Abstract
Waste automobile tires are used as additives or replacements instead of traditional materials in civil engineering works. In geotechnical engineering, tires are shredded to certain sizes and mixed with soil, especially used as backfill material behind retaining walls or fill material for roadway embankments. Compared to soil, rubber has high damping capacity and low shear modulus. Therefore, it requires the determination of the dynamic characteristics of rubber/soil mixtures. In this paper, the cyclic behavior of recycled tire rubber and clean sand was studied, considering the effects of the amount and particle size of the rubber and confining stresses. A total of 40 stress-controlled tests were performed on an integrated resonant column and dynamic torsional shear system. The effects of the relative size and proportion of the rubber on the dynamic characteristics of the mixtures are discussed. The dynamic properties, such as the maximum shear modulus, strain-dependent shear modulus, and damping ratio, are examined. For practical purposes, simple empirical relationships were formulated to estimate the maximum shear modulus and the damping ratio. The change in the shear modulus and damping ratio with respect to shear strain with 5% of rubber within the mixture was found to be close to the behavior of clean sand.
Highlights
IntroductionThe use of automobile tire waste has gained wide popularity in various applications in the last three decades
In civil engineering practice, the use of automobile tire waste has gained wide popularity in various applications in the last three decades
Waste tires have been used as asphalt binder modifiers and asphalt mixture additives in gap-graded or open-graded asphalt mixtures and surface treatments
Summary
The use of automobile tire waste has gained wide popularity in various applications in the last three decades. It is used as additives or replacements for conventional materials in construction work. Regulations such as ASTM D6720-98 have standardized the use of waste tire for the classification [1]. Standardization of waste tire is done according to the disintegration method and the size of the disintegrated product during the recycling process. Waste automobile tires are generally cut up into small pieces of different sizes and mixed with structural materials in some predetermined proportions in order to achieve the desired engineering properties. It has been reported that adding recycled tire to asphalt provides increased rutting resistance, friction resistance, ride quality, extended pavement life, and reduced noise and vibration levels [2, 3]
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