What is the minimum compressive strength for these paving blocks?

The 28-day average compressive strength must be at least 4.0 N/mm² (Table 1).

What is the maximum allowed water absorption?

The average water absorption after 24 hours of immersion should not exceed 15% by mass (Table 1).

Are these blocks suitable for driveways?

Generally no. They are intended for light-duty paving like footpaths. For driveways with vehicular traffic, cement concrete blocks (as per IS 15658) are recommended.

What materials are used to make these blocks?

They are made from a mix of building lime (IS 712), pozzolana (like fly ash as per IS 3812 or surkhi as per IS 1344), aggregates (IS 383), and water (Clause 4).

IS 10360

: 1982

lime-pozzolana concrete blocks for paving

CurrentSpecializedSpecificationMaterials Science · Building Limes and Gypsum Products

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This standard specifies the requirements for materials, manufacture, dimensions, and physical properties like compressive strength and water absorption for lime-pozzolana concrete blocks used in paving. It is intended for low-traffic areas and also outlines sampling and testing methods to ensure conformity.

lime-pozzolana concrete blocks for paving

Quick Reference Values

Minimum Average Compressive Strength (28 days)4.0 N/mm²

Minimum Individual Compressive Strength (28 days)3.2 N/mm²

Maximum Average Water Absorption (24-hr cold water)15% by mass

Minimum Average Block Density1800 kg/m³

Standard Block Size 1300 x 200 x 75 mm

Standard Block Size 2200 x 100 x 75 mm

Length/Width Tolerance± 5 mm

Height Tolerance± 3 mm

Practical Notes

These blocks are primarily suited for pedestrian areas, footpaths, and courtyards, not for heavy vehicular traffic due to their lower strength compared to cement concrete blocks.

Curing of lime-based products is slower than Portland cement; adequate and prolonged moist curing is crucial to achieve the specified strength.

The quality and reactivity of the pozzolana (e.g., fly ash, surkhi) are critical for the long-term strength development and durability of these blocks.