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Full-Text Articles in Engineering
Snap-Tite Composite Column Reinforcement, Purdue Ect Team
Snap-Tite Composite Column Reinforcement, Purdue Ect Team
ECT Fact Sheets
Recent earthquakes throughout the world have demonstrated the vulnerabilities of older reinforced concrete columns to seismic deformation demands. The Snap Tite Composite Column Reinforcement strengthens a concrete column by confining it in an external composite jacket, which prevents the concrete from expanding during seismic activity or prolonged freeze-thaw cycles. The pre-manufactured fiberglass jacket is comprised of glass fibers and corrosion resistant isopolyester resins.
Simcon: Slurry Infiltrated Mat Concrete, Purdue Ect Team
Simcon: Slurry Infiltrated Mat Concrete, Purdue Ect Team
ECT Fact Sheets
The cost of civil infrastructure constitutes a major portion of the national wealth. Its rapid deterioration has thus created an urgent need for the development of novel, long-lasting and cost-effective methods for repair, retrofit and new construction. A promising new way of resolving this problem is to selectively use advanced composites, such as High-Performance Fiber Reinforced Cementitious Composites (HPFRCCs). The investigations conducted in North Carolina University have demonstrated that a special type of continuous fiber-mat HPFRCC, called SIMCON which stands for Slurry Infiltrated Mat Concrete, is well suited for the development of novel repair, retrofit and new-construction solutions that lead …
Snap Joint Technology For Composite Structures, Purdue Ect Team
Snap Joint Technology For Composite Structures, Purdue Ect Team
ECT Fact Sheets
The optimum composite joint design is the one capable of distributing stresses over a wide area rather than to concentrate them at a point. Adhesively bonded joints can satisfy these requirements, however, most of the adhesives are brittle, and brittle failure is unavoidable. This was the motivation of developing what is called the SNAP joint. The snap joint technology developed by W. Brandt Goldworthy & Associates, Inc. The concept is based on similar joining technology used for connecting wooden parts (wood is considered as natural orthotropic composites). Also, this technique is very similar to techniques which were used a decade …
Steel-Free Concrete Bridge Deck, Purdue Ect Team
Steel-Free Concrete Bridge Deck, Purdue Ect Team
ECT Fact Sheets
Eliminating corrosion makes concrete deck slabs virtually maintenance-free, which makes life cycle costs of steel-free concrete decks much lower than reinforced concrete decks. In response, compressive membrane forces develop in the concrete deck. Ultimate load can be greater than the load at which the same deck would fail if it were reinforced conventionally.
Pothole Repairing Compound : Bondade Tcu-31, Purdue Ect Team
Pothole Repairing Compound : Bondade Tcu-31, Purdue Ect Team
ECT Fact Sheets
Conventional asphalt-based tacking materials such as hot asphalt-cement, cutbacks or emulsions cannot be applied without specialized spraying and heating equipment. With current methods of repair, nearly half of the potholes filled today will fail within six months. Bondade uses readily available spraying equipment to wet the surface and develop a tenacious bond between the asphalt and the existing substrate. It is an environmentally safe and non-hazardous material that may be used with hot or cold asphalt concrete, under damp or dry conditions and on nearly all surfaces.
Use Of Composite Piping Offshore, Purdue Ect Team
Use Of Composite Piping Offshore, Purdue Ect Team
ECT Fact Sheets
The high cost to replace steel piping in retrofit applications and increased longevity in new construction is driving the search for composite materials which are able to withstand the severe conditions experienced by offshore facilities. Advantages of composite piping compared to steel piping are: inherent corrosion resistance, lighter weight, ease of fabrication, lower maintenance costs, and lower life cycle costs.
Precast Inverted T Beam, Purdue Ect Team
Precast Inverted T Beam, Purdue Ect Team
ECT Fact Sheets
Current systems are either costly or time consuming to erect and have limitations. Cast-in-place slabs have become too expensive and time-consuming due to extensive field formwork. The Nebraska Inverted Tee (IT) system was designed for use by small contractors in sparsely populated areas where relatively modest erection equipment exists. The ITs were developed in "hard" metric units, i.e., using round-figure millimeters.
