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<p>This study offers a direct comparative assessment of ultra-high-performance geopolymer concrete (UHPGC) and ultra-high-performance concrete (UHPC). This study focuses on the roles and impacts of fly ash (FA), metakaolin (MK), and ground granulated blast furnace slag (GBFS) on their behavior and performance at elevated temperatures. Phase I involved replacing 25% of ordinary Portland cement (OPC) with either FA, GBFS, or MK. Phase II involved partial replacement of GBFS (10–50%) with either FA or MK. Control mixes were made with UHPGC with full OPC and full GBFS. The newly formed UHPGC was assessed based on new state, mechanical, and transport properties. The effect of increasing temperature on UHPGC (150, 300, 450, 600, and 750) was studied, and the effect on compressive strength (CS) was also observed. The highest CS (195&#xa0;MPa) at 180 days was reported for the UHPC formulation with 25% MK, followed by the formulations with FA and GBFS. The GBFS750-MK250 UHPGC mixture exhibited the highest CS at 166&#xa0;MPa. Compared with UHPC, UHPGC exhibited superior early strength, reaching 119&#xa0;MPa at 3 days. The incorporation of MK enhanced the tensile and flexural strengths of UHPC and UHPGC to 11.9&#xa0;MPa and 18.5&#xa0;MPa and 11.7&#xa0;MPa and 17.8&#xa0;MPa, respectively. Geopolymer systems exhibit significant heat resistance, with density reductions between 12.4% and 13.7% for UHPC and 10.6–12.3% for UHPGC at 750&#xa0;°C. Substituting 25% of GBFS with MK yielded optimal transport parameters for the GBFS750-MK250 combination, which included a chloride penetration resistance of 228 coulombs, a water sorptivity of 2.21 × 10⁻⁴ mm/ s<sup>0.5</sup>, and a water permeability of 1.25 × 10⁻¹¹ cm/s.</p>

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Performance-Based Comparison of UHPC and UHPGC Incorporating FA, GBFS, and MK Under Ambient and Elevated Temperatures

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Mohamed Amin,
  • Ashraf M. Heniegal,
  • Abdullah M. Zeyad,
  • Ibrahim Saad Agwa,
  • Mohy S. Fattouh

摘要

This study offers a direct comparative assessment of ultra-high-performance geopolymer concrete (UHPGC) and ultra-high-performance concrete (UHPC). This study focuses on the roles and impacts of fly ash (FA), metakaolin (MK), and ground granulated blast furnace slag (GBFS) on their behavior and performance at elevated temperatures. Phase I involved replacing 25% of ordinary Portland cement (OPC) with either FA, GBFS, or MK. Phase II involved partial replacement of GBFS (10–50%) with either FA or MK. Control mixes were made with UHPGC with full OPC and full GBFS. The newly formed UHPGC was assessed based on new state, mechanical, and transport properties. The effect of increasing temperature on UHPGC (150, 300, 450, 600, and 750) was studied, and the effect on compressive strength (CS) was also observed. The highest CS (195 MPa) at 180 days was reported for the UHPC formulation with 25% MK, followed by the formulations with FA and GBFS. The GBFS750-MK250 UHPGC mixture exhibited the highest CS at 166 MPa. Compared with UHPC, UHPGC exhibited superior early strength, reaching 119 MPa at 3 days. The incorporation of MK enhanced the tensile and flexural strengths of UHPC and UHPGC to 11.9 MPa and 18.5 MPa and 11.7 MPa and 17.8 MPa, respectively. Geopolymer systems exhibit significant heat resistance, with density reductions between 12.4% and 13.7% for UHPC and 10.6–12.3% for UHPGC at 750 °C. Substituting 25% of GBFS with MK yielded optimal transport parameters for the GBFS750-MK250 combination, which included a chloride penetration resistance of 228 coulombs, a water sorptivity of 2.21 × 10⁻⁴ mm/ s0.5, and a water permeability of 1.25 × 10⁻¹¹ cm/s.