ACI Concrete Field Testing Technician - Grade I Practice Exam

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What is the approximate depth of concrete after placing the second layer of the slump test?

2 1/8 in. [55 mm]
6 1/8 in. [160 mm]
5 in. [125 mm]
7 in. [175 mm]

The correct answer is: 6 1/8 in. [160 mm]

In the slump test, the procedure involves filling a standardized cone in two layers. Each layer is given a specified depth to ensure consistency and accuracy in measuring the workability of the concrete mix. The proper depth for the second layer of the slump cone typically aims to achieve an overall height that allows for effective measuring once the cone is removed. The total depth of the concrete filling after placing the second layer should be approximately 6 1/8 inches (160 mm). This height is essential in establishing a uniform standard across tests, ensuring that all tests are comparable. The other depth options do not conform to the established practices for the slump test, which specifies the need for a complete filling of the cone to the designated height. This standard maintains consistency in measuring and interpreting the slump results, which are critical indicators of workability in concrete mixes.