Italgrip System, Purdue Ect Team
Italgrip System, Purdue Ect Team
ECT Fact Sheets
The ever increasing number of registered vehicles has resulted in, up until the present time, a parallel increase in the number of road accidents. One of the reasons for this is that the quality of the road surface has not adequately kept pace with the increased volume of traffic. The Italgrip System increases skid resistance, reduces hydroplaning risk, reduces noise, and reduces salt consumption and can be applied to asphalt, concrete, or steel surfaces. It has been applied to several roadways in Europe, particularly road sections exhibiting problem areas.
New Structural Material - Fiber Reinforced Plastics, Purdue Ect Team
New Structural Material - Fiber Reinforced Plastics, Purdue Ect Team
ECT Fact Sheets
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 …
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.
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.
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.
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.
Autoclaved Aerated Concrete, Purdue Ect Team
Autoclaved Aerated Concrete, Purdue Ect Team
ECT Fact Sheets
High energy costs, increasingly expensive construction labor and equipment, and a higher environmental consciousness of home owners, has forced home builders to search for new construction materials. Autoclaved Aerated Concrete (AAC) is well known as an environmentally friendly construction material. Compared to the energy consumed in production of many other basic building materials, only a fraction is required to produce AAC. Raw material consumption is very low for the amount of finished product produced.
Bone-Shaped Short Fiber Composite, Purdue Ect Team
Bone-Shaped Short Fiber Composite, Purdue Ect Team
ECT Fact Sheets
Civil engineers use steel, fiberglass and other similar materials to increase concrete's strength and toughness, but using those materials often requires costly construction techniques. Short-wire reinforced concrete should become a favorite technology since the process is compatible with standard construction processes and the steel used for the bone-shaped fibers is relatively cheap. Researchers at Department of Energy's Los Alamos National Laboratory have discovered that enlarging the ends of small fibers mixed into concrete substantially increases the material's overall strength and toughness.
Polymer Concrete Pipes, Purdue Ect Team
Polymer Concrete Pipes, Purdue Ect Team
ECT Fact Sheets
Materials are needed for piping applications that have high strength and are resistant to corrosive chemicals. Polymer concrete pipes are one solution to this problem. These pipes are made by mixing a high strength, thermosetting resin with oven-dried aggregate to form a type of concrete. The resin within the mix provides for bonding the aggregate much like Portland Cement does in traditional concrete pipes.
New Infrastructure Repair Method - Fiber Reinforced Plastics, Purdue Ect Team
New Infrastructure Repair Method - Fiber Reinforced Plastics, Purdue Ect Team
ECT Fact Sheets
As the United States infrastructure gets older, the need for repair and rehabilitation increases. Most of the constructed facilities are deteriorating at a rate faster than they can be repaired. Thermal setting resins and fiber rods and sheets are being used to repair and upgrade structural systems. High-strength FRP fabric can be wrapped with relative ease around a bridge pier, a concrete column, or a concrete beams. They are primarily used to stiffen columns and beams and to repair deteriorated concrete components.
Low Temperature Concrete Admixture, Purdue Ect Team
Low Temperature Concrete Admixture, Purdue Ect Team
ECT Fact Sheets
Performing construction processes under the cold weather condition requires construction engineers to plan operations considering low temperature condition. Concrete admixture mostly chemically interact with the constituents of concrete and affect the properties and characteristics of the fresh and hardened concrete and its durability. The purposes of the admixtures include water reduction, high strength, corrosion protection, crack control, finish enhancement, flowability, etc. One of the interesting and useful purposes is protection against freeze.
Conductive Concrete, Purdue Ect Team
Conductive Concrete, Purdue Ect Team
ECT Fact Sheets
Concrete has been used for many years as a composite material that has excellent mechanical properties and durability for construction. However, concrete is a poor electrical conductor, especially under dry conditions. Traditional methods can warm roads, but installation cost is high and the procedure is complicated. A research team in Material Laboratory of Institute for Research in Construction, National Research Council Canada, led by Dr. James J. Beaudoin, has developed a new conductive concrete with both superior electrical conductivity and mechanical properties.