alleryStart learning →The rebound hammer commonly used in non-destructive testing of concrete was developed in 1948 and is best known by which inventor's name?
AWilliams
BEinbeck
CSchmidt
DFrank
Answer & Solution
Correct answer: C. Schmidt
1. The unit lists devices for measuring concrete surface hardness.
2. Williams testing pistol, Frank spring hammer and Einbeck pendulum exist but proved inconsistent.
3. The Schmidt rebound hammer, developed in 1948, is the commonly adopted instrument.
4. It uses a spring-controlled mass sliding on a plunger within a tubular housing.
5. The other names belong to alternative, less practical devices.
_Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._
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