Structural grades
Leca Structure 4–10
The workhorse grade for cast-in-place and precast structural lightweight concrete.
- Grain size
- 4–10 mm
- Loose bulk density
- 320–400 kg/m³
Applications
Structural lightweight concrete
A 25–35% reduction in concrete weight at the same strength class, with a direct effect on section sizes and foundation loads.
In tall buildings the structure's own dead weight is the greater part of what reaches the foundation. Replacing normal-weight aggregate reduces that load on every floor, and the effect accumulates all the way down.
In practice: smaller beam and column sections, less reinforcement, and — in refurbishment — the option of adding a storey without strengthening the existing foundation.
Mix design must be set out by volume rather than by weight, and the aggregate pre-soaked before batching.
Recommended grades
Structural grades
Leca Structure 10–20
The lightest structural fraction, for where dead load governs the design.
- Grain size
- 10–20 mm
- Loose bulk density
- 260–320 kg/m³
Reference projects
2024 Tehran, Iran
28-storey residential tower, Vanak
Structural lightweight concrete throughout the floor slabs, cutting seismic demand and foundation size.
Volume supplied 18,500 m³
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