What should be done if a concrete mix is overly dry?

When a concrete mix is overly dry, the appropriate corrective action is to add additional water or admixtures. This approach helps to achieve the desired consistency and workability of the mix. Water is crucial in the concrete hydration process, allowing the chemical reactions to occur. If the mix lacks sufficient moisture, it can lead to difficulties in pouring, finishing, and overall strength development.

Admixtures, which can be either water-reducing agents or plasticizers, can enhance the mix's ability to flow without adding excess water, thereby maintaining the desired strength characteristics. Adjusting the water content is essential for ensuring the concrete can be easily placed and finished while still achieving optimal performance.

In contrast, removing aggregates, increasing mixing speed, or allowing the mix to sit do not adequately address the main issue of insufficient moisture. Removing aggregates could worsen the mix's sturdiness and might not help achieve proper consistency. Increasing mixing speed might incorporate air into the mix but won't resolve the overall dryness. Allowing the mix to sit without intervention is unlikely to enhance its workability or effectiveness.