Civil Engineering Reference
In-Depth Information
16
24
TBC = 550 kg/m
3
, w/b = 0.32
22
14
20
12
18
16
10
14
12
8
10
6
8
4
6
0.04
0.045
0.05
0.055
0.06
Sorptivity index (mm/min
1/2
)
(Based on data provided in Güneyisi et al., 2011)
9.12
The influence of MK, FA and GGBFS replacement combinations
(quaternary blends) on the sorptivity index.
FA (or GGBs) reduce to about 40-60% compared to sCC with oPC only,
the ternary and quaternary blends of FA, GGBFs and MK cause a reduction
of 70-80% (Güneyisi et al., 2011). The quaternary sCMs combination of
22.5% FA-22.5% GGBFs-15% sF provides about 45% water penetration
depth reduction (Gesoğlu et al., 2009).
The water penetration depth of sCC containing 56% GGBFs replacement
is about 40% higher than sCC containing 40% MK, after 28 days. However,
after 90 days, the situation is reversed and sCC with GGBFs replacement
exhibits only about 40% of the water penetration depth value obtained for the
sCC with MK, which indicates a possible delay in the pozzolanic reaction
compared to sCC containing MK (Vejmelková et al., 2011).
The initial absorption values of sCC with high-volume FA are slightly
higher than the normal vibrated concretes and the absorption increases with
an increase in FA replacement ratios. sCC with a high volume of 80-85%
FA replacement shows the highest water absorption capacity; around 2-9%
(Dinakar et al., 2008; Khatib, 2008). similarly, the percentage permeable
voids are also higher for sCC with high-volume FA than the normal vibrated
concretes. This may be owing to the increasing porosity resulting from the
high paste volumes, water contents and superplasticiser dosages used in sCC
containing high volume FA replacement (Dinakar et al., 2008).
The carbonation depth of sCC with 20% FA is higher than sCC containing
15% FA replacement. if the FA content is increased to 25%, carbonation depth
decreases. Carbonation depth becomes almost constant for sCC containing
25-35% FA at 90 days (siddique, 2011). Research into the variation of
carbonation depth of sCC in terms of the different initial water-curing period
