APPENDIX B: BOND STRENGTH OF MORTAR JOINTS
NCMA CPAR Project Sections 1.2.4 & 2.2. September 1995
Mortar bond strength according to ASTM
Comp.
Tens.
Comp.
Tens.
Resisting bond
bond
bond
bond
moment strength strength strength strength
Moist %
(kgf-m) (MPa) (MPa)
(psi)
(psi)
16%, no freeze
12.49
2.39
0.23
346.7
34.0
16%, freeze
13.86
2.65
0.26
384.6
37.8
10%, freeze
11.08
2.12
0.21
307.6
30.1
8%, freeze
8.27
1.58
0.15
229.7
22.3
6%, freeze
10.79
2.07
0.20
299.6
29.3
KC1, no freeze
31.57
6.04
0.60
875.3
86.9
KC1, 5C freeze
27.93
5.34
0.53
774.5
76.8
KC1, 10C freeze
22.82
4.36
0.43
632.9
62.6
Note: The 16% no freeze and 16% freeze were retested because of
excessive spread of test results.
Mortar bond strength according to ASTM Set Avg (ASTM)
Comp.
Tens.
Comp.
Tens.
Resisting bond
bond
bond
bond
moment strength strength strength strength
Moist %
(kgf-m) (MPa) (MPa)
(psi)
(psi)
16%, no freeze
18.71
3.58
0.35
519.0
51.2
16%, no freeze
14.6
2.79
0.27
405.1
39.9
16%, no freeze
9.71
1.86
0.18
269.6
26.3
16%, no freeze
9.71
1.86
0.18
269.6
26.3
16%, no freeze
9.71
1.86
0.18
269.6
26.3
16%, freeze
18.71
3.58
0.35
519.0
51.2
16%, freeze
12.2
2.33
0.23
338.6
33.2
16%, freeze
12.2
2.33
0.23
338.6
33.2
16%, freeze
13.4
2.56
0.25
371.9
36.5
16%, freeze
12.8
2.45
0.24
355.2
34.9
10%, freeze
4.98
0.96
0.09
138.6
13.2
10%, freeze
13.88
2.66
0.26
385.2
37.9
10%, freeze
13.4
2.56
0.25
371.9
36.5
10%, freeze
14.48
2.77
0.27
401.8
39.5
10%, freeze
8.67
1.66
0.16
240.8
23.4
8%, freeze
6.18
1.18
0.11
171.8
16.5
8%, freeze
8.97
1.72
0.17
249.1
24.3
8%, freeze
10.74
2.06
0.20
298.2
29.2
8%, freeze
6.78
1.30
0.13
188.5
18.2
8%, freeze
8.67
1.66
0.16
240.8
23.4
6%, freeze
6.78
1.30
0.13
188.5
18.2
6%, freeze
6.78
1.30
0.13
188.5
18.2
6%, freeze
15.47
2.96
0.29
429.2
42.3
6%, freeze
16.67
3.19
0.31
462.5
45.6
6%, freeze
8.25
1.58
0.15
229.2
22.3
KC1, no freeze
33.03
6.31
0.63
915.8
90.9
KC1, no freeze
33.1
6.33
0.63
917.7
91.1
KC1, no freeze
34.7
6.63
0.66
962.0
95.5
KC1, no freeze
30.11
5.76
0.57
834.9
82.8
KC1, no freeze
26.92
5.15
0.51
746.5
74.0
KC1, 5C freeze
26.92
5.15
0.51
746.5
74.0
KC1, 5C freeze
29.34
5.61
0.56
813.5
80.7
KC1, 5C freeze
26.92
5.15
0.51
746.5
74.0
KC1, 5C freeze
31.85
6.09
0.60
883.1
87.6
KC1, 5C freeze
24.6
4.70
0.47
682.2
67.6
KC1, 10C freeze
23.45
4.48
0.44
650.3
64.4
KC1, 10C freeze
20.18
3.86
0.38
559.7
55.3
KC1, 10C freeze
20.18
3.86
0.38
559.7
55.3
KC1, 10C freeze
28.25
5.40
0.54
783.3
77.7
KC1, 10C freeze
22.03
4.21
0.42
611.0
60.4
31
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