• To reduce the carbon impacts of CMU, the two primary options are to reduce the total amount of material used and to reduce the portland cement content.
  • To reduce the material quantities, consider alternatives to fully grouted walls or overly reinforced CMU walls.
  • A few suppliers have achieved portland cement reductions by replacing a portion of the portland cement with supplementary cementitious materials (SCMs) such as fly ash and slag cement in the CMU mixture.
  • One technique to reduce the GHG footprint of masonry grout is to specify the strength method rather than the proportion method when specifying strength. The strength method typically results in significantly lower amounts of portland cement in the grout mix than the proportion method.
  • See the SEI Technical Report Structural Materials and Global Climate for further information.
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