Resolving contradictory mechanical performance of untreated tire rubberized concrete: A mechanism-based review by Joshua Liyungu et al.

By Joshua

More than 800 million end-of-life tires are generated annually, motivating the use of untreated tire rubber aggregates in concrete as a resource-efficient material. Thus, this review integrates more than three decades of experimental and numerical evidence on the mechanical, thermal, interfacial, and durability performance of tire-rubberized concrete. In general, higher rubber contents reduce compressive strength, stiffness, reinforcement bond, shear capacity, and thermal conductivity, but improve deformability and energy dissipation. These responses depend not only on nominal replacement level, but also on rubber density, particle morphology, dosage basis, water-to-cement ratio, processing conditions, and specimen geometry. Findings remain inconsistent regarding particle-size effects, carbonation resistance, shrinkage, energy absorption, and long-term deterioration. Statistical analysis of 137 strength-reduction records and 79 tensile records, supported by bootstrap confidence intervals, residual diagnostics, and repeated hold-out validation, showed........

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