Compres-
sive
strength
per
square
inch.
Pounds. 3,370
3.350
3.110
89
369
539
68
387
531
52
412
520
229
735
823
237 558 648
926
1.480 1,460
1.110
1.490
1.490 1,320 1,450 1,550
1,160
1,240
1,310
1,200
1.250 1,220 1,410
238 448 467 241 340 482
806
1,020
1.350 1,030 1,360
1.480
724
730
752
661
639
580
411
903
1,010
446
842
1,050
478
810
1,020
1,200
1,640
1,860
1,430
1,860
1,970
1.250
572	CEMENT----SET AT DIFFERENT TEMPERATURES.
MEAN RESULTS WITH 2-INCH CUBES—Continued.
Brand.	Class.	Composition.			Time of setting in air at temperature of—					
		Ce- ment.	Sand.־	Water.	0° F.		39° F.		70° F.	
				Per c.t.	Mos.	Days.	Mos	Days.	Mos	Days.
				26.0					1	7
				26.0					1	13
				26.0					3	
		Neat.		36.2		7				
				36.2		7				
				36.2						
				36.2		14				
				36.2		14				
				36.2		14				
				36.2						
				36.2		'21				
				36.2		21				
				36.2		33				
				36.2		33				
				36.2		33				
				36.2	3					
				36.2	3					7
				36.2	a					15
					34.4				15		
				34.4						
				34.4						14
				34.4						
				34.4						
										14
				34.4				32		
				34.4				32		7
				34.4				32		
				34.4						15
				34.4						
				34.4						
				34.4						32
				34.4						
				34.4						9
				34.4						16
				36.7		30				
				36.7		30				7
				36.7		30				
				36.7	3					
				36.7	3					
				36.7	3					14
				37.1				30		
				37.1				30		7
					37.1				30		14
				37.1			3			
				37.1			3			7
				37.1			3			15
				37.1						30
				37.1						37
				37.1						14
				37.1					3	
				37.1					3	8
				37.1					3	15
				38,4		32				1
improved.				38.4		32				7
				38.4		32				
				38.4	2					
				38.4	2					7
				38.4	2					14
				38.4	3					1
				38.4	3					7
				38.4	3					14
				35.9				30		
				35.9				30		
				35.9				30		14
				35.9			2			
				35.9			2			7
				35.9			2			14
				35.9			3			2