UpCodes logo
Jump To Full Code Chapter
Use concrete made with one or more supplementary cementitious materials (SCM) conforming to the following standards:
  1. Fly ash conforming to ASTM C618, Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete.
  2. Slag cement (GGBFS) conforming to ASTM C989, Specification for Use in Concrete and Mortars.
  3. Silica fume conforming to ASTM C1240, Specification for Silica Fume Used in Cementitious Mixtures.
  4. Natural pozzolan conforming to ASTM C618, Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete.
  5. 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.
  6. 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 RequirementsPercent
    Sulfur Trioxide (SO3)1.5 max.
    Loss on ignition1.2 max.
    Available Alkalies (as Na2O) equivalent1.5 max.
    Physical RequirementsPercent
    Particle size distribution
      Less than 3.5 microns50
      Less than 9.0 microns90
    Strength Activity Index with portland cement
      7 days95 (minimum % of control)
      28 days110 (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.
  7. 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 RequirementsPercent
    Silicon Dioxide (SiO2) + Aluminum Oxide (Al2O3)92.0 min.
    Calcium Oxide (CaO)1.0 max.
    Sulfur Trioxide (SO3)1.0 max.
    Loss on ignition1.2 max.
    Available Alkalies (as Na2O) equivalent1.0 max.
    Physical RequirementsPercent
    Particle size distribution
      Less than 45 microns95
    Strength Activity Index with portland cement
      7 days100 (minimum % of control)
      28 days100 (minimum % of control)
  8. Other materials with comparable or superior environmental benefits, as approved by the Engineer of Record and enforcing authority.
A5.405.5.2.1.1 Mix Design Equation
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.
(Equation A5.4-14)
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.

Related Code Sections