Civil Engineering Reference
In-Depth Information
with MK requires more water and superplasticiser than sCC with GGBFs
to comply with requirements (Vejmelková et al., 2011).
in order to achieve similar filling ability, and to maintain the constant
slump flow and V-funnel time values compared with the control mix, a
reduction in superplasticiser dosage and an increase in the amount of water
might be required for sCC containing a high volume of FA (liu, 2010).
sCC with high-volume sCMs provides much lower slump flow time values,
especially when FA is used (Gesoğlu and Özbay, 2007).
Figure 9.1 summarises some of the results in the current literature, which
indicate that the superplasticiser dosage usually decreases with an increase
in FA content (nehdi et al., 2004; sukumar et al., 2008; Gesoglu et al.,
2009, 2011; liu, 2010). The superplasticiser dosage increases as the water
to binder ratio and the FA replacement level decrease (Bouzoubaa and
lachemi, 2001).
9.4 Mechanical properties of self-compacting
concrete (SCC) with high-volume
supplementary cementitious materials (SCMs)
some researchers have explored the possibility of designing sCC with high-
volume FA replacement values according to the required strength grades.
The results show that the strength of sCC with an FA content of 50-70%,
even at 28 days, is sufficient for use in reinforced concrete construction
(Dinakar et al., 2007). sCC with lower strength grades of 20-30 MPa can be
produced by using FA replacement ratios of 70-85%. Higher-strength grades
1.4
Güneyisi et al. (2011)
Liu (2010)
Gesog
˘
lu et al. (2009)
Sukumar et al. (2008)
1.2
1.0
0.8
0.6
0.4
0.2
0
20
40
60
80
100
120
FA replacement ratio (%)
9.1
The influence of FA replacement ratio on superplasticiser dosage.
