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1. Product Introduction
A Silent Expanding Agent is a highly effective type of non explosive demolition agent used for the controlled breaking of rock and concrete. Technically classified under chemical demolition agents, this material expands upon hydration to generate pressures exceeding 50-120 MPa, fracturing hard materials without the need for traditional blasting.
As a primary solution for quiet construction equipment operations, it allows for high-efficiency demolition in vibration-sensitive environments such as urban centers, hospitals, and heritage sites.
1.1 Key Application Areas:
Structural Demolition: Precision removal of bridge piers, foundations, and reinforced concrete walls.
Mining & Quarrying: Stone splitting in marble or granite quarries where material preservation is critical.
Road Repairs: Tunneling and infrastructure maintenance with zero traffic disruption from noise or vibration.
2. Packaging and Storage
Packaging: This product is shipped in moisture-resistant packaging to ensure the stability of the chemical demolition agent.
Environment: Store in a dry, cool, and well-ventilated area, avoiding direct UV exposure and moisture.
Temp Control: Keep storage temperatures between 5℃ and 35℃ to maintain the chemical potency.
Safety: Store away from flammable materials and out of reach of unauthorized personnel.
3. Instructions for Use
3.1 Technical Preparation
Confirm all operators are equipped with safety goggles, rubber gloves, and dust masks.
Drilling Protocol: Use a rock drill (like the Expandag YT28) to create holes. Diameter must be between 32mm and 45mm. Ensure holes are clean and dry.
3.2 Operational Steps
Mixing: Combine the Silent Expanding Agent with clean water at a ratio of 28% - 32% (approx. 1.5L water per 5kg powder). Stir thoroughly until a smooth slurry is formed.
Injection: Fill the pre-drilled holes immediately after mixing. Ensure the slurry occupies the entire volume of the hole.
Waiting Time: Allow the agent to cure for 2 to 24 hours. Reaction speed is dependent on the ambient temperature and the hardness of the rock/concrete.
Fragmentation: Once the internal stress exceeds the material's tensile strength, cracking will occur. Broken sections can then be removed using standard quiet construction equipment.
4. Safety Precautions
Warning: Never look directly into filled holes within the first 6 hours of application. Sudden hydration can lead to steam-driven "blow-outs."
Skin/Eye Contact: In case of contact, flush with clean water for at least 15 minutes and seek medical advice.
Ventilation: Always ensure proper airflow when operating in tunnels or confined urban sites.
5. Troubleshooting
If fragmentation is not achieved as expected, please verify the following factors:
Hole Diameter: Drilling holes smaller than 32mm or larger than 50mm may reduce expansion effectiveness.
Water Temperature: In high-ambient heat, use chilled water to prevent premature reaction.
Hole Spacing: Ensure hole spacing is calibrated based on the density of the material being broken.
6. Contact & Technical Support
For bulk orders or technical consultation on non explosive demolition agents, please contact us:
Customer Support: 0086 18978406522
Email: [email protected]
Website: www.expandag.com
Silent Expanding Agent FAQs & Technical Troubleshooting
Q1: How do I calculate the exact dosage of Silent Expanding Agent needed?
A: The consumption depends on the borehole diameter and spacing. For a standard 38mm-40mm hole, you typically need 1.5kg to 1.7kg of agent per linear meter. To avoid material waste, we recommend using our professional Dosage Calculator for a precise project estimate.
Q2: Why is temperature selection critical for non explosive demolition agents?
A: Reaction speed is highly sensitive to ambient temperatures. Using a low-temp grade in hot weather can cause rapid expansion leading to a "blow-out." Always match the product grade (SCA-1, 2, or 3) to your local site conditions.
Q3: Can this chemical demolition agent break heavily reinforced concrete?
A: Yes. For reinforced concrete, the Silent Expanding Agent fractures the concrete surrounding the rebar. To ensure success, reduce the hole spacing (typically 15cm-25cm) to overcome the additional tensile strength of the internal steel mesh.
Q4: What are the primary causes of a "blow-out" (steam eruption) from the hole?
A: Blow-outs usually occur due to warm mixing water, hole diameters exceeding 50mm, or using the incorrect product grade for the current ambient temperature. Always use cool, clean water.
Q5: Is a permit required to use Silent Expanding Agents in urban zones?
A: In most jurisdictions, no explosives license is required. This makes it the preferred quiet construction equipment solution for projects near hospitals and residential areas where traditional blasting is prohibited.
Q6: How should the product be stored to maintain its 120 MPa expansion pressure?
A: Keep in original moisture-proof vacuum packaging until the moment of use. Store in a cool, dry warehouse. Once opened, exposure to humidity will reduce the final expansion pressure.
Need a Customized Technical Solution?
Contact Expandag engineers today for project-specific borehole designs and wholesale pricing.
