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Strength Characteristics of Clay-Rubber Waste Mixtures in UU Triaxial Tests

机译：UU三轴试验中粘土-橡胶废料混合物的强度特性

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This paper presents results of undrained and unconsolidated (UU) triaxial tests related to the influence of tire waste addition on strength characteristics of red clay from Patoka in Southern Poland. Angle of internal friction and cohesion values were estimated for 30 specimens prepared from pure red clay (RC), its mixtures with two different fractions of shredded rubber in 5%, 10%, and 25% mass proportions as well as for pure powder (P) and granulate (G). It has been observed that the addition of granulate contributes more to the increase in the angle of friction than the addition of powder (ΔΦ uu = +1% (G-5) / +16% (G-10) / +31% (G-25), ΔΦ uu = +1% (P-5) / +10% (P-10) / +19% (P-25)). On the other hand, rubber additions reduce cohesion in mixtures, and the effect is enhanced with increases in their grain size and percentage composition (Δc uu = ?31% (G-5) / ?63% (G-10) / ?87% (G-25), Δc uu = ?67% (P-5) / ?58% (P-10) / ?58% (P-25)). It has been noticed that a change of parameters Φ uu and c uu causes a decline of shear stresses at increasing granulate content. There is an inverse relationship for powder. At the same time, it has been shown that the failure strain, hence a change in red clay-rubber (RCR) mixtures plasticity, is related to the level of confining stress σ 3 and the type of rubber waste. Results of tests and their comparison with results of other researchers show that each time it is necessary to experimentally verify a given soil with specific rubber waste.
机译：本文介绍了不排水和不固结（UU）三轴测试的结果，这些测试与添加轮胎废料对波兰南部帕托卡（Patoka）红粘土的强度特性的影响有关。估算了30个由纯红粘土（RC）制备的试样的内部摩擦角和内聚力值，该试样与两种不同比例的切碎橡胶以5％，10％和25％的质量比混合而成的混合物以及纯粉（P ）并造粒（G）。已经观察到，与添加粉末相比，添加颗粒更有助于增加摩擦角（ΔΦuu = + 1％（G-5）/ + 16％（G-10）/ + 31％（ G-25），ΔΦuu = + 1％（P-5）/ + 10％（P-10）/ + 19％（P-25））。另一方面，添加橡胶会降低混合物的内聚力，并且随着其晶粒尺寸和组成百分比的增加，其效果会增强（Δcuu = 31％（G-5）/ 63％（G-10）/ 87％ ％（G-25），Δcuu ＝Δ67％（P-5）/Δ58％（P-10）/Δ58％（P-25））。已经注意到，随着颗粒含量的增加，参数Φuu和cu u的变化引起剪切应力的下降。粉末有反比关系。同时，已经表明，破坏应变，即红粘土-橡胶（RCR）混合物可塑性的变化，与围压σ3的水平和橡胶废料的类型有关。测试结果以及与其他研究人员的比较结果表明，每次有必要通过实验来验证特定橡胶废料对给定土壤的影响。

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