The effect of the size of grog in fire-clay bodies. . 1100146713001110 925 925142811101353162314391763185913001953182314961866191516281467 1467240016282074251823002815240019152683241722083007280822681866 749154812471624195418612296215816562617263221353007319827442200 757139510391402197516791919204715522512214918472619285923721815 Size of Grog in Fire-Clay Bodies TABLE 6Porosity of Bodies Burned to Cone 12 27 Series 1 Series 2 Series 3 Series 4 Series 5 Series 6
The effect of the size of grog in fire-clay bodies. . 1100146713001110 925 925142811101353162314391763185913001953182314961866191516281467 1467240016282074251823002815240019152683241722083007280822681866 749154812471624195418612296215816562617263221353007319827442200 757139510391402197516791919204715522512214918472619285923721815 Size of Grog in Fire-Clay Bodies TABLE 6Porosity of Bodies Burned to Cone 12 27 Series 1 Series 2 Series 3 Series 4 Series 5 Series 6 23,9 Series 7 12 -ZOl 812 GftOG Fig. 20.—Series 1. Relation between grog composition and modulus of rupture of bodies burned to cone 14 28 Technologic Papers of the Bureau of Standards In series i to 4 the modulus of rupture at cone 12 bears anapproximate relation to porosity. The strength-porosity curve(Fig. 26) consists of two parts. From body 1A (4 to 8 grog) tobodies in series 3 (12 to 80 grog) strength increased with increase ofporosity, due to small cracks which developed in drying and didnot heal in burning. In series 4 (20 to dust grog) and part of series3 strength decreased with increase of porosity, the degree of vitrifi- 8-IZ <?ro«
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