ACI Concrete Field Testing Technician - Grade I Practice Exam

What is the maximum allowable size of aggregate for this test method?

1. 25 mm (1 in.)

2. 50 mm (2 in.)

3. 75 mm (3 in.)

4. 100 mm (4 in.)

The correct answer is: 50 mm (2 in.)

The maximum allowable size of aggregate for the concrete field testing technician method is 50 mm (2 in.). This specification is vital for ensuring that the aggregates used in concrete mixes can be properly evaluated for their impact on the resulting concrete's strength, workability, and overall performance. Using aggregates larger than this maximum size can lead to inconsistencies in testing, as they may not mix evenly within the concrete mix or may not flow properly during workability assessments. Additionally, larger aggregates can create voids or weak points in the finished product, which can compromise the integrity of the concrete. Therefore, understanding the specifications surrounding the size of aggregate is crucial for technicians to ensure accurate concrete performance assessments and to maintain quality standards in concrete production. The guideline provided helps to streamline the testing process and ensures that results reflect the true characteristics of the concrete mix.