Table A18. Chemical composition of admixtures tested in Phase 1, Task Gc.
Mix
Dosage
no.
Antifreeze admixture formulation
(% CWT)
w/c Ratio
Remarks
1
Control
0
0.42
Normal plasticity.
2
Ca(NO2)2 /propylene glycol
3/3
0.39
Normal plasticity.
Urea/Ca(NO2)2
1.5/4.5
0.42
Less plastic than previous mix.
3
4
Urea/Ca(NO2)2
4.5/1.5
0.42
Very soft mix; little bleeding.
5
Ca(NO2)2 /cane sugar
6/0.4
0.42
Rapid set.
Ca(NO2)2 /cane sugar
9/0.4
0.42
Excessive rapid set.
6
7
Ca(NO2)2 /cane sugar + microsilica (25%
cement substitution)
6/0.3
0.45
Too-rapid set.
8
K2CO2 /cane sugar
6/0.4
0.42
Normal plasticity kept by remixing at intervals.
9N/A N/A
N/A
10
N/A
N/A
N/A
11
N/A
N/A
N/A
12
N/A
N/A
N/A
13
N/A
N/A
N/A
14
N/A
N/A
N/A
15
N/A
N/A
N/A
16
N/A
N/A
N/A
17
N/A
N/A
N/A
18
N/A
N/A
N/A
19
N/A
N/A
N/A
20
N/A
N/A
N/A
Table A19. Compressive strength. Task 1H cured at various temperatures.
b. 5C.
a. 20C.
Compressive strength (psi)
Compressive strength (psi)
Testing age (days)
Testing age (days)
Mix no.
7
14
28
Mix no.
7
14
28
1
231
254
478
1
5550
6088
6681
2
2947
4249
5022
2
N/A
N/A
N/A
3
1912
3150
4186
3
N/A
N/A
N/A
4
2516
3711
4702
4
N/A
N/A
N/A
5
1723
3046
4238
5
N/A
N/A
N/A
6
2964
4183
5043
6
N/A
N/A
N/A
7
2098
3442
4385
7
N/A
N/A
N/A
8
N/A
N/A
N/A
8
N/A
N/A
N/A
9
N/A
N/A
N/A
9
N/A
N/A
N/A
10
N/A
N/A
N/A
10
N/A
N/A
N/A
11
N/A
N/A
N/A
11
N/A
N/A
N/A
12
N/A
N/A
N/A
12
N/A
N/A
N/A
13
N/A
N/A
N/A
13
N/A
N/A
N/A
14
N/A
N/A
N/A
14
N/A
N/A
N/A
15
N/A
N/A
N/A
15
N/A
N/A
N/A
16
N/A
N/A
N/A
16
N/A
N/A
N/A
17
N/A
N/A
N/A
17
N/A
N/A
N/A
18
N/A
N/A
N/A
18
N/A
N/A
N/A
19
N/A
N/A
N/A
19
N/A
N/A
N/A
20
N/A
N/A
N/A
20
N/A
N/A
N/A
36
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