Grouting

Hi everyone!
I need your help one more time. I came across a phrase that I´m not sure how to translate into Spanish. It´s Grouting Concrete Tiles. Can you help me translate the word "grouting"?
Thanks in advance!

Nadia:

Grouting is a thin, coarse mortar poured into various narrow cavities to fill them and consolidate the adjoining objects into a solid mass. Maybe you could translate it by 'material para rellenar', 'lechada', or 'colocar las tejas, baldosas (or whatever) sobre una capa de cemento'.

Eulalia

other words for grouting besides "lechada" are "emboquillado" or "fragüe". It varies from country to country.

I hope it helps