Structural Crack Repair
Epoxy Injection

:: STRUCTURAL CRACK REPAIR

Semi-flexible and flexible sealants are usually the best solution for crack and joint related problems. Nevertheless there are conditions where structural repair is necessary and specified.

Structural strength is achieved by using epoxy injection resins. Due to the unique properties of slv (super low viscosity) and other epoxy injection resins, it is possible to inject this resin deeply into concrete joints, hairline cracks and fissures.

Epoxy resins provide very high bond and compressive strength, and can restore cracked concrete to a complete monolithic piece. Depending on the job, injection can be done with low pressure and high pressure systems. Low pressure systems commonly utilize 'glue on' surface ports. High pressure injection is characterized by the use of mechanical packers. The low pressure injection method is more popular in epoxy resin injection and usually achieves good results.

Although most epoxy injection can be performed with single component polyurethane injection equipment, it is recommended to use specialized epoxy injection gear to meet the specific material properties.

Since the premixed epoxy reacts within a certain gel-time just by itself, it is advised to use two-component pumps with a static mix head to prevent premature reaction in the pumping system.

While small batches of premixed material can be closely observed, it is essentially impossible to prevent mishaps and premature curing on the larger scale of a complex job. The two-component set up will give the contractor peace of mind and less aggravation when cleaning the system.

The components are completely separated before mixing in the static mixer, therefore the pump and pressure hoses require less cleaning maintenance. The delivery lines from the mixer have to be flushed, and the mixer itself can be easily replaced if necessary.


:: ADVANTAGES OF THE EPOXY INJECTION SYSTEM

• Negative side application possible
  
• Deep penetration into very small cracks
  
• Medium or short gel time
  
• Bond to moist surfaces
  
• Underwater injection approved
  
• High structural strength
  
• Inert after curing, constant volume, no shrinkage
  
• Tolerate unavoidable debris
  
• Approved for contact with potable water
  
• Easy to handle
  
• Tolerant to mixing variations and field conditions