What Is The Ratio for Compressed Earth Blocks?

The ratio for making Compressed Earth Blocks (C.E.Bs) can vary based on the specific soil composition and the desired properties of the finished blocks. However, there is a general guideline that is commonly followed to achieve a good balance of strength and durability.

The ideal raw materials ratio for earth blocks : soil:cement=10:1/ soil:cement=12:1/ soil:cement=14:1. (According to the raw materials).

  • Soil Composition: The ideal soil for C.E.Bs typically consists of a mixture of clay and sand. The proportion of sand to clay in the soil is a critical factor. A commonly recommended ratio is approximately 70% sand to 30% clay. The high sand content helps to prevent the blocks from cracking as they dry, while the clay provides the necessary binding properties.

These tips would help you balance the ratio of clay for compressed earth blocks:

  • The basic soil containing¬† Sand of about 65-75% and Fines (Silt + Clay) of 25%
  • On the other hand, you can use 30% silt and 33% clay on a weight basis for the sand of 33%

There is yet another aspect of the soil grading composition limits. This is based on the formation of the soil.


For instance, you can use Sand (80%), Clay (10%), and Silt (10%0 for an Ideal Virgin Soil. A Good Virgin Soil demands Clay (10-20%), Sand (65-80%), and Silt (0-20%). It is also tenable to use Sand (60-80%), Clay (10-25%), and Silt (0-25%) on a Possible Virgin Soil.

  • Stabilizers: In many cases, a stabilizer such as cement or lime is added to improve the strength and water resistance of the blocks. The amount of stabilizer can vary, but a common ratio is between 5% and 10% of the soil’s volume. For instance, in a soil mixture with 10% stabilizer, you would use 90% of your clay-sand mixture.
    • For example, if you’re using a 70% sand and 30% clay mixture with 10% cement as a stabilizer, the ratios would be 63% sand (70% of 90%), 27% clay (30% of 90%), and 10% cement.
  • Water Content: The amount of water in the mixture is also crucial. The soil should have enough moisture to allow for proper compaction but not so much that it is overly wet. The exact amount of water will depend on the soil and weather conditions, but typically the mixture should have around 10-15% water by volume.
  • Testing: It is highly recommended to test your soil and adjust the ratios as needed. The ideal mixture will compact well and dry without cracking.


  • Local Conditions and Variations: Keep in mind that these ratios may need to be adjusted based on local soil conditions and climate. It’s often necessary to experiment with small batches to find the best mixture for your specific situation.
  • Quality Control: Consistency in the ratio and thorough mixing of the components is key to producing high-quality C.E.Bs.

Remember, the ratios can vary significantly based on the type of soil and the intended use of the blocks. It’s often a process of trial and error to determine the best mix for your specific circumstances.



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