A study of the mortar making qualities of Illinois sands . 36. ii. FIG. 16. Samplo No. 16. (Fig. 16.) This is asample of Freeport Sandstone screenings. Thestone is rather soft which probably accountsfor the comparatively low tensile strength,(269 lb. at 90 days) the fragments frequentlybeing ruptured in the test. The sieve analy-sis (see Plate 16.) shows this sample to bedeficient in very fine material, only ^ passing the sieve. There is no suspended matter and thelack of fine material is due to the stone being composed of finequartz sand cemented together and in the crushing the grai
A study of the mortar making qualities of Illinois sands . 36. ii. FIG. 16. Samplo No. 16. (Fig. 16.) This is asample of Freeport Sandstone screenings. Thestone is rather soft which probably accountsfor the comparatively low tensile strength,(269 lb. at 90 days) the fragments frequentlybeing ruptured in the test. The sieve analy-sis (see Plate 16.) shows this sample to bedeficient in very fine material, only ^ passing the sieve. There is no suspended matter and thelack of fine material is due to the stone being composed of finequartz sand cemented together and in the crushing the grains aresimply separated and not broken up. The specific gravity , the weight per 112,2 lb., and the percentage ofvoids • Sample No. 17^. (Fig. 17.) This sand isscreened from a bank gravel found near is yellowish in color and contains someshale. The grains are rounded and are coatedwith the suspended matter of which there ^. The sieve analysis (see Plate 17.) ind-icates that while not well graded this sandis comparatively coars
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1910
