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Characteristic compressive strength of masonry, ƒk, in N/mm²

a) Constructed with blocks having a ratio of height to
least horizontal dimension of 0.6
Mortar
designation		 Compressive strength of unit (N/mm²)
2.8
3.5
5.0
7.0
10
15
20
  35 or greater
( i )
1.4
1.7
2.5
3.4
4.4
6.0
7.4
  11.4
( ii )
1.4
1.7
2.5
3.2
4.2
5.3
6.4
  9.4
( iii )
1.4
1.7
2.5
3.2
4.1
5.0
5.8
  8.5
( iv )
1.4
1.7
2.2
2.8
3.5
4.4
5.2
  7.3

 

b) Constructed with hollow blocks having a ratio of height to
least horizontal dimension of 2.0 and 4.0
Mortar
designation		 Compressive strength of unit (N/mm²)
2.8
3.5
5.0
7.0
10
15
20
  35 or greater
( i )
2.8
3.5
5.0
5.7
6.1
6.8
7.5
  11.4
( ii )
2.8
3.5
5.0
5.5
5.7
6.1
6.5
  9.4
( iii )
2.8
3.5
5.0
5.4
5.5
5.7
5.9
  8.5
( iv )
2.8
3.5
4.4
4.8
4.9
5.1
5.3
  7.3

 

c) Constructed with solid concrete blocks having a ratio of
height to least horizontal dimension of 2.0 and 4.0
Mortar
designation		 Compressive strength of unit (N/mm²)
2.8
3.5
5.0
7.0
10
15
20
 35 or greater
( i )
2.8
3.5
5.0
6.8
8.8
12.0
14.8
 22.8
( ii )
2.8
3.5
5.0
6.4
8.4
10.6
12.8
 18.8
( iii )
2.8
3.5
5.0
6.4
8.2
10.0
11.6
 17.0
( iv )
2.8
3.5
4.4
5.6
7.0
8.8
10.4
 14.6

 


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