Delineating the Aptness of Improved Geomaterial Strength for Ground Improvement Through Microstructure and Cluster Analysis
By: Nwonu, Chimobi Donald
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Contributor(s): Mama, Cordelia Nnennaya.
Publisher: switzerland Springer 2021Edition: Vol,51(6),December.Description: 1151-1165p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian geotechnical journalSummary: sustainable technology using geopolymer synthesised from industrial waste materials was adopted to treat black clay soil for use in a geotechnical application such as in slope stability. A robust experimental design was applied, considering precursor type, precursor percentage (Pc), liquid activator type (LT), activator-to-precursor ratio and method of preparation (M) as the process factors for the unconfined compressive strength (UCS) determination. The results obtained following Taguchi optimisation and ANOVA revealed the most crucial factors to be LT, Pc and M. Optimum increment in UCS of about four times was achieved and validated using confirmatory experiment at 90% confidence level. An R2 value of 0.937 obtained between the experimental and predicted UCS underlines the prediction accuracy. The predicted values of the full factorial space for the developed soil geopolymers were used to classify them for reliability in a geotechnical application using minimum strength of 200 kPa, via hierarchical cluster analysis (HCA). A novel Taguchi hierarchical cluster standardisation procedure was implemented to execute the HCA, integrating geopolymer factors and their levels. The approach was found to be efficient in grouping the data by achieving high similarity levels in the resulting clusters. Moreover, HCA delineated the aptness level of the developed soil geopolymers and complemented/validated the ANOVA and Taguchi optimisation result of factor effects. The microlevel changes in the geopolymer-treated soil were delineated through mineralogical identification, morphological and elemental analyses. The geopolymer soil treatment is superior to lime treatment based on the outcome of the microlevel analyses.
| Item type | Current location | Call number | Status | Date due | Barcode | Item holds |
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Articles Abstract Database
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2021-2022654 |
sustainable technology using geopolymer synthesised from industrial waste materials was adopted to treat black clay soil for use in a geotechnical application such as in slope stability. A robust experimental design was applied, considering precursor type, precursor percentage (Pc), liquid activator type (LT), activator-to-precursor ratio and method of preparation (M) as the process factors for the unconfined compressive strength (UCS) determination. The results obtained following Taguchi optimisation and ANOVA revealed the most crucial factors to be LT, Pc and M. Optimum increment in UCS of about four times was achieved and validated using confirmatory experiment at 90% confidence level. An R2 value of 0.937 obtained between the experimental and predicted UCS underlines the prediction accuracy. The predicted values of the full factorial space for the developed soil geopolymers were used to classify them for reliability in a geotechnical application using minimum strength of 200 kPa, via hierarchical cluster analysis (HCA). A novel Taguchi hierarchical cluster standardisation procedure was implemented to execute the HCA, integrating geopolymer factors and their levels. The approach was found to be efficient in grouping the data by achieving high similarity levels in the resulting clusters. Moreover, HCA delineated the aptness level of the developed soil geopolymers and complemented/validated the ANOVA and Taguchi optimisation result of factor effects. The microlevel changes in the geopolymer-treated soil were delineated through mineralogical identification, morphological and elemental analyses. The geopolymer soil treatment is superior to lime treatment based on the outcome of the microlevel analyses.
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