Leca® Lightweight Aggregate Concrete - LWAC
Technical Specifications
• The product complies with: EN 13055-1
• Fraction: 4-10 mm
• Loose bulk density: 272-368 kg/m 3 (approx. 320 kg/m 3 on average )
• Crush resistance: 1.07 N/ mm2
• Thermal conductivity: λ = approx. 0.100 W/mK*
• Reaction to fire: class A1 (non-flammable)
* Leca LWAC concrete is usually less stiff, consideration needs to be given to the reduction of self-weight and the resulting reduction in the depth of a beam or slab. Creep and Shrinkage should be considered at design stages.
Leca® Lightweight Aggregate Concrete
Leca® Lightweight Aggregate Concrete (4-10mm) is mainly used as an additive in industrially manufactured Concrete. One of the primary benefits of using Leca® Lightweight Aggregate Concrete in lightweight concrete production is its reduced density. The aggregate's unique porous structure significantly decreases the overall weight of the concrete, making them easier to handle and transport.
Overview of Leca® Lightweight Aggregate Concrete
Concrete Solution
Leca® Lightweight Aggregate Concrete Recipe
Concrete Solution
Leca® Lightweight Aggregate Concrete Applications
Understanding Leca® Lightweight Aggregate Concrete
- High pumping power should be avoided for LWAC, since it can promote segregation, changing also the absorption and the consistency of the placed concrete
- In general, LWAC can be easily pumped when pre-saturation is assured, until the internal moisture is circa 15%, assuming also that the viscosity is not too high. However, the pump selection depends a lot on the desired pumping performance and on the transport capacity (in height and in distance), being able to use, stationary pumps with compressor or; auto-pumps, with pressure technology applied by piston pump.
- Batching of lightweight concretes is normally done from ready-mixed concrete producers.
- At low work abilities, the concrete can easily be placed by skip or chute. Pumping lightweight concrete can be achieved, but care needs to be taken so that the concrete mix doesn’t separate. For pumpable mixes it is usual to use a natural sand, i.e. not to have a lightweight aggregate for the fine portion of the mix and to have a high workability so that increased pump friction and blockage is avoided. This is achieved with the use of admixtures. Over vibration of a lightweight concrete tends to cause segregation so a flowing concrete is best used when it is to be pumped as it requires only minimum vibration.
