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High performance non-shrinkage prestressed duct grouting agent (VF-17)
Applications
When VF-17 is used for duct grouting of inherent stress, cement water factor (proportion by weight) is about 0.33. According to the different grouting position, cement water factor can be adjusted (please consult engineering department).
At the time of mix, in accordance with the provisions of the ratio to add mixing water in order (Can not use water, salt water and contaminated water, and chlorine and other harmful substances can not be exceeded.)
Use stirring mill of cement paste for mixing and duration of mixing shouldn’t be less than 3-5 minutes.
Before perfusion, grout should be stirred continuously for keeping its uniformity and fluidness.
Slurry must be used up within 45 minutes.
At the time of perfusion, injection pressure of force pump should be more than 0.7MPa, as vacuum grouting, Pressure can be adjusted according to experiments.
Properties
Depend on the use of different parts, the fluidness can be adjusted within 18±4 seconds. To choose the right fluidness so that slurry within pore canal has higher filling degree.
Easy to use and longer working hours (setting time can be adjusted according to need).
Before coagulating, it has a little bit of expansion character, but there is no shrinkage performance and expansion character after coagulating.
VF-17 has anticorrosion performance of steel rods.
VF-17 has high strength and bonding force.
VF-17 has excellent stability of slurry.
VF-17 is environment-friendly products.
Usage
Duct grouting of inherent stress post-tensioning beam
Anchor grouting of ground anchor
For the main technical performance, please see the following form
|
No. |
Inspection item |
Unit |
Quality index |
Result |
|
|
01 |
Setting time |
Initial setting |
h:min |
≥4 |
9:18 |
|
Final setting |
≤24 |
10:22 |
|||
|
02 |
Fluidness |
Initial Fluidness |
s |
18±4 |
18 |
|
30min Fluidness |
≤30 |
22 |
|||
|
03 |
Bleeding rate |
24h Free Bleeding rate |
% |
0 |
0 |
|
3h Bleeding rate |
≤0.1 |
0 |
|||
|
04 |
Pressurized ratio of bleeding rate |
0.22MPa（When vertical height of pore canal is ≤1.8m） |
% |
≤3.5 |
2.0 |
|
05 |
Filling degree |
—— |
Pass |
Pass |
|
|
06 |
7d |
Breaking strength |
MPa |
≥6.5 |
10.0 |
|
Pressive strength |
≥35 |
58 |
|||
|
07 |
28d |
Breaking strength |
MPa |
≥10 |
12.5 |
|
Pressive strength |
≥50 |
65 |
|||
|
08 |
24h free swelling ratio |
% |
0-3 |
0.2 |
|
|
09 |
Reinforcement corrosion hazard |
—— |
None |
None |
|
|
10 |
Air content |
% |
1—3 |
1.3 |
|
|
11 |
Chlorine ion content（gross gelled material） |
% |
≤0.06 |
0.04 |
|
Remark：
1. At the time of test, dosage of mud jacking power is 10% of cement consumption and the ratio of water and materials are 0.32.
2. According to the index of TB/T3192-2008.
Packaging, transport and storage
Powder VF-17 is available in 25kg film-lined bags. Other special package can also be available according to prior consultation.
Special measures should be taken to ensure entire package. Keep waterproof during transportation. Dry and well ventilated warehouse is needed for storage.
Do not directly place in the concrete floor, it should be stored on wooden pallets or overhead shelf. Quality guarantee of VF-17 is three month under normal conditions. If storage has surpassed the time, test must be done to confirm the validity.