Fode Tsion Amsalu, Jande Yusufu Abeid Chande, Kim Young-Deuk, Ham Min-Gyu, Lee Jieun, Kivevele Thomas, Rahbar Nima
School of Materials, Energy, Water and Environmental Sciences (MEWES), The Nelson Mandela African Institution of Science and Technology, P.O. Box 447, Arusha, Tanzania.
Structural Material and Engineering Research Group, The Nelson Mandela African Institution of Science and Technology, Postal Box 447, Arusha, Tanzania.
Sci Rep. 2025 Jan 10;15(1):1603. doi: 10.1038/s41598-025-86046-3.
Sisal fiber moisture sensitivity and degradation are treated by alkaline and pozzolanic methods, such as silica fume and kaolin surface coating. However, it is novel that the treatment of sisal fiber by calcined bentonite slurry can coat sisal fiber from moisture and protect it from cement hydration by consuming free lime and reducing cement matrix alkalinity. Therefore, the present study treated sisal fibers with calcined bentonite slurry and investigated the effect of using different lengths and doses of treated and raw sisal fibers in a mortar. The results indicate that the treatment of sisal fiber with bentonite slurry improved the roughness of the fiber, reduced fresh bulk density, improved resistance in acid, salt, and alkaline conditions, and increased compressive and flexural strength at 28 and 56 days compared to the control mixture and raw sisal fiber-employed mortar. Therefore, TS1L10 improved compressive strength by 30.62% and 1.8% at 28 and 56 days, respectively. Also, TS1L10 enhanced strength and residual strength in 5% HCl by 54.54% and 72.25%, respectively, compared to the control mixture at 56 days. Generally, the present study revealed the importance of calcined bentonite-treated sisal fibers in a mortar mixture for improved durability, physical and mechanical properties.
剑麻纤维的湿度敏感性和降解可通过碱性和火山灰质方法处理，如硅灰石和高岭土表面涂层。然而，用煅烧膨润土浆液处理剑麻纤维是新颖的，它可以使剑麻纤维防潮，并通过消耗游离石灰和降低水泥基体碱度来保护其免受水泥水化的影响。因此，本研究用煅烧膨润土浆液处理剑麻纤维，并研究了在砂浆中使用不同长度和剂量的处理过的剑麻纤维和未处理的剑麻纤维的效果。结果表明，与对照混合物和使用未处理剑麻纤维的砂浆相比，用膨润土浆液处理剑麻纤维提高了纤维的粗糙度，降低了新拌堆积密度，提高了在酸、盐和碱性条件下的抗性，并提高了28天和56天的抗压强度和抗折强度。因此，TS1L10在28天和56天时分别提高了抗压强度30.62%和1.8%。此外，与56天时的对照混合物相比，TS1L10在5%盐酸中的强度和残余强度分别提高了54.54%和72.25%。总体而言，本研究揭示了煅烧膨润土处理的剑麻纤维在砂浆混合物中对于提高耐久性、物理和力学性能的重要性。
