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SULFUR (CEMENTS By WERNER W. DUECKER * *^
Sulfur as such cnvin various combinations, particularly as sulfirf^gj^ cements, has been used as a sealing compound or bonding agent for many years. Although such cements have been known for a long time,, the technical literature 1'25'28 reveals but little information regarding their physical characteristics and utility. In the present paper these data will be presented ; and, in addition, there will be given a description of a comprehensive research that had for its aim tbe development of a new type of sulfur cements, evolved primarily for the purpose of satisfying a wide range of industrial requirements.
At first, because of its inertness, ease of application, and strengths sulfur was probably used per se, particularly as a bonding material. It was employed to set iron hand rails in stone. Holley 15 notes an instance in which a generator engine at a mine had become loose in its base. It was impossible to shut down the works and make extensive repairs. So the engine was jacked up, the foundation cleaned with air, a shallow trench dug in the concrete engine bed, and the trena%-s filled with molten sulfur. When the sulfur had cooled, the engine was started and, with such anchorage, operated satisfactorily for more than three years. At present acid-pickling tanks, constructed entirely , of sulfur, are giving excellent service. v
Although sulfur can be used as such, its strength as a bonding agent can be increased by the admixture of coal,2 sand,-'4 pumice.8 and other materials.111417';!1 Peculiar characteristics can be impa-'-d to it by the addition of bitumens,4'7'8'9'16'29-33 metallic sulfides,20--2'27'30 and fibrous materials.21'32 In some instances iron filings 3,13 am' ammonium chloride 5 have been added to sulfur, particularly for use in ic. ;ng iron pipes. These latter cements owe their strength not only
o the action of the sulfur itself but also to the formation of iron •
ulfidc in situ.
\\ nile certain of these products had been known for years, it was . nt until the work of Bacon and Davis 1 was reported that attention * Senior Fellow, Mellon Institute of Industrial Research, Pittsburgh, Pa.