6O2 CLAY, ROAD MATERIALS, ETC. 



Lime ., 1-45 0.14 



Sodium 0.15 0.36 



Potassium 1.39 1.40 



Water 1-45 2.00 



Titanium 0.55 0.95 



Phosphorus trace trace 



100.61 99.53 



"The yellow clay by rational analysis shows: 



Per cent. 



Free silica 57.20 



Feldspar 6 . 00 



Clay substance 36.80 



"Mechanical Analyses. 



Range in 

 millimetres. Yellow clay. Red clay. 



Fine clay 0.00 to .001 15.85 20.75 



Coarse clay 001 to .005 11.00 12.10 



Silt .005 to .020 23.80 28.25 



Fine sand 020 to .15 28.10 32.70 



Coarse sand 15 to 4.00 19.80 4.20 (to 1.00) 



Water 1.25 2.00 



"The yellow clay slakes in thirty seconds and requires 23 per cent, 

 of water to develop a normal molding consistency. It is unaffected at 

 cone 1 (2102 F.) and is vitrified at cone 5 (2246 F.) becoming viscous 

 at cone 14 (2570 F.). Its fire shrinkage is 9 per cent. 



"The red clay is unaffected at cone 05 (1922 F.), reaches incipient 

 vitrification at cone 1 (2102 F.), and complete vitrification at cone 5 

 (2246 F.), with a fire shrinkage of 10 per cent. It is viscous at cone 

 10 (2426 F.)" 



Samples of both materials from this clay pit were sent by 

 Dr. Keener to State Road Engineer A. D. Williams, who has 

 had mechanical tests made of them, which he reports as fol- 

 lows: 



Red Shale. 



"No. 102. Received June 16, 1915. Name, Weston Brick Works. 

 Date sample mixed, Aug. 15, 1915. Pressed, Aug. 29th. Put in kiln, 

 Sept. 25th. Position in kiln, top. Time of burning, 288 hours. Tem- 

 perature about 2200 F. Removed from kiln, Oct. 14th. Kind of 

 brick, Testing Specimens. Colors and general appearance-, red. Di- 

 mensions of brick 2"x3%"xiy 2 ". 



Transverse Test. Crushing Test. 



Distance Between Supports 7". 



Break- Modulus Area Breaking Load. 



No. Dimen- How ing of of Lbs. per 



sions. Set Load Rupture Section Total sq. inch 



1 2.3x3.6x7.5 Edge 5840 Shear 3 3 / 4x7 1 / 2 344850 12261 



2 1.9x3.6x7.5 Edge 5390 Shear WzX-lVz 340600 12594 



3 1.9x3.5x7.? Edge 9790 Shear 3%x7% 315370 12014 



