acv range of granite, basalt, limestone, felspar

ACV Range of Granite, Basalt, Limestone, and Feldspar

The Abrasion Coefficient Value (ACV) is a critical parameter used to evaluate the resistance of rocks to wear and abrasion. It plays a significant role in determining the suitability of materials for construction, road surfacing, and other engineering applications. Below is an overview of the typical ACV ranges for granite, basalt, limestone, and feldspar.

Granite
Granite is an igneous rock known for its durability and high resistance to abrasion. Its ACV typically ranges between 10 and 20, reflecting its hard mineral composition dominated by quartz and feldspar. The exact value depends on factors such as grain size, mineralogy, and weathering conditions. Fine-grained granites tend to exhibit higher resistance compared to coarse-grained varieties. Due to its low ACV, granite is widely used in heavy-duty applications like pavements, railway ballast, and architectural cladding.

Basalt
Basalt is another dense igneous rock with excellent wear resistance. Its ACV generally falls within 10 to 25, making it comparable to granite in terms of durability. The presence of minerals like pyroxene and olivine contributes to its toughness. However, vesicular or weathered basalt may show slightly higher ACV values due to reduced cohesion between mineral grains. Basalt’s high strength makes it ideal for aggregate production, especially in asphalt mixes and concrete reinforcement.

Limestone
Limestone is a sedimentary rock with variable ACV values ranging from 20 to 40. Its abrasion resistance depends largely on its calcite content and porosity. Dense, crystalline limestone exhibits lower ACV (closer to 20), while softer or chalky varieties may approach 40 or higher. Limestone’s moderate wear resistance limits its use in high-traffic areas unless treated with protective coatings. It remains popular for decorative purposes and light-duty construction projects where extreme durability is not required.

Feldspar
Feldspar minerals themselves are relatively hard but vary significantly depending on their type (e.g., orthoclase, plagioclase). When tested as individual mineral specimens or within rocks like granite, their ACV ranges between 15 and 30. Pure feldspar crystals tend toward the lower end of this range due to their cohesive structure. However, when present in weathered rocks or mixed with softer minerals, their abrasion resistance decreases noticeably.