Stones obtained by blasting are typically suitable for which engineering uses? Choose the best option.

Introduction / Context:
Blasting in quarries produces broken rock in various sizes. The question evaluates knowledge of standard applications of blasted stone fragments in transportation and structural works.

Given Data / Assumptions:

• Blasting yields angular fragments.
• Grading after crushing/screening can be controlled.
• Common uses include ballast, aggregate, and road metal.

Concept / Approach:
Angular, crushed fragments provide good interlock and load distribution. Suitability depends on rock type, durability, abrasion resistance, and gradation, but generally blasted stone, when properly processed, is ideal for ballast, concrete aggregate, and road base/surface courses.

Step-by-Step Solution:

Verification / Alternative check:
Codes and manuals list crushed, angular stone as preferred for ballast, aggregates, and pavement layers due to interlock and durability advantages.

Why Other Options Are Wrong:

• Ballast only: Too narrow; other uses exist.
• Aggregates only: Ignores road applications.
• Road metal only: Ignores ballast and concrete uses.

Common Pitfalls:
Assuming “blasted” equals “unprocessed” and overlooking necessary screening/washing for specific applications.

Final Answer:
All of the above