Controlling suction by vapour equilibrium technique at different temperatures, application to the determination of the water retention properties of MX80 clay

TL;DR

This study presents a vapour equilibrium method to control soil suction at various temperatures, calibrates saline solutions for temperature effects, and examines how water retention curves of MX80 clay shift with temperature changes.

Contribution

It introduces a method to control soil suction at different temperatures and assesses the thermal effects on water retention properties of MX80 clay.

Findings

Water retention curves shift downward with increasing temperature.

Calibration of saline solutions matches literature data.

Thermal effects significantly influence soil water retention.

Abstract

Problems related to unsaturated soils are frequently encountered in geotechnical or environmental engineering works. In most cases, for the purpose of simplicity, the problems are studied by considering the suction effects on volume change or shear strength under isothermal conditions. Under isothermal condition, very often, a temperature independent water retention curve is considered in the analysis, which is obviously a simplification. When the temperature changes are too significant to be neglected, it is necessary to account for the thermal effects. In this paper, a method for controlling suction using the vapour equilibrium technique at different temperatures is presented. First, calibration of various saturated saline solutions was carried out from temperature of 20 degrees C to 60 degrees C. A mirror psychrometer was used for the measurement of relative humidity generated by saturated saline solutions at different temperatures. The results obtained are in good agreement with the data from the literature. This information was then used to determine the water retention properties of MX80 clay, which showed that the retention curve is shifting down with increasing of temperature.