Question: what is the difference between concrete mortar and grout?
Answer: Can mortar or concrete be used for grout? The main difference between mortar and grout is the amount of water in the mix. ... Mortar often contains hydrated lime; grout usually contains little if any hydrated lime (ASTM C 476, Specification for Grout for Masonry, allows up to 1/10 part lime to 1 part cement).