PSI - Issue 70

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

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3.2 Mechanical Properties 3.2.1 Comparison of crushing test

Fig.6 Graph Denoting Comparison of Crushing Value In testing mechanical properties of aggregate the crushing value plays a major role as it defines the relative resistance of an aggregate to crushing under a gradually applied compressive load. However, if the aggregate is being used in roadworks it must be strong enough to resist crushing under traffic loads and load compaction. As per IS383, the crushing strength of conventional aggregate should be lesser than 30 for structural applications. It is observed that 8M aggregate has lowest value indicating higher strength than other 10M and 12M aggregate. The influence of oven curing has further enhanced the property which is due to the acceleration of the reaction in the formation of Si-Al gels. In cold bonded aggregate the 8 molarity aggregate has 33% lesser crushing value than two Molarities whereas in oven cured aggregates the 8M aggregate has 60% lesser crushing value than other Molarities (Fig.6). As the crushing value is considered as the important property, the optimum value is taken as 8M oven cured aggregate. 3.2.2 Comparison of impact test

Fig.7 Graph Denoting Comparison of Impact Value The aggregate impact value test assesses how well aggregates can withstand sudden impacts, which is crucial for road construction applications where aggregates are subjected to heavy traffic load. A lower impact value indicates a tougher aggregate, meaning it is more resistant to breaking down under impact loads. Hence the impact value of both the cold bonded and oven cured aggregate are compared. As per IS383 standards, the impact value of aggregate should be lesser than 30 for road applications. The results shows that all the aggregate has achieved impact value of less than 30. In cold bonded aggregates, 8M aggregate has 78% lower impact value than 10M aggregate which is due