Recycled tires as coarse aggregate in concrete pavement mixtures.
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Recycled tires as coarse aggregate in concrete pavement mixtures.

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      The reuse potential of tire chips as coarse aggregates in pavement concrete was examined in this research by investigating the effects of low- and high-volume tire chips on fresh and hardened concrete properties. One concrete control mixture was designed, which well exceeds CDOT Class P concrete requirements. The coarse aggregate component of the mixture was replaced in 100%, 50%, 30%, 20%, and 10% by volume using tire chips. The fresh concrete properties, compressive strength, flexural strength, splitting strength, permeability, and freeze/thaw durability were tested in the lab to evaluate the potential of including tire chips in concrete paving mixes. The testing results indicate tire chips can be used to replace coarse aggregate in concrete pavement mixtures. Two mixtures with 10% coarse aggregate replaced by tire chips had the best performance. The workability was comparable to the control mixture, and the air content reached 6%. At 28 days of age, the average compressive strength of the two mixtures was significantly less than the control but still exceeded CDOT’s specification of 4200 psi; the averaged flexural and splitting tensile strengths were higher than 900 psi and 590 psi respectively. In addition, the two mixtures exhibited moderate resistance to chloride-ion penetration at 28 days of age and high freeze/thaw durability. The rubberized mixtures investigated in this study sustained a much higher deformation than the control mixture when subjected to compressive, flexural, and splitting loadings.
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