Total views : 249
Utilisation of Phosphogypusm and Flyash in Soil Stabilisation
Background/Objectives: Buildable land with good natural bearing capacity is reducing and it leads to the construction of buildings on poor soils which are finally leads to structural foundation failures. This necessitated the use of available admixtures for the improvement of soil characteristics economically. Among the available resources, industrial by- products can be effectively used as admixtures since it can solve the hazardous problems due to its disposal. Methods: Grain size analysis and Atterberg’s limits tests are conducted to classify the soils used in this study. To evaluate the effect of admixtures, strengths characteristics of soils were observed by Unconfined Compressive Strength and California Bearing Ratio tests. Weak soils having high expansive characteristics are used to study the activation of 5% fly ash blended with Phospho Gypsum (PG) at varying percentages of 2%, 4% and 6% with two weak soils at different curing conditions. Findings: Results shows higher strength development upto a percentage of 4% PG with 5% flyash with both the soils. Effect of curing periods on strength characteristics of treated soils at 7, 28 and 60 days were also considered in this study. Microstructural studies are also showing an improvement in microstructure which is examined in SEM micrographs and XRD results. The influence of flyash with different percentages of phosphogypsum on swelling characteristics shows a decrease in swell potential of treated soil with increase in curing periods. Improvement: This study gives an effective application of Phospho Gypsum and Fly Ash in geotechnical field by using it as a relevant soil stabilizer. Increase in CBR values were obtained with Fly Ash and Phospho Gypsum combinations with soils, which reduces the thickness of pavement and making more productive use of industrial wastes with considerable environmental benefits.
Compressive Strength, Fly Ash, Phosphogypusm, Stabiisation
- Kolias S, Rigopoulou VK, Karahalios A. Stabilisation of clayey soils with high calcium fly ash and cement. Cement and Concrete Composites. 2005;27(2):301–13.
- Ogundipe, Moses O. An investigation into the use of limestabilized clay as subgrade material. International Journal of Scientific and Technology Research. 2013; 2(10):82–6.
- Nalbantoglu Z. Effectiveness of class C fly ash as an expansive soil stabilizer. Construction and Building Materials. 2004; 18(6):377–81.
- Moses G, Osinubi KJ. Influence of compactive efforts on cement- bagasse ash treatment of expansive black cotton soil. World Academy of Science, Engineering and Technology. 2013; 1541–8.
- Al-Zoubi MS. Undrained shear strength and swelling characteristics of cement treated soil. Jordan Journal of Civil Engineering. 2008; 2(1):53–62.
- Fattah MY, Rahil FH, Al-Soudany KYH. Improvement of clayey soil characteristics using rice husk ash. Journal of Civil Engineering and Urbanism. 2013; 3(1):12–8.
- IS: 2720 (Part 1), Methods of test for soil: Preparation of dry soil sample for various tests. New Delhi: Bureau of Indian Standards; 1983.
- IS: 2720 (Part 40), Methods of tests for soil: Determination of free swell index of soil. New Delhi: Bureau of Indian Standards; 2002.
- IS: 1498, Classification and identification of soils for general engineering purposes. New Delhi: Bureau of Indian Standards; 1970. p. 1–28.
- IS: 2720 (Part 3), Methods of tests for soil, Determination of specific gravity. New Delhi: Bureau of Indian Standards; 1987.
- IS: 2720 (Part 5), Methods of tests for soil: Determination of liquid limit and plastic limit. New Delhi: Bureau of Indian Standards; 1985.
- IS: 2720 (Part 6), Methods of tests for soil: Determination of shrinkage factors. New Delhi: Bureau of Indian Standards; 1972.
- IS: 2720 (Part 10), Methods of tests for soil: Determination of unconfined compressive strength. New Delhi: Bureau of Indian Standards; 1973.
- .IS: 2720 (Part 7), Methods of tests for soil: Determination of water content-dry density relation using light compaction. New Delhi: Bureau of Indian Standards; 1987.
- IS: 2720 (Part 16), Methods of tests for soil: Laboratory determination of CBR. New Delhi: Bureau of Indian Standards; 1987.
- There are currently no refbacks.
This work is licensed under a Creative Commons Attribution 3.0 License.