What are the two types of aggregate according to their origin?

The distinction of aggregate into two main types based on their origin is significant in construction and material engineering. Natural aggregate refers to materials that are sourced directly from nature, such as sand, gravel, and crushed stone, which are mined or extracted without significant alteration. Manufactured aggregate, on the other hand, encompasses materials that are produced from processing raw materials, usually through crushing and screening operations. These include crushed concrete, brick, and various forms of artificial aggregates created to meet specific engineering requirements.

Understanding the two categories is essential for aggregate technicians as it influences decisions on the suitability of materials for different construction applications, as well as their performance characteristics, environmental impact, and cost-efficiency.

The other options categorize aggregates in ways that are relevant in different contexts—such as particle size or usage—but they do not address the origin of the aggregates themselves. Therefore, identifying aggregates based on their natural or manufactured classification is crucial for professionals in the field.