VPU-2 Hydrophobic Oil Grouting Materials for Waterproof Plugging and
Reinforcement Repair of Concrete
Introduction
VPU-2 is one component hydrophobic PU grouting material, it reacts with water and expand to be a foam
does not dissolve in the water. Not only used for waterproof
plugging, but
also with effect of reinforcement. It is widely used in subway
tunnels, water conservancy and
hydroelectric power, basement parking, sewage etc for waterproof
plugging and reinforcement projects. |  |
CharacteristicsCharacteristics
1.With good hydrophobic properties, high chemistry stability;
2.With larger Penetration radius and solidification volume ratio,
react with water quickly with large expansion
pressure, pushing the liquid to the depths of crack and expand to
form a tenacity consolidation;
3.Resistance of acid, alkali and organic solvent, better resistance
of chemical corrosion;
4.Coating smooth, wear-resisting, no mildew ;
5.Excellent adhesiveness with concrete base and other construction
materials;
6.Viscosity and cure speed can be changed according to the
requirement of projects.
Product Parameters
| 1 | Appearance | Brown Viscous Transparency Liquid |
| 2 | Density/g/cm3 | 1.10-1.2 |
| 3 | Viscosity a/mpa.s | 400-800 |
| 4 | Curing Time a/s | 300-600 |
| 5 | Solid Content /% | 85 |
| 6 | Foaming Capacity/% | 2000-3000 |
| 7 | Compressive Strength b/mpa | 8-9 |
The Difference Between VPU-1 And VPU-2
| Item | VPU-2 | VPU-1 |
| Characteristic | Hydrophobic PU Grouting Materials;High Foaming Rate,Good
Stability.And Fast Speed | Hydrophilic PU Grouting Materials;High Solid Content,High Water
Content,Low Shrinkage,Fast Speed |
| Reaction Time | 15-20 Minutes | 10-20 Seconds |
| Waterproof Features | Not Reacting with Water,Foaming, Displacing Water | Reacts With Water to Form a Solid State |
Shortcoming | The reaction speed is slower than VPU-2 and the price is relatively
higher | Long Time,Easy Evaporation of Moisture,and Easy Shrinkage of the
Tire Body |
| Advantage | No Shrinkage,Good Stability | Fast Response Speed and Relatively Low Price |
| Construction Environment | No shrinkage,Good stability | There are no restrictions on the environment,whether it's
dry,wet,or open water |
Proposal | Experienced craftsmen offline generally use water-based and
oil-based construction methods,regardless of the
environment,whether it is dry or wet,with or without visible
water,because its cost is relatively low,more stable |
PU Grouting Step
There are two main types of PU grouting methods:low-pressure
injection and high-pressure injection.The
advantage of polyurethane foam injection lies in its ability to
enable the liquid polymer to be injected into
the crack. This injection process ensures that the crack is fully
saturated with the liquid polymer until the
liquid starts to accumulate on the adjacent surface.The repair of
concrete structures is carried out by
injecting a liquid polymer that hardens upon drying. High-pressure
injection is applicable in areas where
there is a large amount of waterflow, such as basements, rooftops,
swimming pools and walkways.
First, a hole is drilled into the ceiling of the lower floor.
Then, depending on the type of ceiling structure, the PU grout is
injected through this hole using either
low or high pressure. Once the grout is injected, it will expand to
fill the voids or cracks that are caused by
water damage.Polyurethane foams are categorized into hydrophilic
and hydrophobic types.Both hydrophilic
and hydrophobic foams react with the water present in the crack.
Additionally, they can also be mixed with
water just before the injection process.A hydrophilic foam system
will trap any excess water within its
structure during the foam formation process.
Both types can be formulated to be flexible, but generally, a
hydrophilic system is more resilient compared to
a hydrophobic one.However, hydrophobic formulations have been
developed to be as resilient and flexible as
hydrophilic ones while not being prone to shrinkage over time.It is
crucial to avoid installing gels in expansion
joints or cracks that are likely to move. Gels form a solid
material without a cellular structure, which means
they cannot disperse tension under compression. This lack of tension
dispersion can cause the gel to split and
damage the seal, making it extremely difficult to repair in the long run.
In the present day, grouting will still retain its significance as
one of the simplest, most cost-efficient, and
durablerepair solutions available.
Scope of Apllication
1.Deformation Joints in Construction Projects Deformation
Cracks,Construction Joints, Structural Joints,
Plugging and Reinforcement of Structural Cracks
2.Undergound Tunnel
Subway Tunnels,Subway Platforms,Highway Tunnels,Railway Subgrade
Tunnel Walls
3 Ports and Wharves
Bridge Piers,Dams,Hydropower Station Curtain Grouting Plugging and
Reinforcement
4 Leakage Plugging by Retaining Walls in Geological Driling
Selective Water Plugging
in Oil Exploration and Water Gushing in Mines,etc.
Packaging & Storage
All Series Supporting Facilites
