Civil Engineering Reference
In-Depth Information
Table 7.41
Categories for the constituents of coarse recycled aggregates (prEN 933-11 2006)
Constituents
Limiting content
(% by mass)
Category
Constituents
Limiting content
(% by mass)
Category
R
C
C90
R
C
90
R
B
B10
R
B
10
C70
R
C
70
B30
R
B
30
\70
R
C
declared
B50
R
B
50
No requirements
R
C
NR
[50
R
B
declared
R
C
? R
U
C90
R
CU
90
No requirement
R
B
NR
C70
R
CU
70
R
A
B1
R
A
1-
C50
R
CU
50
B5
R
A
5-
\50
R
CU
declared
B10
R
B
10-
No requirements
R
CU
NR
FL
NS
B0,01
FL
NS
0.01
FL
S
? FL
NS
B1
FL
total
1
B0,05
FL
NS
0.05
B3
FL
total
3
B0,1
FL
NS
0.1
X ? R
G
B0.2 X R
G0.2
B0.5 X R
G0.5
B1 X R
G1
Constituents (according to prEN 933-11): R
C
concrete, concrete products and mortars; R
U
unbound aggregates, natural stones and aggregates treated with hydraulic binders; R
A
bituminous
materials; R
B
masonry units of clay-based materials (bricks, tiles, etc.), masonry unit of calcium
silicate-based materials, non-floating cellular concrete; R
G
glass; FL
s
floating stone materials;
FL
NS
stony materials that do not float; X deleterious materials, cohesive materials, plastics,
rubber, ferrous and non-ferrous metals, putrescible materials
Table
7.41
presents the classes defined for the constituents of coarse RA. These
classes are defined according to prEN 933-11, ''Tests for geometrical properties of
aggregates-Part 11: Classification test for the constituents of coarse recycled
aggregates''. This standard specifies a method in order to estimate the relative
proportions of the constituent materials in these aggregates. The classification is
based on separating particles from a portion of coarse RA into five classes rep-
resented by a letter: bituminous mixtures (A); masonry (B); concrete (C); unbound
aggregate (U) and others (X).
Although this document may create future prospects for the use of RA, it is not
official which are the requirements for recycled aggregate and their conditions of
application in concrete, so it is not possible to say whether this amendment will
induce the use of recycled aggregates other than in non-structural concrete.
7.3 Documents Overview
Although the standards reflect different trends and viewpoints, it is possible to
identify a pattern in the parameters for the main norms. Therefore, they are
summarised in three different groups: the first concerns aggregate and their clas-
sification; the second presents the most relevant requisites; finally, the third
compares the conditions for using RA in concrete.
