Well-Graded Gravel: The Ideal Choice for Road Projects

Why is well-graded gravel recommended for road projects?

a) Well graded gravel since gravels are of same size and easily compacted
b) Poorly graded gravel since gravels are same size and easily compacted
c) Poorly graded gravel since gravels are different size and easily compacted
d) Well graded gravel since gravels are different size and easily compacted

Answer:

The use of well-graded gravel for a road project's base is recommended because the aggregates are of the same size and easily compacted. They also produce a more stable base that can withstand pressure.

For road projects that require a gravel base, well-graded gravel is recommended for the following reasons:

Uniform Size and Easy Compaction

Well-graded gravel is composed of particles of the same size, making it easy to compact. This uniformity in size allows the particles to bind together efficiently, creating a stable base for the road project.

Stability and Pressure Resistance

Due to the even distribution of particle sizes, well-graded gravel provides a stable base that can withstand pressure from traffic and environmental factors. This ensures the longevity and durability of the road project.

Uniform Void Spaces for Drainage

The void spaces between the aggregates in well-graded gravel are almost uniform, allowing water to drain easily through the base to the sub-base. This helps in preventing water accumulation, which can weaken the road structure over time.

On the other hand, poorly graded gravel, with varying particle sizes, can lead to instability in the road base. The different sizes of particles do not compact efficiently, resulting in larger void spaces and less stability.

Therefore, when undertaking road projects that require a gravel base, it is advisable to choose well-graded gravel for its uniformity, stability, and pressure resistance.