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Impact of Nano-Silica and Cement on Geotechnical Properties of Bentonite Soil
https://orcid.org/http://orcid.org/0000-0003-0032-3478
This paper examines the effect of nano-silica and cement on the geotechnical properties of bentonite, both individually and in combination. For this objective, the nano-silica and cement contents were adjusted from 0.2 to 1% and from 4 to 8% by dry weight of bentonite, respectively. This investigation revealed that the plasticity index reduced from 243.82 to 215.19% and then from 243.82 to 201%, equivalent to a nano-silica and cement content of 0.8% and 8%, respectively. The mixture containing 8% cement and 0.8% nano-silica in bentonite had the lowest plasticity. Raising the amount of nano-silica, cement, or their combination in bentonite enhanced both the optimum moisture content and the dry unit weight. The compressive, tensile and CBR strengths of bentonite were improved after addition of nano-silica, whereas further enhancement was noticed after additional mixing of cement. The maximum axial stress, tensile stress and bearing ratio were measured in 0.8NS8C mix after 28 days. After 28 days of curing, the axial stress of mix 0.8NS4C was 1.44, 1.22 and 1.09 times, whereas tensile stress for the same was 1.24, 1.12 and 1.04 times greater than 4C, 6C and 8C, respectively. The CBR % in 0.8NS8C mix observed increment from 27.11 to 60.9% and 22.5% to 44.51% in un-soaked and soaked condition, respectively, after 28 days. The improved strength properties were attributed to the advance bonding characteristics due to formation of pozzolanic products (calcium silicate hydrate) after curing. SEM images of treated bentonite reveal denser and stiffer matrix with detection of newly formed pozzolanic products (calcium silicate hydrate gel). FTIR spectrum also reveals formation of new chemical compounds after ion exchange process indicated with broader band width in the region of wavenumber between 600 and 1500 cm−1 as noticed in 0.8NS and 0.8NS8C mixes.
Impact of Nano-Silica and Cement on Geotechnical Properties of Bentonite Soil
https://orcid.org/http://orcid.org/0000-0003-0032-3478
This paper examines the effect of nano-silica and cement on the geotechnical properties of bentonite, both individually and in combination. For this objective, the nano-silica and cement contents were adjusted from 0.2 to 1% and from 4 to 8% by dry weight of bentonite, respectively. This investigation revealed that the plasticity index reduced from 243.82 to 215.19% and then from 243.82 to 201%, equivalent to a nano-silica and cement content of 0.8% and 8%, respectively. The mixture containing 8% cement and 0.8% nano-silica in bentonite had the lowest plasticity. Raising the amount of nano-silica, cement, or their combination in bentonite enhanced both the optimum moisture content and the dry unit weight. The compressive, tensile and CBR strengths of bentonite were improved after addition of nano-silica, whereas further enhancement was noticed after additional mixing of cement. The maximum axial stress, tensile stress and bearing ratio were measured in 0.8NS8C mix after 28 days. After 28 days of curing, the axial stress of mix 0.8NS4C was 1.44, 1.22 and 1.09 times, whereas tensile stress for the same was 1.24, 1.12 and 1.04 times greater than 4C, 6C and 8C, respectively. The CBR % in 0.8NS8C mix observed increment from 27.11 to 60.9% and 22.5% to 44.51% in un-soaked and soaked condition, respectively, after 28 days. The improved strength properties were attributed to the advance bonding characteristics due to formation of pozzolanic products (calcium silicate hydrate) after curing. SEM images of treated bentonite reveal denser and stiffer matrix with detection of newly formed pozzolanic products (calcium silicate hydrate gel). FTIR spectrum also reveals formation of new chemical compounds after ion exchange process indicated with broader band width in the region of wavenumber between 600 and 1500 cm−1 as noticed in 0.8NS and 0.8NS8C mixes.
Impact of Nano-Silica and Cement on Geotechnical Properties of Bentonite Soil
https://orcid.org/http://orcid.org/0000-0003-0032-3478
This paper examines the effect of nano-silica and cement on the geotechnical properties of bentonite, both individually and in combination. For this objective, the nano-silica and cement contents were adjusted from 0.2 to 1% and from 4 to 8% by dry weight of bentonite, respectively. This investigation revealed that the plasticity index reduced from 243.82 to 215.19% and then from 243.82 to 201%, equivalent to a nano-silica and cement content of 0.8% and 8%, respectively. The mixture containing 8% cement and 0.8% nano-silica in bentonite had the lowest plasticity. Raising the amount of nano-silica, cement, or their combination in bentonite enhanced both the optimum moisture content and the dry unit weight. The compressive, tensile and CBR strengths of bentonite were improved after addition of nano-silica, whereas further enhancement was noticed after additional mixing of cement. The maximum axial stress, tensile stress and bearing ratio were measured in 0.8NS8C mix after 28 days. After 28 days of curing, the axial stress of mix 0.8NS4C was 1.44, 1.22 and 1.09 times, whereas tensile stress for the same was 1.24, 1.12 and 1.04 times greater than 4C, 6C and 8C, respectively. The CBR % in 0.8NS8C mix observed increment from 27.11 to 60.9% and 22.5% to 44.51% in un-soaked and soaked condition, respectively, after 28 days. The improved strength properties were attributed to the advance bonding characteristics due to formation of pozzolanic products (calcium silicate hydrate) after curing. SEM images of treated bentonite reveal denser and stiffer matrix with detection of newly formed pozzolanic products (calcium silicate hydrate gel). FTIR spectrum also reveals formation of new chemical compounds after ion exchange process indicated with broader band width in the region of wavenumber between 600 and 1500 cm−1 as noticed in 0.8NS and 0.8NS8C mixes.
Impact of Nano-Silica and Cement on Geotechnical Properties of Bentonite Soil
Indian Geotech J
Chaudhary, Vaibhav (author) / Yadav, Jitendra Singh (author) / Dutta, Rakesh Kumar (author)
Indian Geotechnical Journal ; 54 ; 1420-1437
2024-08-01
18 pages
Article (Journal)
Electronic Resource
English
Impact of Nano-Silica and Cement on Geotechnical Properties of Bentonite Soil
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