As allowed by the enforcing agency, cement used in foundation mix design shall be reduced as follows:
Tier 1. Not less than a 20 percent reduction in cement use.
Tier 2. Not less than a 25 percent reduction in cement use.
Note: Products commonly used to replace cement in concrete mix designs include, but are not limited to:
- Fly ash.
- Silica fume.
- Rice hull ash.