Recycled Content

Reduce impacts from extraction and processing of virgin materials. Final percentage based on cost; content value of individual assemblies based on weight to determine fraction of each assembly's cost.
Rating Systems and Code Applicable Products/Systems
LEED NC LEED S LEED CS LEED H LEED R LEED ND CHPS CALGreen
MRc4
1-2 Pts.		 MRc4
1-2 Pts.		 MRc4
1-2 Pts.		 MRc3
1-4 pts.

Combines reused materials, recycled content, and regional credits		 MRc4
1-2 Pts.		 GIBc15
1 Pt.

(Unit paving)		 ME4.1
1-2 Pts.		 A4.405.3

A5.405.4

A5.405.5.2.1

A5.405.5.3.2.2
Direct support of technical goals.
  • 50% of the volume of an 8-inch concrete masonry wall is GROUT
  • Wider walls are greater than 50% grout
  • CMU are appx. 2.5 sack mixes, whereas grout is appx. a 7 sack mix
  • Greater amounts of SCM are possible in grout than in cmu
  • Grout is hidden, no effect on aesthetics
Grout is 50% and more of a concrete masonry wall, and can contain up to 50% in SCM replacement of cement.

Fifty percent or more of a concrete masonry wall is grout, which can easily contain fly ash. This is the best way to incorporate supplementary cementitious materials (SCM) recycled content into the wall, as current fly ash color-control capability renders it unsuitable for architectural masonry.

The Concrete Masonry Association of Califorina and Nevada recently conducted a study to demonstrate the effects of fly ash in masonry grout. Tests were conducted on mix designs with fly ash replacement of cement in percentages ranging from 20% to 60%. Results indicated sufficient strength development in designs with up to 50% fly ash. For more information, please contact us.

Green Credits & Strategies : Recycled Content - Pg. 2