Many developed countries are using Expanded Clay Aggregate (ECA ®) geotechnical filling material since beginning of 20th century. Expanded Clay Aggregate (ECA ®) is a unique green construction material which is 100% natural and inert light weight aggregate.
Expanded Clay Aggregate (ECA ®) is a round pellet structure produced by firing natural clay at temperature of 1200°C. The result is a hard, honeycombed structure of interconnecting voids within the aggregate. The particles formed are round in shape and generally range in size ranging from 0-30mm. These are processed to the required grading, depending on the versatile applications.
With low weight and high in strength, it can be used in structural backfill against foundations, retaining walls and bridge abutments. Expanded Clay Aggregate (ECA ®) is a preferred material due to its ability to reduce earth pressure up to 75% compared to conventional materials in the market. Expanded Clay Aggregate (ECA ®) helps to increase ground stability while reducing settlement and land deformation. Due to its excellent drainage property Expanded Clay Aggregate (ECA ®) can drain the surface water and groundwater to control ground water pressures.
Expanded Clay Aggregate in civil engineering applications in covered and declared by European Standard EN 15732 along with Lightweight fill and thermal insulation products for civil engineering applications (CEA) and Expanded Clay lightweight Aggregate products (LWA).
Low density and ease of handling, coupled with consistent high quality, make Expanded Clay Aggregate (ECA ®) a highly competitive alternative to other lightweight materials. Expanded Clay Aggregate (ECA ®) grout is used for flooring (finishing) and roofing with thermal and sound insulation advantage.
Expanded Clay Aggregate (ECA ®) has a vital application in water treatment facilities for the filtration and purification of Industrial rouge effluents, municipal wastewater and drinking water as well as in other filtering processes, including those for dealing with agriculture wastewater and fish farms.
European Standard EN 13055-2 signifies the coefficient of water absorption of Expanded Clay Aggregate (ECA) by immersion of dry clay aggregate in water for 24 hours. Comparison of its weight before and after test (post drainage) gives the quantity of water that has been absorbed by the granules. The grading of expanded clay for most geotechnical applications is 8-15 mm or 0-30 mm depending on applications.
100 % Inert
Light in Weight
Reduction of 40-50% Load
High Compressive Strength
Cylinder Compressive Strength 0.6 to 3.0 N/mm2
Non-Toxic & Eco- Friendly
Green Material, 100% Eco-Friendly and Sustainable
Good Water Absorption
18 to 23 % of size
Good Water Drainage
Excellent Drainage Property
Excellent Thermal Insulation
Thermal Conductivity 0.097 to 0.10 W/mK
Excellent Sound Insulation
Excellent Acoustic Insulation Property
Low-Coefficient of Thermal Expansion
Excellent Fire Resistance
1 to 6 hrs - 9 to 19 cm LAC 1100 kg/m³
High Resistance to Water Absorption
Excellent Filtration Media
Unique structure suited to filter water
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