1.1 This specification covers extended life mortar as delivered for use in construction of non-reinforced or reinforced unit masonry.

1.2 This specification is a property standard.

1.3 Four types of mortar are covered: RM, RS, RN, and RO. These types of mortar can be manufactured by using one of the four mortar formulations with masonry aggregate: portland cement, portland cement-lime, masonry cement, or masonry cement with portland cements. The materials are listed in Section 5.

1.4 Appendix X1 provides a rationale statement and commentary.