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首页> 外文期刊>Ground improvement >Effect of material properties on the behaviour of sand-cement-fibre composites
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Effect of material properties on the behaviour of sand-cement-fibre composites

机译：材料性能对砂水泥纤维复合材料性能的影响

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Saturated drained triaxial compression tests with local strain measurement were carried out to evaluate the effects of using three different randomly distributed fibres (polyester, polypropylene and glass fibres) and rapid hardening Portland cement to improve the engineering behaviour of a uniform fine sand. In addition to the nature of the fibres, also analysed have been the separate and combined effect of fibre content (up to 0.5% by weight), fibre length (up to 36mm), cement content (from 0% to 7% by weight) and initial mean effective stress (20, 60 and 100 kN/m~2) on the deformation and strength characteristics of the soil. The present work searches for the establishment of a relation between the properties of the fibres and the mechanical behaviour of the composite material, originated from their combination with soil and cement. The cementation itself notably increased modulus, peak cohesive intercept, peak friction angle and brittleness of the sand. Inclusion of polyester and glass fibres (both relatively stiff) slightly reduced the stiffness and increased the peak friction angle of both the cemented and uncemented sand, and also slightly reduced the peak cohesive intercept and brittle-ness of the cemented composite. On the other hand, relatively flexible polypropylene fibre reinforcement dramatically reduced the brittleness (changing the mode of failure of the cemented sand from brittle to ductile for longer fibres) and stiffness, while increasing the ultimate strength of the cemented composite.
机译：进行了带有局部应变测量的饱和排水三轴压缩试验，以评估使用三种不同的随机分布的纤维（聚酯纤维，聚丙烯纤维和玻璃纤维）和快速硬化的硅酸盐水泥来改善均匀细砂的工程性能的效果。除了纤维的性质外，还分析了纤维含量（最高0.5％重量），纤维长度（最高36mm），水泥含量（0％至7％重量）的单独和综合作用。初始平均有效应力（20、60和100 kN / m〜2）对土壤的变形和强度特性的影响。本工作寻求在纤维的性能与复合材料的机械性能之间建立关系，这种关系源于其与土壤和水泥的结合。固结本身显着增加了模量，峰值内聚力拦截，峰值摩擦角和沙子的脆性。包含聚酯纤维和玻璃纤维（都比较坚硬）会稍微降低刚度并增加胶结和未胶结砂的峰值摩擦角，并且还会略微降低胶结复合材料的峰值内聚力和脆性。另一方面，相对柔软的聚丙烯纤维增强材料极大地降低了脆性（将胶结砂的破坏模式从脆性变为韧性，以延长纤维）和刚度，同时增加了胶结复合材料的极限强度。

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