounts …
Lumimark - Safety Traffic Marking System, Purdue Ect Team
Lumimark - Safety Traffic Marking System, Purdue Ect Team
ECT Fact Sheets
Masters Builders, Inc. developed Lumimark HW 100 White and Yellow, polymer-modified, cementitious safety traffic marking products. It's designed for use in edge and center line striping on concrete pavement for both mainline and secondary roads, and all striping needs on runways, taxiways and aprons at airports. This technology helped the department avoid a costly bridge replacement project by rehabilitating a steel truss bridge using lightweight composites.
Deep Mixing Method For Ground Improvement, Purdue Ect Team
Deep Mixing Method For Ground Improvement, Purdue Ect Team
ECT Fact Sheets
Many causes including presence of peats and highly organic soils in construction projects increase the risk of foundation failure or inadmissible settlements due to low strengths, high compressibility, prolonged creep, and low permeability. The Deep Mixing Method (DMM), also known in parts of the U.S. as soil mixing, is an in situ soil treatment and improvement technology mechanically blending the in situ soil with cementitious materials that are referred to as binders using a hollow stem auger and paddle arrangement.