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Hydraulic Interlocking Paver Blocks

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IS 15658 : 2021 — Table 2 — Dimensions and Tolerances (Clause 6 & 7.2)

Sl No. Dimensions Requirement Tolerance (Th ≤ 100 mm) Tolerance (Th > 100 mm)
i Width W (mm) As agreed¹ ±2 mm ±3 mm
ii Length L (mm) As agreed¹ ±2 mm ±3 mm
iii Thickness Th (mm) 50–120² ³ +3 mm +4 mm
iv Aspect ratio L/Th (max) 4 — —
v a Arris / Chamfer (min) 5 mm +1 mm —
v b Arris / Chamfer (max) 7 mm +1 mm —
vi Thickness of wearing layer (min) 6 mm — —
vii Plan area Asp (optional) As agreed¹ +0.001 m² +0.001 m²
viii Ratio Asw/Asp (min) 0.75 −0.01 −0.01
ix Deviation from squareness Nil +2 mm +3 mm

 

  1. Notes:
  • 1 The value shall be decided by mutual agreement between manufacturer and purchaser.
  • 2 Thickness shall also meet grade requirements in Table 1.
  • 3 For blocks thicker than 120 mm, tolerance on width & length is ± 4 mm.

IS 15658 : 2021 — Table 3 — Physical Requirements (Clause 7.3)

Sl No. Characteristic Requirement Test Method (Ref)
i a Water absorption — individual ≤ 7 % Annex C
i b Water absorption — average ≤ 6 % Annex C
ii a Compressive strength — individual fck − 3 MPa Annex D
ii b Compressive strength — average fck + 0.825·SD or fck + 3 MPa Annex D
iii a Abrasion (dry) — individual ≤ 20 000 mm³/5000 mm² Annex E
iii b Abrasion (dry) — average ≤ 18 000 mm³/5000 mm² Annex E
iii c Abrasion (wet) — individual ≤ 22 000 mm³/5000 mm² Annex E
iii d Abrasion (wet) — average ≤ 20 000 mm³/5000 mm² Annex E
iv a Tensile splitting — individual 0.08 fck (grades< M40) / 3 MPa (≥ M40) Annex F
iv b Tensile splitting — average 0.085 fck (grades< M40) / 3.6 MPa (≥ M40) Annex F
v a Flexural strength — individual 0.10 fck Annex G
v b Flexural strength — average 0.11 fck Annex G
vi Freeze–thaw durability (optional) As specified³ Annex H

 

  1. Notes:
  • 1 fck values are listed in Table 1.
  • 2 If SD (standard deviation) not yet established, assume SD = 5 MPa until 30 samples are recorded.
  • 3 Requirement to be agreed between manufacturer and purchaser.

 

IS 15658 : 2021 — Table 4 — Sampling Requirements (Clause 8)

Sl No. Property Clause Ref. No. of Blocks (Third‑Party QA) No. of Blocks (Mfr/Purchaser QA) *
i Visual inspection 7.1 8 4 (16)
ii Dimensions 7.2 8 4 (16)
iii Water absorption 7.3 3 3
iv Compressive strength 7.3 8 4 (16)
v Tensile splitting 7.3 8 4 (16)
vi Flexural strength 7.3 8 4 (16)
vii a Abrasion resistance (dry) 7.3 3 3
vii b Abrasion resistance (wet) 7.3 3 3
viii Freeze‑thaw durability 7.3 3 3

 

  1. Notes:
  • * Figures in brackets denote numbers to be sampled when secondary sampling is to be avoided.