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<p>An important step towards green concrete, sustainable development, and conservation of natural resources is the recycling of agricultural and industrial waste materials instead of cement in civil infrastructure and construction. This study investigates the shear behavior of reinforced concrete (RC) beams containing 0% and 10% of rice husk ash (RHA), glass powder (GP), and ground granulated furnace slag (GGBS) as supplementary cementitious materials (SCMs) after being exposed to high temperatures. Twelve RC beams were cast; four beams were tested at room temperature, while the remaining eight were tested after being exposed to high temperatures of 400&#xa0;°C and 600&#xa0;°C for 120&#xa0;min, followed by natural cooling. Observations revealed that incorporating RHA, GP, and GGBS significantly influenced the thermal performance of concrete, reducing the internal temperature gradient and enhancing thermal resistance. Adding 10% RHA, GP, or GGBS improves the shear strength, stiffness, and toughness of the tested beams. At ambient temperature, the shear strength of the tested beams containing 10% of RHA, GP, or GGBS showed increases of 14.5%, 9.5%, and 8.1%, respectively, compared to the reference beam. The addition of 10% RHA, GP, or GGBS had a positive impact on the residual shear strength of heated beams. Exposure to 400&#xa0;°C and 600&#xa0;°C reduces beam strength compared to unheated beams, the shear capacity of ordinary RC beams exposed to 400&#xa0;°C and 600&#xa0;°C was decreased by about 8.8% and 21.0%, respectively compared to unheated beams. However, beams with 10% RHA, GP, or GGBS show better mechanical properties, stiffness, shear strength, and toughness than those heated without supplementary materials. Finally, a comparison between the experimental results and the predictions of two techniques, ACI-318 (2019) and ECP 203-2020, showed satisfactory concordance.</p>

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Effect of Agricultural and Industrial Waste Materials as Supplementary Cementitious Materials on the Shear Behavior of RC Beams Exposed to Elevated Temperatures

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • Mahmoud. A. M. Hassanean,
  • Ahmed Ramadan Elsayed,
  • Mahmoud Elsayed

摘要

An important step towards green concrete, sustainable development, and conservation of natural resources is the recycling of agricultural and industrial waste materials instead of cement in civil infrastructure and construction. This study investigates the shear behavior of reinforced concrete (RC) beams containing 0% and 10% of rice husk ash (RHA), glass powder (GP), and ground granulated furnace slag (GGBS) as supplementary cementitious materials (SCMs) after being exposed to high temperatures. Twelve RC beams were cast; four beams were tested at room temperature, while the remaining eight were tested after being exposed to high temperatures of 400 °C and 600 °C for 120 min, followed by natural cooling. Observations revealed that incorporating RHA, GP, and GGBS significantly influenced the thermal performance of concrete, reducing the internal temperature gradient and enhancing thermal resistance. Adding 10% RHA, GP, or GGBS improves the shear strength, stiffness, and toughness of the tested beams. At ambient temperature, the shear strength of the tested beams containing 10% of RHA, GP, or GGBS showed increases of 14.5%, 9.5%, and 8.1%, respectively, compared to the reference beam. The addition of 10% RHA, GP, or GGBS had a positive impact on the residual shear strength of heated beams. Exposure to 400 °C and 600 °C reduces beam strength compared to unheated beams, the shear capacity of ordinary RC beams exposed to 400 °C and 600 °C was decreased by about 8.8% and 21.0%, respectively compared to unheated beams. However, beams with 10% RHA, GP, or GGBS show better mechanical properties, stiffness, shear strength, and toughness than those heated without supplementary materials. Finally, a comparison between the experimental results and the predictions of two techniques, ACI-318 (2019) and ECP 203-2020, showed satisfactory concordance.