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Statistical Assessment of Liquid Limit of Pond Ash-Based Processed Geomaterial
The liquid limit test is an index-based test to infer the engineering behaviour of geomaterials used for landfill liner applications. As part of the experimental programme, two pond ash samples were collected from Neyveli Thermal Power Station (NTPS) ash dyke in different locations and intervals of time. The Pond Ash I (PA-I) and Pond Ash-II (PA-II) are classified as silty sand (SM), comprising 14% fines and 26% fines, respectively. Further, experiments were conducted by adding different proportions of bentonite (10%/20%/30%) to the PA-I and PA-II, respectively. The partial inclusion of bentonite (B) in the pond ash sample increased the liquid limit of the processed geomaterials. However, the liquid limit value differs for the respective PA-I and PA-II for the same inclusion rate of bentonite. Hence, to understand these differences, additional statistical studies were carried out to address whether the changes are attributed to differences in gradation or uncertainties (commonly addressed through the Coefficient of Variation (COV)) associated with the test results. The initial observation indicated that the inherent variability of the pond ash is less compared with natural geomaterials. Further, based on the test results, a hypothesis was tested using two-sample independent t-test statistics. It is observed that the test statistics of both PA-I and PA-II-based liquid limit values are lesser than the critical t-value values at a 5% significance level, indicating that the deviation is insignificant. On comparing the liquid limits of respective bentonite blended PA-I and PA-II samples, it is observed that the differences in gradation (fines content of 12%) between the two pond ashes do not influence the liquid limit values for the 5% significance level. The analysis of variance (ANOVA) statistics also infers a similar observation.
Statistical Assessment of Liquid Limit of Pond Ash-Based Processed Geomaterial
The liquid limit test is an index-based test to infer the engineering behaviour of geomaterials used for landfill liner applications. As part of the experimental programme, two pond ash samples were collected from Neyveli Thermal Power Station (NTPS) ash dyke in different locations and intervals of time. The Pond Ash I (PA-I) and Pond Ash-II (PA-II) are classified as silty sand (SM), comprising 14% fines and 26% fines, respectively. Further, experiments were conducted by adding different proportions of bentonite (10%/20%/30%) to the PA-I and PA-II, respectively. The partial inclusion of bentonite (B) in the pond ash sample increased the liquid limit of the processed geomaterials. However, the liquid limit value differs for the respective PA-I and PA-II for the same inclusion rate of bentonite. Hence, to understand these differences, additional statistical studies were carried out to address whether the changes are attributed to differences in gradation or uncertainties (commonly addressed through the Coefficient of Variation (COV)) associated with the test results. The initial observation indicated that the inherent variability of the pond ash is less compared with natural geomaterials. Further, based on the test results, a hypothesis was tested using two-sample independent t-test statistics. It is observed that the test statistics of both PA-I and PA-II-based liquid limit values are lesser than the critical t-value values at a 5% significance level, indicating that the deviation is insignificant. On comparing the liquid limits of respective bentonite blended PA-I and PA-II samples, it is observed that the differences in gradation (fines content of 12%) between the two pond ashes do not influence the liquid limit values for the 5% significance level. The analysis of variance (ANOVA) statistics also infers a similar observation.
Statistical Assessment of Liquid Limit of Pond Ash-Based Processed Geomaterial
Lecture Notes in Civil Engineering
Verma, Amit Kumar (editor) / Singh, T. N. (editor) / Mohamad, Edy Tonnizam (editor) / Mishra, A. K. (editor) / Gamage, Ranjith Pathegama (editor) / Bhatawdekar, Ramesh (editor) / Wilkinson, Stephen (editor) / Sankar Ganesh, K. S. (author) / Ashok Kumar, T. (author)
International Conference on Geotechnical Issues in Energy, Infrastructure and Disaster Management ; 2024 ; Patna, India
2024-12-01
9 pages
Article/Chapter (Book)
Electronic Resource
English
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