Recycled waste tires when mixed with soil can play an important role as lightweight materials in retaining walls and embankments, machine foundations and railroad track beds in seismic zones. Having high damping characteristic, rubbers can be used as either soil alternative or mixed with soil to reduce vibration when seismic loads are of great concern. Therefore, the objective of this work was to evaluate the dynamic properties of such mixtures prior to practical applications. To this reason, torsional resonant column and dynamic triaxial experiments were carried out and the effect of the important parameters like rubber content and ratio of mean grain size of rubber solids versus soil solids (D 50,r /D 50,s ) on dynamic response of mixtures in a range of low to high shearing strain amplitude from about 4×10 −4 % to 2.7% were investigated. Considering engineering applications, specimens were prepared almost at the maximum dry density and optimum moisture content to model a mixture layer above the ground water table and in low precipitation region. The results show that tire inclusion significantly reduces the shear modulus and increases the damping ratio of the mixtures. Also decrease in D 50,r /D 50,s causes the mixture to exhibit more rubber-like behavior. Finally, normalized shear modulus versus shearing strain amplitude curve was proposed for engineering practice.
Abstract. Waste tires are extensively being used in civil engineering applications to improve exibility and elastic properties of the base foundation material. Moreover, by using pure tires or soil-tire mixtures, rubber stockpiles, which cause lots of environmental contaminations, are being consumed. The objective of this research is to study the strength and elastic modulus variations of sands when combined with rubber materials in di erent sizes and percentages. Triaxial experiments were performed on various sand-rubber mixtures using static triaxial apparatus. Samples were constructed at the maximum dry density and optimum moisture content to consider engineering applications in dry regions. The results show that rubber content and rubber-sand particle size ratio, D 50;r =D 50;s , signi cantly a ect the mixture behavior in the manner which increase in the former and decrease in the latter, leading to a more softening behavior. Furthermore, speci c combination of sand and rubber, which may improve the elastic properties of the mixture, is proposed as a exible base layer.
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