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To characterize the strength behaviour of
stabilized peat, 6 units of specimens of different curing duration; 14 and 28
days had been 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 required
quantities 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 internal 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 each ends preserve 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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