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<p>Self-compacting concrete (SCC) is a specialized type of concrete that autonomously consolidates without external assistance. Previous literature has concentrated on the development of mixture design, emphasizing its distinctive fresh characteristics, strength, and durability, influenced by various supplementary cementitious materials (SCMs). Nonetheless, there exists a paucity of studies examining the retention time of fresh SCC under the influence of various mineral and chemical admixtures. This study aims to assess the retention performance of concrete in its fresh condition and its strength performance in the hardened state. Mineral admixtures, specifically fly ash and ground granulated blast furnace slag (GGBS), were utilized as partial substitutes (0%, 10%, 20%, and 30%) for cement, in conjunction with chemical admixtures, namely Polycarboxylic ether (PCE) and sulfonated naphthalene formaldehyde (SNF) superplasticizers. The results indicated that the SCC mixtures containing 30% fly ash exhibited superior retention with both PCE and SNF in comparison to other SCC mixtures. In terms of strength performance, SCC with 30% GGBS has demonstrated effective strength at 3, 7, 14, and 28 days. This indicated that the spherical morphology of fly ash had excellent flowability and retention characteristics in its fresh state, while demonstrating slower performance in the hardened state due to its sluggish pozzolanic reactivity at early ages. Nonetheless, SCC mixtures with GGBS exhibited superior strength performance, whereas Portland cement-based SCC combinations shown diminished retention and strength performance.</p>

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Performance assessment on flow retention and strength of low-carbon SCC with the influence of SCMs and chemical admixtures

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Rakesh Elumalai,
  • S. Karthiyaini,
  • Adapala Sunny Suprakash,
  • M. Shanmugasundaram

摘要

Self-compacting concrete (SCC) is a specialized type of concrete that autonomously consolidates without external assistance. Previous literature has concentrated on the development of mixture design, emphasizing its distinctive fresh characteristics, strength, and durability, influenced by various supplementary cementitious materials (SCMs). Nonetheless, there exists a paucity of studies examining the retention time of fresh SCC under the influence of various mineral and chemical admixtures. This study aims to assess the retention performance of concrete in its fresh condition and its strength performance in the hardened state. Mineral admixtures, specifically fly ash and ground granulated blast furnace slag (GGBS), were utilized as partial substitutes (0%, 10%, 20%, and 30%) for cement, in conjunction with chemical admixtures, namely Polycarboxylic ether (PCE) and sulfonated naphthalene formaldehyde (SNF) superplasticizers. The results indicated that the SCC mixtures containing 30% fly ash exhibited superior retention with both PCE and SNF in comparison to other SCC mixtures. In terms of strength performance, SCC with 30% GGBS has demonstrated effective strength at 3, 7, 14, and 28 days. This indicated that the spherical morphology of fly ash had excellent flowability and retention characteristics in its fresh state, while demonstrating slower performance in the hardened state due to its sluggish pozzolanic reactivity at early ages. Nonetheless, SCC mixtures with GGBS exhibited superior strength performance, whereas Portland cement-based SCC combinations shown diminished retention and strength performance.