You rely on LEEDuser. Can we rely on you?
LEEDuser is supported by our premium members, not by advertisers.
Go premium forForum discussion
NC-2009 MRc4: Recycled Content
See LEEDuser’s guidance on NC-2009 MRc4 »
Reinforcement Steel in concrete
Add new comment
To post a comment, you need to register for a LEEDuser Basic membership (free) or login to your existing profile.
See all forum discussions about NC-2009 MRc4
Subscribe to new posts about NC-2009 MRc4
Post a new question about NC-2009 MRc4
See LEEDuser’s guidance on NC-2009 MRc4 »
FAQs about MRc4:
The recycled content percentage on the product data sheet is given as a range. What should I do?
Is the default average recycled content value of 25% for steel still allowed?
Can site materials, such as soil, be included in the MR credit calculations?
Are there recycled content claims that I should be wary of?
Jon Clifford
LEED-AP BD+CGREENSQUARE
LEEDuser Expert
327 thumbs up
October 8, 2014 - 4:42 pm
Are you referring to precast concrete that has been fabricated off-site, where the rebar has been cast into the concrete before delivery?
Or are you asking about reinforcing steel for cast-in-place concrete? Such reinforcing is delivered to the site separately and set in place inside forms. Concrete is then poured on-site into the forms around the rebar.
Lise Dannesboe
COWI86 thumbs up
October 9, 2014 - 10:16 am
Hi Jon, thanks for your reply. Most of the concrete elements are precast. Only a small part of it is cast on site.
I understand that the steel in precast concrete has to calculated as part of the assembly reinforced concrete, is that correct?
Then only the steel in on-site cast concrete can be calculated by means of cost only?
Jon Clifford
LEED-AP BD+CGREENSQUARE
LEEDuser Expert
327 thumbs up
October 9, 2014 - 10:33 am
Exactly!
In precast concrete, all components are assembled off-site, so the cost includes all components. In this case, calculate the recycled content as described in the Reference Guide under the heading “Calculating Assembly Recycled Content.” For this calculation, you will need to know the total cost for the precast items (including fabrication) and the total weight (mass) and recycled content percentages of each component (steel, cement, SCMs, sand, aggregates, water, admixtures, and any other accessories cast into the work).
If the concrete supplier is willing to break out the total cost for cementitious material, you can use the Supplementary Cementitious Materials Calculation for that portion of the concrete.
For the steel in cast-in-place concrete, calculate recycled content separately from concrete based on steel costs.
Lise Dannesboe
COWI86 thumbs up
October 9, 2014 - 10:36 am
Thanks