Relationship between flexural and compressive strengths of mortars
Age
(days)
Flexural strength (as % of compressive strength)
(mix proportions by volume)
1 : 1
NHL 3.5 : sand
1 : 1.5
NHL 3.5 : sand
1 : 2
NHL 3.5 : sand
1 : 3
NHL 3.5 : sand
1 : 1 : 6
PC : CL90 : sand

7
14
28
56
91
182
365

76
52
47
44
42
40
39

78
54
49
46
45
44
43

80
64
56
53
51
50
49

80
70
67
65
64
61
55

30
31
32
33
33
34
34

Technical Report by Paul Livesey
Technical Manager of Castle Cement, a division of Heidelberg Cement Group


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