Unformatted text preview: The measurement should be taken to the 0.5 g. 7. The aggregates then must be weighed in water. Let the aggregates soak for about 3 minutes in the bulk station. Take this weight. 8. Dry the test sample for 1 to 3 hours in an oven. Remove, let cool, and weigh again. In this lab, we will let the aggregate dry over night. Calculations • Bulk Specific Gravity ) ( submerged air dry oven sb SSD SSD Mass G-=-• Bulk Specific Gravity (SSD) ) ( submerged air air ssd SSD SSD SSD G-= • Apparent Specific Gravity ) ( submerged dry oven dry oven sa SSD Mass Mass G-=--• Absorption 100 * ] [ % ovendry ovendry air Mass Mass SSD Abs-= Significance and Use • Bulk specific gravity is vital for volumetric calculations. • Apparent specific gravity relates to the density of the solid. It excludes the pore space of the aggregate....
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- Spring '09
- 3 hours, 0.5 g, 3 minutes, 24 hrs