VPU-1 Single Component Waterbrone Hydrophilic Polyurethane Grouting
Materials for
Waterproof Plugging and Reinforcement Repair of Concrete Leakage
Introduction
VPU-1 is a common one-component hydrophilic polyurethane grouting
material. The composite
polyether polyol reacts with the polyisocyanate to form a
hydrophilic chemical grouting material
terminated by isocyanate. It reacts rapidly with water, solidifies
and expands the closed crack,
thereby achieving Quickly stop the water. This product is milky white elastic colloid after reaction
with water. It has the advantages of high speed, high strength, small shrinkage and strong
impermeability. It is widely used in waterproof tunneling projects such as subway tunnels, water
conservancy and hydropower, underground garages and sewers.
Characteristics
1.Low viscosity, quick reaction in water, forming impervious
elastic colloidal concretion body by
reaction with good water sealing performance.
2.Reacting with water, it forms ivory elastic colloidal concretion
body, which has the advantages
of high compressive strength,low temperature resistance,good elasticity and penetration proof
quality.
3.Good effect on mixing with water. The product can penetrate into
crack deeply and the crack can
be sealed thoroughly by concretion body.
4.Good dilatability,big water content ,good water affinity and
groutability,meanwhile the viscosity and
curing speed can be adjusted according to customer's requirement.
5.It can be widely used in waterproof projects such as DAMS,
subway, tunnel etc.
Product Parameters
| No. | Item | Test |
| 1 | Appearance | Light Yellow Transparent Liquid |
| 2 | Density/g/cm3 | 1.0-1.2 |
| 3 | Viscosity /mpa.s | 150-350 |
| 4 | Gel Time /s | 10-100 |
| 5 | Solid Content /% | 75-90 |
| 6 | Foaming Capacity/% | 500-1000 |
| 7 | Expansion Rate with Water/% | 20-30 |
| 8 | Water Absorption Capability /10 Times of Water , s | 20-70 |
| Remark: a Agreed by both customers&supplier; b Item tested
while reinforcement requirement |
PU Grouting Materials Type
| Item | VPU-2
Hydrophobic PU Grouting Materials | VPU-1
Hydrophilic PU Grouting Materials |
| Characteristic | High Foaming Rate,Good Stability. And Fast Speed | 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 water flow, 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
durable repair 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
