PU Grouting Material For Tunnel Repair of Concrete Base

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

The Difference Between VPU-1 And VPU-2

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