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Question
Which of the following type of coarse aggregate is preferred in road construction, so that greatest density of road layer is achieved?
A.
Any type of aggregates
B.
Single-size aggregates
C.
All-in aggregates
D.
Porous aggregates
Answer ( Option C)

All-in aggregates

Solution

Any type of aggregates: 
• This statement is incorrect. 
• Using any type of aggregates without considering their size, shape, and grading can result in poor compaction and lower density of the road layer. 
• Randomly mixed aggregates can create irregularities and weak points in the road structure. 
• Such aggregates do not ensure uniform distribution and bonding, leading to potential road failure under load. 
Single-size aggregates: 
• This statement is incorrect. 
• Single-size aggregates can lead to voids in the compacted layer because they do not pack together efficiently. 
• This results in lower density and reduced strength of the road layer. 
• The lack of smaller particles to fill gaps means the structure can shift and settle over time, decreasing road longevity. 
All-in aggregates: 
• This statement is correct. 
• All-in aggregates, which include a mix of various sizes, tend to fill voids more effectively, leading to better compaction and higher density. 
• This results in a stronger and more stable road layer. 
• The variety of sizes allows for a more interlocked structure, enhancing the load-bearing capacity and durability of the road. 
Porous aggregates: 
• This statement is incorrect. 
• Porous aggregates are not preferred for achieving high density in road construction. 
• They have high void spaces and do not compact well, resulting in lower density and potential stability issues. 
• Such aggregates can absorb water, leading to freeze-thaw damage and weakening of the road structure over time.

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