Physical & Mechanical Properties of Interlock Tiles C1731-16

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The physical and mechanical properties of the interlocking concrete blocks shall conform to the following requirements. 

A. Bulk Density (min. 48 hrs. immersion):

  1. Average > 2.375 T/m3
  2. Minimum = 2.330 T/m3 9 

B. Bulk/Apparent Density Ratio (min. 48 hrs. immersion)

  1. Average > 0.88
  2. Minimum = 0.87 

C. Water Absorption (min. 48 hrs. immersion, tested according to ASTM C140)

  1. Maximum = 3% for aggressive exposure zones1
  2. 4.5% for less aggressive exposure zones2 

D. Compressive Strength (min. 48 hrs. Immersion tested according to BS 6717:1993)

  1. Average ≥ 55 Mpa for aggressive exposure zones, and 49 for less aggressive exposure zones
  2. Minimum = 47 Mpa for aggressive exposure zones, and 44 for less aggressive exposure zones 

E. Abrasion Resistance (for vehicular areas only, tested as per ASTM C418)

  1. Average thickness loss < 3 mm
  2. Maximum volume loss = 150 mm3 per 500 mm2
  3. Or comply with BS EN 1338 (maximum volume loss 20,000 mm3 per 5,000 mm2 

F. Flexural Strength (tested according to ASTM C293 / C293M: 10)

  1. Average Flexural Strength > 5 Mpa (Dry)
  2. Minimum Flexural Strength = 4.5 Mpa (Dry) 

G. At least 4 out of 5 of all tested specimens shall meet the specified average criteria for all physical and mechanical properties specified. 

H. The paving block manufacturers may achieve the physical properties specified herein for their products through various means such as the addition of mineral and/or chemical admixtures to the concrete mix for the paving blocks.

I. Concrete paving blocks shall be adequately cured, as specified so that they comply with all the physical and mechanical properties upon delivery to the site.

J. Any consignments delivered to a site that does not comply with the specified physical and mechanical properties shall be rejected by the Purchaser and The manufacturer shall remove the consignment from the site. 

K. Durability Criteria: 

  1. AS/NZS 4456.10:2003, method B
  2. Resistance to sodium sulfate and sodium chloride
  3. Conduct the test for 40 cycles and record the total loss
  4. Total loss after 40 cycles < 1% of the mass of the specimen 

Dimensional Tolerance 

A. The length or width of each unit shall not differ by more than ±1.6mm from the designated dimensions. 

B. The height of each unit shall not differ by more than ±3% from the specified standard thickness. 

Location: Riyadh 11564, Saudi Arabia

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