reactive powder concrete
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08-02-2010, 06:58 PM
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08-02-2010, 11:20 PM
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Reactive Powder Concrete.ppt (Size: 637.5 KB / Downloads: 251)
The world production of cement in 2007 was about 2.6 billion tons, compared to just 10 million tons in 1990. Traditionally, concrete was understood as a mixture of cement, water and aggregate but in modern concrete other constituents may also be present such as mineral components, chemical admixtures and fibres. Normal and high strength concretes were developed in the early 1900s and 1950s, respectively, whereas the development of ultra-high- performance concrete known as reactive powder concrete (RPC) was originated in the mid 1990 Reactive powder concrete (RPC), is a composite material with compression strength up to 170 N/mm2 is presented. The components for the RPC mixture are cement, fine aggregate, steel fibers, silica fume and super-plasticizer. They are carefully selected to achieve the optimal mixture. As well as mechanical properties the durability parameters were can be test by(gas permeability test, capillary water test).due to very high compression strength RPC can be used for big spans.RPC also has superb durability parameters such as abrasion resistance and reduced chloride permeability.this durability enhancements decrease maintenance costs and lengthen the service life of a structure
Joined: Jul 2011
02-02-2012, 11:24 AM
Reactive Powder Concrete
Reactive Powder Concrete2.ppt (Size: 637.5 KB / Downloads: 62)
What is it?
What does it do?
What is its applicability?
What kind of research is being done on it?
Why should we care?
Where is it headed?
Current High Strength Concrete
High performance concrete can be made to have strengths in excess of 30,000-40,000 psi.
Use either a mix of superplasticizer, silica fume, and extra-hard aggregate (calcined bauxite or granite) or “Macro Defect Free polymer pastes”
Still brittle, low ductility
RPC is able to obtain its improved properties by using a very dense mix, consisting of fine particles and fibers.
Low w/cm ratio : 0.16 to 0.24 (as low as 0.13)
Type 20M (like type II) Portland cement (no C3A less HoH)
Silica fume (25% by weight)
High dosages of superplasticizer
Fine quartz sand (150-600μm) (SG=2.75)
Steel fibers (2.5-10% by volume) for toughening
No rebar needed!
Cured in steam bath for 48 hrs @ 190ºF (88ºC) after initial set, placed under pressure at the molding stage
RPC’s properties, especially its high strength characteristic suggests the material might be good for things needing lower structural weight, greater structural spans, and even in seismic regions, it outperforms normal concrete. Below are a few examples of real-world applications, though the future possibilities are endless.
First bridge that used RPC was a pedestrian bridge in Sherbrooke, Quebec, Canada. (33,000 psi ~230MPa) It was used during the early days of RPC production. Has prompted bridge building in North America, Europe, Australia, and Asia.
Portugal has used it for seawall anchors
Austrailia has used it in a vehicular bridge
France has used it in building power plants
Qinghai-Tibet Railway Bridge
Shawnessy Light Rail Transit Station
Basically, structures needing light and thin components, things like roofs for stadiums, long bridge spans, and anything that needs extra safety or security such as blast resistant structures
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