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Author: search.filters.author.Arwaedo, NakibHas files: No

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    Effect of curing conditions on the strength of soil cement
    (2022-06-01)
    Chaiyaput, Salisa
    ;
    Arwaedo, Nakib
    ;
    Kingnoi, Namthip
    ;
    Nghia-Nguyen, Trong
    ;
    Ayawanna, Jiratchaya
    An experimental program was directed to the evaluation of the strength of soil (ball clay)-cement, and soil (soft clay)-cement samples with different curing conditions; tap water, lime-saturated water, plastic wrapping, and open ambient air at 28 days. The compression, and the scanning electron microscopy results were used to describe the effect of curing conditions on the compressive strength of soil-cement samples. The compressive strength of soil-cement samples was ~ 50% that of the plain cement sample. The compressive strength of the soft clay-cement samples was slightly higher than the ball clay-cement samples because of the coarse particles of soft clay containing a high amount of quartz, allowing the water to react with cement powder and increased the strength of soil-cement samples. The tendency of compressive strength development in the soil-cement samples was similar to that of the cement sample. The highest compressive strength was obtained for the lime-saturated water cured samples, suggesting a higher rate of hydration process by the protection of CaCO<inf>3</inf> leaching from cement in the lime water. Thus, the compressive strength in soil-cement samples was enhanced by the binding of cement hydration products between the adjacent soil particles.
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    Natural Para Rubber in Road Embankment Stabilization
    (2022-02-01)
    Chaiyaput, Salisa
    ;
    Arwaedo, Nakib
    ;
    Jamsawang, Pitthaya
    ;
    Ayawanna, Jiratchaya
    This is the first study on “ribbed smoked sheets (RSS)” as a geogrid reinforcement in geotechnical engineering. An RSS is a kind of natural para rubber. RSS (grade 3) was designed as a biaxial geogrid with an aperture size of 20 mm × 20 mm and a spacing of 20 mm. The RSS was found to be a significant functional layer when applied to the subbase lateritic soil layer. The lateritic soil with an RSS reinforcing layer was greatly improved regarding the California bearing ratio (CBR). Numerical simulation using two-dimensional finite element software was used to determine the optimal number and positions of the RSS reinforcing layers in road embankment stabilization. The simulation data in terms of horizontal displacement of unreinforced road embankments was validated by the collected data from the actual construction site. The RSS reinforced layer was varied from one to three layers under 61 analysis conditions. The highest safety factor was obtained with two layers of RSS at 0.1H below the top of the road embankment and 0.4H below the first RSS layer, suggesting a suitable installation of the RSS reinforcing layer. The RSS is thus strongly recommended as a reinforcing material in low CBR lateritic soil for the road embankment.