Sieve Analysis Specific Gravity and Absorption Infinity of Aggregate to Asphalt

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6. Loss on Heating LoH

This examination aims to determine the weight reduction due to evaporation of volatile materials in the asphalt. Examination procedures follow AASHTO T - 79-88 or ASTM D- 1754-83 or SNI 06-2440-1991.

a. Sieve Analysis

This examination was intended to determine the gradation, both coarse aggregate and fine aggregates. Examination procedures refer to AASHTO T27 - 88 or SNI 03-1968-1990.

b. Specific Gravity and Absorption

b Tests of Aggregate Aggregate tests conduct in this study was to fulfill the requirements of aggregate specification of Bina Marga standard, except for grain shape and surface composition.

1. Coarse Aggregates

The coarse aggregate used should have rough surface, angular sharp and clean from other materials that could interfere with the binding process. Aggregates are used in the form of crush stone in the dry condition. The types of test conduct on aggregates are as follows. This examination was intended to determine the bulk specific gravity , saturated surface dry gravity SSD and apparent specific gravity of coarse aggregate. Bulk specific gravity was the ratio of aggregate dry weight and the weight of the contents of distill water equal to the aggregate in a saturated condition at a certain temperature. The Saturated Surface Dry SSD was the ratio between the weight of dry aggregate weight of distill water surface and whose contents equal to aggregate content in the dry state at a certain temperature. Apparent Specific Gravity was the ratio of aggregate dry weight and the weight of distill water whose contents equal to aggregate content in the dry condition at a certain temperature. Absorption was the percentage of water weight that can be absorb by the pores of dry aggregate. Investigation of procedures for coarse aggregate refers to AASHTO T85-88 or SNI 03-1969-1990. 17

c. Infinity of Aggregate to Asphalt

This examination was intended to determine the aggregate viscidity to asphalt. Stickiness was the percentage of aggregate to asphalt-cover rock surface area to the whole surface of the asphalt aggregate. Examination procedures refer to the SNI 03-2439-1991.

d. Abrasion with Los Angeles Machine