CONTRIBUTION OF LIQUID ASPHALT IN SHEAR STRENGTH AND REBOUND CONSOLIDATION BEHAVIOUR OF GYPSEOUS SOIL

Abstract

AbstractThis paper deals with the effect of stabilizing gypseous soil using two liquid Asphalttypes (cutback and emulsion) on its behavior in shear strength and reboundconsolidation.Soil-Asphalt specimens had been constructed using various percentages of both liquidAsphalt types. One group of such specimens were tested in the direct shear boxapparatus to determine the effect of liquid Asphalt on shear strength, cohesion andangle of internal friction using the unconsolidated un drained test.Another group of the specimens were subjected to one dimensional confinedcompression test using both dry and saturated testing conditions in the consolidationapparatus.The effect of liquid Asphalt on the behavior of mixes in consolidation and reboundconsolidation was studied.It was concluded that gypseous soil is usually stiff in the dry condition, but it is weakand had a collapsible behavior when saturated. The addition of liquid Asphalt providescohesion strength to the soil mass and also acts as a waterproof agent. It creates a typeof elastic properties and reduces the total strain.

Keywords

• consolidation
• cutback
• emulsion
• gypseous soil
• shear strength