Abstract
Rubber powder formed from discarded tire rubber is mixed with red clay to form a rubber‐red clay mixture. The dynamic triaxial test was carried out on the mixtures under different conditions. The effects of rubber content, rubber particle size, moisture content of mixed soil, compactness, confining pressure, and vibration frequency on shear strain relation, dynamic shear modulus, and damping ratio of the mixture were investigated. The results show that under the same dynamic strain, the dynamic shear stress‐strain curve of rubber mixed soil decreases with the increase in rubber particle content and moisture content and decrease in rubber particle size. On the other hand, it increases with the increase in compactness, confining pressure, and vibration frequency, and as the dynamic strain increases, the τd‐γd curve becomes more nonlinear. In addition, with the increase in the rubber particle content, the dynamic shear modulus decreased while the damping ratio increased. When the content was 2%, the change was fastest. After continued addition, it gradually became stable, and when the decrease in rubber particle size also shows the same pattern, 2.00 mm rubber‐red clay mixture shows better structure. The water content has great influence on dynamic shear modulus and damping ratio of rubber‐red clay mixtures. With the increase in compactness, confining pressure, and vibration frequency, the interaction between mixed soil particles was enhanced, the dynamic shear modulus increased, and the damping ratio decreased.
Highlights
How to deal with the black pollution caused by waste tires is a big problem that plagues the engineering community
It was found that when the amount of rubber powder was less than 20%, the compaction characteristics of the mixed soil were similar to that of loess, and while the amount is greater than 40%, the compaction characteristics were similar to noncohesive soils. e relationship between the maximum dry density and optimum water content could be expressed by power function
Feng et al [16,17,18,19] studied the influence of rubber powder content on the dynamic shear modulus and damping ratio of rubber-sand mixture under different
Summary
How to deal with the black pollution caused by waste tires is a big problem that plagues the engineering community. Feng et al [16,17,18,19] studied the influence of rubber powder content on the dynamic shear modulus and damping ratio of rubber-sand mixture under different. Kermani et al [20] studied the dynamic shear modulus and damping ratio of rubber-sand mixture with different rubber content and different confining pressures through cyclic triaxial tests and proposed the normalization equation between the dynamic shear modulus and dynamic strain. Li et al [23] studied the dynamic strength, dynamic modulus, and damping ratio of rubber-sand mixtures with different powder contents by dynamic triaxial tests. The dynamic shear stress-shear strain, dynamic shear modulus, and damping ratio of rubber-red clay mixtures under different factors such as powder content, particle size, compaction, and moisture content have been studied through indoor dynamic triaxial tests. A constitutive model suitable for dynamic shear modulus, damping ratio, and shear strain of rubber-red clay is proposed. e research results have certain academic and application value and provide a new idea for the reuse of waste tires
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