Civil Engineering Reference
In-Depth Information
Fig. 6.3 Ratio between the
90-day splitting tensile
strengths of concrete versus
the ratio between the
densities (top), the water
absorptions (centre) of the
mixture of aggregates and the
7-day compressive strengths
of concrete (bottom)
1.10
1.05
y = -1.5773x + 1
R
2
= 0.8669
1.00
0.95
0.90
Soberón
0.85
0.80
0
0.01
0.02
0.03
0.04
0.05
0.06
1-D
RAC
/D
RC
1.05
y = -0.0294x + 1
R
2
= 0.866
1.00
0.95
0.90
0.85
Soberón
0.80
0.75
0
0.5
1
1.5
2
2.5
3
wa
RAC
/wa
RC
-1
1.10
1.05
y = -0.7122x + 1
R
2
= 0.8969
1.00
0.95
0.90
0.85
Kou et al
Soberón
0.80
0.75
0.70
-0.1
0
0.1
0.2
0.3
1-f
c7RAC
/f
c7RC
6.3.4.5 Shrinkage
Shrinkage results were obtained from the campaigns of Cervantes et al. (
2007
) and
Gomez-Soberón (
2002
) at the age of 28 and 90 days, respectively. The general
trend is that of a progressive increase of shrinkage with the inclusion of recycled
aggregates in the concrete mixes, which is explained by the higher absorption and
lower stiffness of the RA compared with the NA.
Figure
6.5
(top) shows the variation of the ratio between the 28- and 90-day
shrinkages of concrete and the ratio between the densities of the mixture of
