ACI Concrete Field Testing Technician - Grade I Practice Exam

What is the height of the slump mold used in the test?

1. 10 in. [250 mm]

2. 12 in. [300 mm]

3. 14 in. [350 mm]

4. 8 in. [200 mm]

The correct answer is: 12 in. [300 mm]

The height of the slump mold used in the test is indeed 12 inches (300 mm). This specific dimension is defined by the ASTM C143/C143M standard, which governs the slump test procedure. The slump cone or mold is essential for determining the workability of fresh concrete. Its standardized height ensures consistency in measurements across different testing situations, allowing engineers and technicians to assess the concrete's consistency effectively. The use of a uniform mold height helps operators to replicate the test conditions, providing reliable and comparable results. Understanding the significance of the slump mold's height is important for accurate testing and assessment of concrete performance, which can ultimately affect the quality of construction projects.