Pyrament

http://geopolymerhouses.wordpress.com/2011/06/28/pyrament/

This is a type of geo-polymer cement (Trademark of an American Company) giving very high & very early strength of concrete. This is blended hydraulic cement in which no chlorides are added during manufacturing process. The cement is being used for rapid repair of airfields. US Air Force used this type of cement to build and equip temporary military airports in very short time.

The Pyrament® blended-cement is the ideal material for repairing runways made of concrete, industrial pavements, and highway roads. In the case of a runway, 4-6 hours hardening is enough to allow the landing of an Airbus or a Boeing. The geo-polymeric cement reaches a compression strength of 20 Mpa after 4 hours, whereas plain concrete gets to this strength after several days.

If we compare in a microscope the structure of concrete made of regular cement with another sample made of geopolymer cement, we notice that the regular cement is a coarse stacking of grains of matter. This causes cracks and weaknesses. Whereas concrete made of geo-polymer cement (in black) is smooth and homogeneous. This provides, in fact, superior assets.

Source: ConcreBasics.org

Construction Productivity Advancement Research (CPAR) Program. Performance of Concretes Proportioned with Pyrament Blended Cement

Abstract:
Pyrament Blended Cement (PBC) is known in the construction industry for its ability to gain strength rapidly and achieve very high early strength. The Waterways Experiment Station (WES) conducted a laboratory evaluation of concretes made with PBC to determine if these concretes perform better than concretes made with ordinary portland cement (OPC) in tests of various aspects of concrete durability. For this study, six concretes based on PBC-XT were proportioned with three cement contents and two aggregate types. The objective was to determine if the cement, advertised as giving high early strength and marketed initially as a rapid-construction material, is durable enough to justify its use for long-term performance in addition to shorter construction time. Concretes prepared from PBC-XT cement were subjected to analyses of its resistance to damage during cycles of freezing and thawing, expansion in a high- sulfate environment, damage from underwater abrasion, penetration of dissolved chlorides, scaling from deicing chemicals, and expansion from chemical interaction between alkalies in the cement and silica in aggregate. In all categories, the PBC-XT cement concretes achieved or exceeded expected performance based on the manufacturer’s product literature. In all but the last category, PBC-XT concretes performed better than is generally expected of high- quality OPC concretes. Concrete permeability, High-early strength, Rapid-setting concrete. Blended hydraulic cement, High-performance concrete, Durability, Rapid chloride permeability,


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