Influence of Adding Tire Chips on the Mechanical Behavior of Calcareous Sands
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ORIGINAL PAPER
Influence of Adding Tire Chips on the Mechanical Behavior of Calcareous Sands Hasan Eshghinezhad
. Nader Shariatmadari . Behnam Askari Lasaki
Received: 12 September 2018 / Accepted: 20 October 2020 Springer Nature Switzerland AG 2020
Abstract Scrap Tire disposal has been a critical environmental problem in many urban cities due to the enormous boost in the number of vehicles. This problem can be somehow mitigated by finding applications for these unusable materials in engineering. For instance, Scrap Tire can be executed as lightweight materials for backfill in geotechnical engineering projects. The Scrap Tire reuse in Sand-Tire Mixtures can effectively address growing environmental concerns and, at the same time, provide solutions for geotechnical problems associated with the low shear strength of the soil which fundamentally is determined as the main characteristics of Calcareous (or Carbonate) soils. In order to deeply understand the mechanical behavior of Sand-Tire Mixtures, a series of Consolidated Drained Triaxial Test were conducted in this study employing specimens with two different relative densities (i.e. 30% and 60%) under the specific confining pressures (i.e.100, 350, and 600 kN/m2). The results revealed that by adding 10% Scrap Tire H. Eshghinezhad (&) N. Shariatmadari Department of Civil Engineering, Iran University of Science and Technology, 16846-13114 Tehran, Iran e-mail: [email protected] N. Shariatmadari e-mail: [email protected] B. Askari Lasaki School of Civil Engineering, University of Mohaghegh Ardabili, Ardabil, Iran e-mail: [email protected]
into the Sand-Tire Mixtures, the loose specimen’s shear strength increases from 6 to 14% in comparison to pure sand. Furthermore, the particle breakage factor of the mixtures is considerably less than that of pure specimens. Keywords Calcareous sand Tire chips Triaxial test Particle breakage Relative density Abbreviations CS Calcareous sand Gs Specific gravity of sand TC Tire chips R Tires chips in mixtures by Volume PB Particle breakage Cu Coefficient of uniformity S-TC Sand-tire chips Cc Coefficient of curvature CS-TC Calcareous sand-tire chips u Internal friction angle Dr Relative density ueq Equivalent internal friction angle cd Mixture dry unit weight c Cohesion cd min Minimum dry unit weight r Confining pressures cd max Maximum dry unit weight cDr=30% Mixture dry unit weight at Dr = 30% cm Matrix unit weight cDr=60% Mixture dry unit weight at Dr = 60%
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Geotech Geol Eng
Ws Br Vm Bt Vt Bp Gt B-value
Soil mass Relative breakage Mold volume Total breakage Tire chips volume Breakage potential Specific gravity of tires Degree of saturation
1 Introduction Calcareous sediments are located in temperate and tropical areas and cover approximately 40% of the ocean surface (Holmes 1945). These soils are made up of the rest of the body of marine creatures, particularly tiny cowries or with a physical or chemical origin. Former practical exper
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