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<p>External prestressing is an effective strengthening technique in which prestressing tendons are positioned completely outside the concrete member and anchored at its ends, allowing easier installation, inspection, and maintenance. This study experimentally investigates the structural behavior of reactive powder concrete (RPC) beams strengthened with externally prestressed steel strands. Five RPC beam specimens with dimensions of 1700&#xa0;mm in length, 400&#xa0;mm in height, and 180&#xa0;mm in width were fabricated and tested under monotonic loading. The experimental program focused on evaluating the influence of three parameters: the number of deviators, the level of external prestressing force, and the eccentricity of the prestressing strands. Two deviator configurations were considered: one deviator located at the midspan of the beam and two deviators positioned at the third points of the span. Two levels of prestressing force were applied, corresponding to 65% and 85% of the ultimate tensile strength of the prestressing strands. Additionally, two eccentricity levels were investigated by placing the prestressing strands either 220&#xa0;mm below the neutral axis (at the bottom of the beam) or at mid-depth (zero eccentricity). The test results revealed that external prestressing significantly enhances the structural performance of RPC beams. The tested strengthened beams showed an increase in ultimate load carrying capacity of up to 117.38% compared with the reference specimen. Within the scope of the experimental program, reducing the strand eccentricity to zero increased the ultimate load capacity by approximately 61.19%, while beams with 220&#xa0;mm eccentricity showed an increase of about 107.37%. In terms of cracking behavior, the first cracking load increased by 282.4% at a prestressing level of 85% of the strand tensile strength, and by about 188.7% at 65%, compared with the reference beam.</p>

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Flexural Behavior of Reactive Powder Concrete Beams Strengthened by External Prestressing

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Aamer Najim Abbas,
  • Mohammed J. Hamood,
  • Wael Shawky Abdulsahib

摘要

External prestressing is an effective strengthening technique in which prestressing tendons are positioned completely outside the concrete member and anchored at its ends, allowing easier installation, inspection, and maintenance. This study experimentally investigates the structural behavior of reactive powder concrete (RPC) beams strengthened with externally prestressed steel strands. Five RPC beam specimens with dimensions of 1700 mm in length, 400 mm in height, and 180 mm in width were fabricated and tested under monotonic loading. The experimental program focused on evaluating the influence of three parameters: the number of deviators, the level of external prestressing force, and the eccentricity of the prestressing strands. Two deviator configurations were considered: one deviator located at the midspan of the beam and two deviators positioned at the third points of the span. Two levels of prestressing force were applied, corresponding to 65% and 85% of the ultimate tensile strength of the prestressing strands. Additionally, two eccentricity levels were investigated by placing the prestressing strands either 220 mm below the neutral axis (at the bottom of the beam) or at mid-depth (zero eccentricity). The test results revealed that external prestressing significantly enhances the structural performance of RPC beams. The tested strengthened beams showed an increase in ultimate load carrying capacity of up to 117.38% compared with the reference specimen. Within the scope of the experimental program, reducing the strand eccentricity to zero increased the ultimate load capacity by approximately 61.19%, while beams with 220 mm eccentricity showed an increase of about 107.37%. In terms of cracking behavior, the first cracking load increased by 282.4% at a prestressing level of 85% of the strand tensile strength, and by about 188.7% at 65%, compared with the reference beam.