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<p>The practice of incorporating end-of-life tires in quasi-brittle cementitious composites, not only facilitates their safe disposal and advances sustainability goals through the preservation of virgin aggregate, but also imparts significant improvements in key engineering properties, such as higher energy absorption, damping capacity, etc. However, the downside of the rubberized composite is a very high strength deficit caused primarily by the extreme hydrophobicity and the relatively very low elastic modulus of crumb rubber. The study aimed to modify the crumb rubber surface with a rubber surface modifying substrate (RSMS) comprising waste ground glass fiber (GGF), in proportions varying between 0 and 20% by weight of crumb rubber, and 5% NaOH, premixed and applied to crumb rubber surface to enhance its physical properties and improve interfacial bonding with the binder matrix of alkali activated composite (AAC). The efficiency of the RSMS pre-treatment in the rubberized GGBFS based AAC was assessed through mechanical property testing and microstructural characterization. Surface modification using RSMS with varying GGF content resulted in up to a 36.2% increase in compressive strength and a 4.29% increase in density (2139&#xa0;kg/m<sup>3</sup>) at 20% GGF, along with a maximum flexural strength of 6.89&#xa0;MPa (61.7% increase) and a splitting tensile strength of 2.81&#xa0;MPa. The highest impact resistance was achieved with the 15%GGF mix at 1540&#xa0;J; 1.4 times increase over the control. The results confirmed that RSMS with 10–15% GGF notably enhanced mechanical performance of rubberized composites while maintaining superior impact resistance.</p>

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Influence of surface modification of crumb rubber with waste ground glass fiber on the overall mechanical behaviour of rubberized alkali activated composites

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Ayman Sabry Shihata,
  • Youssef Ali Saeed,
  • Khatib Zada Farhan

摘要

The practice of incorporating end-of-life tires in quasi-brittle cementitious composites, not only facilitates their safe disposal and advances sustainability goals through the preservation of virgin aggregate, but also imparts significant improvements in key engineering properties, such as higher energy absorption, damping capacity, etc. However, the downside of the rubberized composite is a very high strength deficit caused primarily by the extreme hydrophobicity and the relatively very low elastic modulus of crumb rubber. The study aimed to modify the crumb rubber surface with a rubber surface modifying substrate (RSMS) comprising waste ground glass fiber (GGF), in proportions varying between 0 and 20% by weight of crumb rubber, and 5% NaOH, premixed and applied to crumb rubber surface to enhance its physical properties and improve interfacial bonding with the binder matrix of alkali activated composite (AAC). The efficiency of the RSMS pre-treatment in the rubberized GGBFS based AAC was assessed through mechanical property testing and microstructural characterization. Surface modification using RSMS with varying GGF content resulted in up to a 36.2% increase in compressive strength and a 4.29% increase in density (2139 kg/m3) at 20% GGF, along with a maximum flexural strength of 6.89 MPa (61.7% increase) and a splitting tensile strength of 2.81 MPa. The highest impact resistance was achieved with the 15%GGF mix at 1540 J; 1.4 times increase over the control. The results confirmed that RSMS with 10–15% GGF notably enhanced mechanical performance of rubberized composites while maintaining superior impact resistance.