608	CONCRETE AND MORTAR CUBES.
Marks, 447.
Composition: Alpha Portland cement, 1; sand, 2; H” to 3״ pebbles, 4.
Water used in mortar, 49.8 per cent of cement.
Age, 1 year, 2 months.
Weight per cubic foot, 148.8 pounds.
Sectional area, 144.96 square inches.
Gauged length, 5".
Applied loads.		In gauged length.		
Total.	Per square inch.	Compres- sion.	Set.	Remarks.
Pounds.	Pounds.	Inch.	Inch.	
14,496	100	0.	0.	Initial load.
28,992	200	.0002	0.	
48, 488	300	.0005	.0002	
57,984	400	. 0008	. 0002	
72,480	500	.0011	.0004	
86,976	600	.0013	. 0005	E. =3,125,000 pounds per square inch.
101,472	700	. 0016	.0007	
115,968	800	.0019	.0007	
130,464	900	.0022	.0009	
144,960	1,000	.0024	.0009	IE. =3,000,000 pounds per square inch.
173,952	1,200	.0031	.0011	
202,944	1,400	.0038	.0013	
231,936	1,600	.0045	.0016	|E. =2,000,000 pounds per square inch.
260,928	1,800	. 0053	.0019	
289,920	2,000	.0063	.0023	‘ \
318,912	2,200	.0071	.0024	
347,904	2,400	.0078	.0026	
376,896	2,600	.0093	.0032	
405,888	2,800	.0110	.0038	First crack.
434,880	3,000	.0135	. 0051	
463,872 492,864	3,200 3,400	.0186	.0083	Ultimate strength.
Marks, 461.
Composition: Alpha Portland cement, 1; sand, 2; 11" to %¡" broken brick, 4.
Water used in mortar, 54.3 per cent of cement.
Age, 1 year, 2 months.
Weight per cubic foot, 130.6 pounds.
Sectional area, 144.72 square inches.
Gauged length, 5".
Applied loads.		In gauged length.		
Total.	Per square inch.	Compres- sion.	Set.	Remarks.
Pounds.	Pounds.	Inch.	Inch.	
14,472	100	0.	0.	Initial load.
28,944	200	. 0002	0.	
43,416	300	. 0004	. 0001	
57,888	400	. 0006	. 0001	
72,360	500	.0008	.0002	
86,832	600	.0007	. 0003	E=6,250,000 pounds per square inch.
101,304	700	.0013	.0004	
115,776	800	.0015	. 0004	
130,248	900	.0019	. 0005	
144,720	1,000	.0021	.0006	E=3,000,000 pounds per square inch.
173, 664	1,200	. 0029	. 0009	
202, 608	1,400	. 0036	.0010	
231,552	1,600	. 0041	.0011	E=l,923,000 pounds per square inch.
260,496	1,800	.0049	. 0014	
289,440	2,000	. 0058	.0017	
318,384	2,200	.0069	.0022	
347,328	2,400	.0083	. 0030	
376,272	2,600	.0101	.0040	
405,216	2,800	. 0119	.0050	
434,160	3,000	.0144	.0069	First crack.
463,104 501,000	3,200 3,462	.0195	.0107	Ultimate strength.