In he preparation of Type N portland-lime mortar with pigment, portland cement bags labeled "Type I/II" were used instead of the specified Type I. Fearing that a significant color change would occur in the future mortar, it was decided to continue the use of the Type I/II. What changes in the performance characteristics can we expect?
Probably none. A Type I/II As portland cement simply means that it meets the requirements of both Type I and Type II. Type II portland cements have a lower heat of hydration and have more resistance to sulfate attack than do many Type I portland cements. The Type I/II cement, however, still meets all the requirements of Type I portland cement and, therefore, would not cause a problem in the mortar.