What additional purpose does water serve in concrete apart from facilitating hydration?

Water plays a critical role in the preparation of concrete beyond just facilitating hydration, which is the chemical reaction of water with cement that generates strength. One significant additional purpose is its function as a lubricant in the concrete mixture. The right amount of water helps achieve a workable consistency, allowing for the smooth mixing, transportation, and placement of concrete without segregation of the materials. By reducing friction between the aggregates, it enables the mixture to flow better, allowing for easier handling and placement into forms.

While water indeed impacts the overall uniformity and bonding within the concrete, its primary contribution as a lubricant directly aids in achieving the desired consistency, making it essential for producing a homogenous mix. Thus, highlighting the practical aspect of water as a lubricant is crucial for understanding how to manipulate concrete properties during the construction process.