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CPAR
- HIGH-PERFORMANCE BLENDED-CEMENT SYSTEM (PYRAMENT)
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 Eighteen specimens of concrete made with Pyrament Blended Cement - Extended Setting Time (PBC-XT) were placed on the exposure rack in August 1990 as a part of a Cooperative Research and Development Agreement between the U.S. Army Corps of Engineers and Lone Star Industries under the Corp's Construction Productivity Advancement Program (CPAR). |
Six different concrete mixtures were used for making the specimens, and three specimens were prepared from each of the concrete mixtures. Two coarse aggregate types and three cement contents were used in preparing the different concrete mixtures as shown in Concrete Mixture Table.The two coarse aggregate types were a natural river gravel and a crushed limestone. A natural sand fine aggregate was used for all mixtures. Aggregate gradings are presented in Aggregate Grading Table. The cement contents were 6.0 sacks/yd3 (594 lb/yd3), 7.0 sacks/yd3 (658 lb/yd3), and 8.0 sacks/yd3 (752 lb/yd3). The mixing water was adjusted to obtain a slump of 4½ + ½ in. No admixtures were added to the concrete mixtures, because the cement manufacturer states that the cement is a complete cement system without the need for addition of admixtures. | |