Table-1: Compressive Strength and Density of Concrete Blocks The average compressive strength and density of eight blocks shall not be less than as specified in Table-1 below. The solid concrete blocks shall have a block density of not less than 1800 kg/m 3. These shall be manufactured for minimum compressive strengths of 4.0 and 5.0 N/mm 2, respectively. These grades of concrete blocks are used as non-load bearing units and shall have a block density of less than 1500 kg/m 3 but not less than 1000 kg/m 3. These shall be manufactured for minimum average compressive strength of 1.5 N/mm 2 at 28 days. These are also used as load-bearing units and shall have a block density of 1500 kg/m 3 but not less than 1000 kg/m 3. These shall be manufactured for minimum compressive strengths of 2.0, 3.0, and 5.0 N/mm 2 respectively, at 28 days. ![]() These are used as load-bearing units and shall have a minimum block-density of 1500 kg/m 3. The concrete blocks shall be manufactured for minimum compressive strengths of 3.5, 4.5, 5.5, and 7.0 N/mm 2 respectively, at 28 days. The hollow concrete blocks shall be classified in the following four types: 1. The tolerance in the length of the units shall not be more than +/- 5 mm and maximum variation in height and width of the unit, not more than +/- 3mm. ![]() In addition to the blocks mentioned above, blocks shall be manufactured in half lengths of 200, 250, and 300 mm to correspond to the full-lengths. The nominal dimensions of the concrete blocks are given below: The concrete block -hollow (open or closed cavity) or solid shall be referred to by its nominal dimensions. They include stretcher, corner, double corner or pier, jamb, header, bullnose, and partition block, and concrete floor units. The concrete block units shall be made in sizes and shapes to fit different construction needs. ![]() Hollow and solid concrete blocks shall be sound and free from cracks, broken edges, honeycombing, and other defects that would interfere with the proper placing of block or impair the strength or performance during construction.
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