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<p>The self-compacting concrete can be defined as that which is capable of flowing and compacting under its own weight without any external vibrations. This study explores thermal ash aggregate (TAA) ‘s effectiveness as a substitute for natural coarse aggregate within SCC. The mix is prepared as per IS 10262. Evaluation of fresh properties was conducted as per EFNARC. The control mix of the present study contained cement (380 kg/m³), fly ash (180 kg/m³), fine aggregate (760 kg/m³), coarse aggregate (890 kg/m³), water (188 kg/m³) and Fosroc SP430 super plasticiser (1.4% by weight of cement). TAA was employed in proportions ranging from 20% to 100% to partially replace the coarse aggregate. Results achieved slump flow of 674&#xa0;mm − 665&#xa0;mm, V-funnel time of 9.5 s − 8 s and L-box ratio of 0.94 − 0.82, satisfying EFNARC limits. The compressive strength of cube samples resulting from 28 days of curing showed an increase from 37&#xa0;MPa to 41&#xa0;MPa. Split tensile strength as well as flexural strength also showed an increase. The assessment of durability showed that with the increase in TAA, the performance improved, where RCPT values decreased by a maximum of 3.8% at 56 days and 3.3% at 90 days. Furthermore, the strength loss due to acid decreased from 5.95% to 3.90% in comparison to the control mix. The research found thermal ash aggregate to be an effective sustainable alternative for SCC performance without compromising engineering properties.</p>

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Performance of thermal ash aggregate as coarse aggregate replacement in self-compacting concrete

  • 期刊论文

  • 发表日期：

    2026年7月13日

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  • T. JayaKrishna,
  • Giridhar Valikala

摘要

The self-compacting concrete can be defined as that which is capable of flowing and compacting under its own weight without any external vibrations. This study explores thermal ash aggregate (TAA) ‘s effectiveness as a substitute for natural coarse aggregate within SCC. The mix is prepared as per IS 10262. Evaluation of fresh properties was conducted as per EFNARC. The control mix of the present study contained cement (380 kg/m³), fly ash (180 kg/m³), fine aggregate (760 kg/m³), coarse aggregate (890 kg/m³), water (188 kg/m³) and Fosroc SP430 super plasticiser (1.4% by weight of cement). TAA was employed in proportions ranging from 20% to 100% to partially replace the coarse aggregate. Results achieved slump flow of 674 mm − 665 mm, V-funnel time of 9.5 s − 8 s and L-box ratio of 0.94 − 0.82, satisfying EFNARC limits. The compressive strength of cube samples resulting from 28 days of curing showed an increase from 37 MPa to 41 MPa. Split tensile strength as well as flexural strength also showed an increase. The assessment of durability showed that with the increase in TAA, the performance improved, where RCPT values decreased by a maximum of 3.8% at 56 days and 3.3% at 90 days. Furthermore, the strength loss due to acid decreased from 5.95% to 3.90% in comparison to the control mix. The research found thermal ash aggregate to be an effective sustainable alternative for SCC performance without compromising engineering properties.