Pavement Recycling Project Creates Great Savings
Pavement recycling is saving the Virginia Department of Transportation, USA time and money as it rehabilitates aging roadways.
The agency rebuilt a section of Interstate 81 in Augusta County by recycling existing road material and using it in the new pavement structure. Using this paving method cut construction time by about two–thirds and saved millions of dollars on the project, earning the transportation agency a national award from the asphalt recycling industry.
The I–81 project marked the first time cold in–place recycling, cold central–plant recycling and full–depth reclamation were used together on an interstate project in the USA, although other states have used the techniques separately.
The $7.6 million project took about eight months for the contractor to complete. Using conventional pavement construction this would have cost about $40 million, the Virginia Department of Transport (DOT) estimated, and taken about two years. On this stretch of I–81, the right lane required full–depth reclamation; from the asphalt driving surface down through the foundation. The asphalt layer under the driving surface was restored using cold central–plant recycling, in which stockpiled milled asphalt from the road was processed in an on–site mobile plant for reuse under a new hot–mix asphalt overlay. Stabilisation of the soils below using lime was carried out to ensure stability of the soil prior to the in-situ recycling process.
"Savings on the I–81 in–place pavement recycling project go beyond time, money and materials," said Virginia DOT Commissioner Greg Whirley. "It saved fuel because it reduced the need to transport as much new and old materials. It increased safety for drivers and road workers on the project because it reduced work zone congestion. This section of rebuilt pavement also will be stronger from bottom to top, extending its service life and reducing the need for such complex maintenance for many years." For the project, the Virginia DOT won the 2012 Recycling Award in the Cold In–Place Category from the Asphalt Recycling & Reclaiming Association and Roads & Bridges magazine. Winners were selected based on the amount of recycled pavement materials used, cost savings and project challenges.
Notes to Editors
The BLA is a constituent body of the Mineral Products Association (MPA), which is the trade association for the aggregates, asphalt, cement, concrete, lime, mortar and silica sand industries. The BLA represents the interests of three member companies, responsible for producing 75% of the lime sold in the UK. The BLA members are Lhoist UK, Singleton Birch Ltd and Tarmac.
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