Influence of Soluble Sodium Sulphate Contamination on Physical and Strength Behavior of Untreated and Lime Treated Soil
KSCE Journal of Civil Engineering(2022)
摘要
The susceptible behavior of sulphatic soil with lime treatment is explored mostly by using gypsum. However, the effect of varying sulphate cations contamination in the behavior of chemically treated soils with calcium based stabilizers has not been given attention properly. Hence, the present study explores the influence of soluble monovalent sodium sulphate (Na 2 SO 4 ) on the physical and strength behavior of untreated and treated expansive soil with lime. Further, research works are extended to establish the soluble Na 2 SO 4 concentration that can affect adversely to the lime treatment in comparison to untreated soil and its mechanism is elucidated using detailed physicochemical and microanalyses. The results reveal that the soluble Na 2 SO 4 contamination of both untreated and lime treated soil has shown an increase in the MDD and reduction in OWC with a marginal effect on the plasticity characteristics. The soluble Na 2 SO 4 contamination accelerates the early strength in the treated soil as compared to the same with untreated soil. On the contrary, longer curing periods and higher sulphate concentrations beyond 20,000 ppm lead to distress in the strength of untreated and treated soil. Multiple factors that can control the behavior of both untreated and treated soil upon soluble Na 2 SO 4 concentration such as cation position in lyotropic series, ionic reactions and its products are evidenced using the microanalyses (SEM, XRD, EDAX, TGA, FTIR) and physicochemical changes (pH and EC).
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关键词
Ettringite,Lime,Microanalysis,Na2SO4,Physicochemical,Strength
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