Cracking Concrete Problems

Cracks in pavements occur for many reasons including initial shrinkage, evaporation of surface water, uneven supports with heavy loads, and thermal movements. 

Many of these situations can present opportunities for repair that will perform well over time.

One proven method of repair cracks is by the use of carbon fiber stitches (crackstiching), and the use of low viscosity polyurethane.  Modern Urethanes can reach high strengths and be flexible or rigid. 

Carbon fiber has been used in everything from the Space Shuttle to the Boeing 777 Dreamliners. These materials have made their way in to mainstream construction and are creating numerous benefits.

Floor Stitching

crack repair azBy utilizing pre-cured carbon fiber stitching systems used to bridge shear forces, we can solve cracks in floor slabs. The systems are installed at a fraction of the cost of traditional steel dowels and with less heavy equipment and disruption to the homeowner.

Arizona Foundation Solutions has become certified applicators for HJ3 Composites and is the preferred applicator for the Greater Phoenix Region of Arizona. HJ3 is one of the world leading authorities on the use of these materials in the construction environment.

We cut stitches into your cracked concrete, drop carbon fiber laminates into the cuts and adhere with low viscosity polyurea. This system is stronger, faster and more cost effective than the more traditional embedment of rebar dowels into the concrete.

Traditional stitching involves cutting 2 parallel slits perpendicular to the crack, inserting a rebar dowel and filling with epoxy.  By cutting one stitch and inserting a flat slat of carbon fiber we can achieve the following advantages:

  • Stronger: The carbon fiber laminate is much stronger than the rebar dowel
  • Less invasive: less cutting, chipping and patching
  • Less material use.  Only a small area on each side of the carbon fiber
  • Faster

The following is an illustration of the stitching process.

The problem area

Step 1 - Cut crack in non-parallel cuts

Step 2 - Install super high strength carbon fiber laminate

Step 3 - Fill cracks and around carbon fiber slits with super low viscosity polyurea. 

Step 4 - Grind the area smooth

The final look