June 17th, 2002

LANGLEY, Canada - Results from Concrete Recovery Systems (CRS) test data show that at nominal levels of slurry density (i.e. 10% to 15% by mass) the stabilized cementitious slurry from the CRS process will provide a measurable benefit of increased strength by 3% to 6% over design requirement, with minimal impact on nominal levels of air entrainment.

While it is generally accepted that stabilized, recycled cementitious material recovered from waste cement will provide a pozolanic effect, it is another thing altogether to have a working system consistently prove this true amidst the many variables impacting daily concrete production.

Data, collected in conjunction with customer test personnel, indicates that regular use of stabilized recycled cement will generate a significant and meaningful increase in design strength, providing a consistent over- yield.

The test data also shows negligible effects on air entrainment, a factor of interest to many producers who have experienced fluctuations in air entrainment from the use of non-stabilized recycled cement. The fluctuations are likely more closely related to water addition, as more water is required when advanced hydration creates higher degrees of calcium hydroxide.

CRS process testing continues, the results of which are expected to positively impact the concrete producer facing tighter environmental restrictions.

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