What factors should be considered when selecting aggregates for concrete?

When selecting aggregates for concrete, it is crucial to focus on the type, grading, shape, and cleanliness of the aggregates because these factors significantly influence the overall performance and durability of the concrete mixture.

The type of aggregates affects the strength, density, and potential for reaction with the cement. Grading is important because it ensures a good particle size distribution, which can lead to optimal packing and lower void content, resulting in a stronger concrete with better workability. The shape of the aggregates affects how well they interlock and can impact the concrete's strength and workability. Cleanliness is vital as impurities like dust, clay, or organic materials can interfere with the bonding between aggregates and cement, ultimately affecting the durability and strength of the concrete.

While other options mention aspects like color, size, and weight, these are generally less critical in comparison to the core factors of type, grading, shape, and cleanliness when ensuring the quality and effectiveness of concrete.