Chemical bonding agent for new concrete on old concrete

When applying new concrete to old concrete, it's essential to use a chemical bonding agent to ensure a strong and durable bond between the two surfaces. Here are some common chemical bonding agents used for this purpose:

  1. Latex-based bonding agents: These are the most commonly used bonding agents for concrete-to-concrete bonding. They are water-based, non-toxic, and easy to apply. Examples include:
    • SikaBond (Sika Corporation)
    • Loctite PL Premium (Henkel Corporation)
    • Liquid Nails (Henkel Corporation)
  2. Epoxy-based bonding agents: These are more expensive than latex-based agents but offer better bonding strength and durability. They are typically used for high-stress applications or in areas where the old concrete is heavily damaged. Examples include:
    • SikaBond Epoxy (Sika Corporation)
    • 3M Scotch-Weld (3M Corporation)
    • Loctite Epoxy (Henkel Corporation)
  3. Acrylic-based bonding agents: These are a newer generation of bonding agents that offer improved bonding strength and flexibility. They are often used for large-scale construction projects or in areas where high-traffic is expected. Examples include:
    • SikaBond Acrylic (Sika Corporation)
    • Mapei Ultrabond (Mapei Corporation)
    • Bostik Bonding Agent (Bostik Corporation)
  4. Silane-based bonding agents: These are used to improve the bonding between old concrete and new concrete, especially in areas where the old concrete is porous or has high water absorption. Examples include:
    • SikaSilane (Sika Corporation)
    • Mapei Silane (Mapei Corporation)
    • Bostik Silane (Bostik Corporation)

When selecting a chemical bonding agent, consider the following factors:

  1. Compatibility: Ensure the bonding agent is compatible with both the old and new concrete.
  2. Bonding strength: Choose a bonding agent with a high bonding strength to ensure a strong bond between the two surfaces.
  3. Durability: Select a bonding agent that can withstand the expected environmental conditions and traffic.
  4. Ease of application: Consider the ease of application, including the mixing ratio, application method, and drying time.
  5. Cost: Balance the cost of the bonding agent with the expected benefits and durability of the bond.

Remember to always follow the manufacturer's instructions for application, mixing, and curing times to ensure a successful bond.