A study of the mortar making qualities of Illinois sands . ft« lb., andthe percentage of voids • Sample No. 21. (Fig. 21.) This sand isdredged from the bed of the Mississippi Riverat East St. Louis and varies but little incharacter. It is gray in color and containssome granite and flint. This is the sharpestof the natural sands, the grains being quiteirregular in shape and the edges but slightlyrounded. The grains are quite smooth, those of quartz (forming the greater part of the sand) being quite trans?parent with glassy surfaces. The sieve analysis (see Plate 21.)shows that this s
A study of the mortar making qualities of Illinois sands . ft« lb., andthe percentage of voids • Sample No. 21. (Fig. 21.) This sand isdredged from the bed of the Mississippi Riverat East St. Louis and varies but little incharacter. It is gray in color and containssome granite and flint. This is the sharpestof the natural sands, the grains being quiteirregular in shape and the edges but slightlyrounded. The grains are quite smooth, those of quartz (forming the greater part of the sand) being quite trans?parent with glassy surfaces. The sieve analysis (see Plate 21.)shows that this sand is not as well graded as some of the othersbut in spite of this it has the lowest percentage of voids. Thespecific gravity is , the weight per cu. ft. lb., andthe voids ^. Sample No. 22. (Fig. 22.) This sand istaken from the shore of Lake Michigan nearWaukegan. The character of this sand variesfrom time to time as the result of sample is dark gray in color and shows quite a variety of different components. The FIG. FIG. 21.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1910
