574	CEMENT----SET AT DIFFERENT TEMPERATURES.
MEAN RESULTS WITH 2-INCH CUBES—Continued.
Brand.	Class.	Composition.			Time of setting in air at temperature of—						Compres- sive strength per square inch.
		Ce- ment.	Sand.	Water.	0° F.		39° F.		70° F.		
	Natural...	Neat.		Per ct. 38.6	Mos.	Days. 32	Mos.	Days.	Mos.	Days. 1	Pounds. 225 562
				38.6		32				7	
				38.6		32				14	
				38.6	3					1	274 516 674 1,110 1,600 1,810 1,700
				38.6	3					7	
				38.6	3					14	
	Natural...	Neat.		36.2				30			
				36.2				30		7	
				36.2				30		14	
				36.2			3			2	
				36.2 36.2 36.2			3			6	
							3			13	2,150 1,560 1,470 1,650 1,240 1,400 1,480
	Natural...	Neat.								30	
				36.2					1	7	
				36.2					1	14	
				36.2					3	3	
				36.2					3	7	
				36.2					3	14	
											
RESUME OF RESULTS ON SPECIMENS 1 MONTH OLD.
[Specimens exposed to 0° P. temperature while setting, followed by one day in air at 70° F. before
testing.]
Brand.	Compressive strength per square inch, specimens set in air at temperatures of—		
	0° F.	39° F.	70° F.
	Pounds. 1,350 383 749 986 347 229 238 411 206 341 225	Pounds. 2,980 1,960 1,600 5,250 4,000 1,320 806 1,200 744 656 1,110	Pounds. 4,350 2,330 2,520 3,900 3,970 1,200 724 1.140 1.140 al, 000 1,560
			
			
			
			
			
			
			
			
			
			
			
	497	1,966	2,167
			
« Approximate.