607
CONCRETE AND MORTAR CUBES.
Marks, 475.
Composition: Alpha Portland cement, 1; sand, 3; li" to 2i" broken brick, 6.
Water used in mortar, 86.0 per cent of cement.
Age, 1 year, 1 month.
Weight per cubic foot, 125.9 pounds.
Sectional area, 144.60 square inches.
Gauged length, 5".
Applied loads.		In gauged length.		
Total.	Per square inch.	Compres- sion.	• Set.	Remarks.
Pounds.	Pounds.	Inch.	Inch.	
14,460	100	0.	0.	Initial load.
28,920	200	.0004	.0001	
48,880	300	.0008	.0002	
57,840	400	.0012	.0004	
72,300	500	.0015	. 0005	
86,760	600	.0019	.0007	E=2,083,000 pounds per square inch.
101,220	700	.0023	.0008	
115,680	800	.0026	.0010	
130,140	900	.0031	.0011	
144,600	1,000	.0036	.0013	] E=l,956,000 pounds per square inch.
173,520	1,200	.0044	.0016	
202,440	1,400	.0056	.0021	
231,360	1,600	.0068	. 0028	f E=l,389,000 pounds per square inch.
260,280	1,800	.0085	.0036	
289,200	2,000	.0104	' .0045	
318.120	2,200	.0136	.0063	First crack.
347,040 355,000	2,400 2,455	.0151	.0068	Ultimate strength.
Marks, 440.
Composition: Norton’s Rosendale cement, 1; sand, 2; 2|" trap rock, 4.
Water used in mortar, 86.6 per cent^of cement.
Age, 1 year, 2 months.
Weight per cubic foot, 147.6 pounds.
Sectional area, 144.60 square inches.
Gauged length, 5".
Applied loads.		In gauged length.		Remarks.
Total.	Per square inch.	Compres- sion.	Set.	
Pounds.	Pounds.	Inch.	Inch.	
14,460	100	0.	0.	Initial load.
28,920	200	.0022	.0018	
43,380	300	.0065	.0056	
57,840	400	.0119	.0106	
72,300	500	.0186	.0168	First crack.
86,760	600	.0258	.0233	
117,700	814			Ultimate strength.