• “Grout” and “mortar” are not synonyms and are NOT the same
• Essentially fluid concrete
• Fills cores of CMU, especially when there is reinforcement in the cores
• Generally composed of a mixture of water, cement, sand, pea gravel
• Fine grout or coarse grout –applied as a thick liquid, and hardens over time
• Must be 2000 psi minimum and greater than f’m
• Can be similar strength as CMU, but does not need to be
• Fine grout must be used as per code requirements when the grout space is too congested by reinforcing steel or other obstructions that would impede the flow of grout as intended down the entire column
• Coarse grout is based on fine grout mix proportions with 1-2 parts additional (3/8″) coarse aggregate added
• Self-consolidating grout (SCG) is a specially-formulated grout for use with reinforced masonry. It is very flowable, easy to install, increases the masonry’s moisture-resistance, and has less shrinkage than conventional grout. SCG is specifically permitted to be used by the Structural Masonry Specification (TMS 602), which is referenced by the IBC Codes