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
Producing expanded clay aggregate since 1996
Lightweight expanded clay aggregate, graded to repeat
About
One material, three engineering advantages
LECA is a light, porous, entirely mineral granule produced by firing clay in a rotary kiln at around 1,200 °C. It reduces structural dead load, insulates, and stays chemically stable — at the same time.
The same material trades under several names — expanded clay aggregate, lightweight expanded clay aggregate, LECA — and they all mean this one product. Arta Leca produces it to standard grading ranges.
Products
Production grades
Each grade is optimised for a specific duty by grain fraction and bulk density.
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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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Fill & screed grades
Leca Fill 3–10
The standard grade for roof screeds and void filling.
- Grain size
- 3–10 mm
- Loose bulk density
- 380–450 kg/m³
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Horticulture & green roof
Leca Garden 4–10
Washed and dust-free, for growing media and hydroponics.
- Grain size
- 4–10 mm
- Loose bulk density
- 300–380 kg/m³
Applications
Industries & applications
From structural lightweight concrete to geotechnical fill and growing media — every application specifies a different grade.
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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.
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Roof screeds & floor build-ups
Lightweight falls that double as a continuous insulation layer, without loading the slab.
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Geotechnical fill
Lightweight embankment over soft ground and backfill behind retaining walls, designing out settlement and lateral pressure.
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Green roofs
The drainage course and part of the growing medium, at the lowest saturated weight available.
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Horticulture & hydroponics
An inert, disease-free and reusable growing medium.
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Thermal insulation
A mineral, non-combustible insulant with no performance loss over the building's life.
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Filtration & water treatment
Filter bed and biofilm carrier in wastewater treatment and drainage systems.
Quality control
We build to standards; we deliver quality.
Every production shift is tested in the plant laboratory for grading, loose bulk density, water absorption and crushing resistance. Results are retained per batch, and a certificate of analysis is issued with each consignment at loading.
Completed projects
Reference projects
A selection of works supplied with Arta Leca aggregate.
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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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2023 Hormozgan, Iran
Lightweight embankment, Bandar Abbas port yard
Conventional fill replaced with expanded clay over soft marine clay, designing out long-term settlement.
Volume supplied 42,000 m³
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2023 Doha, Qatar
Green roof, Doha office complex
Intensive green roof drainage across 9,000 m² under a tight dead-load budget.
Volume supplied 3,200 m³
News & insights
News & technical insights
Engineering notes, production updates and material selection guidance.
Get a quotation for your project
Send us the specification, the volume you need and the delivery point. Our technical sales desk replies within one working day.