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Figure 7.18 Percentage increase in CBR versus different percentages of cement and silica fume ( after
Kalantari et al. , 2010).
Figure 7.19 UCS values for different percentages of ordinary Portland cement and silica fume for
unsoaked and soaked samples.
From the results of UCS test (Figure 7.19), it is observed that;
( a) Use of 10% silica fume in three months air cured, 15% OPC treated stabilized
fibrous peat increases the unsoaked and soaked UCS values by 10% (from 300
to 330 kPa) and 72% (from 96 to 165 kPa), respectively, compared with when
it is stabilized with only 15% OPC.
( b) UCS values of the samples increase with an increase in cement content.
( c)
5% silica fume along with 25% OPC has caused the 90 days UCS of unsoaked
and soaked stabilized samples to increase by 15% (from 332 to 381 kPa) and
17% (from 268.5 to 315 kPa) respectively.
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