What is the minimum size required for an SFRM density test sample?

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Multiple Choice

What is the minimum size required for an SFRM density test sample?

Explanation:
Density testing of SFRM relies on a small, well-defined piece of material that is large enough to average out local density variations but small enough to be practical to obtain in the field. Eight cubic inches provides that balance. A sample of this volume can be a 2-inch cube, giving a known volume you can dry and weigh reliably. After drying to constant mass, you weigh the sample and divide the mass by the known volume to get density, converting to pounds per cubic foot (multiply by 1728 to go from cubic inches to cubic feet). For example, a dried mass of 0.15 lb in an 8 in^3 sample gives about 32 pcf. Smaller samples would lead to greater variability from uneven compaction or moisture, while larger samples don’t significantly improve accuracy and are harder to handle in the field. So the minimum size used for the SFRM density test sample is eight cubic inches.

Density testing of SFRM relies on a small, well-defined piece of material that is large enough to average out local density variations but small enough to be practical to obtain in the field. Eight cubic inches provides that balance. A sample of this volume can be a 2-inch cube, giving a known volume you can dry and weigh reliably. After drying to constant mass, you weigh the sample and divide the mass by the known volume to get density, converting to pounds per cubic foot (multiply by 1728 to go from cubic inches to cubic feet). For example, a dried mass of 0.15 lb in an 8 in^3 sample gives about 32 pcf. Smaller samples would lead to greater variability from uneven compaction or moisture, while larger samples don’t significantly improve accuracy and are harder to handle in the field. So the minimum size used for the SFRM density test sample is eight cubic inches.

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