CONCRETE AND MORTAR CUBES.
604
Marks, 171.
Composition: Alpha Portland cement, 1; sand, 3; f״ trap rock, 6. Water used in mortar, 72.8 per cent of cement.
Age, 1 year.
Weight per cubic foot, 139.6 pounds.
Sectional area, 144.00 square inches.
Gauged length, 5".
Applied loads.		In gauged length.		
Total.	Per square inch.	Compres- sion.	Set.	Remarks.
Pounds. 14.400 28,800 57,600 86.400 115.200 144.000 172,800 201,600 230,400 259.200 288.000 314,000	Pounds. 100 200 400 600 800 1,000 1,200 1,400 1,600 1,800 ׳ 2,000 2,180	Inch. 0. .0002 .0007 .0013 .0022 .0032 .0050 .0071 .0093 .0128 .0185	Inch. 0. 0. .0001 . 0002 .0006 .0010 .0019 .0029 . 0042 . 0062 .0103	Initial load. E=2,273,000 pounds per square inch. 1 E=2,045,000 pounds per square inch. (e=833,000 pounds per square inch. First crack and ultimate strength.
				
Marks, 181.
Composition: Alpha Portland cement, 1; sand, 4; f" trap rock, 8. Water used in mortar, 104.8 per cent of cement.
Age, 1 year.
Weight per cubic foot, 138.3 pounds.
Sectional area, 144.36 square inches.
Gauged length, 5".
Applied loads.		In gauged length.		
Total.	Per square inch.	Compres- sion.	Set.	Remarks.
Pounds. 14,436 28,872 43,308 57,744 72,180 86,616 101,052 115,488 129,924 144,360 158,796 173,232 187,668 202,104 215,800	Pounds. 100 200 300 400 500 600 700 800 900 1,000 1,100 1,200 1,300 1,400 1,495	Inch. 0. .0003 .0008 .0014 .0021 .0030 .0041 .0053 .0073 .0095 .0118 .0166 .0208 .0296	Inch. 0. 0. .0001 .0003 .0007 . 0012 .0019 .0025 .0038 .0053 .0073 .0112 . 0138 .0214	Initial load. E=l,389,000 pounds per square inch. E=l,071,000 pounds per square inch. First crack and ultimate strength.