Geotechnical Use

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

100% Eco-Friendly and Sustainable

Good Water Absorption

18 to 23 % of size

Good Water Drainage

Excellent Drainage Property

Surface Alkalinity

Neutral pH

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

Earthquake Resistant


High Resistance to Water Absorption

Excellent Filtration Media

Unique structure suited to filter water