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.
Structural grades
Leca Structure 4–10
Product code ALS-0410
The workhorse grade for cast-in-place and precast structural lightweight concrete.
4–10 mm fraction at 320–400 kg/m³ loose bulk density and 1.5 MPa crushing resistance, pumpable to full building height.
- Grain size
- 4–10 mm
- Loose bulk density
- 320–400 kg/m³
Description
The most widely used grade in structural lightweight mix designs. A continuous grading with narrow spread reduces segregation during pumping.
On site: pre-soak for 30 minutes before batching. Dry aggregate absorbs part of the mixing water and slump falls during transport; pre-soaking removes that drift and keeps workability constant along the pump line.
Documents for this grade
Packaging & shipping
- Bulk tipper 60–90 m³
- Big bag 1 m³
Standards
- EN 13055-1
- ASTM C330
- ISIRI 7657
Technical data
| Grain size | 4–10 mm |
|---|---|
| Loose bulk density | 320–400 kg/m³ |
| Particle density | 650 kg/m³ |
| Crushing resistance | 1.5 MPa |
| Thermal conductivity | 0.098 W/m·K |
| Water absorption (24 h) | 16 % |
| pH | 7.5 |
| Fire resistance | 1150 °C |
Values published in datasheets are typical production values within the stated tolerance band. They do not replace engineering design, mix-design trials, or the requirements of a project specification.
Applications
Related 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
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