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Properties of Stabilized Peat by Soil-Cement Column ... - Ejge.com

Properties of Stabilized Peat by Soil-Cement Column ... - Ejge.com

Shear stress (Kpa)

Shear stress (Kpa) Unconfined Compressive strength (kpa) Vol. 13, Bund. J 6 Effect on unconfined compressive strength Form UCT test in laboratory with the sample collected from stabilised column after 14 days of stabilisation, it was observed that unconfined compressive strength increased than original soil . Although this result does not reflect the actual field condition, as it is difficult to collect undisturbed sample, this is a clear indication of improvement. Wong et al. (2008), Huat et al. (2005) and Deboucha et al. (2008) have found higher value of unconfined strength in their respective study because they have implemented every step of experiment in laboratory. Fig. 2 shows UCT result. 20 15 10 5 0 0 2 4 6 8 10 Strain % Cement + CaCl2 + Sand Cement + Bentonite + Sand, Premixed" Figure 2: Unconfined compressive strength of collected sample from stabilised column. Effect on shear strength From direct shear box test it was observed that the shear strength has reached upto 100 Kpa for 20 kg normal stress and for the sample tested after 14 days of stabilisation. This indicates that shear strength of peat soil significantly improve after stabilisation. Fig. 3 shows the direct shear box test result. 120.00 100.00 80.00 60.00 40.00 20.00 0.00 0.00 1.00 2.00 3.00 4.00 5.00 6.00 Shear displacement (mm) 10 Kg 20 kg 5 kg Figure 3: Shear stress of stabilised peat for different normal load condition from direct shear box test

Vol. 13, Bund. J 7 SEM and EDX test The effect of stabilization on peat soil column’s structure has been observed by Scanning Electron Micrograph (SEM) and Energy Dispersive X-Ray (EDX) test as Figs. 4 and 5. These figures explain that the new structure’s soil has been appeared in stabilised soil column. SEM shows that peat soil become very compact condition after stabilisation. The presence of carbon at peak implies that pozzolanic reaction is taking reaction is taking to form a cementitious material. (a) (b) Figure 4: Scanning electron micrograph of a) original peat soil b) stabilized peat Figure 5: EDX micrograph of a) Original peat b) stabilised peat

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