Coarse aggregate has the most importance in construction projects especially in concrete construction. What is coarse aggregate? It refers to gravel, crushed stone and or any other material with strength and durability as the main components of concrete. Particle size, particle shape and nature of aggregates determine the properties of concrete and ease of placing.
Types of Coarse Aggregate
- Flaky Aggregates:
When sixteen determines flaky aggregates, the thickness is less than 60% of the mean dimension, that is, the thickness of the flaky aggregate is less than their length and width. These irregular aggregates are generally not acceptable for the production of concrete, since they adversely affect the strength and workability of concrete. - Elongated Aggregates:
These aggregates are extended more as compared to their thickness and width. Like flaky aggregates, elongated aggregates also have detrimental effects on concrete performance and strength to make them unfit for any construction. - Flaky and Elongated Aggregates:
Shapes of these aggregates are intermediate between flat and elongated ones which makes them very challenging when producing concrete. They greatly impair its workability and are capable of compromising the structure as a whole.
Characteristics Requirements of Coarse Aggregate
It is vital to have correct grading and selection of the various types of coarse aggregates to a concrete product. Some of the key requirements include:
Hardness and Strength:
Coarse aggregate has to be hard and strong so as to enhance workability of concrete mix and increase its durability.
Purity:
It should of course be kept clean from both mineral and organic materials which would eventually compromise the bond between the aggregate and the cement.
Moisture Resistance:
High water absorption affects concrete performance, so coarse aggregates should not allow water absorption.
Durability:
This means that the aggregate used must stand up to aggressive chemicals, weather and the other outside forces that would affect the ‘stability’ of the structure.
Specific Gravity:
The specific gravity of coarse aggregates should lie betweeen 2.6 and 2.9. Higher specific gravity increases the mass effects of concrete alongside enhancing its general strength.
Absence of Harmful Substances:
Chloride, sulfate or alkali should not be allowed in coarse aggregate because these materials affect the quality and durability of concrete.
Conclusion
Coarse aggregate is essential in construction, impacting concrete’s strength, durability, and workability. Types include flaky, elongated, and irregular aggregates, each suited to different projects. Selecting the right aggregate contributes to a structure’s stability and longevity. Walls and Dreams can guide you in choosing the optimal materials for durable, high-quality construction.
