Good Qualities of an Ideal Aggregate

Good Qualities of an Ideal Aggregate

1. Strength

• Aggregates should possess a sufficient level of strength to resist crushing and abrasion.

2. Toughness

• An ideal aggregate must be tough to withstand the stresses caused by moving loads.

3. Hardness

• Hardness is crucial to prevent excessive wear and depreciation under traffic.

4. Durability

• Aggregates need to be highly durable to ensure longevity and withstand environmental conditions.

5. Shape and Size

• Well-shaped aggregates (cubical or rounded) ensure better packing and minimal voids.
• The size must be graded and well-distributed to provide maximum packing density.

6. Specific Gravity

• Higher specific gravity indicates denser and stronger aggregates.

7. Water Absorption

• Low water absorption is preferred as it indicates fewer pores and thus better quality.

8. Cleanliness

• Aggregates should be free from impurities such as dust, clay, or organic matter that could affect bonding with cement.

9. Chemical Stability

• Aggregates should be chemically inert within the concrete mixture to avoid reactions that can weaken the bond.

10. Resistance to Freezing and Thawing

• Ideal aggregates should resist freeze-thaw cycles to prevent cracking in climates with varying temperatures.