PSI - Issue 70

Maahira M. et al. / Procedia Structural Integrity 70 (2025) 642–649

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The manufactured aggregates are tested for flakiness index as per IS 2386-1963. As the artificial aggregates are manufactured using agglomeration method, these aggregates are not much flaky. As per IS383-2016, the flakiness index value of the conventional aggregate should be less than 40. In the artificial aggregate, irrespective of type of aggregate and molarity, all the values are within the permissible limits. The artificial aggregates have attained a value ranging from 16 to 18 at a percentage reduction of 60% with the IS value (Fig.3). Flakiness index of 8M and 10M aggregate differs by 0.1% but 12M aggregate flakiness index differs by 1% from the other two Molarities. 3.1.2 Elongation Index Test

Fig.4 Graph Denoting Elongation Index Value of Different Molarities

The elongation index of the aggregate were tested as per IS2386 standards. During pelletization process the aggregate agglomerate by obtaining an oval shape hence it has a higher elongation index value. As per IS383-2016, the elongation index value of the conventional aggregate should be less than 40. In the artificial aggregate, irrespective of type of aggregate and molarity, all the values are within the permissible limits. The 8M aggregate has higher elongation index value of 25.8 with an increase of 35.5% than the IS value whereas, 10M and 12M aggregate has lesser value than the specified value with a 49% reduction approximately (Fig.4). 3.1.3 Comparison of specific gravity test The specific gravity of conventional aggregate is generally in the range of 2.5 to 3 according to IS standards. It is observed that these artificial aggregates are less dense than the conventional aggregate On Comparing the specific gravity of cold bonded aggregate and oven cured aggregate it is observed that the oven cured aggregate has the high specific gravity value than the cold bonded aggregates resulting in higher strength.

Fig.5 Graph Denoting Comparison of Specific Gravity As the aggregates are manufactured using agglomeration process without any mechanical pressure, they contains pores on their surface and hence the apparent specific gravity of aggregates are low. The process of oven drying process accelerates the reaction process and results in deposition of products in the pores and makes them denser and solid structure (Fig.5).