What concrete slurry is used for back-fill?

Concrete slurry used for back-fill typically consists of a mixture of cement, water, and aggregates, designed to achieve a fluid consistency for easy placement. This slurry may also include additives to enhance its workability, set time, and durability. It is commonly used in applications such as filling voids, stabilizing soil, and providing support for structures. The specific formulation can vary based on the project's requirements and the local soil conditions.