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Lime Stabilization of Soil: A Physico-Chemical and Micro-Mechanistic Perspective
Lime stabilization is a well-established technique to improve the subgrade properties of different soil for pavement construction, despite construction difficulties and its ineffectiveness in certain conditions. However, a greater level of understanding is needed to know the mechanism of alteration in the properties of soils, particularly to longevity potential of ionic interaction. In the present study, mechanism of long-term strength behaviour of lime-treated soil has been brought clearly through alteration in ionic exchange (Ca2+, Mg2+, Na+ and K+), mineralogy and microstructure by performing series of physico-chemical and micro-analyses (XRD, SEM and EDAX). The results revealed that addition of lime to soil influences greatly the concentration of sodium (Na+) and calcium (Ca2+) ions with marginal alteration in potassium (K+) and magnesium (Mg2+) with curing periods. The variation in concentration of Ca2+ with curing periods has attributed to the strong cation exchange reactions at early stage and consumption of calcium in the formation of cementitious compounds with an increase in curing periods. However, concentration of Ca2+ increases after curing for longer periods, indicating the increase in solubility of cementitious compounds. Alterations in mineralogy and microstructure with an increase in curing periods of lime-treated soil substantiate the effect of changes in ionic concentration. Further, a significant increase in the strength up to 28 days and marginal up to 1 year substantiates that variation in Ca2+ and thereby, formation of cementitious compounds control the strength behaviour of lime-treated soil.
Lime Stabilization of Soil: A Physico-Chemical and Micro-Mechanistic Perspective
Lime stabilization is a well-established technique to improve the subgrade properties of different soil for pavement construction, despite construction difficulties and its ineffectiveness in certain conditions. However, a greater level of understanding is needed to know the mechanism of alteration in the properties of soils, particularly to longevity potential of ionic interaction. In the present study, mechanism of long-term strength behaviour of lime-treated soil has been brought clearly through alteration in ionic exchange (Ca2+, Mg2+, Na+ and K+), mineralogy and microstructure by performing series of physico-chemical and micro-analyses (XRD, SEM and EDAX). The results revealed that addition of lime to soil influences greatly the concentration of sodium (Na+) and calcium (Ca2+) ions with marginal alteration in potassium (K+) and magnesium (Mg2+) with curing periods. The variation in concentration of Ca2+ with curing periods has attributed to the strong cation exchange reactions at early stage and consumption of calcium in the formation of cementitious compounds with an increase in curing periods. However, concentration of Ca2+ increases after curing for longer periods, indicating the increase in solubility of cementitious compounds. Alterations in mineralogy and microstructure with an increase in curing periods of lime-treated soil substantiate the effect of changes in ionic concentration. Further, a significant increase in the strength up to 28 days and marginal up to 1 year substantiates that variation in Ca2+ and thereby, formation of cementitious compounds control the strength behaviour of lime-treated soil.
Lime Stabilization of Soil: A Physico-Chemical and Micro-Mechanistic Perspective
Indian Geotech J
Jha, Arvind Kumar (author) / Sivapullaiah, P. V. (author)
Indian Geotechnical Journal ; 50 ; 339-347
2020-06-01
9 pages
Article (Journal)
Electronic Resource
English
Lime Stabilization of Soil: A Physico-Chemical and Micro-Mechanistic Perspective
| Online Contents | 2019
Lime Stabilization of Soil: A Physico-Chemical and Micro-Mechanistic Perspective
| Springer Verlag | 2020
| TIBKAT | 1961
Soil pulverization and lime migration in soil-lime stabilization
| Engineering Index Backfile | 1965