The effect of the size of grog in fire-clay bodies. . SQsOUST GROG GROG Fig. 14.—Series J. Relation between grog composition and modulus of rupture of rawbodies. Clay composition: All Illinois Kaolin 3CO 9AB 4-E *J, 4G, AH • Aft <*H -r^? AM 31 3D« ?S &&M « AQ AH* 200 3F \A* 31 Zrif«/1M |1P Tib 100 *ia 8 io ie %a 1© 1a SURFACE FACTOR OF GROG 20 ee 24- Fig. 15.—Relation between surf ace factor and modulus of rupture of raw bodies Size of Grog in Fire-Clay Bodies 23. SO OUST -4-OSO Fig. 16.—Series 4. Relation between grog composition and porosity of raw bodies *300 • i V) ©G
The effect of the size of grog in fire-clay bodies. . SQsOUST GROG GROG Fig. 14.—Series J. Relation between grog composition and modulus of rupture of rawbodies. Clay composition: All Illinois Kaolin 3CO 9AB 4-E *J, 4G, AH • Aft <*H -r^? AM 31 3D« ?S &&M « AQ AH* 200 3F \A* 31 Zrif«/1M |1P Tib 100 *ia 8 io ie %a 1© 1a SURFACE FACTOR OF GROG 20 ee 24- Fig. 15.—Relation between surf ace factor and modulus of rupture of raw bodies Size of Grog in Fire-Clay Bodies 23. SO OUST -4-OSO Fig. 16.—Series 4. Relation between grog composition and porosity of raw bodies *300 • i V) ©G •J • B • F^-» M • CL250 •^*~^-^ n • 3> • H K • I* O • ©I P • qT200 *• * •C ^^_ • A % 15° * 100 27 Percent Porosity 30 Fig. 17.—Series 4. Relation between modulus of rupture and porosity of raw bodies 24 Technologic Papers of the Bureau of Standards The Illinois kaolin had less bonding power when coarse grog wasused and more when fine grog was employed than had the fire are at least two reasons for this. The kaolin in the plasticcondition is somewhat like putty, while the fire clay has more of asticky nature and contains more colloidal material. If this werethe only factor, all the bodies in series 7 should have been weakerthan the corresponding bodies in series 5. But this was not thecase. For example, body yM had times the strength of only way to account for this is by assuming that the kaolinc
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