CEMENT AND MORTAK CUBES.	495
Compression Tests of Cement and Mortar Cubes.
Cubes used in the determinations of temperature acquired during setting.
Specimens which in the first loading sustained 800,000 pounds, the full capacity of the testing machine, without rupture, were reloaded, concentrating the load on a surface 10" x 10", or 8" x 8".25 on one compressed face of the cube.
Composition.			Age.	Weight.			Dimensions.			Sectional area.	First crack.	Ultimate strength.		Remarks.
Ce- ment.	Sand.	Water.		Total.		Per cubic foot.	Height.	Compressed surface.				Total.	Per square inch.	
		Per cent.	Days.	Lbs.	ozs.	Pounds.	Inches.	Inches.	Inches.	Sq. inches.	Pounds.	Pounds.	Pounds.	
Neat.		26.2	9	130	0	133.4	12.03	12.05	11.62	140.02		800,000	5,706	Not ruptured.
								12.05	11.62	140.02	1		/ 4,966	
								10.00	10.00	99.72	] 442,200	1 695,300	1 6,973	Concentrated load.
Neat.		22.5	13	131	0	133.7	12.04	12.03	11.69	140.63	i	800,000	5,689	Not ruptured.
								12.03	11.69	140.63	l	f	/ 5,020	
								8.00	8.25	66.00	1 672,000	\ 706,000	[ 10,697	Concentrated load.
Neat.		26.2	27	131	0	131.4	12.09	12.02	11.85	142.44				
											l		f 4,023	
								8. 00	8.25	66.00	1 542,000	573,000	\ 8,682	Do.
		26.2	27	135	0	135.4	12.05			143.03	'770,000 \	800,000		
										/ 143.03			f 5,593	]Concentrated load.
								10.00	10.00	\ 99.72	Ì		800,000	\ 8,022	/Not ruptured.
								12.08	11.84	143.03	1		/ 3,988	1 Concentrated load.
								8.00	8.25	66.00	/ 430,000	570,400	l 8,642	/Ruptured.
1	1	32.3	27	135	0	136.1	12.08	12.04	11.78	141.83		800,000	5,641	Not ruptured.
										141.83		»	i 4,357	
								8.00	8.25	66.00	J 618,000	t 618,000	\ 9,364	Concentrated load.
1	2	46.2	27	130	8	130.5	12.03	12.08	11.89	143.63	537,200	537,200	3,740	
1	3	56.1	27	125	8	125.6	12.06	12.03	11.90	143.16	349,500	349,500	2,441	
1	4	77.8	27	123	0	123.0	12.05	12.10	11.85	143.38	222,100	222,100	1,549	
Neat.		30.0	27	128	0	131.4	12.04	12.04	11.61	139.78	1	800,000	5,723	Not ruptured.
												f	f 4,092	
								8.00	8.25	66.00	1 490,000	X 572,000	1 8,667	Concentrated load.
Neat.		35.0	27	127	0	127.3	12.03	12.06	11.88	143.27	) 797,000	800,000	5,584	Not ruptured.
													f 3,458	
								8.00	:'8.25	66.00	1		495,500	i 7,508	Concentrated load.
Neat.		29.6	9	126	8	126.2	12.03	12.02	-11.98	144.00	450,900	450,900	3,131	Mixed with hot water.
1	1	40.6	9	130	0	130.3	12.05	11.86	-12.07	143.15	452,000	452,000	3,158	Do.
Neat.		22.7	9	137	0	137.5	12.05	12.08	1-1.83	142.91	666,100	696,200	4,872	
Neat.		38.8	13	126	0	125.1	12.04	12.07	11.98	144.60	361,000	370,500	2,562	8 hours retarded, at rest.
Neat.		29.0	13	134	0	132.2	12.04	12.02	12.10	145.44	493,000	581,200	3,996	8 hours retarded, agitated.
Neat.		32.0	13	130	8	130.7	12.07	12.06	11.85	142.91	599,200	599,200	4,193	5 hours retarded, at rest.
Brend of cement.
Alpha...............
Do..............
Do..............
Alpha...............
[Retarded 2 hours.]
Alpha.
Do
Do
Do
Do
Do
Do Do Atlas.. Do Do Do