581
CEMENT--SET AT DIFFERENT TEMPERATURES,
RESULTS ARRANGED TO SHOW THE GAIN IN STRENGTH OF SPECIMENS WHICH SET IN AIR DIFFERENT INTERVALS OF TIME AT 39° F., ETC.—Continued.
	Time of setting in air at—				Compres-	Gain per square, inch.
Brand.	39° F.		70° F.		strength per square inch.	
	Months.	Days. 30	Months.	Days. 0	Pounds. 1,200 1,640 1,430 1,860 1,250 1,880	Pounds. i
		30		7		f- 440
	2			0		| 430
	2					
	3			2		} 630
	3			7		
		8		0		} 320
		8			842	
		14		0	649	| 252
		14		7	901	
		23		0		j• 561
		23 *		7	1,110 744	
		28		0		} 376
		28		7		
		31		0	952	
		31		7	1,040 1,310 1,230	j- 88
	3			0		
	3			7		\ -80
					656	} 91
		30 			7		
	3			0	1,100 1,190 1,110 1,600 1,700 1,980	} 90
	3					
		30				
		30				\ 490
	3			2		| 280
	3			6		
						
RESULTS ARRANGED TO SHOW THE GAIN IN STRENGTH OF SPECIMENS WHICH SET IN AIR DIFFERENT INTERVALS OF TIME AT 70° F.
Brand.	Time of setting in air.		Compres- sive strength per square inch.	Gain per square inch.
	Months.	Days.	Pounds.	Pounds.
Star			29		
		36	4,570	| 220
				
		22	290 ׳2	\ 320
		31	2,330	\ in
		38	2,320	/ 10
				
		39	2,560	[ 40
	3	0	2,430	
	3	7	2,470	
				
		38	3^450	| -450
	3	0	4,040	*
	3	9	3*160