Paving
IS 15658:2021 - Concrete Paving Blocks
Key technical information and requirements related to Paver Blocks from IS 15658:2021.
IS 15658: 2021 CONCRETE PAVING BLOCKS — SPECIFICATION
Key Information
PAVING BLOCK (DEFINITION):
Solid un-reinforced precast cement concrete paving units used in the surface course of pavements, with minimum horizontal cross section of 50 mm from any edge in any direction, having aspect ratio not more than four, except for complementary blocks.
GRADES OF PAVING BLOCKS FOR DIFFERENT TRAFFIC CATEGORIES (Table 1)
| # | Grade Designation | Compressive Strength at 28 days, fck MPa |
Traffic Category | Thickness Min., mm | Traffic Examples of Application |
|---|---|---|---|---|---|
| 1 | M 30 | 30 | Non-traffic | 50 | Building premises, monument premises, landscapes, public gardens/parks, domestic drives, paths and patios, embankment slopes, sand stabilization area, etc. |
| 2 | M 35 | 35 | Light traffic | 60 | Pedestrian plazas, shopping complexes ramps, car parks, office driveways, housing colonies, office complexes, rural roads with low volume traffic, farmhouses, beach sites, tourist resorts, local authority footways, residential roads, etc. |
| 3 | M 40 | 40 | Medium traffic | 80 | City streets, small and medium market roads, low volume roads, utility cuts on arterial roads, etc. |
| 4 | M 50 | 50 | Heavy traffic | 100 | Bus terminals, industrial complexes, mandi houses, roads on expansive soils, factory floor, service stations, industrial pavements, etc. |
| 5 | M 55 | 55 | Very Heavy Traffic | 100 | Container terminals, ports, docks yards, mine access roads, bulk cargo handling areas, airport pavements, etc. |
DIMENSIONS AND TOLERANCES (Table 2)
| # | Dimensions | Requirement | Tolerances | Tolerances |
|---|---|---|---|---|
| # | Dimensions | Requirement | Thickness < 100 mm | Thickness ≥ 100 mm |
| 1 | Width, W, mm | (Note 1) | +/- 2 mm | +/- 3 mm |
| 2 | Length, L, mm | (Note 1) | +/- 2 mm | +/- 3 mm |
| 3 | Thickness, Th, mm | 50-120 mm, (Notes 2 & 3) | +/- 3 mm | +/- 4 mm |
| 4 | Aspect Ratio, L/Th | Max. 4.0 | ||
| 5 | Arris / Chamfer, mm | Min. 5 mm, Max. 7 mm | +/- 1 mm | +/- 1 mm |
| 6 | Thickness of Wearing Layer, mm | Min. 6 mm | ||
| 7 | Deviation from Squareness, mm | Nil | +/- 2 mm | +/- 3 mm |
Notes:
The value shall be decided by mutual agreement between the manufacturer and purchaser.
The thickness shall also meet the requirements for various grades of paving blocks as given in Table 1.
When agreed between the manufacturer and the purchaser, blocks having thickness more than 120mm may also be manufactured. For such blocks, the tolerance on width and length shall be +/- 4 mm.
PHYSICAL REQUIREMENTS FOR PAVING BLOCKS (Table 3):
| # | Characteristic | Requirement | Method of Test |
|---|---|---|---|
| 1 | Water Absorption, Max Individual Average |
7% 6% |
Annex C |
| 2 | Compressive Strength, MPa, Min Individual Average |
fck – 3 (Note 1) fck + 0.825 x established standard deviation (rounded off to nearest 0.5MPa) or fck + 3, whichever is greater (Note 2) |
Annex D |
| 3 | Abrasion Resistance, Max Dry: Individual Average Wet: Individual Average |
20,000 mm3 per 5,000 mm2 18,000 mm3 per 5,000 mm2 22,000 mm3 per 5,000 mm2 20,000 mm3 per 5,000 mm2 |
Annex E |
| 4 | Tensile Splitting Strength, MPa, Min Individual Average |
0.08 fck (for grades < M40) 3.0 MPa (for grades ≥ M40) 0.085 fck (for grades < M40) 3.6 MPa (for grades ≥ M40) |
Annex F |
| 5 | Flexural Strength, MPa, Min Individual Average |
0.10 fck 0.11 fck |
Annex G |
| 6 | Freeze Thaw Durability | Note 3 | Annex H |
Notes:
The value of fck is given in col 3 of Table 1.
In the absence of established value of standard deviation, it may be assumed as 5, and attempt should be made to obtain results of 30 samples as early as possible to establish the value of standard deviation.
The value shall be decided by mutual agreement between the manufacturer and purchaser.
(For further details please refer to the Standard)
