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ASTM Standard Specification for Mortar for Unit Masonry (ASTM C 270) requires mortar to be specified either by proportion specifications or property specifications. For portland cement-lime (PCL) mortars, it has been suggested that a significant difference exists between the properties of mortars mixed according to the proportion specifications and the requirements of the property specifications.
This paper presents data confirming that compressive strengths of PCL mortars according to current proportion limits do vary significantly from present property specification requirements. Alternative proportions that would bring the performance of cement-lime mortars more in line with the property specification requirements can be formulated based on the data.
The paper also investigates the relationship of portland cement content to flexural bond strength development of cement-lime mortars as obtained from tests conforming to UBC Standard 24-30. A mathematical model of the relationship is proposed and compared to additional experimental data.
mortar, portland cement, lime, hydrated lime, compressive strength, flexural bond strength
Masonry Specialist, Engineered Structures & Codes, Portland Cement Association, Skokie, IL
Manager Quality Assurance, Research & Development, Holnam Inc., Dundee, MI