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<p>This project seeks to provide environmentally sustainable self-compacting concrete of superior quality at little expense. Five combinations of eco-friendly self-compacting concrete were formulated to achieve this objective by decreasing the cement content by 35% and substituting it with fine limestone. As a preliminary phase, increasing proportions of concrete waste gravel were incorporated at 0, 25, 50, 75, and 100%. The ratio of 50% was the maximum value that met the necessary criteria for self-compacting concrete. In the second stage, fine limestone was substituted with fine natural pozzolan in increments of 20%, ranging from 0 to 100%. The performance of Eco-SCC in its fresh state was evaluated by the following tests: slump test, J-ring, flow time test, V-funnel, L-box, and sieve stability tests. The physical parameters of absorption, porosity, and ultrasonic readings were evaluated. The compressive strength was assessed at 7, 28, 90, 120, and 180&#xa0;days. The results show that 50% recycled concrete aggregate is the optimal solution for satisfying SCC standards and environmental considerations. Substituting fine limestone with 60% and 80% fine natural pozzolans yielded favorable outcomes for eco-friendly self-compacting concrete in the fresh-state, physical and mechanical qualities.</p>

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Impact of Cementitious Additives on the Fresh State and Physico-Mechanical Characteristics of Eco-Self-Compacting Concrete Produced with Recycled Concrete Aggregate

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Bachir Nezergui,
  • Mohammed Omrane,
  • Taha Hocine Douara,
  • Marouane Amrane

摘要

This project seeks to provide environmentally sustainable self-compacting concrete of superior quality at little expense. Five combinations of eco-friendly self-compacting concrete were formulated to achieve this objective by decreasing the cement content by 35% and substituting it with fine limestone. As a preliminary phase, increasing proportions of concrete waste gravel were incorporated at 0, 25, 50, 75, and 100%. The ratio of 50% was the maximum value that met the necessary criteria for self-compacting concrete. In the second stage, fine limestone was substituted with fine natural pozzolan in increments of 20%, ranging from 0 to 100%. The performance of Eco-SCC in its fresh state was evaluated by the following tests: slump test, J-ring, flow time test, V-funnel, L-box, and sieve stability tests. The physical parameters of absorption, porosity, and ultrasonic readings were evaluated. The compressive strength was assessed at 7, 28, 90, 120, and 180 days. The results show that 50% recycled concrete aggregate is the optimal solution for satisfying SCC standards and environmental considerations. Substituting fine limestone with 60% and 80% fine natural pozzolans yielded favorable outcomes for eco-friendly self-compacting concrete in the fresh-state, physical and mechanical qualities.