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首页> 外文期刊>Journal of materials in civil engineering >Freeze-Thaw Durability of Cement-Stabilized Soil Reinforced with Polypropylene/Basalt Fibers
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Freeze-Thaw Durability of Cement-Stabilized Soil Reinforced with Polypropylene/Basalt Fibers

机译：用聚丙烯/玄武岩纤维加固水泥稳定土壤的冻融耐久性

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摘要

Many studies have been carried out on the influence of freeze-thaw cycles on the mechanical behavior of cement- or lime-stabilized soils. However, very limited studies have considered the effects of freeze-thaw cycles on cement-stabilized soil reinforced with fibers. The main objective of this study is to determine the effects of polypropylene fiber (PPF) and basalt fiber (BF) content (0%, 0.5%, 1 %, 2%, and 5%), cement content (0%, 3%, and 9%), number of freeze-thaw cycles (0, 2, 4, 8, and 10), and initial moisture content on the unconfined compressive strength (UCS) of clay soil. The study reveals that adding cement, PPF, or BF to soil causes a remarkable increase in strength, where the strength of the PPF-reinforced specimens is significantly more than that of BF-reinforced ones. The UCS values of the specimens compacted at optimum moisture content (OMC) are almost more than those that were prepared at a molding moisture content of 0.8 OMC or 1.2 OMC. The strength of specimens increases with increases in cement content and curing time. However, the axial strain at failure for cement-stabilized specimens decreased with increasing cement content or curing time. Furthermore, it is concluded that the increase in the UCS of combined PPF or BF with cement inclusion is more than that caused by each fiber without cement. A regression model is developed to predict the UCS in terms of four effective agents for each case of stabilization by BF or PPF. Results indicate a satisfactory performance of the model where the Pearson correlation coefficient above 0.95 for UCS prediction is obtained.
机译：已经对冻融循环对水泥或石灰稳定土壤的力学行为的影响进行了许多研究。然而，非常有限的研究考虑了冻融循环对用纤维增强的水泥稳定的土壤的影响。本研究的主要目的是确定聚丙烯纤维（PPF）和玄武岩纤维（BF）含量的影响（0％，0.5％，1％，2％和5％），水泥含量（0％，3％和9％），冻融循环（0,2,4,8和10）的数量，以及粘土土壤的非整合压缩强度（UC）的初始水分含量。该研究表明，加入水泥，PPF或BF到土壤导致强度显着增加，PPF加强标本的强度显着大于BF加固型的强度。在最佳水分含量（OMC）下压实的样品的UCS值几乎大于0.8MOC或1.2MOC的模塑水分含量的那些。样品的强度随着水泥含量的增加和固化时间增加。然而，水泥稳定样品失败的轴向菌株随着水泥含量的增加或固化时间而降低。此外，得出结论是，使用水泥包含的PPF或BF组合的UCS的增加大于由每根纤维没有水泥引起的。开发回归模型以根据BF或PPF稳定的每种有效剂来预测UCS。结果表示获得UCS预测0.95高于0.95的Pearson相关系数的模型的令人满意的性能。

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