By Gregorio Millán Barbany
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6%. 0%. 0%. 2%. Si02 content should be approximately 20% or 22%. Cao content should be approximately 63% or greater than 66%. A few respondents requested a low-iron, high-alumina cement, while a few other respondents wanted higher levels of trace elements (such as Cr, Zn, and Mn) than appeared in the "600 series" SRM. Several respondents suggested use of cements with which they were familiar, none of which appeared to satisfy the majority's requests. Therefore, it was decided to locate two or more cements that either alone or blended together would meet the needs of the majority of surveyed respondents.
E. Foster, R. E. Michaelis, and C. L. Stanley. C. 20234 December 15, 1983 (Revision of certificates dated 2-24-77 and 6-12-74) Stanley D. Rasberry, Chief Office of Standard Reference Materials (Over) 49 HOMOGENEITY TESTING: Measurements were made at NBS on the portland cement supplied by the Penn-Dixie Cement Corp. by S. D. Rasberry, M. M. Darr, and J. McKay by x-ray fluorescence analysis. The cement was sampled at 16 locations and two briquettes were prepared for each one. Calcium and sulfur, chosen as key elements for checking inhomogeneity, were determined by making four independent measurements on each briquette.
DEFINITIVE ANALYSIS PROGRAM OF THE PORTLAND CEMENT CORPORATION: "Wet" chemical gravimetric methods were used for the major constituents CaO, Si02, A120 3 and MgO. ) Fe20 3 was determined by dichromate titration and S03 by precipitation in an acid solution after removal of the ammonium hydroxide group and silica. Atomic absorption spectroscopy technique~ were used for JSO, N~O, SrO, Mnio3, ZnO and Cr2o 3• Colorimetric techniques were used to determine Ti02 and P 20 5 while fluoride was determined by an ion selective electrode method.
Aerothermochemistry by Gregorio Millán Barbany