Influence of Air Temperature on the Performance of Different Water-Reducing Admixtures with Respect to the Properties of Fresh and Hardened Mortar
Table 2
Test results.
Admixture active ingredient
Admixture dosage (% w.c.)
Temperature
Sand mix/cement (kg/kg)
Air content (%)
Initial setting time (h)
Compressive strength(MPa)
L
0.13
2.22
2.18
1.99
1.6
1.6
2.5
8.9
4.6
4.7
29.7
30.9
29.9
0.26
2.56
2.53
2.38
2.2
2.5
1.3
18.4
8.6
8.5
32.5
30.6
32.2
0.40
2.75
2.80
2.77
4.4
2.7
3.1
32.8
15.2
16.5
31.3
30.9
29.5
N
0.24
2.26
2.34
2.25
0.9
1.2
0.7
5.3
2.8
2.9
28.5
28.2
0.32
2.50
2.53
2.58
1.9
1.1
0.9
5.6
3.0
2.9
28.8
28.3
0.40
2.78
2.86
2.87
1.6
2.0
1.6
5.6
2.9
3.0
25.6
27.0
28.2
P
0.03
2.10
2.34
1.95
1.0
1.2
0.8
4.8
2.8
2.1
28.6
28.3
29.0
0.06
2.88
2.71
2.77
4.5
3.9
3.8
7.8
4.4
4.8
27.3
27.9
27.2
0.09
3.20
3.26
3.14
5.7
4.7
2.7
9.8
3.5
2.9
27.6
27.5
26.5
For each case, the compressive strength of both specimens was assessed and the higher of the two values obtained was considered to be the actual compressive strength value, which is indicated here in each cell. The test was not carried out due to the problems that occurred when unmolding the specimens.
