Crushed stone is mainly composed of silicon dioxide (SiO₂), and also contains a variety of silicate minerals and trace metal oxides. The specific composition depends on its parent rock type. The following is a detailed description:
Main chemical composition
Silicon dioxide (SiO₂): It accounts for the highest proportion. About 74.3% of the earth's crust is silicon dioxide. This is the common core component of crushed stone.
Other components : It includes silicate minerals such as orthoclase, quartz, plagioclase, as well as a small amount of biotite, iron oxide and trace compounds of elements such as manganese, copper, aluminum, and magnesium.
Parent rock source and classification Crushed stone is made of natural rocks (such as granite, limestone, quartz) or mine waste rocks through mechanical crushing. Its parent rock types include:
Igneous rock (such as granite);
Sedimentary rock (such as limestone);
Metamorphic rock (such as marble).
Physical and engineering properties Crushed stone has a rough and angular surface, strong bonding performance with cement, and is suitable for high-strength concrete. The diversity of its composition leads to differences in technical requirements such as hardness (Mohs hardness 3-8) and particle grading for different types of crushed stone.
Citation: The core conclusions synthesize highly authoritative sources and integrate parent rock types and engineering application scenarios.