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Overview and Application Technology of Expansive Mortar Powder
💡 Key Takeaway: Expansive Mortar Powder is a specialized chemical agent that safely fractures hard rock and reinforced concrete through hydration-induced pressure (>120 MPa). It is the premier choice for urban demolition and precision quarrying where explosives are strictly prohibited.
Also known in the industry as a Non-Explosive Demolition Agent (NEDA) or Stone Cracking Powder, this material has revolutionized how we handle vibration-sensitive engineering projects. By eliminating flying rocks, toxic gases, and deafening noise, it protects both site personnel and surrounding infrastructure.
Furthermore, in dimension stone mining (granite, marble, and jade), expansive mortar significantly increases the block yield rate compared to traditional dynamite, preventing micro-fractures that destroy valuable materials.
Solving the Industry's "Slow Reaction" Problem
A common issue contractors face with low-grade cracking agents is unpredictable reaction times—sometimes taking over 48 hours or failing completely in changing weather. To solve this, Expandag (Topking) has developed an advanced Expansive Mortar Powder formula that provides rapid, quantitative cracking regardless of the season.
By strictly categorizing our powders into specific temperature grades, we guarantee a controlled expansion pressure exceeding 120 MPa across all environments.
| Product Grade | Ambient Temperature | Application Season |
|---|---|---|
| HSCA-1 (Type I) | 25°C to 40°C | Summer / Tropical Climates |
| HSCA-2 (Type II) | 10°C to 25°C | Spring & Autumn / Standard |
| HSCA-3 (Type III) | -5°C to 10°C | Winter / Cold Regions |
Standard Application Technology (SOP)
Borehole Design: Analyze the rock structure to ensure at least one "free face" is available for the rock to expand towards. Use a pneumatic rock drill to create holes (typically 34mm to 45mm in diameter).
Dosage Estimation: Never guess your material volume. Use the professional Expandag Dosage Calculator to determine exactly how many bags you need based on your hole layout.
Mixing & Filling: Mix the powder with clean, cool water (approx. 28-30% water ratio) to form a fluid slurry. Pour the mixture directly into the boreholes. Crucial step: complete the pouring process within 5 to 10 minutes of mixing to preserve expansive energy.
Safety Precautions & Storage
Blow-out Prevention: Operators must wear safety goggles and hard hats. Never look directly into filled boreholes for the first 6 hours to prevent injury from accidental steam eruptions (blow-outs).
Alkaline Protection: The slurry is highly alkaline. If it splashes into the eyes or on the skin, flush immediately with large amounts of clean water and seek medical attention. Always wear heavy-duty rubber gloves.
Packaging & Storage: Expandag powder is vacuum-packed in 5kg plastic bags inside a 20kg carton. It must be stored in a dry, ventilated area. Under proper moisture-proof conditions, the shelf life is 12 months.
Application FAQs: Expansive Mortar Powder
Q1: How much expansive mortar powder do I need for my project?
A: Consumption varies heavily based on rock hardness and borehole diameter. On average, it requires 1.5kg to 2.0kg per linear meter of drilling. To get a precise estimate and avoid waste, use our online dosage calculator.
Q2: What is the optimal hole diameter for expansive mortar?
A: The industry sweet spot is between 34mm and 45mm. Holes smaller than 30mm will not hold enough slurry to generate sufficient heat and pressure, while holes larger than 50mm significantly increase the risk of steam blow-outs.
Q3: Can I use this chemical powder in wet or underwater conditions?
A: Yes, but the powder must not be diluted by ground water. For underwater or heavily water-seeping boreholes, you must use the powder packaged in specialized plastic cartridges (sausages) to ensure the chemical reaction remains isolated.
Q4: What happens if I use the Summer grade (HSCA-1) in Winter?
A: The reaction will stall. High-temperature grades are designed to slow down the reaction in hot climates. If used in freezing temperatures, the chemical will not generate enough heat to crack the rock. Always strictly follow the temperature selection chart.
Q5: What is the exact shelf life of the stone cracking powder?
A: When stored indoors in its original, unopened vacuum packaging, the shelf life is 1 year (12 months). Exposure to humidity will cause the powder to absorb moisture from the air, prematurely destroying its expansive capability.
Q6: What should I do if the mixed slurry starts getting hot in the bucket?
A: If the slurry begins to steam or heat up rapidly in the bucket, do not pour it into the boreholes, as a blowout is imminent. Discard it in an open, safe area. This usually happens if you mix too much powder at once or take longer than 10 minutes to pour.
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