For preparing a test specimen it is necessary:

Steps for Preparing a Concrete Test Specimen

Preparing a representative test specimen requires three essential steps, and all three options listed in the question are necessary:

A — Dry-mixing cement and fine aggregate ensures the binder is uniformly distributed through the fine material before any water is introduced, preventing clumps.

B — Adding coarse aggregate completes the mix skeleton and ensures the right proportions and gradation are represented in the specimen.

C — Adding water to the combined dry materials initiates hydration and gives the mix the intended workability and water-cement ratio.

Key takeaway

Standard specimen prep sequence: dry-mix cement + sand → add coarse aggregate → add water. Skip any step and the specimen is not representative.