Q1. The void ratio of. A. single size coarse aggregate is roughly 0.45...
The void ratio is an important parameter in civil engineering and construction, as it provides information about the compactness and porosity of different types of aggregates. In this case, the question asks about the void ratio of single size coarse aggregate, graded coarse aggregate, and fine aggregate. Let's analyze each option in detail:
A. Void ratio of single size coarse aggregate is roughly 0.45:
- Single size coarse aggregate refers to aggregates that consist of particles of a single size range.
- The void ratio of single size coarse aggregate is approximately 0.45, which means that 45% of the aggregate volume is composed of voids or empty spaces.
- This void ratio is determined by the particle size distribution and shape of the coarse aggregate. Generally, larger and more angular particles tend to have a higher void ratio compared to smaller and rounded particles.
B. Void ratio of graded coarse aggregate is roughly 0.040:
- Graded coarse aggregate refers to aggregates that consist of particles of various sizes, which are carefully graded to achieve a specific particle size distribution.
- The void ratio of graded coarse aggregate is approximately 0.040, indicating that only 4% of the aggregate volume is occupied by voids.
- The low void ratio of graded coarse aggregate is a result of the carefully controlled particle size distribution, which ensures that there are fewer voids between the particles.
C. Void ratio of fine aggregate is roughly 0.45:
- Fine aggregate refers to smaller particles used in construction, such as sand.
- The void ratio of fine aggregate is also roughly 0.45, similar to the void ratio of single size coarse aggregate.
- This void ratio is influenced by factors such as particle shape, surface texture, and gradation of the fine aggregate.
D. All the above:
- Based on the information provided, the void ratio of single size coarse aggregate is approximately 0.45, graded coarse aggregate is roughly 0.040, and fine aggregate is also roughly 0.45.
- Therefore, the correct answer is D, which states that all the above options are correct.
In summary, the void ratio of single size coarse aggregate is roughly 0.45, graded coarse aggregate is roughly 0.040, and fine aggregate is also roughly 0.45. These values provide insights into the compactness and porosity of different types of aggregates used in construction.