New high-performance water proof admixture VF-7
Category
Naphthalene series
Detail
Applications
VF-7 has the effect of delayed coagulation, when it mixed use with other admixture, test must be done to confirm the validity.
When VF-7 is first used, it must be mixed according to above introduction in the testing laboratory.
Properties
Dosage: 1.5~3.5%, water-reducing rate: 13-26%.
The same cement water ratio with VF-7 can improve incipient slump constant of concrete 10cm above,and it is suitable for transporting goods concrete at long bowls.
Greatly improved the workability、moisture retention、cohesiveness of VF-7, and can reduce pipeline pressure when pump.
There is delayed coagulation in initial set, can reduce the early rate of exothermic reaction during hydration and be favorable to pour concrete in mass.
To improve and change the pressive strength、rupture strength、tensile-strength、impermeability、lasting quality of concrete.
VF-7 applies to concrete work under the condition of -5℃-40℃.
Impervious gradation of mortar can be P8-P10, impervious gradation of C30 concrete can be P14. The highest impervious gradation of concrete can be P40.
VF-7 cannot be used with naphthalene based water reducing admixture.
Experiment must be done when VF-7 is used together with other admixtures.
Uniformity
Item |
Results |
Item |
Results |
Appearance |
Tan liquid |
pH Value |
7-9 |
Density (20℃) |
1.17±0.02 g/ml |
Chloride ion (%) |
≤0.6% |
Cement paste fluidity(mm) |
≥210 |
Cement paste invariability |
Pass |
Concrete performance with 2.0% dosage by binder mass
Test item |
Quality index |
Results |
||
I |
II |
|||
Cement paste invariability |
pass |
pass |
pass |
|
Ratio of bleeding rate (%), ≤ |
50 |
70 |
0 |
|
Difference in setting time(min) |
Initial setting |
-90 |
-90 |
+66 |
Ratio of compressive strength (%), ≥ |
3d |
100 |
90 |
157 |
7d |
110 |
100 |
154 |
|
28d |
100 |
90 |
132 |
|
Permeated height rate (%), ≤ |
30 |
40 |
19 |
|
Moisture pickup rate(%), ≤ |
48h |
65 |
75 |
46 |
Ratio of shrinkage(%),≤ |
28d |
125 |
135 |
112 |
Conclusion: the project is in line with acceptable end product index of “Water-repellent admixture” in JC474-2008.
Packaging, Transport and Storage
VF-7 is available in metal pail or iron tank. Other special package can also be available according to prior consultation.
VF-7 must be stored at the temperature above 0℃. Special measures should be taken to ensure entire package.
Dry and well ventilated warehouse is needed for storage. Quality guarantee of VF-7 is one year under normal conditions. If storage has surpassed the time, test must be done to confirm the validity.
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