Velke Dravce Basalt Description

Velke Dravce Basalt is a volcanic rock that is quarried in Veľké Dravce, within Lučenec, Banská Bystrica, Slovakia. It is known for its fine-grained, homogeneous texture and distinctive coloration, which ranges from dark gray to steel blue and, occasionally, black with petroleum-green shades.

Physical and Mechanical Properties

• Water Absorption: Low, typically less than 1.0%
• Density: Ranges from 2830 to 3000 Kg/m³
• Flexural Strength: Between 18 - 26 MPa
• Compressive Strength: Between 180 - 220 MPa
• Hardness: High, approximately 6-7 on the Mohs scale
• Porosity: Very low, contributing to its durability
• Slip Resistance: High, which makes it suitable for both indoor and outdoor applications

Chemical and Mineral Composition (% by weight)

• Silicon Dioxide (SiO2): Approx. 45-50%
• Aluminum Oxide (Al2O3): Approx. 13-16%
• Iron Oxides (FeO + Fe2O3): Approx. 10-12%
• Calcium Oxide (CaO): Approx. 8-12%
• Magnesium Oxide (MgO): Approx. 5-8%
• Sodium Oxide (Na2O): Approx. 2-4%
• Potassium Oxide (K2O): Approx. 1-2%
• Titanium Dioxide (TiO2): Approx. 1-2%
• Other Trace Elements: Including manganese, phosphorous, etc.

Usage

• Construction: Used extensively in building exteriors and interiors for its durability and aesthetic appeal.
• Landscaping: Ideal for paving, cladding, and garden sculptures due to its slip resistance and weather resistance.
• Monuments and Memorials: Its ability to withstand weathering makes it suitable for outdoor commemorative structures.
• Industrial Applications: As a filler in asphalt and concrete products for enhanced performance.

Maintenance

• Generally, low maintenance due to its robust nature.
• It should be cleaned periodically with neutral pH cleaners to maintain its appearance.
• Sealing is optional but can enhance resistance to stains and growth of moss or mildew, particularly in damp environments.

Cutting Sizes (cm)

• Slabs: Customizable but typically available in standard sizes such as 240x120 cm
• Tiles: Common sizes include 30x30, 60x30, 60x60
• Custom sizes and shapes can be produced upon request based on project requirements.

Common Surface Finish Options

• Polished: For a glossy, reflective surface, often used for interior applications.
• Honed: A matte finish that retains the stone's natural look, suitable for both indoor and outdoor use.
• Flamed: A rough texture enhancing slip resistance, ideal for outdoor paving and walkways.
• Bush-Hammered: A coarse surface providing excellent traction for exterior flooring or decorative purposes.

Velke Dravce Basalt stands out for its strength, versatility in usage, and range of finishes, making it a popular choice for architects and builders seeking performance and aesthetic appeal.