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This specification covers extended life mortar as delivered for use in construction of non-reinforced or reinforced unit masonry.
Formerly under the jurisdiction of Committee C12 on Mortars and Grouts for Unit Masonry, this specification was withdrawn in May 2019. This standard is being withdrawn without replacement. On technical review, it was realized that the specification contains compressive-strength requirements that are unrealistic, including C270 values for C780 field-cast specimens in either cubes or cylinders. There are currently no acceptable absolute compressive-strength values for C780 field-cast specimens. The C12 committee has purposely not put absolute values for of C780 field-cast compressive-strength specimens. The inclusion of absolute values for field-cast specimens in C1142 could create undesired precedents for other standards. In addition, the task group is not aware of any current users of extended-life mortar.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C91 Specification for Masonry Cement
C144 Specification for Aggregate for Masonry Mortar
C150 Specification for Portland Cement
C207 Specification for Hydrated Lime for Masonry Purposes
C270 Specification for Mortar for Unit Masonry
C780 Test Method for Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit Masonry
C1072 Test Methods for Measurement of Masonry Flexural Bond Strength
E447 Test Method for Compressive Strength of Laboratory Constructed Masonry Prisms
E518 Test Methods for Flexural Bond Strength of Masonry
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ASTM C1142-95(2013), Standard Specification for Extended Life Mortar for Unit Masonry (Withdrawn 2019), ASTM International, West Conshohocken, PA, 2013, www.astm.orgBack to Top