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This study aimed to produce modified reactive powder concrete (RPC) and present fundamental information to develop an economical RPC. By limiting the maximum size of aggregates to 2.36 mm and using micro-size particles like silica fume and quartz powder with different locally available fine aggregates like quartz sand (QS), river sand (RS), and manufactured sand (MS) at various particle size distributions. This study examines the workability, compressive strength, and microstructure properties of the RPC under normal and hot air curing conditions. From the 28 days test results, it was observed that RPC with hot air cured (HAC) specimens showed higher compressive strength results when compared with the normal water cured (NWC) specimens. The optimum mix with 840 kg/m3 of cement and 20% Silica fume (SF) showed a compressive strength of 115.6 MPa with quartz sand as fine aggregate under hot air curing. The mix with quartz sand showed a stronger bond between aggregates and powder matrix (ITZ) due to its finer size and homogeneous nature of the RPC mix. The mix with river sand showed higher workability retention even after 45 min of mixing.

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Influence of Different Ingredients on Workability, Mechanical and Microstructural Properties of Reactive Powder Concrete at Different Curing Conditions

  • 会议论文

  • 发表日期：

    2026年

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  • Arava Lekhya,
  • N. Senthil Kumar

摘要

This study aimed to produce modified reactive powder concrete (RPC) and present fundamental information to develop an economical RPC. By limiting the maximum size of aggregates to 2.36 mm and using micro-size particles like silica fume and quartz powder with different locally available fine aggregates like quartz sand (QS), river sand (RS), and manufactured sand (MS) at various particle size distributions. This study examines the workability, compressive strength, and microstructure properties of the RPC under normal and hot air curing conditions. From the 28 days test results, it was observed that RPC with hot air cured (HAC) specimens showed higher compressive strength results when compared with the normal water cured (NWC) specimens. The optimum mix with 840 kg/m3 of cement and 20% Silica fume (SF) showed a compressive strength of 115.6 MPa with quartz sand as fine aggregate under hot air curing. The mix with quartz sand showed a stronger bond between aggregates and powder matrix (ITZ) due to its finer size and homogeneous nature of the RPC mix. The mix with river sand showed higher workability retention even after 45 min of mixing.