If you are involved in specifying drainage for a highway, airport apron, pedestrian precinct, or industrial warehouse, is your rulebook. Here is why:
There is no standard officially numbered "BS EN 7721." It is almost certainly a typo for BS EN 772-1 . The "dash" is a critical part of the naming convention used by the British Standards Institution (BSI) and the European Committee for Standardization (CEN).
BS EN 772-1 specifies the procedure to determine the compressive strength of masonry units (bricks, blocks, etc.) by applying a compressive load until failure. The standard ensures consistent, comparable strength results across laboratories and manufacturers. bs en 7721 pdf
The standard applies to various types of masonry units (clay, concrete, natural stone, etc.).
The compression machine must meet strict accuracy and repeatability limits, typically with a maximum permissible repeatability of 2.0% of the indicated force. If you are involved in specifying drainage for
This standard provides a rigorous, standardized method to verify the of construction materials. By following these procedures, manufacturers and engineers can ensure that individual masonry units meet the structural requirements of civil engineering projects, such as walls, partitions, and structural supports. Key Technical Requirements
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According to the standard, units must be prepared in specific ways before testing, including: Units are conditioned by drying, often at
It is important to distinguish this from the older or similarly numbered standards. This document specifically focuses on pre-manufactured drainage systems (often known as slot drains or channel drains) that incorporate a slotted top surface made from materials such as:
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