When must admixtures be sampled?

Sampling of admixtures is crucial to ensure their quality and compliance with project specifications. It is essential to sample admixtures at least 10 days before they are scheduled for use. This timeline allows for adequate testing and analysis, ensuring any issues can be addressed ahead of time.

By sampling early, inspectors can evaluate the admixture for the required properties and establish that it meets the necessary standards and specifications. If problems are discovered, adjustments can be made in time to prevent delays in the construction process. This proactive approach plays a key role in maintaining the integrity of the concrete mix and the overall quality of the construction work.

In contrast, sampling on the day of use might not leave sufficient time for testing, and sampling after use would be too late to correct any potential deficiencies. Sampling before delivery could also fail to account for any environmental or handling factors that might affect the admixture. Therefore, the requirement to sample at least 10 days before use is designed to promote quality assurance effectively.