What is the minimum compressive strength for these blocks?

The average wet compressive strength of 10 blocks should be at least 10 N/mm² (Table 1).

What is the maximum allowed water absorption?

The average water absorption of three blocks must not exceed 12 percent by mass (Table 1).

What is the recommended curing process?

Moist curing for at least 7 days, followed by air curing for at least 21 days before use (Clause 4.6).

What are the standard block dimensions specified?

200x100x80 mm and 200x100x60 mm, with specified tolerances (Clause 5.1).

IS 10359

: 1982

Code of practice for manufacture and use of lime-pozzolana concrete blocks for paving

CurrentSpecializedCode of PracticeMaterials Science · Building Limes and Gypsum Products

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This standard provides guidelines for the manufacture and use of lime-pozzolana concrete blocks intended for paving applications. It covers material requirements, mix proportions, manufacturing processes, curing, and physical properties like compressive strength and water absorption. It also includes recommendations for laying the blocks.

Code of practice for manufacture and use of lime-pozzolana concrete blocks for paving

Quick Reference Values

Minimum Average Wet Compressive Strength10 N/mm²

Minimum Wet Compressive Strength of Individual Block8 N/mm²

Maximum Average Water Absorption12% by mass

Standard Block Size 1200 x 100 x 80 mm

Standard Block Size 2200 x 100 x 60 mm

Length/Width Tolerance±3 mm

Height Tolerance±2 mm

Minimum Curing Period28 days (7 days moist + 21 days air)

Practical Notes

This is a specialized code for an alternative, low-energy paving material, less common than conventional cement concrete paving blocks (covered in IS 15658).

Proper and complete curing is critical for lime-pozzolana mixes to achieve design strength; the specified 28-day period must be strictly followed.

The quality and reactivity of the pozzolana (e.g., fly ash, calcined clay) and lime significantly impact the block's final strength and durability.