By Richard A. Kuntze
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Additional info for The Chemistry and Technology of Gypsum: Asymposium (Astm Special Technical Publication Stp)
Sample text
From all pores, whereas a portion remains filled when oven dried depending on the temperature and relative humidity. In summary, it was shown that (1) improper drying results in erroneous composition, (2) the physical and chemical characteristics of the samples must be taken into account when designing a drying procedure. (3) the drying conditions must match the character of the sample, and (4) use of microwave drying seems to overcome the difficulties in matching the properties of the sample and the drying conditions.
Natural Anhydrite Natural anhydrite is orthorhombic with good cleavage. It is almost always seen as blocky crystals with 90° comers. 528 Rl to make the gypsum disappear (Fig. 23). m will show some color. As a matter of fact anhydrite is very colorful in the sizes we ordinarily encounter and is easy to recognize. It has parallel extinction that helps to confirm our identification (Fig. 15). Copyrighted material 36 CHEMISTRY AND TECHNOLOGY OF GYPSUM $£ :0 % ' "! * ft * ; 4 iioo/^m 1 . FIG. 18—Ground rock gypsum.
Although the test conditions and procedure may differ, the gypsum phase analysis methods consist of two basic steps: 'Research associates. United States Gypsum Company. Graham J. Morgan Research Center, 700 North Highway 45, Libertyville, IL 60048. 48 Copyrighted material TURK AND BOUNINI ON SORBED WATER 49 TABLE 1—Removal of free water by oven drying. Sample Weight, g Country Source (/) United States Germany Spain ASTM C 471* DIN 1168-1955 UNE 7065 F. Paris and C. Lopez EXCO VP-319/1%3 NF-B-12-401 UNI 5371-64(G)' UNI 6782-71(H)' ISO 3052-1074 Piece 1952 GP23 Portugal France Italy International Switzerland Rilem 50 4000 50 100 100 10 100 100 100 5 100 Drying Temperature.