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Construction Productivity Advancement Research (CPAR) Program. Performance of Concretes Proportioned with Pyrament Blended Cement
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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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 manufacturers 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,
APPROVED FOR PUBLIC RELEASE