The effect of the size of grog in fire-clay bodies. . 60 OUST GROG 20-80 GfcOG Fig. 13.—Series 6. Relation betweengrog composition and modulus of rupture for rawbodies. Clay composition: Equal parts fire clay and Georgia kaolin The same ratio of grog sizes occurs in the bodies in series 6 and7 as in series 5. The clay composition, however, is different ineach of the three series. In series 6 the theory of the filling ofvoids applies as well as in series 5. The only difference to benoted is that the addition of Georgia kaolin decreased the strengthto about 60 per cent of that of bodies in which
The effect of the size of grog in fire-clay bodies. . 60 OUST GROG 20-80 GfcOG Fig. 13.—Series 6. Relation betweengrog composition and modulus of rupture for rawbodies. Clay composition: Equal parts fire clay and Georgia kaolin The same ratio of grog sizes occurs in the bodies in series 6 and7 as in series 5. The clay composition, however, is different ineach of the three series. In series 6 the theory of the filling ofvoids applies as well as in series 5. The only difference to benoted is that the addition of Georgia kaolin decreased the strengthto about 60 per cent of that of bodies in which the clay was allfire clay. The results in series 7 were rather surprising when comparedwith those of series 5. The clays in both wrere plastic bond clays. 22 Technologic Papers of the Bureau of Standards. 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
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