What is the minimum recommended thickness for paver blocks?

60 mm for light traffic/pedestrian areas, 80 mm for medium traffic, and 100-120 mm for heavy traffic areas (Annex A).

What are the strength grades specified in IS 15658?

The code specifies grades from M30 up to M60, corresponding to characteristic compressive strengths of 30 to 60 MPa respectively (Table 2).

What is the maximum allowed water absorption for paver blocks?

The average absorption should not exceed 6% by mass, and no individual sample should exceed 7% (Table 2).

What are the dimensional tolerances for a standard paver block?

Tolerance on length and width is ± 2 mm, and on thickness is ± 3 mm (Table 1).

IS 15658

: 2023

Precast Concrete Blocks for Paving - Specification

CurrentFrequently UsedSpecificationBIMTransportation · Flooring and Paving

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This standard specifies the requirements for materials, dimensions, physical properties, and testing of precast concrete blocks used for paving surfaces. It covers aspects like compressive strength, water absorption, and abrasion resistance to ensure durability and performance for pedestrian and vehicular traffic areas.

Specifies requirements for precast concrete blocks intended for use in flexible paving systems.

Quick Reference Values

Dimensional tolerance on length/width± 2 mm

Dimensional tolerance on thickness± 3 mm

Minimum average compressive strength (M30 Grade)30 MPa

Maximum water absorption (average)6 % by mass

Maximum abrasion wear depth (Class 3 - Heavy Traffic)2.5 mm

Minimum recommended thickness for pedestrian areas60 mm

Practical Notes

The performance of paver blocks is highly dependent on the quality of the bedding sand and sub-base; refer to IRC: SP: 63 for laying guidelines.

When specifying, clearly state the required strength grade (e.g., M40, M50) and abrasion class (1 to 4) based on the expected traffic type.

Chamfers on the block edges are crucial to prevent spalling under traffic and should be checked during visual inspection.