What is used in the mixture for grout to achieve a fluid consistency?

The correct choice involves the use of no aggregate in the mixture for grout to achieve a fluid consistency. Grout is typically designed to fill spaces and create a bonded, strong, and fluid material that can flow easily into the gaps it is meant to fill. When aggregate is included in a grout mixture, it can create a more viscous consistency that may not flow as freely compared to a mixture that does not contain aggregate.

By omitting aggregate, the grout remains more fluid, allowing it to easily penetrate small voids and spaces, ensuring better adhesion and a more effective fill. This fluidity is essential for applications such as setting tiles or filling joints where a smooth, cohesive material is crucial for the integrity of the installation. The absence of aggregate makes the grout less dense and more workable, which is beneficial for achieving the desired application characteristics.