Lazorenko Georgy, Kasprzhitskii Anton, Mischinenko Vasilii, Fedotov Alexandr, Kravchenko Ekaterina
Climate Center, Novosibirsk State University, Pirogov Street, 2, Novosibirsk 630090, Russia.
Technological Faculty, Platov South-Russian State Polytechnic University, Prosveshcheniya St., 132, Novocherkassk 346428, Russia.
Materials (Basel). 2024 Nov 20;17(22):5659. doi: 10.3390/ma17225659.
Expansive soils, prone to significant volume changes with moisture fluctuations, challenge engineering infrastructure due to their swelling and shrinking. Traditional stabilization methods, including mechanical and chemical treatments, often have high material and environmental costs. This study explores fibrous by-products of flax processing, a sustainable alternative, for reinforcing expansive clay soil. Derived from the Linum usitatissimum plant, flax fibers offer favorable mechanical properties and environmental benefits. The research evaluates the impact of flax tow (FT) reinforcement on enhancing soil strength and reducing cracking. The results reveal that incorporating up to 0.6% randomly distributed FTs, consisting of technical flax fibers and shives, significantly improves soil properties. The unconfined compressive strength (UCS) increased by 29%, with 0.6% FT content, reaching 525 kPa, compared to unreinforced soil and further flax tow additions, which led to a decrease in UCS. This reduction is attributed to diminished soil-fiber interactions and increased fiber clustering. Additionally, flax tows effectively reduce soil cracking. The crack length density (CLD) decreased by 6% with 0.4% FTs, and higher concentrations led to increased cracking. The crack index factor (CIF) decreased by 71% with 0.4% flax tows but increased with higher FT concentrations. Flax tows enhance soil strength and reduce cracking while maintaining economic and environmental efficiency, offering a viable solution for stabilizing expansive clays in geotechnical applications.
膨胀土容易随着水分波动而发生显著的体积变化，因其膨胀和收缩特性对工程基础设施构成挑战。包括机械和化学处理在内的传统稳定方法，往往具有高昂的材料和环境成本。本研究探索亚麻加工过程中的纤维副产品这种可持续的替代物，用于增强膨胀性黏土。亚麻纤维源自亚麻植物，具有良好的力学性能和环境效益。该研究评估了亚麻束（FT）增强对提高土壤强度和减少开裂的影响。结果表明，掺入高达0.6%由工业亚麻纤维和木片组成的随机分布的FTs，能显著改善土壤性能。与未增强土壤及进一步增加亚麻束添加量相比，FT含量为0.6%时，无侧限抗压强度（UCS）提高了29%，达到525kPa，而进一步增加亚麻束添加量会导致UCS下降。这种下降归因于土壤与纤维间相互作用减弱以及纤维团聚增加。此外，亚麻束能有效减少土壤开裂。FT含量为0.4%时，裂纹长度密度（CLD）降低了6%，而更高浓度会导致开裂增加。FT含量为0.4%时，裂纹指数因子（CIF）降低了71%，但随着FT浓度升高而增加。亚麻束在保持经济和环境效益的同时，增强了土壤强度并减少了开裂，为岩土工程应用中稳定膨胀黏土提供了一种可行的解决方案。
