What is a common method to evaluate the moisture content of aggregates?

The oven drying method is a widely accepted procedure for evaluating the moisture content of aggregates because it provides a direct measurement of the amount of water present. In this method, a sample of aggregates is weighed, then dried in an oven at a specified temperature until a constant weight is achieved, which indicates that all moisture has evaporated. The weight is then taken again, and the difference between the initial and final weights is calculated to determine the moisture content.

This method is effective because it is straightforward and typically yields reliable results, making it standard practice in many construction and materials laboratories. It helps in assessing whether the aggregates are suitable for use in concrete or other applications, as excessive moisture can affect the results of mixes and the overall performance of concrete products.

Other methods mentioned, such as aggregate sieving and hydrometer analysis, serve different purposes and are not specifically intended for moisture content evaluation. Sieving helps in determining the particle size distribution, while hydrometer analysis is used to measure the specific gravity and particle size of fine aggregates. Rheological testing focuses on the flow and deformation behavior of materials, which does not relate to moisture content measurement. Therefore, the oven drying method stands out as the most appropriate and effective choice for assessing the moisture content of aggregates.