ACI Concrete Strength Testing Technician Practice Test 2025 - Free Practice Questions and Study Guide

The correct choice is to place the hardened face of the lower bearing block facing up when setting it on the table. This orientation is important because the hardened face is designed to provide a stable and durable surface that can withstand the load exerted during strength testing of concrete cylinders or beams. By ensuring the hardened side faces up, the integrity of the testing process is maintained, as it prevents any deformation or damage that could arise from using a softer surface.

The hardened face is intended to minimize any potential for wear or deformation caused by the weight of the specimen being tested or the equipment used in the testing process. This is essential for achieving accurate and repeatable test results, as any inconsistencies or imprecise measurements could lead to a misinterpretation of the concrete’s strength.

In contrast, a soft face could compress or deform under pressure, leading to erroneous results, while surfaces that are rough or unprepared may not provide an adequate bearing surface, which further complicates accurate testing. Therefore, using the hardened face ensures that the testing setup is both reliable and consistent, aligning with best practices for concrete strength testing.