Polyurethane (PU) injection grouting is a waterproofing method that involves the injection of polyurethane, a waterproofing resin, under high pressure into the cracks, joints or voids in the concrete structure. It is a cost effective and fast approach to repairing water leakages that occur as a result of structural faults. There are certain steps involved in the process of polyurethane injection grouting and it is important to deploy skilled labour to handle grouting because many of the steps involved require years of experience in order to execute properly.
There are two different types of polyurethane grouts: hydrophobic and hydrophilic. Each type of polyurethane grout has their own set of benefits and it is especially important to understand the nature of the concrete to be repaired and the appropriate type of grout to use. Once you have understood the nature of repair, you can choose the right type of material (in this case, the grout) to be used. Using the wrong type of material can lead to pre-mature failure of the repair.
Polyurethane injection grouting involves the steps of:
1. Drilling
2. Inserting injection ports
3. Pressured grouting using polyurethane resin
4. Reinstating cored holes
If properly carried out, the cured polyurethane grout can remain strongly bonded to the concrete structure for many years and prevent future water leakages. It is very important to ensure that the polyurethane grout has fully filled up the entire length of the crack or void.
Polyurethane injection grouting is an effective solution to rectify water leakages through concrete structures. It can also be very quickly carried out, usually not more than 1 day to repair a leakage. It is also a lot cleaner and less messy as compared to the hacking approach. Therefore high pressure polyurethane injection grouting is a preferred method of repair for people who seek a cheaper, faster, less messy and reliable method of repair for their water leakages through concrete.