Preliminary Report On the Limestones And the Lime Industry of Manitoba
Preliminary Report On the Limestones And the Lime Industry of Manitoba
Canada Mines Branch
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As produced in the ordinary process of lime burning it has little chemical affinity for water, hence a quicklime containing a large proportion of magnesia is slow slaking, producing a smaller quantity of lime paste or putty than quicklime largely made up of calcium oxide. Magnesia, though inert in slaking, is very active in setting and, according to several authorities as reported in technical journals, the magnesia lime when used neat will have 50% greater strength than the high calcium one; i...n the case of sand mixtures it will carry about 50% more sand than high calcium lime to produce a mortar of the same consistency and strength. The writer has noted the great cementing power of magnesia in the manufacture of artificial marble made from magnesium oxy- chloride cement and sand by a well-known formula. So that in practical use a high calcium quicklime is specially adapted for use in the finishing coat for wall plaster where ulti- mate strength is not essential. On the contrary, high magnesian quicklime is considered to be cheaper and better for sand mixtures, such as back plaster and ordinary mortar.
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