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Leca® or Lytag® Lightweight Aggregate?   Thursday 27 February, 2014
Summary:

Specialist Aggregates compares the properties of Leca® and Lytag®

Content:

Update Feb 27th 2014
New production facility commissioned, Lytag ® show off their true colours at the recent Concrete Show (NEC Feb 27/28th 2014). As sales manager Michelle Walker explained, Lytag has been used as a lightweight structural aggregate on many of London's iconic buildings including The Shard and the Post Office Tower.

Main Story Sept 2013
With Lytag® commissioning a new production facility at Drax in Yorkshire (Sept 2013), for the manufacture of pulverised fuel ash based lightweight aggregate, Specialist Aggregates review the relative merits of the lightweight aggregate market leaders, Leca® and Lytag®®

Leca® and Lytag® are superficially similar, both being expanded “fired” honeycombed pellets, however, for many applications the choice is a compromise between achieving a beneficial light weight advantage by using Leca® against the additional strength achieved by employing Lytag®.

Lytag® is approximately half as dense as normal limestone or gravel aggregate, however, Leca® is itself half as dense as Lytag® (i.e. four times lighter than “normal aggregate”). Broadly, use Leca® where reduction in weight is the primary consideration, for example backfill to structures, for drainage especially green roofs and as fill for feature plant containers. Lytag® is used where design strength needs to be achieved with reduction in weight compared to natural aggregates, for example in wet pour and precast concrete, or loose backfill to services where loads may be applied, it has also been successfully used for vehicle arrestor beds.

There is no absolute correlation between lightweight aggregate properties and concrete strength, however, as a loose material Lytag® has a greater crushing strength than Leca® (BSEN 13055). Direct correlation cannot be made between the crushing strength of lightweight and “normal aggregates” as differing test methods are used.

Both Leca® and Lytag® provide thermal insulation to a similar degree, exact data can be obtained from manufacturers if this aspect is critical for a given application.

When loose laid, in the short term Lytag® has a lower water absorption compared to Leca®, However, in the long term the water absorption of both products is similar at around 30%.

Lytag® can claim green credentials as it is a secondary aggregate produced from the ash of coal fired power stations – although clearly the coal has to be mined and burnt in the first place! Leca® is produced from virgin clay aggregate. Whilst we have not seen absolute figures the energy required to manufacture both products is likely to be similar.

Both products are chemically inert, do not degrade and are not frost susceptible.

Neither Lytag® nor the brown form of Leca® is pretty! Leca® produce a terracotta coloured version of their product which is widely used as a decorative lightweight aggregate.

Absolute quantitative comparison has not been made in this précis of characteristics – for definitive data see manufacturer’s individual data sheets.

Specialist Aggregates supply products from both companies- for further details please use the "Contact Us" facility or follow the link below.


Extra Information:

For more information, please visit this related link:  Buy lightweight Aggregates.



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Leca<sup>®</sup> or Lytag<sup>®</sup> Lightweight Aggregate?
Leca<sup>®</sup> or Lytag<sup>®</sup> Lightweight Aggregate?
Leca<sup>®</sup> or Lytag<sup>®</sup> Lightweight Aggregate?
Leca<sup>®</sup> or Lytag<sup>®</sup> Lightweight Aggregate?
Leca<sup>®</sup> or Lytag<sup>®</sup> Lightweight Aggregate?
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