Abstract: Base cement compositions comprising particle-size distribution-adjusting agents, and methods of using such base cement compositions in subterranean operations and surface applications are provided. An example of a method comprises: providing a base cement composition comprising water, a hydraulic cement, a set retarder, and a particle-size distribution-adjusting agent, the base cement composition having a density; adjusting the density of the base cement composition on-the-fly with a density modifying agent to provide a density-adjusted cement; activating the density-adjusted cement composition; placing the density-adjusted cement composition in a subterranean formation; and permitting the density-adjusted cement composition to set in the subterranean formation.