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<p>This study aims to elucidate the stabilizing mechanism for soft clay (SC) roadbed through the optimal combination of Ground granulated blast furnace slag (GGBFS) and polypropylene (PP) fibers. A series of unconfined compressive strength (UCS) and flexural strength tests were conducted, yielding the following results. (1) The lime content of 6% and sodium silicate content of 3% are sufficient to effectively activate the pozzolanic reaction of GGBFS. (2) With increasing proportions of activated GGBFS, the UCS first increases and then decreases, reaching its maximum value at a 25% content of activated GGBFS. (3) The results indicate that both the UCS and flexural strength initially increase and subsequently decrease with increasing polypropylene (PP) fiber content, indicating an optimal fiber content of 0.5%. Based on the test results, response surface methodology (RSM) was employed for further analysis to identify the optimal combination ratio of GGBFS and PP fibers. Ultimately, a novel binder was identified, with the optimal component ratio for UCS being GGBFS: lime: sodium silicate: pp fiber = 27: 6: 3: 0.545. For flexural strength, the optimal ratio was determined to be GGBFS: lime: sodium silicate: PP fiber = 28.6: 6: 3: 0.56. This research establishes a robust foundation for developing effective strategies to improve the performance of SC in roadbeds.</p>

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Eco-Friendly Improvement of Soft Clay Using GGBFS and Polypropylene Fibers

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • ChuanCheng Zhang,
  • JieSheng Liu,
  • Zhanwen He

摘要

This study aims to elucidate the stabilizing mechanism for soft clay (SC) roadbed through the optimal combination of Ground granulated blast furnace slag (GGBFS) and polypropylene (PP) fibers. A series of unconfined compressive strength (UCS) and flexural strength tests were conducted, yielding the following results. (1) The lime content of 6% and sodium silicate content of 3% are sufficient to effectively activate the pozzolanic reaction of GGBFS. (2) With increasing proportions of activated GGBFS, the UCS first increases and then decreases, reaching its maximum value at a 25% content of activated GGBFS. (3) The results indicate that both the UCS and flexural strength initially increase and subsequently decrease with increasing polypropylene (PP) fiber content, indicating an optimal fiber content of 0.5%. Based on the test results, response surface methodology (RSM) was employed for further analysis to identify the optimal combination ratio of GGBFS and PP fibers. Ultimately, a novel binder was identified, with the optimal component ratio for UCS being GGBFS: lime: sodium silicate: pp fiber = 27: 6: 3: 0.545. For flexural strength, the optimal ratio was determined to be GGBFS: lime: sodium silicate: PP fiber = 28.6: 6: 3: 0.56. This research establishes a robust foundation for developing effective strategies to improve the performance of SC in roadbeds.