CONCRETE AND MORTAR CUBES.
606
Marks, 479.
Composition: Alpha Portland cement, 1; sand, 4. Water used in mortar, 48.7 per cent of cement. Age, 1 year, 1 month.
Weight per cubic foot, 119.7 pounds.
Sectional area, 145.20 square inches.
Gauged length, 5".
Applied loads.		In gauged length.		Remarks.
Total.	Per square inch.	Compres- sion.	Set.	
Pounds. 14,520 29,040 43,560 58,080 72,600 87,120 101,640 116,160 130,680 145,200 174,240 203,280 222,000	Pounds. 100 200 300 400 500 600 700 800 900 1,000 1,200 1,400 1,529	Inch. 0. .0005 .0010 .0014 .0018 .0022 .0026 .0032 .0036 .0043 .0058 .0081	Inch. 0. . 0001 .0001 . 0002 .0003 .0004 .0006 .0007 .0009 .0011 .0016 . 0027	Initial load. E=l,389,000 pounds per square inch. E=l,406,000 pounds per square inch. First crack and ultimate strength.
				
Marks, 412.
Composition: Steel Portland cement, 1; sand, 2; 21" trap rock, 4. Water used in mortar, 65.4 per cent of cement.
Age, 1 year, 2 months.
Weight per cubic foot, 152.4 pounds.
Sectional area, 144.24 square inches.
Gauged length, 5".
Applied loads.		In gauged length.		Remarks.
Total.	Per square inch.	Compres- sion.	Set.	
Pounds.	Pounds.	Inch.	Inch.	
14,424	100	0.	0.	Initial load.
28,848	200	.0015	.0012	
43,272	300	.0030	.0024	
57,696	400	.0044	.0036	
72,120	500	.0058	.0048	E=l,923,000 pounds per square inch.
86,544	600	.0074	.0061	
100,968	700	.0090	.0075	
115,392	800	.0109	.0091	
129,816	900	.0125	. 0104	E=l,875,000 pounds per square inch.
144,240	1,000	.0142	. 0118	
173,088	1,200	.0182	. 0152	
201,936	1,400	.0227	.0192	
230,784 297,000	1,600 2,059	.0276	.0235	First crack. Ultimate strength.