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

  • Innovative, quality asphalt surfacing solutions
    February 22, 2012
    An array of innovative mix designs and special processes have been introduced to the paving market in recent years. These are now being used in many site applications and are offering contractors the benefits of fast application and high surface quality while providing safe, cost-effective and hard wearing solutions with long life for clients.
    Read More
  • Terex built for bridge paving
    November 29, 2012
    To meet a need to carry out complex modern bridge designs, the Terex Bid-Well 3600 paver is available with truss transition inserts, increasing maximum paving width from 27.4-33.5m. The inserts adjust truss depth from 914-1219mm toward the paver’s centre, reducing frame deflection and this is said to increase surface profile smoothness. Offering paving widths from 4.6-33.5m with optional transition inserts, the 3600 gives companies more versatility for paving a wide variety of bridge designs, including mult
    Read More
  • Indeco cuts up New York City’s old Kosciuszko Bridge
    November 23, 2017
    An Indeco ISS 45/90 is proving essential for demolishing the old Kosciuszko Bridge in New York City. New York City’s old 1.9km Kosciuszko Bridge, which crosses Newtown Creek connecting Green Point, Brooklyn with Maspeth, Queens, has been out of service since April. By the end of the year, the polygonal Warren through-truss structure will be no more. To replace the old bridge, in 2009, the New York State Department of Transportation planned the construction of two cable-stayed replacement bridges.
    Read More
  • Upgrading a busy A road link in the UK
    July 4, 2018
    The upgrade to the UK’s busy A14 route will address a significant traffic bottleneck - Mike Woof writes The UK is suffering badly from traffic congestion, a problem that is particularly severe in and around its major cities. Lack of investment in road construction over many years has resulted in a major backlog of work, while the country has seen growing vehicle numbers. To make matters worse, there have been few additions to the major road network since the late 1980s and early 1990s. And the combinatio
    Read More

Highlighted Content