Abstract
Abstract Silicate cement mortars, consisting of a chemically inert solid filler containing a fluoride setting agent and a liquid sodium or potassium silicate binder, have been used for many years in acid-proof construction for high temperature, strong acid service. While silicate cements have performed well under unusually tough conditions, they are not without their shortcomings in sulfuric acid service. Instances of corrosive attack are explained by breakdown of the setting agent and hydrate or alum formation. A new material of construction, a silica cement mortar, has been developed which shows promise in sulfuric acid service. The binder is a silica sol instead of a solution of a sodium or potassium silicate which is alkaline. The setting agent permits an orderly gelation of silica resulting in a strong mortar. Unit cell dimensions are given for a number of sulfates and alums. Seven physical properties are listed and compared for sodium silicate mortar, potassium silicate mortar and silica mortar. The comprehensive strengths of these three materials after immersion in sulfuric acid are reported. 6.6.5
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