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To characterize the strength behaviour of
stabilized peat, 6 sets of specimens of different curing period; 14 and 28 days
were prepared. Each set of samples are consisted of 100 g of burnt peat sample
with natural (field or in situ) moisture content plus 25 g of mineral soil
filler (m.s.f) as a filler and 20 g of Ordinary Portland Cement (OPC) as a
binder. Samples 38 mm in diameter and 76 mm in length were used in the
experiment as described in Zulkifley et al. (2014a and 2014b). The specified
amounts of OPC and m.s.f were added to the natural burnt peat soil and then
mixed well until it is achieve homogeneity. The mixtures were placed in three
successive layers in an unconfined compression strength mold with an inside
diameter of 38 mm and a minimum length/diameter ratio of 2. Each of the three
layers of the sample were given ten constant full thumb pressures of approximately
10 s, as used in Sweden for compacting stabilized peat samples in the molds as
explained by Axelsson et al. (2002) and Zulkifley et al. (2014). The samples then were trimmed at both ends and keep at
room temperature for the air-curing procedure. With the Air Curing Technique,
the sample of stabilized peat were kept at normal room temperature of 30 ± 2 °C
and out of reach of water intrusion during the curing period. This technique
was used to strengthen the stabilization of peat or organic soil samples by
reduced of gradual moisture content, instead of the usual water curing and
water submergence technique method which has been practiced of previous research
for peat stabilized with addition of cement as described by Axelsson et. Al
(2002), Janz and Johansson (2002), Duraisamy et. al (2007), Abu Bakar (2008),
Behzad and Bujang (2008), Wong (2010), Tarmizi et. al (2014) and Zulkifley et.
al (2014). Previous experiment conducted by Behzad and Bujang (2008) are using
air curing technique on peat stabilization by using polyproplyne fibers with
cement and noticed more strength values, added uniformity and intactness to the
stabilized peat itself. Tarmizi et. al (2014) are using the same method (air
curing technique) but added different type of filler which is mineral soil
filler (clay, silt, sand); mineral soil are easier, cheaper and more convenient
to use as fillers as they are readily available in situ/near the site. The
stabilized peat samples had been air-cured for 14 and 28 days respectively to
investigate the effect of time curing with their unconfined compressive
strength (UCS). 

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