Overview
Aggregate stone powder is a byproduct of rock crushing processes, primarily composed of finely ground limestone, granite, or other minerals. It serves as a cost-effective filler and additive in various industries due to its inert properties and fine texture. The material is graded by particle size distribution, typically ranging from 75 to 300 microns. Its quality depends on the source rock's mineral composition, with calcium carbonate-rich variants being particularly valued for construction applications.
Physical and Chemical Properties
The powder exhibits consistent physical characteristics including low moisture content (<2%) and high bulk density. Chemically, it's predominantly silica or calcium-based, depending on the parent rock, with pH values typically ranging from 7 to 9. Key performance metrics include specific surface area (1,500-3,000 cm²/g) and oil absorption value (20-35g/100g). These properties determine its suitability for different applications, with finer grades offering better workability in composite materials.
Main Applications
In construction, it's widely used as partial cement replacement (5-15%) in concrete mixes, improving workability and reducing costs. The powder also serves as base material for artificial stone production and terrazzo flooring. Industrial uses include filler in plastics and rubber manufacturing, where it enhances dimensional stability. Some specialized applications include acid-neutralizing agents in environmental remediation and soil conditioners in agriculture.
Safety and Storage
While non-toxic, prolonged exposure to airborne particles requires NIOSH-approved N95 respirators. Storage silos should incorporate dust collection systems to prevent particulate emissions. Bulk bags (500-1,000kg) are the preferred packaging for industrial quantities, with 12-18 month shelf life when kept dry. Moisture absorption can cause caking, requiring mechanical breaking before use.
B2B Procurement Guide
Procurement managers should specify: particle size distribution (D50 value), whiteness index (for decorative applications), and chemical composition (CaCO3 or SiO2 content). Sample testing for oil absorption and methylene blue value is recommended. Bulk purchasing (20+ tons) typically reduces unit costs by 15-20%. Establish long-term contracts with quarries to ensure consistent quality, particularly for construction projects requiring uniform material properties.
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