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The current study examines how internal curing agent affects the performance of self-curing concrete with 100% replacement of fine aggregate by robo sand, emphasizing sustainable construction solutions. Polyethylene glycol-400 (PEG-400) used as internal curing agent, is known for its ability to retain moisture, thereby enhancing hydration. Experimental work was carried out for M20 and M40 grade concretes, with varying concentrations of PEG-400 at 0.5, 1, and 1.5% by the weight of cement. A control mix without PEG-400 was considered conventional concrete. This research assesses the mechanical properties (split tensile, compression, and flexural strengths) and evaluates durability through water permeability, rapid chloride penetration, and acid attack tests. Non-destructive tests such as ultrasonic pulse velocity tests verified concrete integrity. The analysis demonstrated PEG-400’s effectiveness in improving concrete properties, with 1% of PEG-400 yielding optimal results. This study supports the use of PEG-400 as a self-curing additive and highlights robo sand as an environmentally friendly fine aggregate alternative that improves the overall performance of concrete.

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Mechanical and Durability Properties of Self-curing Concrete by 100% Replacement of Fine Aggregate with Robo Sand

  • 会议论文

  • 发表日期：

    2026年

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  • M. Kalyan,
  • Moinuddin Ahmed,
  • V. Bhikshma,
  • U. Nagaraju,
  • A. Saketh Reddy

摘要

The current study examines how internal curing agent affects the performance of self-curing concrete with 100% replacement of fine aggregate by robo sand, emphasizing sustainable construction solutions. Polyethylene glycol-400 (PEG-400) used as internal curing agent, is known for its ability to retain moisture, thereby enhancing hydration. Experimental work was carried out for M20 and M40 grade concretes, with varying concentrations of PEG-400 at 0.5, 1, and 1.5% by the weight of cement. A control mix without PEG-400 was considered conventional concrete. This research assesses the mechanical properties (split tensile, compression, and flexural strengths) and evaluates durability through water permeability, rapid chloride penetration, and acid attack tests. Non-destructive tests such as ultrasonic pulse velocity tests verified concrete integrity. The analysis demonstrated PEG-400’s effectiveness in improving concrete properties, with 1% of PEG-400 yielding optimal results. This study supports the use of PEG-400 as a self-curing additive and highlights robo sand as an environmentally friendly fine aggregate alternative that improves the overall performance of concrete.