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.
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