EXPERIMENT 3SPECIFIC GRAVITY AND ABSORPTION OF COARSE AGGREGATEPURPOSE: To determine the bulk specific gravity (bulk and apparent) and absorption capacity of coarse aggregate (AGG-5)RELATED STANDARDS: ASTM C127DEFINITIONS: Specific Gravity is the ratio of weight in air of a unit volume of a material to the weight of an equal volume of water Bulk specific gravity is the ratio of the weight in air of unit vol of aggregate to the weight of an equal volume of water. Apparent specific gravity is the ratio of the weight in air of unit volume of the impermeable portion of aggregate to the weight of an equal volume of water. Absorption is the increase in weight of aggregate due to water in the pores, but not including water adhering to the outside surface of the particles, expressed as a percentage of the dry weight.EQUIPMENTS:Balance, wire basket (3.35 mm or finer wire mesh), water tank, oven.SAMPLE:A minimum of 4000 gm(8.8 lb)PROCEDURE:1. Weigh the test sample: A (g).2. Immerse the aggregate in water at room temperature for a period of 24 4 h.3. Remove the sample from the water. Rol it in a large absorbent cloth until all visible films of water are removed. The sample is now in saturate surface dry condition.4. Weigh the SSD sample: B (g).5. Place SSD sample in the wire basket and det. Its weight in water C (g). Note that the wire basket should be immersed to a depth sufficient to cover it and the test sample during weighing.6. Remove the sample from the wire basket.7. Dry the sample to constant weight at a temperature of 110 5 C and weigh: D (g).8. Calculate the specific gravity and absorption.

Bulk specific gravity, dry =

Bulk specific gravity, SSD =

Apparent specific gravity =

Absorption = x 100

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