Can resin or urethane grouts be injected into running water?

This FAQ explains the use of urethanes grouts injected into running water. It focuses on the differences between hydrophobic, hydrophilic, and rigid resin types.

Manufacturers design water-activated, hydrophobic, semi-rigid urethanes, such as MME Universal Resin, for grouting in flowing water conditions. Contractors regularly use these resins for water cut-off work in underground mines, tunnels, and hydroelectric facilities.

Manufacturers also produce water-activated, hydrophilic, flexible urethanes, such as MME Flexible Resin, Contractors use them in manholes and other shallow structures. However, these resins do not perform well in high-pressure cut-off grouting in mines and tunnels. They may work for temporary applications but do not provide a reliable long-term solution.

Two-component urethanes (A/B Types), such as Multiurethanes Rigid Grout, suit relatively dry conditions. They fail to react or cure properly when contractors inject them into flowing water.

Two-component epoxies (A/B Types) also require dry conditions. They do not react correctly in running water and should not be used for water cut-off.

Engineers must also consider site conditions and grouting methods:

• If water inflow reaches 100 GPM while resin injection occurs at only 2 GPM, the grouting will fail.
• If drill holes are too shallow, the resin will not have enough time to activate and cure.

In summary, successful water cut-off in underground mining and tunneling requires careful planning. Contractors need suitable grouting equipment with enough delivery rate and pressure. They must also choose the correct water-activated, hydrophobic, semi-rigid urethane grout for the conditions. With proper preparation, engineers can achieve effective and lasting water cut-off.

For technical assistance or further information about selecting the right grouting material for chemical or cement grouting projects, please contact Multiurethanes at 1-800-663-6633, email: [email protected].