What happens when an aggregate sample is not properly dried before testing for moisture content?

When an aggregate sample is not properly dried before testing for moisture content, the test results can show falsely low moisture levels. Properly drying the aggregate sample is crucial because any residual moisture in the aggregate will contribute to its total weight. If the sample is tested without being adequately dried, the moisture present in the sample will not be accounted for, leading to an underestimation of the moisture content. This could result in an inaccurate understanding of how much water needs to be added or how much water is present in the concrete mix, potentially compromising the mix's performance and strength.

The importance of accurate moisture content measurement lies in its direct impact on the water-to-cement ratio in concrete mixes. Therefore, failing to properly dry the sample could mislead engineers and technicians in deciding how to use the aggregate effectively, affecting the quality and durability of the final product.