Florida DOT Concrete Batchman/Operator Practice Exam

What is a recommended practice when using admixtures beyond their stated dosage?

1. Consult local ordinances

2. Obtain written recommendations

3. Conduct additional field tests

4. Only use standard dosages

The correct answer is: Obtain written recommendations

Obtaining written recommendations when using admixtures beyond their stated dosage is crucial because it provides a way to ensure the changes made do not negatively impact the concrete's properties or performance. Admixtures are designed with specific dosages to achieve desired results such as workability, strength, or durability. Deviating from these dosages can alter the chemistry of the mixture, possibly leading to unforeseen consequences such as reduced strength or increased setting time. By seeking written recommendations from the manufacturer or a qualified expert, the batchman or operator can receive tailored advice based on the specific mixture design and intended application. This helps in making informed decisions and mitigating risks associated with using admixtures at inappropriate levels, ensuring compliance with project specifications and standards. This practice aligns with safety and quality assurance protocols commonly observed in concrete production.