Meeting The Specification for 10 N/mm2 Blocks with Celcon Hi-Tene Aircrete Blocks

BS 5628: Part 1: 1992 “Code of Practice for the Structural Use of Masonry”, Clause 32.2 defines the design strength of masonry as the characteristic strength multiplied by a capacity reduction factor, b, and divided by the appropriate partial safety factor for material, γm.

The capacity reduction factor, b, allows for the effects of slenderness of the wall and eccentricity of loads and is not related to the type of masonry units being used. The wall strength is therefore related to the ratio:-

Celcon Hi-Tene blocks have a specified compressive strength of 8.4 N/mm2 and are manufactured to the ‘Special’ category of manufacturing control as defined in BS 5628: Part 1 Clause 27.2.1.2. This means that the lower value for γm given in Table 4 of the code may be used for design purposes. The following table shows how the strength of a wall built with Celcon Hi-Tene blocks is equivalent to that built using 10N/mm2 solid blocks for which only ‘Normal’ category can be taken.

Typical block thickness

Celcon Hi-Tene
(
γm =3.1)

10N/mm2 Solid block
(
γm = 3.5)

fk

(BS5628: pt1:Table 2 mortar designation (iii)

fk / γm

fk

(BS5628: pt1:Table 2 mortar designation (iii)

fk / γm

100mm

7.2N/mm2

2.3N/mm2

8.2N/mm2

2.3N/mm2

150mm

5.8N/mm2

1.9N/mm2

6.5N/mm2

1.9N/mm2

200mm

4.9N/mm2

1.6N/mm2

5.5N/mm2

1.6N/mm2

This information has been sourced, reviewed and adapted from materials provided by H + H Celcon.

For more information on this source, please visit H + H Celcon.

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