Abstract: The optimized coarse granite aggregate gradation selection tests were performed using interference of particles and Talbol’s theory through three different compaction methods: heavy compaction, vibratory table, and hand compaction. The objective of the testing was to obtain the optimized gradation of granite aggregates with a maximum grain size of 53mm. The results indicate that optimized gradation should have the ratio of the main grain size D₀ (26.55～53mm) : D₁ (4.74 ～26.5 mm) = 6:4 and a Talbol Index n =0.5. Under a moisture content of 4.2%, the maximum dry density of 2.327 g/cm3 can be achieved by the heavy compaction method. This dry density is 1.037 time of the dry density prepared by vibratory table and 1.12 time that of prepared by hand compaction. The content of grain sizes between 04.75 mm has 6.8% change under heavy compaction method. This content is 1.19 times that of prepared by the vibratory table method and 1.097 times that of prepared by the hand compaction method. Higher dry density has better mechanical properties.

Key words: Gradation, Sample Preparation Method, Granite Aggregates, Largesize Aggregates, Mechanical Properties