APPENDIX B: PHASE I, TASK 5 CRITICAL STRENGTHS
Table B1. Critical strength results of early age concrete frozen at 20C
(4F) overnight, then cured at 20C (70F). The control concrete was
continuously cured at 20C (70F).
Mixture Age
Control at
Strength attained before freezing--MPa (psi)
2C (70F)
ID
(days)
1.7 (250)
3.4 (500)
5.2 (750)
2,0
3
23.4 (3400)
21.9 (3178)
23.9 (3461)
24.7 (3584)
7
27.4 (3973)
28.6 (4145)
27.1 (3926)
29.6 (4287)
28
32.3 (4678)
33.6 (4867)
34.0 (4928)
32.8 (4756)
2,1
3
26.0 (3765)
23.9 (3468)
24.3 (3527)
25.0 (3624)
7
32.2 (4673)
30.0 (4350)
29.1 (4225)
29.6 (4289)
28
35.2 (5100)
34.1 (4951)
34.5 (5008)
36.2 (5246)
2,2
3
26.9 (3895)
27.2 (3947)
27.4 (3975)
26.4 (3834)
7
33.8 (4907)
32.7 (4742)
33.4 (4836)
33.5 (4860)
28
39.0 (5654)
36.8 (5336)
37.3 (5411)
38.5 (5588)
2,3
3
28.5 (4131)
28.7 (4164)
28.4 (4119)
28.9 (4192)
7
34.5 (5001)
36.4 (5275)
35.4 (5135)
36.0 (5213)
28
41.4 (6005)
41.2 (5997)
41.4 (6005)
40.6 (5890)
3,0
7
32.5 (4716)
31.8 (4610)
31.8 (4605)
32.4 (4704)
14
36.9 (5348)
34.8 (5039)
36.5 (5293)
36.5 (5296)
29
37.0 (5362)
35.7 (5178)
38.4 (5574)
39.1 (5668)
3,1
7
36.4 (5279)
33.6 (4867)
35.2 (5098)
35.1 (5086)
14
37.6 (5447)
35.6 (5157)
37.5 (5435)
39.0 (5661)
29
40.5 (5875)
40.0 (5805)
41.1 (5960)
41.8 (6059)
3,2
7
40.7 (5904)
39.2 (5691)
40.4 (5857)
40.4 (5857)
14
43.2 (6260)
42.3 (6137)
43.3 (6281)
44.9 (6505)
29
45.0 (6526)
46.7 (6767)
47.5 (6884)
47.8 (6932)
3,3
7
43.9 (6369)
42.5 (6159)
42.5 (6161)
43.3 (6279)
14
45.8 (6644)
44.9 (6508)
46.8 (6779)
48.0 (6956)
29
49.1 (7120)
48.9 (7087)
49.0 (7106)
49.7 (7210)
*2,0
3
29.3 (4251)
18.7 (2714)
30.1 (4367)
28.6 (4152)
7
34.2 (4966)
33.6 (4874)
32.7 (4739)
36.3 (5270)
28
39.1 (5668)
36.6 (5308)
39.1 (5675)
39.1 (5666)
*2,2
3
31.9 (4626)
27.7 (4015)
29.4 (4265)
30.7 (4449)
7
38.6 (5590)
31.1 (4513)
33.9 (4911)
35.5 (5152)
28
41.8 (6064)
37.1 (5378)
39.5 (5732)
40.7 (5906)
* Denotes Type III cement.
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