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<p>Nanomaterial-modified cementitious composites have shown significant promise in improving the mechanical as well as thermal performance of concrete; however, little research has focused on the combined effect of graphene oxide (GO) and fly ash (FA) on bond strength along with impact resistance at high temperatures. Previous research has mostly concentrated on compression strength at ambient settings, with inadequate emphasis paid to residual mechanical properties following fire exposure. As a result, the purpose of this study is to look into the combined effects of 20% substitute for fly ash along with 0.08% graphene oxide incorporation on compression strength, bond strength, along with energy absorption properties of M30 grade concrete, both at room temperature and after being exposed to temperatures varying from 200 to 800&#xa0;°C. IS 10262:2019 was followed in the construction of the concrete mixtures, and samples then water-cured for 28 days before being heated under regulated conditions for four hours in a muffle furnace. As per IS 2770 (Part 1):2007, the pull-out test was used to measure bond strength, and a drop-weight testing method was used to measure impact resistance. The findings show that, in comparison to ordinary concrete, the hybrid mix (20% FA + 0.08% GO) attained a maximum compression strength increase of 38% at 56 days. Bond strength increased from 9.36 to 13.46&#xa0;MPa at room temperature, an improvement of almost 35%. Similarly, compared to 407.07&#xa0;J (≈ 26%) for standard concrete, impact energy absorption rose to 1506.17&#xa0;J at room temperature then retained 671.67&#xa0;J (≈ 45%) at 800&#xa0;°C. Improved performance consistency was validated by statistical analysis utilizing standard deviation along with coefficient of variation. The results show the FA–GO mixed system greatly improves strength, toughness, as well as fire resistance, demonstrating its potential for high-temperature and sustainable structural applications.</p>

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Influence of graphene oxide and fly ash on impact energy and bond strength of cementitious composites

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • I. Ramana,
  • N. Parthasarathi

摘要

Nanomaterial-modified cementitious composites have shown significant promise in improving the mechanical as well as thermal performance of concrete; however, little research has focused on the combined effect of graphene oxide (GO) and fly ash (FA) on bond strength along with impact resistance at high temperatures. Previous research has mostly concentrated on compression strength at ambient settings, with inadequate emphasis paid to residual mechanical properties following fire exposure. As a result, the purpose of this study is to look into the combined effects of 20% substitute for fly ash along with 0.08% graphene oxide incorporation on compression strength, bond strength, along with energy absorption properties of M30 grade concrete, both at room temperature and after being exposed to temperatures varying from 200 to 800 °C. IS 10262:2019 was followed in the construction of the concrete mixtures, and samples then water-cured for 28 days before being heated under regulated conditions for four hours in a muffle furnace. As per IS 2770 (Part 1):2007, the pull-out test was used to measure bond strength, and a drop-weight testing method was used to measure impact resistance. The findings show that, in comparison to ordinary concrete, the hybrid mix (20% FA + 0.08% GO) attained a maximum compression strength increase of 38% at 56 days. Bond strength increased from 9.36 to 13.46 MPa at room temperature, an improvement of almost 35%. Similarly, compared to 407.07 J (≈ 26%) for standard concrete, impact energy absorption rose to 1506.17 J at room temperature then retained 671.67 J (≈ 45%) at 800 °C. Improved performance consistency was validated by statistical analysis utilizing standard deviation along with coefficient of variation. The results show the FA–GO mixed system greatly improves strength, toughness, as well as fire resistance, demonstrating its potential for high-temperature and sustainable structural applications.