Extraction of mineral ore necessitates the removal of overburden, especially in open-cast mining where the extracted overburden is substantial. Previous literature has focused on using mining waste to produce coarse aggregates through pelletization and investigated the factors influencing pellet formation and their applications in concrete. However, there are very limited studies available on using these pelletized aggregates in pavement construction. A major drawback with pelletized aggregates is their high water absorption and low angularity compared to natural aggregates. This problem can be addressed by mixing artificial aggregates with natural aggregates. The present study aims to determine the optimal proportion for blending artificial aggregates (AA) with natural aggregates (NA) to reduce water absorption and increase angularity for pavement applications. The study involves testing water absorption and angularity across different proportions: ̶ 100% AA, 90% AA + 10% NA, 80% AA + 20% NA, 70% AA + 30% NA, 60% AA + 40% NA, and 50% AA + 50% NA. The results indicate that 50% AA + 50% NA yields superior outcomes compared to other proportions. Additionally, the study evaluates the strength characteristics of this optimal blend through aggregate impact value (AIV) and Los Angeles abrasion value (LAV) testing, demonstrating satisfactory results according to IRC:27-2009 and MoRTH 2013 codal specifications. The study can help practitioners in deciding the blend proportions of NA and AA and in promoting the use of mine waste for pavement construction.

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Optimal Blends of Artificial and Natural Aggregates for Enhanced Pavement Performance

  • Nagendra Mondem,
  • Umashankar Balunaini

摘要

Extraction of mineral ore necessitates the removal of overburden, especially in open-cast mining where the extracted overburden is substantial. Previous literature has focused on using mining waste to produce coarse aggregates through pelletization and investigated the factors influencing pellet formation and their applications in concrete. However, there are very limited studies available on using these pelletized aggregates in pavement construction. A major drawback with pelletized aggregates is their high water absorption and low angularity compared to natural aggregates. This problem can be addressed by mixing artificial aggregates with natural aggregates. The present study aims to determine the optimal proportion for blending artificial aggregates (AA) with natural aggregates (NA) to reduce water absorption and increase angularity for pavement applications. The study involves testing water absorption and angularity across different proportions: ̶ 100% AA, 90% AA + 10% NA, 80% AA + 20% NA, 70% AA + 30% NA, 60% AA + 40% NA, and 50% AA + 50% NA. The results indicate that 50% AA + 50% NA yields superior outcomes compared to other proportions. Additionally, the study evaluates the strength characteristics of this optimal blend through aggregate impact value (AIV) and Los Angeles abrasion value (LAV) testing, demonstrating satisfactory results according to IRC:27-2009 and MoRTH 2013 codal specifications. The study can help practitioners in deciding the blend proportions of NA and AA and in promoting the use of mine waste for pavement construction.