Elimination of seepages using hydroactive resin injection

1 . The Chemistry of Polyurethanes

Polyurethanes are well-known in our daily lives, and can be grouped as follows:

 - Rigid and flexible foams;
 - Solid resins.

 The main uses of foams are:

 - Rigid foam: thermal insulation, etc.
 - Flexible foam: mattresses, etc.

 Solid resins are used in coatings and electrical insulation. 

 In practice, polyurethanes are differentiated by one or two components.

 Polymerisation results from a polyol-isocyanate reaction, with the polyol being the dominant ingredient. The polyol chosen depends on the product's properties.

 By changing the chemical structure of the two components, it is possible to get hydrophilic or hydrophobic polyurethanes, in the form of either foam (rigid or flexible) or gel.

 The reaction with water occurs through hydrogen atoms, which react with the isocyanate forming amine and CO2.

 All hydroactive resins are polyurethane prepolymers, liquid and with low viscosity.

 When the hydroactive resin comes into contact with water (even if it is just damp), it reacts and forms CO2 and a undergoes a large expansion.

 Once this expansion is complete, the solution solidifies and becomes rigid or flexible, in a stable and durable state.

2. Main Properties

 - It is not affected by microorganisms;
 - It is not diluted or affected by water or by a large number of chemicals;
 - It is totally neutral, tasteless and atoxic (approved for use with drinking water);
 - One of the main advantages of these mixtures is the ease of application;
 - They can be pumped with a manual or electric pump, depending on the required volume and pressure.

3. Main types and applications:

 Hydroactive resin for waterproofing and sealing - semi-flexible (SPETEC PU H100): 

 - Elimination of seepage and leaks in concrete, masonry, and sandy soils
 - Concrete or segment joint sealing

Hydroactive resin for waterproofing and sealing - flexible (SPETEC PU F400):

 - Elimination of seepages and leaks in concrete, masonry, and sandy soils
 - Elimination of water leaks in pipes, manholes
 - Elimination of water leaks in foundations
 - Expansion joint sealing
 - Concrete or segment joint sealing 

Hydroactive resin for ground stabilisation (SPETEC PUR H40): 

 - Ground stabilisation in water soaked strata
 - Creation of excavation protection barriers
 - Consolidation of foundations

Hydroactive gel for sealing (SPETEC GT 1100):

 - Sealing of cracks in dry and damp substrates
 - Elimination of seepages in manholes
 - Pipe joint sealing
 - Stabilisation of ground with water