CONCRETE POLISHING COUNCIL POLISHED CONCRETE AGGREGATE EXPOSURE CHART
REPLACES CPAA AGGREGATE EXPOSURE CHART
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CLASS
NAME
SURFACE EXPOSURE, %
A
Cement Fines
85 – 95 % Cement Fines
5 – 15 % Fine Aggregate
B
Fine Aggregate
85 – 95 % Fine Aggregate
5 – 15 % Blend of Cement Fines and Coarse Aggregate
C
Coarse Aggregate
80 – 90 % Coarse Aggregate
10 – 20 % Blend of Cement Fines and Fine Aggregate
Aggregate exposure class denotes the surface exposure after grinding and polishing operations. The density, size and distribution of the aggregates at the surface depends on the concrete mix design and placing and fin- ishing operations. Floor flatness at the time of grinding and polishing operations is an important consideration in selecting the appropriate aggregate exposure class.
Surface exposure percentages are based on visual observation of the overall area of the polished floor.
Illustration of Differences in Class
Caution: This provides a visual representation of the differences in Class A, B and C. This may not represent the polished concrete in your area as it varies based on aggregate type, gradation, size and distribution. Consult with your CPC Polishing Contractor to see reference samples or mockups.
Contact your Concrete Polishing Council (CPC) contractor or the CPC Hotline at (844) 923-4678 or by email at cpchotline@ascconline.org with any questions.
PCAEC – 11.17 AMERICAN SOCIETY OF CONCRETE CONTRACTORS