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100% Recycled Mixtures Using Hot In-Place Recycling (HIR) and Cold In-Place Recycling (CIR)
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2022-05-01
[PDF-4.64 MB]
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Alternative Title:100% Recycled Mixtures Using Cold In-Place Recycling (CIR), Hot In-Place Recycling (HIR) and Cold Central Plant Recycling (CCPR) [Title from Cover]
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Edition:Final Report December 2019 – May 2022
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Abstract:The increasing costs of asphalt binder and aggregates have put much pressure on the highway maintenance budgets. Pavement managers are seeking alternative cost-effective approaches to rehabilitate the roads. In-place recycling techniques, including hot in-place recycling (HIR) and cold in-place recycling (CIR), encouraged consuming 100% RAP from the existing pavement, which allowed the utilization of suitable recycling agents to rejuvenate the aged asphalt. However, the cost-effectiveness and blending mechanisms of using these techniques remained concerns. In this research project, the UT research teams aimed to conduct a comprehensive evaluation of using the in-place recycling techniques, investigate the blending mechanisms and recycling efficiency of using HIR techniques, and provide useful recommendations to TDOT for further constructions. Results showed that HIR and CIR techniques were suitable for low-volume roads, which could save 20.1% and 15.9% cost in the whole life cycle, respectively. Pavement with in-place recycling techniques tended to encounter severe cracking issues. For CIR, an adequate curing period and appropriate cement usages could improve the cracking resistance, moisture resistance, and stiffness of the CIR mixes. For HIR, the mobilized RAP content ranged from 20% to 30%, contributing to a change of effective binder quality and an increase in the effective asphalt content. The binder quality significantly influenced the stiffness of the HIR mixes, while the effective asphalt content determined the cracking resistance of HIR mixes. An appropriate heating temperature and adequate of using recycling agent could improve the cracking resistance of the HIR mixes.
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