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This study examines the compressive strength of roller-compacted concrete (RCC) incorporating ground granulated blast-furnace slag (GGBS) using the modified Proctor compaction method. GGBS replaced cement at four levels: 15, 30, 45, and 60%, producing slag-RCC mixtures. These mixtures were compacted in cylindrical and cubic molds using a Proctor hammer to evaluate the influence of sample shape on compressive strength. Additionally, low and high compaction energy levels were applied to assess their effects. Results showed that the conversion coefficient from cylindrical to cubic specimens was lower for slag-RCC than for conventional RCC. The conversion coefficient decreased with increasing compressive strength, depending on the strength level. Increasing compaction energy by 100% led to approximately a 10% increase in compressive strength, while reducing energy by 50% resulted in a similar 10% decrease.

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Influence of Sample Shape and Compaction Energy on the Compressive Strength of Slag-RCC Prepared Using the Modified Proctor Test

  • 会议论文

  • 发表日期：

    2026年

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  • Chau-Tuan Le,
  • My Ngoc-Tra Lam,
  • Trong Nghia-Nguyen

摘要

This study examines the compressive strength of roller-compacted concrete (RCC) incorporating ground granulated blast-furnace slag (GGBS) using the modified Proctor compaction method. GGBS replaced cement at four levels: 15, 30, 45, and 60%, producing slag-RCC mixtures. These mixtures were compacted in cylindrical and cubic molds using a Proctor hammer to evaluate the influence of sample shape on compressive strength. Additionally, low and high compaction energy levels were applied to assess their effects. Results showed that the conversion coefficient from cylindrical to cubic specimens was lower for slag-RCC than for conventional RCC. The conversion coefficient decreased with increasing compressive strength, depending on the strength level. Increasing compaction energy by 100% led to approximately a 10% increase in compressive strength, while reducing energy by 50% resulted in a similar 10% decrease.