Aggregate Industries lightens the load for the Acton Swing Bridge

Aggregates Industries recently lightened the load for the 73m-long bow string truss Acton Swing Bridge in England. When opened in 1933, it was the first floating swing bridge in the UK – floating on a pontoon. The 84-year-old bridge, which is cared for by the Canal & River Trust charity, carries the busy A49 road over the River Weaver Navigation, in the county of Cheshire. A recent €1.7 million complete refurbishment included strengthening works to the underside of the bridge as well as improvements to its
October 2, 2018 Read time: 3 mins
Work in full swing on the Acton Swing Bridge
Aggregates Industries recently lightened the load for the 73m-long bow string truss Acton Swing Bridge in England. When opened in 1933, it was the first floating swing bridge in the UK – floating on a pontoon.


The 84-year-old bridge, which is cared for by the Canal & River Trust charity, carries the busy A49 road over the River Weaver Navigation, in the county of Cheshire. A recent €1.7 million complete refurbishment included strengthening works to the underside of the bridge as well as improvements to its appearance.

Core to the project’s success was the ability to enhance the bridge’s structural integrity to allow for heavier traffic. The challenge was to do this without an increase of mass – given the required 2.5m allowance for boats passing underneath.

As such, 2297 Aggregate Industries’ Lytag secondary aggregate - up to 50% lighter than normal weight aggregate - was chosen by lead contractor Kier Construction. By using Lytag to replace the infill with the framework, the weight was effectively reduced from 2,400kg/m³ to 1,650kg/m³. This gave increased flexibility and durability for Kier, while ensuring an increased overall strength. The approach also negated the need for quarried aggregate, helping to reduce material requirements and ensure efficiencies.

With works now complete, the contract saw Aggregate Industries supply 100tonnes of 0/14mm Lytag - a tailored blend of aggregates specifically designed to offer a greater reduction in concrete density.

The design freedom afforded by Lytag offers the same level of structural performance as normal weight concrete, explained Steve Curley, general manager for Lytag at Aggregate Industries.


“However, it is significantly lighter, thus reducing the dead load of a construction. In projects such as Acton Swing Bridge, where strengthening works need to be achieved without resulting in an increase to size or mass, this product can really make the otherwise infeasible achievable.”

The lightweight concrete has a density of 1,850kg/m³ using natural fines (normal weight concrete of 2,400 kg/m³). If fines are used in conjunction with the 4/14mm aggregate, the density can be as low as 1,650kg/m³.

Using Lytag within the design can not only reduce the thickness of the slab, columns and foundations but reduce the amount of rebar required, resulting in a quicker more cost-effective greener structure.

Aggregate Industries is a member of the Swiss global building materials provider LafargeHolcim Group.

Road Structures

For more information on companies in this article

Related Content

  • Weigh in motion systems aid overweight vehicle detection
    July 12, 2012
    Modern weighing equipment helps road operators tackle the costly business of road damage caused by overloaded trucks as Patrick Smith reports. Overloading of commercial vehicles has a major impact on the life expectancy of road networks. The cost of premature road failure and repairs is a major burden on many governments particularly in developing countries where this problem diverts vital funding that could otherwise be spent on health and education.
    Read More
  • Plastic pad boosts stability
    February 22, 2012
    UK firm Nylacast now has a novel solution for boosting safety on machines featuring outrigger stabilisers.
    Read More
  • Doka’s Voest Bridge bypass project
    February 10, 2020
    The Voest Bridge over the Danube River is part of the A7 Mühlkreis Autobahn through Linz, Austria, is 40 years. Two bypass bridges are being constructed alongside the existing cable-stayed bridge as part of the client ASFINAG’s strategy to boost traffic capacity - around 100,000 vehicles cross the old bridge each day.
    Read More
  • Towards sustainable mobility
    April 12, 2012
    Tony Marshall, Director at Arup, looks at ways in which the company encourages sustainable mobility.From policy and systems development through to the design and execution of major infrastructure projects, he reviews Arup's global project experiences and research programmes. Space on roads throughout the modern world is decreasing as the volume of cars and road users increases. How can mobility be safeguarded without compromising quality of life or environmental well-being? As engineers, we have a responsib
    Read More

Highlighted Content