METHOD AND INSTRUMENT FOR MEASURING SPECIFIC GRAVITY IN SATURATED SURFACE-DRY CONDITION OF SAND

摘要

PURPOSE: To measure the specific gravity in saturated surface-dry condition of wet sand without setting the sand in a saturated surface-dry state by finding the weight of a prescribed volume of a mixture of sand and water, weight of water in terms of an aqueous solution having a different specific gravity, and specific gravity of the aqueous solution separated from the mixture. ;CONSTITUTION: After sand is put in a container 1 and water is poured in the container 1 until the surface level of the water reaches a mark 3, the content of the container 1 is agitated and a sucking device 7 is operated to such the water through a nozzle 8 until the surface level of the water reaches a level 1A and the mixture of sand and water becomes a prescribed volume L₁. The weight WS of the volume L₁ of the mixture is found by subtracting the weight F₁ of the container 1 from the gross weight W₁ of the container 1 containing the sand and water. Then the temperature T_1w of the water is measured and the specific gravity ρ_w of the water is found on the temperature T_1w. Thereafter, the water is discharged from the container 1 and a prescribed aqueous solution (e.g. a potassium carbonate solution having a specific gravity of about 1.5) is poured in the container 1 and agitated. After agitation, the weight WE of the aqueous solution and sand is found similarly to the water and a prescribed volume L₂ of the solution is transferred to another container. Then the weight W₂H of the transferred solution is measured and the specific gravity ρE of the solution is found from the volume L₂ and weight W₂H. Finally, the specific gravity ρ of the sand in saturated surface-dry state is obtained by performing calculation on each measured value.;COPYRIGHT: (C)1996,JPO