Fine aggregate calculation

1.    Remove the fine aggregate from the pycnometer, dry to constant mass at a temperature of 110 ± 5°C, cool in air at room temperature for 1h and determine the mass.

Calculations:

Where:

A = mass of oven-dry sample in air (g)

B = mass of pycnometer filled with water (g)

C = mass of the pycnometer with specimen and water (g)

S= mass of SSD sample (g)

SSD Determination

1.      Hold mold firmly on bottom of pan with large diameter down. Fill the mold with the partially dried sample until it is overflowing.

2.      Then, lightly tamp the fine aggregate with the tamper. Hold the tamper about 5 mm above the sample and let it drop under the force of gravity up to 25 times.

3.      Remove loose sand from base and lift the mold vertically. If the surface moisture is still
present, the fine aggregate will retain the molded shape.

4.      If the fine aggregate retains the molded shape, continue to dry and repeat process.

For Moisture Content

1. First Acquire in-situ sample.

2. Then Weigh the sample, W in-situ condition.

3. Finally Dry the sample in oven for 24 hrs. and weigh the dried sample.

Moisture Content in % (Mc) =

Results:

Collected data:

Mass of aggregate from pile with tray: 556.8 g

Mass of SSD aggregate with tray: 562.0 g

Mass of tray: 213.0 g

Mass of OD aggregate with tray: 540.3 g

Mass of pycnometer filled with water only: 1237.3 g

Mass of pycnometer filled with water and aggregate: 1469.5 g

Specific Gravity and Absorption Capacity

A = mass of oven-dry sample in air (g)	327.3
B = mass of pycnometer filled with water (g)	1237.3
C = mass of the pycnometer with specimen and water (g)	1469.5
S = mass of SSD sample (g)	349

Moisture Content

Mass of pan (g)	213
Mass in-situ agg. + pan (g)	556.8
Mass oven-dry + pan (g)	540.3

Outcome

Bulk SG	2.80
SSD SG	2.98
Apparent SG	3.44
Abs. Capacity	6.63%
Moisture content	5%

Note: By hand calculations are attached in appendices section.

Conclusion:

Was the aggregate in the stockpile wetter or drier than the SSD condition?

Ans: The aggregate in the stockpile was drier than SSD condition as visible from Absorption (6.6%), MC(5%) and increase in Mass of SSD condition (SSD 349 g > stockpile 343.8 g), which means that the aggregate has absorbed significant amount of moisture.

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