Which practice best confirms there are no voids near formwork after finishing?

• A. Visual inspection for aggregate coverage and absence of protruding air voids.
• B. Applying a water-spray test.
• C. Conducting a moisture content test.
• D. Measuring surface reflectivity.

Answer: (A)

Direct visual inspection of the finished surface is the best way to confirm there are no voids near formwork. After finishing, the near-formwork zone is prone to air pockets and honeycombing if consolidation wasn’t thorough. A careful visual check looks for uniform cement paste coverage around the aggregates, complete filling at the edges, and a smooth, continuous surface without visible air voids or rough, pockmarked areas. If the surface shows exposed aggregate, voids, or uneven patches, it indicates there may be voids underneath that could weaken the concrete and invite future problems. Other methods don’t target the near-formwork surface as effectively: a water-spray test can reveal surface porosity but doesn’t definitively prove absence of voids; moisture tests assess internal moisture content, not surface voids; and surface reflectivity relates to finish aesthetics rather than void presence.