Waste reduction final report -4 - Test Input

The allowed use of the six secondary construction materials is defined by the guideline for
mineral construction waste as follows in Figure 7. Construction waste for recycling is present
in unbound (e.g. excavation rock), hydraulic bound (e.g. concrete) or bituminous bound (e.g.
asphalt) form.
Table 7: Allowed use of the six recycling materials as to the guideline for mineral based
construction waste. Grey: Use not allowed [FOEN 2006].
Recycling
material / Use
possibilities
Recycled
asphalt
aggregates
Recycling
gravel sand P
Recycling
gravel sand A
Recycling
gravel sand B
Recycled
concrete
aggregates
Mixed C&D
waste granules
Use in unbound form
Without With coating
coating
30 31
Use in bound form
Hydraulic Bituminous
bound bound
These constraints are based on environmental and technological considerations. For example,
leaching of possible pollutants wants to be avoided by the prohibition of use without coating
for four of the materials. Even if these constraints are still functional as to [Hoffmann and
Dr.Jacobs 2007] they will need constantly customisation in view of allowed contaminations.
A new revision of the guideline will be made after the new TVA has been established.
The appendix contains a table out of the Swiss Norm SN 670 062 on secondary construction
materials, their composition, their application areas and environmental constrictions (in
German). The use in unbound form is mainly an application in civil engineering. Roads and
squares are underlayed with basal material, or there are made backfills of dams or
replenishments of gravel pits and construction sites. Bituminous bound material is used as
coatings. The study mentioned before [VSS 2002] presented percentages for each of these
classifications: 53% of all recycling materials are used without coating, 6% with coating.
Products going into concrete production or coverings account for about 20% each.
All of these six materials are mainly offered in similar forms as gravel and therefore hold a
substitutional function for gravel. In many cases, the material is not bound, which could
include a higher risk of leaching of pollutors. However, [VSS 2002] claims that this would
only be the case at illegal backfills. Backfilling with unconditioned construction waste
mustn’t be done in Switzerland. This is basically widely accepted and done; however, the
30 Use is possible under the condition that the layer thickness amounts to a maximum of 7 cm and if the recycled
asphalt aggregates are milled.
31 Use is possible only if used as road sub-base and base material under a bituminous coating.
102