Grouting fluids come in different types, each designed for specific applications. Below are two commonly used grouting products and their features:

1. Oily Polyurethane Grout

An oil-based, high-performance waterproof material ideal for coal mine leak plugging and other dry environments.

• Efficient Leak Plugging: Rapidly reacts with water, expands, and solidifies to form a dense waterproof layer.

• Super Bonding: Strong adhesion to concrete, rock, and other surfaces, ensuring long-lasting waterproofing.

• Corrosion Resistance: Resists acids, alkalis, and salts, making it suitable for complex water conditions.

• Easy Application: Excellent fluidity, simple injection process, non-toxic after curing, and environmentally friendly.

2. Water-Based Polyurethane Grout

Best suited for tunnels, subways, dams, and wet environments due to its water-based composition.

• Low Viscosity: Quickly reacts with water, expanding to form an elastic waterproof layer.

• High Expansion Rate: Highly elastic, with minimal shrinkage, ideal for high-pressure single-liquid grouting machines.

• Strong Adhesion & Chemical Resistance: Bonds well to substrates and is safe for use in drinking water areas.

Usage Scenarios & Suitability

• Water-based polyurethane grout is ideal for wet environments and areas with significant water exposure.

• Oily polyurethane grout is recommended for drier environments due to its solvent-based composition.

Usage & Application Steps

Preparation:

1. Select the appropriate grouting fluid based on construction requirements.

2. Pour the grouting solution into a specialized grouting device, following the product manual.

3. Inspect the leakage area and clean any dirt or debris before starting.

Construction Steps:

1. Drilling: Determine drill hole locations based on leakage patterns, with a hole spacing of 20–50 cm.

2. Install Water-Stop Needles: Securely place the water-stop needle inside each borehole.

3. Pre-Grouting: Inject clean water into cracks to observe leakage points and repair them using a sealing compound.

4. Formal Grouting:

   • Use a hydraulic pressure grouting machine to inject grout from top to bottom.

   • When grout starts flowing from adjacent holes, maintain pressure for 3–5 minutes before moving to the next hole.

5. Hole Sealing: Once grouting is complete, cut off excess nozzles and seal holes with cement mortar or plugging compound.

Important Notes:

• After construction, ensure proper maintenance of the waterproof layer.

• Wear protective equipment to prevent direct skin contact. If exposed, rinse immediately with plenty of water.