ACI Certification Practice Exam

After the strike-off of the measure used for density, can a technician add concrete to correct a deficiency?

1. Yes, as long as it is minimal

2. No, it is against standards

3. Only with approval

4. Only if using the same mix

The correct answer is: No, it is against standards

Choosing to add concrete after the strike-off of the measure used for density directly contravenes established standards. Standards dictate strict adherence to procedures for measuring construction materials, especially when evaluating density. The strike-off process is meant to create a level and accurately measured sample in preparation for density evaluation. Introducing additional concrete at this stage could disrupt the integrity and accuracy of the measurement, leading to an unreliable result. Therefore, this practice is not permitted. On the other hand, the alternative options generally suggest scenarios that imply allowance or conditions where minor adjustments might be acceptable. However, none of these suggestions align with the strict protocols set forth in concrete testing standards, which emphasize consistency and integrity in material measurements. As such, strictly adhering to the regulations without deviation is essential for maintaining quality and reliability in concrete testing processes.