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This paper reviews the attempts of ASTM Committee C-7 on Lime to develop an acceptable method of assessing the expansive potential of unhydrated MgO in Type N hydrated lime in masonry mortar. Autoclave expansion tests on bars of mortar containing hydrated lime, portland cement, and aggregate are rejected because of variable results. A new test method has been developed in which autoclave expansion values for pressed tablets are more consistent and are considered more realistic in terms of field performance.
hydrated lime (Type N), dolomitic, autoclave expansion, unsoundness, tablets (compacts), masonry mortar, cementitious materials, measurement, acceptability
Research Officer, Division of Building Research, National Research Council of Canada, Halifax, Nova Scotia