1. Effect of rubber granules and rubber threads on mechanical properties of cement-bound base course.
- Author
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Zvonarić, Matija, Barišić, Ivana, and Dokšanović, Tihomir
- Subjects
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ULTRASONIC testing , *RUBBER , *RUBBER waste , *DIGITAL image correlation , *SCANNING electron microscopes , *ROAD construction - Abstract
The study investigates the application of waste rubber in cement-stabilized base course (CBC), aiming to address internal stresses, reflective cracks, and waste disposal issues. Mixtures of gravel and sand stabilized with varying cement and rubber content were examined, including reference mixtures and those with granulated rubber or rubber threads, a total of 17 mixtures. Mechanical properties, durability, and environmental impact were evaluated through standard tests such as Proctor elements, compressive and tensile strengths, freeze thaw resistance, shrinkage, and scanning electron microscope analysis. Non-standard, non-contact methods like ultrasonic pulse velocity and 3D digital image correlation were employed. Results indicate the feasibility of using waste rubber in CBC, with the optimal mixture containing 5 % cement and 20 % rubber as a replacement for sand showing satisfactory compressive strength (3.01 MPa) for application as a base layer, reduced stiffness, improved frost resistance (9.76 %), improved tensile to compressive strength ratio (52.99 %), and increased resistance to reflective cracking comparing to reference mixture. Moreover, it exhibited minimal shrinkage compared to other mixtures. The study underscores the importance of assessing environmental acceptability in waste materials for road construction, emphasizing the need for further research. Furthermore, the possibility of employing non-contact testing methods has been demonstrated. [Display omitted] • The optimal composition of rubberized CBC has been defined. • Rubber improves freeze – thaw resistance of CBC. • Rubber decreases the shrinkage of CBC. • The use of rubber in CBC does not pose an environmental risk. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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