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NC-2009 MRc4:Recycled Content

Material reuse in concrete

Three question regarding recycled content in concrete: *If the concrete contains brick chips from reused bricks will it count towards recycled content. *The cement in the concrete contains fly ash. Will it count towards recycled content? *When we calculate the value of the cost of recycled material, do we calculate based on the original cost of that particular material? Thank you for taking the time to answer.

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Joseph Ford, AIA
Architect
RSP Architects Ltd.
LEEDuser Basic Member
14 thumbs up

Mon, 05/20/2013 - 20:01

Question 1: Yes. Post-consumer if salvaged from demolition. Pre-consumer if, for example, culled waste from a brick kiln. Question 2: Yes. It is counted as pre-consumer. Question 3: Calculate the value of the recycled content as a percentage of the weight of the concrete. Example: If you have $1000 of concrete and brick chips + fly ash = 30% of the unit weight, then the sustainable material value is $300. In other words: Calculate as percentage by weight of the finished product, not the actual cost of the raw materials.
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LEEDuser Expert
472 thumbs up

Mon, 05/20/2013 - 20:25

I would just add that to Joseph’s thorough answer that you should look at the special calculations for Supplementary Cementitious Materials Calculation in the BD&C LEED Reference Manual (page 373 of first edition) for the fly ash. The calculations are based on the mass of the cementitious materials only - rather than the entire concrete mix. This calculation works in your favor and it is worthwhile to use it.

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