What are the emerging trends and innovations in pavement recycling?

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Pavement recycling is a sustainable and cost-effective way to reuse existing materials and reduce waste and greenhouse gas emissions. It involves removing, processing, and reapplying the old pavement layers as new ones, either in place or at a plant. In this article, you will learn about some of the emerging trends and innovations in pavement recycling, and how they can improve the performance and durability of your pavement projects.

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Jose Antonio Marinho Pontes Jr

Engenheiro civil de Obras de Artes Especiais com habilidades em Geotecnia,pavimenta??o e supervis?o de obras

1 Cold in-place recycling

Cold in-place recycling (CIR) is a method of pavement recycling that involves milling the old asphalt surface, mixing it with a recycling agent and water, and laying it back as a new base layer. CIR can save energy, materials, and money, as well as reduce traffic disruption and noise. One of the innovations in CIR is the use of foamed asphalt, which is produced by injecting hot asphalt with cold water and air. Foamed asphalt can improve the workability, strength, and moisture resistance of the recycled mix.

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Jose Antonio Marinho Pontes Jr

Engenheiro civil de Obras de Artes Especiais com habilidades em Geotecnia,pavimenta??o e supervis?o de obras
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Um método de restaura??o de pavimentos bastante utilizado na malha rodoviária no Brasil, é a reciclagem de pavimento a frio. Ela é muito vantajosa, pois o destino final do material betuminoso fresado a ser incorporado na camada de base existente, adicionado de material pétreo e água, tendo um aumento da capacidade de suporte da base , bem como eleva??o do seu módulo de resiliência e apartir daí execu??o da nova camada betuminosa. Esse servi?o é normatizado pela norma DNIT 166/2013, com seu devido controle tecnológico a fim de verificar a qualidade do servi?o executado.

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Mahdi Ghasemi

Highways Engineer | Road Pavement Treatment Solutions and Infrastructure Asset Management | +12 Years of Experience in Highway Inspection, Surface Maintenance, and Rehabilitation Projects
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Asphalt pavement is the most widely used high-grade form of pavement in road construction. Due to its excellent mechanical properties, anti-slip performance, convenient construction, good economic durability, and ease of recycling, it is widely used in the construction of urban roads, highways, airport runways, and other roads. However, asphalt pavement also has some drawbacks, such as poor durability and high maintenance costs, which require corresponding maintenance measures to be taken. Firstly, due to the inherent temperature sensitivity of asphalt materials, they are prone to softening and deformation at high temperatures and brittle cracking at low temperatures, which can lead to a decrease in the bearing capacity of the road surface

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2 Hot in-place recycling

Hot in-place recycling (HIR) is another method of pavement recycling that involves heating the old asphalt surface, scarifying it, adding new asphalt or rejuvenator, and compacting it as a new surface layer. HIR can restore the smoothness, skid resistance, and crack resistance of the pavement, as well as extend its service life. One of the innovations in HIR is the use of infrared heating, which can heat the pavement more evenly and efficiently, and reduce the risk of burning or overheating the asphalt.

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3 Full-depth reclamation

Full-depth reclamation (FDR) is a method of pavement recycling that involves pulverizing the entire pavement structure, including the asphalt, base, and subbase layers, and stabilizing it with cement, lime, fly ash, or asphalt emulsion. FDR can enhance the strength, stiffness, and drainage of the pavement, as well as reduce the need for new materials and hauling. One of the innovations in FDR is the use of intelligent compaction, which is a technology that measures and controls the compaction effort and quality in real time, and provides feedback to the operator and the engineer.

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4 Recycled concrete aggregate

Recycled concrete aggregate (RCA) is a product of crushing and screening old concrete pavement, and using it as a substitute for natural aggregate in new concrete or asphalt mixtures. RCA can conserve natural resources, reduce landfill space, and lower transportation costs. One of the innovations in RCA is the use of carbonation, which is a process that exposes the RCA to carbon dioxide and water, and converts the calcium hydroxide in the cement paste to calcium carbonate. Carbonation can improve the durability, shrinkage, and alkali-silica reaction resistance of the RCA.

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5 Rubberized asphalt

Rubberized asphalt is a type of asphalt mixture that incorporates crumb rubber from scrap tires, either as a modifier in the binder or as a partial replacement for the aggregate. Rubberized asphalt can improve the elasticity, fatigue resistance, and rutting resistance of the pavement, as well as reduce noise and tire wear. One of the innovations in rubberized asphalt is the use of microwave technology, which can activate the rubber particles and enhance their adhesion to the asphalt binder.

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Jhosdado(Jhos) Romero, Eng.

MS Student in Civil Engineering ????????
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The asphalt rubber gap-graded (ARGG) mix is a gap-graded asphalt mixture that uses aggregate with a top size of either ? inch or ? inch, as well as an asphalt-rubber binder containing approximately 20 percent ground tire rubber. Plus, some guidelines restrict Rubberized Hot Mix Asphalt-gap Graded (RHMA-G) to surface layers due to cost and rutting concerns. However, recent advancements have mitigated these issues, making RHMA-G cost-competitive with conventional mixes and improving rutting performance.

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What are the emerging trends and innovations in pavement recycling?

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1 Cold in-place recycling

2 Hot in-place recycling

3 Full-depth reclamation

4 Recycled concrete aggregate

5 Rubberized asphalt

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