579
CEMENT---SET AT DIFFERENT TEMPERATURES,
RESULTS ARRANGED TO SHOW THE GAIN IN STRENGTH OF SPECIMENS WHICH SET IN AIR DIFFERENT INTERVALS OF TIME AT 0° F., FOLLOWED BY INTERVALS AT 70° F.
	Time of setting in air at—				Compres- sive	Gain per square inch.
Brand.	0° F.		70° F.		strength per square inch.	
	Months.	Bays. 31	Months.	Bays. 1	Pounds. 1,350	Pounds.
		31		7	2,340 1,720 2,690	| 990
	3			1		} 970
	3			7		
		5		1		)■ 559
		5		7		
		14		1	321	} 679
		14		7	1,000 337	
		21		1		j■ 673
		21		7	1,010 383	
		31		1		J■ 598
		31		7	981	
	2			1	416	| 565
	2			7	981	
	3			1	497	} 513
	3			7	1,010	
		30		1	749	| 561
		30		7	1,310 703	
	3			1		} 587
	3			7	1,290 986 2,440 1,210 2,350 315 1,470 231	
		30				}• 1,454
		30		7		
	3			1		| 1,140
	3			7		
		7				} 1,155
		7		7		
		14		1		} 999
		14		7	1,230 185	
		21				| 1,065
		21			1,240 347	
		29		1 .		} 1,083
		29		7	1,430 624	
	3			1		} 896
	3			7	1,520	
		30				} 210
		30		7	448	
	3			1	241	} 99
	3			7	340	
		32				| 492
		32		7	903	
	2			1	446	J- 396
	2			7	842	
	3			1	478	| 332
	3			7	810	
		6				| 185
		6		7	354	
		15		1	182	} 278
		15		7	460	
		20		1	168	} 263
		20		7	431