Cement shall comply with one of the following standards:
- Portland cement shall meet ASTM C150, Standard Specification for Portland Cement.
- Blended cement shall meet ASTM C595, Standard Specification for Blended Hydraulic Cement or ASTM C1157, Standard Performance Specification for Hydraulic Cement.
- Other Hydraulic Cements shall meet ASTM C1157, Standard Performance Specification for Hydraulic Cement.
Use concrete made with one or more supplementary cementitious materials (SCM) conforming to the following standards:
- Fly ash conforming to ASTM C618, Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete.
- Slag cement (GGBFS) conforming to ASTM C989, Specification for Use in Concrete and Mortars.
- Silica fume conforming to ASTM C1240, Specification for Silica Fume Used in Cementitious Mixtures.
- Natural pozzolan conforming to ASTM C618, Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete.
- Blended supplementary cementitious materials conforming to ASTM C1697, Standard Specification for Blended Supplementary Cementitious Materials. The amount of each SCM in the blend will be used separately in calculating Equation A5.4-1. If Class C fly ash is used in the blend, it will be considered to be “SL” for the purposes of satisfying the equation.
Ultra-fine fly ash (UFFA) conforming to ASTM C618, Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete and the following chemical and physical requirements:
Chemical Requirements Percent Sulfur Trioxide (SO3) 1.5 max. Loss on ignition 1.2 max. Available Alkalies (as Na2O) equivalent 1.5 max. Physical Requirements Percent Particle size distribution Less than 3.5 microns 50 Less than 9.0 microns 90 Strength Activity Index with portland cement 7 days 95 (minimum % of control) 28 days 110 (minimum % of control) Expansion at 16 days when testing job materials in conformance with ASTM C1567* 0.10 max. * In the test mix, cement shall be replaced with at least 12% UFFA by weight.
Metakaolin conforming to ASTM C618, Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete, the following chemical and physical requirements:
Chemical Requirements Percent Silicon Dioxide (SiO2) + Aluminum Oxide (Al2O3) 92.0 min. Calcium Oxide (CaO) 1.0 max. Sulfur Trioxide (SO3) 1.0 max. Loss on ignition 1.2 max. Available Alkalies (as Na2O) equivalent 1.0 max. Physical Requirements Percent Particle size distribution Less than 45 microns 95 Strength Activity Index with portland cement 7 days 100 (minimum % of control) 28 days 100 (minimum % of control) - Other materials with comparable or superior environmental benefits, as approved by the Engineer of Record and enforcing authority.
Use any combination of one or more SCM, satisfying Equation A5.4-14. When ASTM C595 or ASTM C1157 cement is used, the amount of SCM in these cements shall be used in calculating Equation A5.4-14.
Exception: Minimums in mix designs approved by the Engineer of Record may be lower where high early strength is needed for concrete products or to meet an accelerated project schedule.
where:
| F | = | Fly ash, natural pozzolan or other approved SCM as a percent of total cementitious material for concrete on the project. |
| SL | = | GGBFS, as a percent of total cementitious material for concrete on the project. |
| UF | = | Silica fume, metakaolin or UFFA, as a percent of total cementitious material for concrete on the project. |
Concrete made with one or more of the following materials:
- Blast furnace slag as a lightweight aggregate in unreinforced concrete.
- Recycled concrete that meets grading requirements of ASTM C33, Standard Specification for Concrete Aggregates.
- Other materials with comparable or superior environmental benefits, as approved by the engineer and enforcing authority.