Products

ECB

Conpro Start

Conpro Primer

• Cracking can result because of
  inconsistent adhesion to the substrate
  due to unequal stress.
  A hollow sound in the repair area
  usually means there is delamination. 
   
• To determine the cause of failure,
  look on the back of the repair material
  that has been removed or has fallen out.
  A dusty surface (dust/dirt that was not
  properly cleaned from the repair zone)
  or some of the substrate (parent material)
  indicates the cause of failure. 
   
• The shape of repair is important.
  Repairs should always be square or
  rectangle and a minimum of 1/4 inch deep.
  Long, narrow repairs have a much greater
  tendency to crack than even sided
  (square) repairs. 
   
• Mechanical bond of a fresh material
  to hardened concrete is dependent on
  the surface profile. A rough surface is best. 
   
• ICRI Surface Preparation Guide 03732
  is an excellent reference guide to
  proper surface preparation.

• Good surface preparation is critical for
  durable repairs. When a repair mortar is placed
  on a dusty or dirty surface it will bond to the dust.
  This is not good! Make sure the surface is
  clean of all contaminants including oils, sealers,
  debris, laitance, etc. and has a rough profile. 
   
• It is also very important that the surface is sound.
  A material placed on a weak or deteriorating
  surface will bond to the surface. However, there
  is a good chance that the surface will delaminate
  from itself. Always remove material until the
  surface is sound. Saturate with Conpro Start
  to strengthen surface. Conpro Start is not
  a substitute for poor surface preparation.