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Bitumen for paving applications

21/05/2014 11:24

Leiths chose Nynas Nypol 103

A stretch of the A90 in Scotland now has an innovative thin layer wearing course featuring PMB.

A new Scottish specification for stone mastic asphalt could help with some of the durability issues sometimes experienced in the UK

An alternative specification for stone mastic asphalt has been used on the A90 in Scotland, with tests suggesting that the material will be more durable than thin surfacing produced under the standard UK specification, Clause 942 of the Specification for Highway works.

Leiths offered an alternative, a material that would meet all of the contract requirements Plus also meet TS 2010. “It was decided to proceed with two SMA mixes, a 10mm and a 6mm using local granite aggregates of PSV56, laid to a target thickness of 35mm,” Neil Anderson, technical director of Leiths Group, says. For the polymer modified bitumen Leiths used Nynas Nypol 103, a highly modified elastomeric binder which demonstrates substantial resistance to deformation and cracking.

Read the entire article in World Highways

Further reading

Better roads = improved competitiveness

The upgrading and maintenance of road networks are effective tools for countries wishing to improve their competitiveness. Roberto Crotti from the World Economic Forum explains why.

Read more about Better roads = improved competitiveness

Keeping cool when it’s needed

Bitumen is handled at elevated temperatures. There are many important precautions that need to be taken to minimise the risk of burn injuries.

Read more about Keeping cool when it’s needed

Rheology rethink

A proposed new method for studying the rheology of bitumen and binders at low temperatures proves promising. Hilde Soenen explains the method’s potential.

Read more about Rheology rethink