Civil Engineering Reference
In-Depth Information
Table 7.35 Requirements for concrete with recycled aggregates (Roos
2002
)
Type of concrete/exposure condition
GP1
tested
GP1 not
tested
GP2
Concrete with recycled aggregate
[4mm
Up to 100 %
Concrete with recycled aggregate
\4mm
Up to 20 %
Allowed maximum strength class
40 MPa
20 MPa
Exposure conditions
Low to moderate
aggressive conditions
Low aggressive
conditions
Table 7.36 Requirements for recycled aggregates to be used in high-strength concrete (JIS A
5021 2005, cited by Mueller
2007
)
Properties
Coarse recycle aggregates
Fine recycle aggregates
Dry density (kg/m
3
)
C2,500
C2,500
Water absorption (%)
B3.0
B3.5
Abrasion (%)
B35
n.d.
Materials \75 lm (%)
B1.0
B7.0
Solid volume to evaluate the particle
shape (%)
C55
C53
Chlorides content (%)
B0.04
Table 7.37 Acceptable maximum contaminants content in recycled aggregates to be used in
high-strength concrete (JIS A 5021 2005, cited by Mueller
2007
)
Category
Contaminants
Limits (% by weight)
A
Roof tiles, bricks, ceramics, concrete, asphalt
2.0
B
Glass
0.5
C
Gypsum plaster
0.1
D
Other inorganic materials
0.5
E
Plastics
0.5
F
Wood, papers, bituminous materials
0.1
Total
3.0
7.2.11.3 Russia
In 1984, the former Soviet Union introduced a specification, developed by a
scientific research institute, for the use of RA in plain and reinforced concrete.
Regarding the scope of the standard, it specifies that the replacement ratio of
NA by RA can reach 100 %, if the concrete is used in foundations or reinforced
concrete with strength below 15 MPa. If the replacement ratio is not more than
50 %, it can be applied in concrete structures with strength over 20 MPa. The use
