What is the term used for the process of mechanically pouring grout into hollow block cells of CMU walls?

The term used for the process of mechanically pouring grout into hollow block cells of CMU (Concrete Masonry Unit) walls is indeed "grouting." This process involves filling the voids within the blocks with a grout material, which is usually a mixture of cement, water, and sometimes aggregates. The purpose of grouting in CMU walls is to increase structural integrity, enhance load-bearing capacity, and provide resistance against lateral forces.

Grouting is often performed using specialized equipment, such as a grout pump, to ensure the material is delivered into the block cells evenly and effectively. The technique not only strengthens the walls but also helps to bond the units together, contributing to the overall durability of the masonry structure. The precision of the grouting process is crucial, as it ensures that the cells are fully filled, preventing issues like hollow areas that can weaken the wall.

While pumping is a method used to apply the grout, the act itself is specifically referred to as grouting. Mixing refers to preparing the grout before it is pumped, and drilling does not relate to the process of filling block cells; rather, it involves removing material to create openings or passages. Therefore, grouting is the most accurate term for this particular operation in masonry construction.