22.13.1. Bond with Old Concrete

Try these first

1. 1.

   What is bond strength?

   Hint

   Think about how well two materials stick together.

2. 2.

   Why is surface preparation important?

   Hint

   Consider what happens when a surface is too smooth.

3. 3.

   What is the tensile bond strength of latex-modified concrete according to the section?

   • < 1 MPa
   • > 1.5 MPa
   • > 2 MPa

   Hint

   Think about what bond strength is necessary for effective overlays.

4. 4.

   True or False: Proper surface preparation has no impact on the bond strength.

   • True
   • False

   Hint

   Remember what happens if a surface is too smooth.

5. 5.

   A new concrete overlay has failed after a few months. Identify potential reasons and suggest preventive measures.

   Hint

   Consider both preparation and environmental factors.

6. 6.

   Describe a comprehensive testing procedure to evaluate the bond strength of PMC on old concrete substrates.

   Hint

   Think about standard practices in concrete testing laboratories.