Civil Engineering Reference
In-Depth Information
Table 6.1
Relationship
between
various
properties
and
compressive
strength
of
concrete
containing CDW aggregates, proposed in various studies
Property
Relationship
Reference
f
sp
= 0.0931 f
0
:
8842
cu
Splitting tensile strength
(f
sp
, f
ctm
)
Kou and Poon (
2008
)
f
sp
= 0.24 f
0
:
65
cu
Xiao et al. (
2006
)
f
ctm
¼
0
:
3 f
2
=
3
Paine et al. (
2009
)
ck
(BC50/60)
f
ctm
¼
2
:
12 ln 1
þ
f
cm
=
10
ð
ð
Þ
Þ
[ C50/60
p
f
cu
Flexural strength (f
f
)
Xiao et al. (
2006
)
f
f
¼
0
:
75
Modulus of elasticity (E)
E
¼
7770
f
0
:
33
cu
Ravindrarajah and Tam
(
1985
)
q
f
cu
2000
2300
1
:
5
Kakizaki et al. (
1988
)
q
E
¼
1
:
9
10
5
f
cu
þ
E
¼
370
f
cu
þ
13100
Dhir et al. (
1999
)
3
q
0
:
83f
cu
10
Corinaldesi (
2011
)
E
¼
18
:
2
3
q
0
:
83f
cu
10
Corinaldesi (
2010
)
E
¼
18
:
8
E
¼
909
f
cu
þ
8738
E
¼
8917
f
cu
þ
8
2345
2
Þ
1
Evangelista and de Brito
(
2007
)
q
ð
0
:
85
10
5
2
:
8
þ
40
:
1
fcu
Xiao et al. (
2006
)
E
¼
Dry density (q) f
cu
¼
0
:
069
q
116
:
1 Xiao et al. (
2006
)
f
cu
, f
ck
, f
cm
cubic compressive strength (ultimate, characteristic and mean values)
In this chapter, a methodology developed and patented by de Brito (
2007
) will
be applied to analyse experimental studies reported in the various literatures done
in various countries as well as in Portuguese researches on concrete with recycled
concrete aggregates. The description of this methodology is presented in the fol-
lowing section. The results are presented in two further sections. The following
section of this chapter summarises the knowledge acquired through past experi-
mental research on RAC performed by researchers from various countries and
statistically and graphically processes the published data, aiming at correlating the
RAC properties with the properties of the RA used to replace natural aggregates
(NA). The data collected are then systemised and some of the results in the field of
structural concrete are interpreted. A parallel study was performed using experi-
mental results done by Portuguese researchers and included in the following
section. A similar methodology to that adopted in the next international review
section was used in the Portuguese review section.
This chapter therefore describes the methodology adopted in the data pro-
cessing that leads to the estimation of the long-term behaviour of RAC. This
innovative methodology provides the building owner, the structural designer and
the builder with reliable information to render viable a process (the reuse of inert
waste in concrete production) that at the moment faces practical technological
limitations. It shifts the reuse of these materials from the currently dominant
practices that in effect lead to their down-cycling.
