A study of the mortar making qualities of Illinois sands . ely composed ofclay and adheres very tightly to the grains,fully half of it normally coating them, mak- PIG. 18a. ing it almost impossible to determine thecomposition. On wetting the clay becomesgummy and the loose portion unites with theother making it impossible to wash the sus-pended matter out without thoroughly scrub-bing it. The specific gravity is , theweight per cu. ft. lb., and the per-centage of voids . FIG. 18b. Sample No. 18W. (Fig. 18b.) This sand is the same sand asSample No. 18 with the exception that it h
A study of the mortar making qualities of Illinois sands . ely composed ofclay and adheres very tightly to the grains,fully half of it normally coating them, mak- PIG. 18a. ing it almost impossible to determine thecomposition. On wetting the clay becomesgummy and the loose portion unites with theother making it impossible to wash the sus-pended matter out without thoroughly scrub-bing it. The specific gravity is , theweight per cu. ft. lb., and the per-centage of voids . FIG. 18b. Sample No. 18W. (Fig. 18b.) This sand is the same sand asSample No. 18 with the exception that it has been thoroughlywashed (^ removed). In washing it undergoes quite a visiblechange, apparent to some extent in the photographs. (CompareFigs. 18a and 18b,) The color changes to gray and the grainsI are shown to be quite irregular in shape. In fact this is thesharpest of the sands tested with the exception of Sample No. is considerably less quartz than usual, fully half of thegrains consisting of limestone, granite, shale and ocheroue
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1910
