A rebound hammer test on hardened concrete primarily provides an indication of its
Correct answer: B. Surface hardness and uniformity
- A. Internal water-cement ratio
- B. Surface hardness and uniformity
- C. Aggregate absorption capacity
- D. Initial setting time
Explanation
A rebound hammer measures the rebound of a spring-driven mass and mainly indicates surface hardness and relative uniformity. It can support strength estimation through correlations, but it does not directly measure the internal water-cement ratio.
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About Concrete Technology
Concrete technology covers cement, aggregates, water and admixtures, including their properties, proportioning and effect on fresh and hardened concrete. It explains workability, water-cement ratio, setting, hydration, strength, durability, curing, mix design and common defects, while distinguishing segregation and bleeding from general loss of workability.
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