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<p>The significant drying shrinkage associated with geopolymer concrete (GPC) presents a considerable obstacle to its wider adoption. Existing strategies designed to mitigate this drying shrinkage have been inadequate. In this study, polypropylene fiber (PPF) was employed to reduce the drying shrinkage of GPC. The influence of PPF content on both the drying shrinkage and compressive strength of GPC was analyzed. Furthermore, a central pullout test was carried out to evaluate bond performance between GPC and basalt fiber-reinforced polymer (BFRP) reinforcement. The findings indicated that incorporating 0.05 to 0.1% PPF reduced the drying shrinkage of GPC at 28 days by 21.2 to 31.7%. However, when the concentration of PPF increased to 0.15%, its effectiveness in controlling drying shrinkage decreased. Simultaneously, the 28-day compressive strength decreased by 3 to 9%. Additionally, following the incorporation of 0.1% PPF, the maximum bond stress reduced by 1.3 to 7.9%. Finally, the drying shrinkage prediction model that suitable for PPF reinforced GPC was proposed, and the existing bond-slip models between GPC and BFRP bar were evaluated.</p>

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Effect of Polypropylene Fiber on Drying Shrinkage of Geopolymer Concrete and Bond with BFRP Bar

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Haixia Zhang,
  • Diya Cao,
  • Haoyu Wang

摘要

The significant drying shrinkage associated with geopolymer concrete (GPC) presents a considerable obstacle to its wider adoption. Existing strategies designed to mitigate this drying shrinkage have been inadequate. In this study, polypropylene fiber (PPF) was employed to reduce the drying shrinkage of GPC. The influence of PPF content on both the drying shrinkage and compressive strength of GPC was analyzed. Furthermore, a central pullout test was carried out to evaluate bond performance between GPC and basalt fiber-reinforced polymer (BFRP) reinforcement. The findings indicated that incorporating 0.05 to 0.1% PPF reduced the drying shrinkage of GPC at 28 days by 21.2 to 31.7%. However, when the concentration of PPF increased to 0.15%, its effectiveness in controlling drying shrinkage decreased. Simultaneously, the 28-day compressive strength decreased by 3 to 9%. Additionally, following the incorporation of 0.1% PPF, the maximum bond stress reduced by 1.3 to 7.9%. Finally, the drying shrinkage prediction model that suitable for PPF reinforced GPC was proposed, and the existing bond-slip models between GPC and BFRP bar were evaluated.