What should be done if a concrete sample is found to be too dry during testing?

When a concrete sample is found to be too dry during testing, re-evaluating it is essential because moisture content significantly impacts the material's properties and the test results. A sample that is too dry may not represent the concrete that will be used in the structure, as it might not perform as intended.

Discarding the sample immediately could lead to unnecessary waste without first determining if the sample could still provide useful information. On the other hand, mixing the sample with water is inappropriate because it alters the original composition of the concrete, which defeats the purpose of the test. Testing a sample irrespective of its consistency would not yield valid or reliable results, as conditions that deviate significantly from standard requirements can skew the outcome.

Therefore, the best action is to re-evaluate and potentially discard the sample, ensuring that any conclusions drawn from testing accurately reflect the concrete's actual performance characteristics.