What is the minimum compressive strength for a precast concrete stone masonry block?

The minimum average compressive strength at 28 days should be 5.0 N/mm² (Table 3).

What is the recommended mortar mix for general construction with these blocks?

A cement-sand mortar of 1:6 proportion is recommended for general work. For specific requirements like better workability or strength, a 1:4 mix can be used (Clause 6.1).

What is the maximum allowed thickness for mortar joints?

The thickness of both bed joints and vertical joints should not exceed 10 mm (Clause 7.4).

How long should the blocks be cured before use?

The blocks shall be cured by submerging in water for a minimum period of 21 days (Clause 5.5).

IS 14213

: 1994

Code of practice for construction of walls using precast concrete stone masonry blocks

CurrentSpecializedCode of PracticeBIMMaterials Science · Planning, Housing and Pre-fabricated Construction

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This standard provides guidelines for the construction of walls using precast concrete stone masonry blocks. It covers the requirements for materials, manufacturing process, dimensions, strength of the blocks, as well as the mortar mix and construction practices for laying and curing the walls. The code aims to ensure quality and structural integrity in masonry work utilizing these specific precast units.

Code of practice for construction of walls using precast concrete stone masonry blocks

Quick Reference Values

Minimum average 28-day compressive strength of blocks5.0 N/mm²

Maximum thickness of mortar joints10 mm

Standard cement-sand mortar proportion for general work1:6

Minimum water curing period for blocks21 days

Minimum period of curing for wall masonry7 days

Tolerance on length and width of block±5 mm

Tolerance on height of block±3 mm

Practical Notes

Ensure blocks are soaked in water for at least 15 minutes before use to prevent them from absorbing water from the mortar, which is crucial for a strong bond.

Strictly adhere to the maximum joint thickness of 10 mm to ensure uniform stress distribution and prevent weak points in the wall.

Proper curing of both the blocks (21 days) and the finished wall (7 days) is essential to achieve the designated strength and durability.