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Weber - Saint-Gobain

Civil Engineering

Transport and Placement

Its light weight makes Leca® LWA  more economical to transport, typically needing a fifth of the number of loads required by traditional heavyweight materials, and this also has obvious environmental benefits.

It is economical and versatile to place typically tipped into position, spread with a tracked excavator and compacted by 3 passes of the same vehicle or it can be pneumatically blown into position, which offers specific benefits for some applications especially where site access is difficult.

Civil Engineering

It can be installed using machinery already in use on site for the placement of other earthworks applications - unlike other lightweight products that require costly specialist equipment and installation techniques.

The pellets of Leca® LWA are round and find their position within bulk fill very quickly when pressure is exerted. For this reason the layers to achieve adequate compaction are as deep as 1 metre, four times the depth of layer for traditional fill material making it at least four times quicker to install.

Once compacted, the modulus of elasticity is 15-20MN/m2 and the maximum level of effective stress to avoid crushing of grains is 100kN/m2. However, protected under a capping layer such as reinforced concrete, 10-20mm Leca® LWA is able to take weights of 200kN/m2.

Surplus can easily be disposed of - for instance, if an embankment is for temporary use, the Leca® LWA can easily be reclaimed and re-used in a number of other locations, unlike other man made materials.

Cost Benefits Of Leca® LWA:

  • Reduced transport costs
  • Reduced sitework costs
  • Reduced structural costs
  • Reduced timescales
Lighter than traditional fill

The table below compares the transportation of Leca® LWA to traditional quarried aggregates in order to demonstrate the size of load available considering UK highway weight restrictions.

Click to enlarge

Installation

Economical and versatile to place Leca® LWA is typically tipped into position, spread with a tracked excavator and compacted by 4 passes of the same vehicle or, it can be pneumatically blown into position, which offers specific benefits for some applications especially where site access is difficult.

Leca® LWA can be installed using machinery already in use on site for the placement of other earthworks applications - unlike other lightweight products that require costly, specialist equipment and installation techniques.

The pellets of Leca® LWA are round and find their position within bulk fill very quickly when pressure is exerted.  For this reason the layers to achieve adequate compaction can be as deep as 1 metre, six times the depth of layer for traditional fill material and with compaction more than ten times quicker to install.

Once compacted, the modulus of elasticity is 15-20MN/m² and the maximum level of effective stress to avoid crushing of grains is 100kN/m².  Increased loading can be achieved by introducting a capping Layer such as subbase material or concrete.

Surplus can easily be disposed of - for example, if an embankment is for temporary use, Leca® LWA can easily be reclaimed and re-used in a number of other locations, unlike other man made materials destined for landfill and expensive landfill charges.

Full guidance is shown in the Leca® LWA Construction Control Document.

Pneumatic Installation

Rounded in shape and light weight make it possible to blow Leca® LWA into position.  Using a trailer with auger discharge Leca® LWA can be blown distances of ›35 metres by hose into difficult to access areas.  Benefits include no storage or double handling, reduced plant, labour and timescales.

Pneumatic Discharge

Grand Union Canal