Civil Engineering Reference
In-Depth Information
Table 7.28 Conditions for applications of concrete with RA (Vincke and Rousseau
1994
)
Type of aggregate
GBSB-I
GBSB-II
Concrete strength
class
C 16/20
C 30/37
Environmental class
Inside building; dry environment
Non-aggressive elements in soil and/or
no contact with freeze-thaw
conditions
Inside building; dry
environment
Non-aggressive elements in soil
and/or no contact with water
Table 7.29
Corrective factors to determine the characteristics values (Vincke and Rousseau
1994
)
Properties
GBSB-I
GBSB-II
f
ctm
1
1
Modulus of elasticity
0.65
0.8
Creep
1.5
1.25
Shrinkage
2
1.5
The conditions of application of concrete produced with these RA are presented
in
Table
7.28
and
they
are
similar
to
those
presented
by
the
RILEM
recommendation.
The corrective factors adopted for calculating the characteristics values
according to the Belgian recommendation are similar to those of the RILEM
recommendation and are presented in Table
7.29
. The same discussion presented
in
Sect. 7.2.5.2
can also be applied to these values.
7.2.9.1 PTV 406: Technical Prescriptions: ''Recycled Aggregates
from Construction and Demolition Waste''
In Belgium, the standard PTV 406 Technical Prescription ''Recycled aggregates
from construction and demolition waste'' (2003) regulates the composition of the
RA that may be used in concrete production, establishing three RA classes: RCA,
recycled masonry aggregates (RMA) and a mixture of concrete and masonry
aggregates.
According to this specification, the aggregates can be derived from construc-
tion, rehabilitation, demolition of buildings or even leftovers of NA. The com-
position of the various classes of RA is presented in Table
7.30
. The specification
notes that the requirements must be met individually.
The RA should not contain materials whose nature, shape, size and quantity can
be harmful to their use, such as clay particles, vegetable matter or refractory
bricks.
Particle size and its tolerances are provided by the manufacturer according to
the application. The limits assigned to water absorption, density and maximum
