The degree of saturation determination method.

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The degree of saturation determination method.

The degree of saturation measures how much water is in the void spaces of a sample relative to the size of those voids. The SSD (saturated surface dry) method uses a two-step weight approach to link the water filling the pores to the pore volume. First you determine how much void space there is by drying the sample to oven-dry and calculating the air-void volume. Then you saturate the sample to SSD and weigh it again; the increase in mass from oven-dry to SSD corresponds to the water that has filled the voids (the water in the pores, with a thin surface film). By comparing that water mass (converted to a water volume) to the known volume of air in the specimen, you obtain the saturation percentage. This direct link between the amount of water gained and the pore volume is why this method is the best fit for determining degree of saturation. Reason the other options don’t fit as well: simply tracking the increase in mass of dry components doesn’t relate to the pore volume, so it won’t give saturation. Using volume displacement isn’t the standard approach for calculating saturation in this context, and estimating saturation from room humidity won’t reflect the actual water content inside the voids.

The degree of saturation measures how much water is in the void spaces of a sample relative to the size of those voids. The SSD (saturated surface dry) method uses a two-step weight approach to link the water filling the pores to the pore volume. First you determine how much void space there is by drying the sample to oven-dry and calculating the air-void volume. Then you saturate the sample to SSD and weigh it again; the increase in mass from oven-dry to SSD corresponds to the water that has filled the voids (the water in the pores, with a thin surface film). By comparing that water mass (converted to a water volume) to the known volume of air in the specimen, you obtain the saturation percentage. This direct link between the amount of water gained and the pore volume is why this method is the best fit for determining degree of saturation.

Reason the other options don’t fit as well: simply tracking the increase in mass of dry components doesn’t relate to the pore volume, so it won’t give saturation. Using volume displacement isn’t the standard approach for calculating saturation in this context, and estimating saturation from room humidity won’t reflect the actual water content inside the voids.

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