Expansive soil poses a problem of volume change behaviour under changing moisture conditions. The volume change behaviour associated with swelling and shrinkage of the soil, is profoundly curtailed by chemical stabilization methods. Among the various stabilization methods, lime addition plays a predominant role and has been in practice for many decades successfully. The present study focuses on the curing dynamics of the lime stabilized soil. The strength gain with respect to lime addition is attributed to the cementitious reaction which progresses through time and the prevailing thermal conditions. In this study, the strength gain of lime amended soil in the time domain of 1–72 h was evaluated for two lime contents of 2 and 4% at 25 and 45 °C for two moisture conditions. Lime addition to soil typically changed the stress–strain behaviour of soil from ductile-strain hardening behaviour to a brittle-strain softening behaviour. However, the strength gain in 2% lime is lesser and comparable to strength of virgin soil. However, depicts a reasonable strength increase at 45 °C. Lime content of 4% depicts a profound strength increase with increase in temperature and moisture content as well. The stabilization mechanism is interpreted in the time–temperature domain for lime soil composites and dynamics of curing is established.

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Effect of Temperature and Water Content on the Curing Dynamics of Lime Treated Expansive Soil

  • Subramanian Bhuvaneshwari,
  • S. Dhivya

摘要

Expansive soil poses a problem of volume change behaviour under changing moisture conditions. The volume change behaviour associated with swelling and shrinkage of the soil, is profoundly curtailed by chemical stabilization methods. Among the various stabilization methods, lime addition plays a predominant role and has been in practice for many decades successfully. The present study focuses on the curing dynamics of the lime stabilized soil. The strength gain with respect to lime addition is attributed to the cementitious reaction which progresses through time and the prevailing thermal conditions. In this study, the strength gain of lime amended soil in the time domain of 1–72 h was evaluated for two lime contents of 2 and 4% at 25 and 45 °C for two moisture conditions. Lime addition to soil typically changed the stress–strain behaviour of soil from ductile-strain hardening behaviour to a brittle-strain softening behaviour. However, the strength gain in 2% lime is lesser and comparable to strength of virgin soil. However, depicts a reasonable strength increase at 45 °C. Lime content of 4% depicts a profound strength increase with increase in temperature and moisture content as well. The stabilization mechanism is interpreted in the time–temperature domain for lime soil composites and dynamics of curing is established.