ACI Concrete Field Testing Technician - Grade I Practice Exam

What is an essential precaution during the transportation of concrete test specimens?

1. Avoiding solely vertical placement

2. Protecting against moisture loss

3. Keeping them in ambient temperatures

4. Using light vehicles only

The correct answer is: Protecting against moisture loss

Protecting against moisture loss is crucial when transporting concrete test specimens. Concrete is a hydrophilic material, meaning it requires moisture to maintain its strength and integrity. During transportation, if the concrete specimens are exposed to air, they can lose moisture rapidly, leading to surface cracking or a change in properties that can skew testing results. Maintaining adequate moisture ensures that the specimens cure properly and reflect the true performance characteristics of the concrete mix. This is particularly important for tests that assess the strength and durability of concrete, as any loss of moisture before testing could result in inaccurate results. The other options, while they may seem relevant, do not address the primary concern of moisture retention during transportation. For example, avoiding solely vertical placement might relate to how specimens are positioned, but it doesn’t directly impact moisture levels. Similar logic applies to the ambient temperature and vehicle choice; while some of these factors might influence concrete's overall condition, the immediate concern during transport is ensuring that the specimens do not dry out.