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Geotechnical investigation of low-plasticity organic soil treated with nano-calcium carbonate

Journal of Rock Mechanics and Geotechnical Engineering 2023年第2期15卷 500-509页

作者： Govindarajan Kannan Brendan C.O’Kelly Evangelin Ramani Sujatha Centre for Advanced Research in Environment School of Civil EngineeringSASTRA Deemed to be UniversityThanjavurTamil Nadu613401India Department of Civil Structural and Environmental EngineeringTrinity College DublinDublinD02 PN40Ireland

Soil stabilization using nanomaterials is an emerging research area although,to date,its investigation has mostly been laboratory-based and therefore requires extensive study for transfer to practical field *** present study advocates nano-calcium carbonate(NCC)material,a relatively unexplored nanomaterial additive,for stabilization of low-plasticity fine-grained soil having moderate organic *** plasticity index,compaction,unconfined compressive strength(UCS),compressibility and permeability characteristics of the 0.2%,0.4%,0.6%and 0.8%NCC-treated soil,and untreated soil(as control),were determined,including investigations of the effect of up to 90-d curing on the UCS and permeability *** terms of UCS improvement,0.4%NCC addition was identified as the optimum dosage,mobilizing a UCS at 90-d curing of almost twice that for the untreated *** treated soil,particle aggregation arising from NCC addition initially produced an increase in the permeability coef-ficient,but its magnitude decreased for increased curing owing to calcium silicate hydrate(CSH)gel formation,although still remaining higher compared to the untreated soil for all dosages and curing periods *** index decreased for all NCC-treated soil *** micro-graphs indicated the presence of gel patches along with particle aggregation.X-ray diffraction(XRD)results showed the presence of hydration products,such as *** increases in UCS are initially attributed to void filling and then because of CSH gel formation with increased curing.

关键词： organic silt Calcium carbonate Nano-calcium carbonate(NCC) Calcium silicate hydrate(CSH) Soil stabilization

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