Gabions as a non-concrete application
Technical Clarification Number
For the additional 3rd point of credit Mat-5 as it relates to “non-concrete applications (e.g. stone sub-soil drains, road layerworks and backfill, etc.)”, the GBCSA confirm that gabions can be excluded as they are deemed to not be aggregates for the purposes of this credit.
Definition of non-structural in-situ concrete
Under MAT 5, to achieve the additional 3rd point:
1) 10% of all aggregate used for structural (concrete) purposes is to be recycled aggregate (equivalent to Class 1 RCA as per Australian standard HB155-2002) or slag aggregate; AND
2) No virgin aggregates are used in non-structural in-situ concrete applications (e.g. (concrete) footpaths, (concrete) curbs, (concrete) backfilling to service tranches, etc.) and non-concrete applications (e.g. stone sub-soil drains, road layerworks and backfill, etc.)
The definition of non-structural in-situ concrete is, according to GBCSA, ‘not forming part of any load bearing or engineered element that is poured on site’. And similarly the definition of structural concrete, according to the GBCSA, is ‘forming part of any load bearing or engineered element’. A structural engineer can determine on a project how this definition applies to specific applications.