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<p>As a novel soil stabilization material, polymers are increasingly applied in geotechnical reinforcement. During curing, the polymer filling the interstices between sand particles gradually transforms from a liquid into a high-strength elastomer, thereby enhancing sand strength. To apparently elucidate the evolution of polymer matrix distribution in reinforced sand, including polymer-filled porosity, pore size distribution, and fractal characteristics, nuclear magnetic resonance (NMR) was employed to investigate polymer distribution under different polymer contents and curing time. The results demonstrate that (1) polymer-filled porosity decreases exponentially with curing time and increases with higher polymer content; (2) polymer-filled pores can be classified into micropores (0.002–0.04&#xa0;µm), mesopores (0.04–8&#xa0;µm), and macropores (8–20&#xa0;µm), and with increasing curing time, both the mean pore size and the proportion of macropores decrease, while the fraction of micropores increases; (3) the fractal dimension of polymer-filled pores exhibits a non-monotonic variation during curing, with an overall increase in pore structure complexity; and (4) based on the quantitative NMR trends, it is inferred that moisture evaporation from polymer films induces film shrinkage and a reduction in occupied volume, while air curing conceptually promote the development of higher strength and toughness in the polymer film. By characterizing the curing-dependent evolution of polymer distribution, this work provides a proxy and reveals the inferred microscopic reinforcement mechanisms governing polymer-stabilized sand during the curing process.</p>

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Evolution of Polymer-Filled Pore Structure in Stabilized Sand During Curing

  • 期刊论文

  • 发表日期：

    2026年7月2日

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  • Ying Wang,
  • Haiqin Zang,
  • Yuyi Liu,
  • Lei Wang,
  • Zhihao Chen

摘要

As a novel soil stabilization material, polymers are increasingly applied in geotechnical reinforcement. During curing, the polymer filling the interstices between sand particles gradually transforms from a liquid into a high-strength elastomer, thereby enhancing sand strength. To apparently elucidate the evolution of polymer matrix distribution in reinforced sand, including polymer-filled porosity, pore size distribution, and fractal characteristics, nuclear magnetic resonance (NMR) was employed to investigate polymer distribution under different polymer contents and curing time. The results demonstrate that (1) polymer-filled porosity decreases exponentially with curing time and increases with higher polymer content; (2) polymer-filled pores can be classified into micropores (0.002–0.04 µm), mesopores (0.04–8 µm), and macropores (8–20 µm), and with increasing curing time, both the mean pore size and the proportion of macropores decrease, while the fraction of micropores increases; (3) the fractal dimension of polymer-filled pores exhibits a non-monotonic variation during curing, with an overall increase in pore structure complexity; and (4) based on the quantitative NMR trends, it is inferred that moisture evaporation from polymer films induces film shrinkage and a reduction in occupied volume, while air curing conceptually promote the development of higher strength and toughness in the polymer film. By characterizing the curing-dependent evolution of polymer distribution, this work provides a proxy and reveals the inferred microscopic reinforcement mechanisms governing polymer-stabilized sand during the curing process.