Bridges & Roads

Foamed Concrete for Bridges & Roads

The use of foamed concrete is becoming increasingly popular with designers and engineers. Light weight materials such as foamed concrete, ranging in density from 500kg/m³ to 1400kg/m³ have been used to satisfy many engineering applications.

Where roads and bridges combine there is often a requirement to support or re-enforce the road deck, or make an old structure safe. For these applications foamed concrete can be pumped from a distance and placed within the structure or between piers, the fluid nature of the material will allow a complete fill that will encapsulate and support to bottom of the deck.

There are many bridges in the UK, comprising of; foot, road and rail, as well as many dis -used structures that used to span or carry historic rail lines found all over the UK.

A typical example of foamed concrete used to infill voids in bridge piers as well as the construction of lightweight decks and abutment construction.

Its free-flowing lightweight properties reduces the load on the foundations whilst increasing the strength of the structure making it ideal in the use of bridge strengthening.

Foamed concrete, when used as trench infill, will encapsulate pipes and services to guarantee a permanent first-time reinstatement and is recommended in the Road and Streetworks Act.

Light weight Road sub base foamed concrete for Dartford park development.

Wakefield, Fall lane, Leeds, East Ardsley, WF3

Propump Engineering worked with prominent civil engineers on behalf of the Rail authorities. Strengthening a weak bridge in East Ardsley, Leeds, West Yorkshire. Fall Lane bridge spanned a multi lane rail line. The project required Increasing the 7.5 tonne limit to accommodate large goods vehicles, however it also required a suitable material to transfer the load from the underside of the deck to the ground.

The client approached Propump Engineering to use foamed concrete as the mass void infill material requiring over 3000 m3 . Because It can be placed in large daily quantities, flows large distances and is self-consolidating. Foamed Concrete requires far less working than a typical concrete during placement.

Firstly, the multi span bridge required the supports and sides encapsulated with block work and red brick facing. Then, Propump placed their proprietary ultra-light weight foamed concrete manufactured at a density of 500 kg/m3 . Consequently, filling the spans from the ground up to the road deck over a period of 4 weeks.

Filling the high span with a solid homogenous material that doesn’t require compacting or vibration. A staggering 25 cubic metres is placed for every 6 cubic metre delivery on site. Foamed concretes have a typical strength of 1 – 5 Newton per mm2 and a range of densities from 500kg/m3 -1500kg/m3.


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