Cementing materials:

A slurry of portland cement and water and sometimes one or more additives that affect either the density of the mixture or its setting time.

The portland cement used may be high early strength common (standard), or slow setting.

Additives include accelerators (such as calcium chloride), retarders (such as gypsum), weighting materials (such as barium sulfate), lightweight additives (such as bentonite), or a variety of lost circulation materials (such as mica flakes).