Conventional methods for assessing the pore characteristics of nonwoven geotextiles are plagued by several limitations such as low accuracy and lengthy processing time. Consequently, this paper proposed low-field nuclear magnetic resonance (NMR) technology to acquire the pore size distribution (PSD) curves, porosity, and characteristic pore size (CPS) of nonwoven geotextiles. The T2 characteristic spectrum of vacuum-saturated specimens was obtained from low-field NMR tests, while the pore shape coefficient and surface relaxation rates were determined via scanning electron microscopy (SEM) and X-ray computed tomography (CT) three-dimensional (3D) reconstruction technology. The PSD curves and CPS (O90) values were acquired and compared with results from the wet sieving, dry sieving, and CT digital image methods. The results demonstrate that low-field NMR technology can accurately and efficiently determine the CPS of nonwoven geotextiles.

中文翻译：

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基于低场核磁共振技术的非织造土工布特征孔径


评估非织造土工布孔隙特性的传统方法受到一些限制的困扰，例如准确性低和加工时间长。因此，本文提出了低场核磁共振 （NMR） 技术来获取非织造土工布的孔径分布 （PSD） 曲线、孔隙率和特征孔径 （CPS）。真空饱和样品的 T2 特征谱是通过低场 NMR 测试获得的，而孔形系数和表面弛豫速率是通过扫描电子显微镜 （SEM） 和 X 射线计算机断层扫描 （CT） 三维 （3D） 重建技术确定的。获取 PSD 曲线和 CPS （O90） 值，并与湿筛、干筛和 CT 数字图像方法的结果进行比较。结果表明，低场 NMR 技术可以准确有效地测定非织造土工布的 CPS。