Abstract
The present study attempts to identify the potential of geopolymerization in developing a sustainable binding material using fly ash and flood soil waste as source material. The flood soil used in the study was collected from flood-affected areas of Kerala during the 2018 outburst. The dominance of silica in flood soil waste was revealed by microstructural characterization methods such as XRF, SEM, EDX, XRD, TGA and FTIR analysis. A set of 30 mix proportions were designed using the central composite design in design expert software to obtain the optimal mix. The parameters such as molarity of sodium hydroxide solution, sodium silicate to sodium hydroxide ratio (S/N), curing temperature and percentage of clay were analyzed statically using response surface methodology. A study was conducted regarding the influence of above parameters on properties such as compressive strength, dry density and water absorption. The outcome revealed that the compressive strength and dry density reached their maximum value and then decreased with an increase in molarity of sodium hydroxide solution and temperature of curing, while variations in water absorption followed a reverse trend. The optimum mix was at a molarity of 7 M, S/N ratio of 2 at 25 % flood soil waste and 75 °C of curing temperature. It was observed that treating flood soil waste with 4 % lime improved engineering properties in terms of compressive strength, split tensile strength and flexural strength. Again, the durability performances in terms of water absorption, sorptivity, impact resistance, abrasion resistance, drying shrinkage, acid attack resistance and sulfate attack resistance were also observed to be improved with the addition of lime. The improvement in engineering and durability performances after lime treatment of flood soil was attributed to the formation of C-S-H gel in the matrix which was discussed with the microstructural studies such as XRD and FTIR analysis.
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The authors wish to express their gratitude to the staffs and faculty members of NITC for the invaluable help and support extended in performing the experimental work.
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Lekshmi, S., Sudhakumar, J. Engineering and Durability Performances of Fly Ash Based Geopolymer Mortar Containing Aluminosilicate Rich Flood Soil Waste With and Without Lime Treatment. Silicon 14, 6141–6156 (2022). https://doi.org/10.1007/s12633-021-01391-y
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DOI: https://doi.org/10.1007/s12633-021-01391-y