Cement/sɪˈment/ Definition 1 of 4Pro Tip 1/3Mixing Essentials Cement must be mixed with water and aggregates like sand or gravel to form concrete. Mix cement with water and sand to make a smooth concrete mixture. Pro Tip 2/3Hardening Process When cement dries, it becomes solid and creates a strong bond between building materials. Be careful with the placement; cement hardens quickly. Pro Tip 3/3Construction Use Cement's primary use is in construction for foundations, buildings, and roads. Load the cement bags for the construction site.