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| 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 | ||
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 | |
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.
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