The Rebound Hammer (Schmidt hammer) test on concrete gives an estimate of:
Choose the correct answer
Exact cube compressive strength (accurate as cube test)
Estimated surface hardness, which correlates approximately with compressive strength — for comparative assessment
Tensile strength directly
Permeability of concrete
Correct Answer
B. Estimated surface hardness, which correlates approximately with compressive strength — for comparative assessment
Why is this the answer?
Rebound hammer (IS 13311 Part 2): measures rebound number R when hammer plunger hits concrete surface. R correlates (approximately) with surface hardness → estimated compressive strength. Accuracy limited (surface condition, aggregate type, carbonation affect results). Used for comparative testing and identifying weak zones — NOT a substitute for destructive cube test.
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