What is the minimum compressive strength for soil-cement blocks?

The minimum compressive strength depends on the class: 2.0 N/mm² for Class 20 and 3.0 N/mm² for Class 30.

What is the maximum allowed water absorption for these blocks?

The maximum permissible water absorption is 15% by mass after 24 hours of immersion in water.

What are the standard dimensions for soil-cement blocks?

Standard nominal lengths are 290 mm, 240 mm, and 190 mm, with width and height varying based on the specific block designation.

IS 1725

: 1982

soil-based blocks used in general building construction

CurrentSpecializedSpecificationMaterials Science · Clay and Stabilized Soil Products

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This standard lays down the requirements for solid soil-cement blocks (stabilized soil blocks) used in general building construction. It covers dimensions, material composition, manufacturing methods, and physical requirements like compressive strength and water absorption to promote durable low-cost housing.

soil-based blocks used in general building construction

Quick Reference Values

minimum compressive strength class 202.0 N/mm²

minimum compressive strength class 303.0 N/mm²

maximum water absorption15% by mass

maximum loss of mass in weathering5%

standard block lengths290 mm, 240 mm, or 190 mm

dimensional tolerance length±3 mm

Practical Notes

Ensure the soil used is free from organic matter and deleterious materials; an optimal mix typically requires a clay fraction of 10-15%.

Soil-cement blocks must be thoroughly cured (usually under damp conditions or by sprinkling water) for at least 28 days to achieve their target compressive strength.

Best suited for load-bearing walls in single or double-story low-cost or rural structures where environmental exposure is moderate.