Причина отменыThis 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Formerly under the jurisdiction of Committee C12 on Mortars and Grouts for Unit Masonry, this specification was withdrawn in May 2019. This standard is being withdrawn without replacement.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.

Реферат

This specification covers extended life mortar of types RM, RS, RN, and RO, for use in construction of non-reinforced or reinforced unit masonry. Materials used as ingredients in extended life mortar shall be of the following: Portland cement, masonry cement, hydrated lime, aggregates, water, and admixtures. Water shall be clean and free of oils, acids, alkalines, salts, organic materials or other substances that may be deleterious to mortar or corrosive to metals in the masonry. Mortar shall conform to average compressive strength, water retention, and air content indicated in this specification. Specimen for laboratory testing shall have attained final set. Moreover, moist storage and curing condition of specimen shall conform to the specification. For testing, the cone penetration method shall be utilized to determine the consistency of the mortar. The air content of the mortar shall be determined by either the pressure method or the volumetric method.

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