Supakij Nontananandh

Bio: Supakij Nontananandh is an academic researcher from Kasetsart University. The author has contributed to research in topics: Cement & Portland cement. The author has an hindex of 5, co-authored 11 publications receiving 202 citations.

Combining Industrial Wastes with Lime for Soil Stabilization

Abstract: Using a geotechnical viewpoint, this paper proposes a potential, partial solution to solve some of the problems posed by increasing amounts of certain types of sludgy industrial waste. The primary objective of this study is to examine the potential for burning various industrial wastes combined with lime, in certain proportions, to produce a by-product having cementing characteristics similar to ordinary portland cement (OPC). It is found that the percentages of main cementitious compounds in this new cement-like stabilizer are comparable to those of OPC. The by-product also shows promise for use in stabilizing a loam soil. The contribution of ettringite to strength development is discussed. It is found that this new type of additive can be used to stabilize loam soil for subgrade purposes.

Effectiveness of Grass Strips as Barrier Against Runoff and Soil Loss in Jijiga Area, Northern Part of Somali Region, Ethiopia

Abstract: In this study, sixteen standard runoff plots with a dimension of 22.13 · 1.8 m each were constructed in a contour on a cultivated land with slope gradient of 9 % in Jijiga area of the northern part of Somali region of Ethiopia at the end of the year 2003. To evaluate the effectiveness of grass strips as barrier against the runoff and soil loss, an experiment was laid out in randomized complete block design with four treatments by four replicates on the constructed sixteen runoff plots. The treatments were one control-without grass strip and three different grass strips of 1 m wide each. The grass strips, namely desho, setaria and vetiver were established at a spacing of 15 cm within a row on the lower end runoff plots. All the runoff and soil loss from the treatments were measured during 38 storm events in the years 2004 and 2005. The depth of sediment deposition along the strips and the growth rate of strips were also measured. In both 2004 and 2005 study years, the three grass treatments showed significantly lower annual runoff and soil loss results compared to the control treatment. However, the lowest runoff and soil loss were recorded from the vetiver grass. This was because of its faster growth rate than both the desho and setaria grass strips. The depositions of sediment along the three grass strip treatments were significantly higher than that of the control section, suggesting that three grass strips had the potential to cause terracing. However, the preference should be for the vetiver grass because it formed terraces much quicker than both the desho and setaria grass strips. In general, even though the three grasses could be used as barrier against runoff and soil loss, and had potential to cause terrace formation on gentle slope, it was however recommended that they should be rated as: vetiver>desho>setaria in accordance with their relative effectiveness.

Reutilization of waste concrete powder by cement hardening.

Abstract: The reuse or recycle of waste materials is one of the most important problems in developed countries.The study is focused on the reutilization of the waste concrete powder, which is a by-product of recycling the waste concrete. This concrete powder is producted (about 30% in weight of original waste concrete) when the waste concrete is crushed and the aggregates are sieved away. The objective of this research is to clarify the possibility of the practical use of the cement hardened concrete powder. The treated samples were subjected to the following tests; an unconfined compression test, an X-ray diffraction analysis, a scanning electron microscope observation, etc.As the result, a large hardening effect was noticed when a small amount of the carbonated aluminated salt material is added to the cement, compared with the case of only cement mixing. The strength change during the subsequent hydration is then discussed. According to this procedure, the stabilized waste concrete powder can be applied as a soil stabilizer and/or a grout material.

Remediation of Heavy Metals Polluted Soil Using Metal Insolubilizing Materials

Abstract: Heavy metal ions, one kind of harmful substance, may exist in the soil irrelevant to artificial development, and soil contamination, due to soil and rock containing these naturally derived heavy metals, has recently become apparent. Thus, in an amendment that came into effect in 2010 of Japan, the scope of countermeasures and regulations for contaminated soil was amended to “contaminated soil derived from artificial development” and “naturally derived contaminated soil”. When naturally derived contaminated soil is encountered during the carrying out of construction work, countermeasures against this type of soil contamination are necessary. In this research, new metal-insolubilizing materials are developed in order to improve the insolubilization treatment which is one method for treating contaminated soil. Specifically, tests are conducted to clarify the insolubilization effect on heavy metals, and the insolubilization mechanism is chemically and mineralogically discussed.

Properties Of Concrete

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Influence of Fly Ash, Lime, and Polyester Fibers on Compaction and Strength Properties of Expansive Soil

Abstract: An experimental program was undertaken to study the effects of polyester fiber inclusions and lime stabilization on the geotechnical characteristics of fly ash-soil mixtures. An Indian fly ash was mixed with expansive soil in different proportions. The geotechnical characteristics of fly ash-soil specimens, lime-soil specimens and lime-fly ash-soil specimens mixed with different proportions of randomly oriented fibers were investigated. Lime and fly ash were added to an expansive soil at ranges of 1–10% and 1–20%, respectively. Test specimens were subjected to compaction tests, unconfined compression tests and split tensile strength tests. Specimens were cured for 7, 14, and 28 days after which they were tested for unconfined compression tests and split tensile tests. Based on optimum values obtained for lime and fly ash, tests were conducted on test specimens prepared from fly ash-expansive soil- lime-fiber mixture after 28 days of curing. Samples were tested with 0, 0.5, 1.0, 1.5, and 2% plain and crimped polyester fibers by dry weight. Based on the favorable results obtained, it can be concluded that the expansive soil can be successfully stabilized by the combined action of fibers, lime, and fly ash.