CEMENT--RETARDED SETS,
512
Stab Portland Cement.
RETARDED SET SERIES.
Additional tests after setting longer periods in air af ordinary and at low temperatures.
The intervals during which these samples were exposed to 0° F. temperature were preceded by setting in air at about 70°• F. periods of 3 or 4 days each. This short period occurred immediately after mixing. After exposure to low temperatures the samples remained at about 70° F. the different intervals stated in the details of the tests.
CEMENT, WITH PLASTER.
		Time of setting in air								Compressive		
		at temperatures of—								strength.		
	Hours								Sec-			
Marks.	re-								tional			Remarks.
	tarded.	0° F.		70° F.		Height.	Compressed surface.		area.	Total.	Per square inch.	
		Mos	Days.	Mos	Days.	Ins.	Ins.	Ins.	Sq. ■in.	Pounds.	Pounds.	
J 17	72	4			4	1.98	1.98	2.00	3.96	2,270 1,700	573 421	
						2.03	2.00	2.02	4.04			
						1.98	2.01	2.00	4.02	2,040	507	
			•			2.03	2.01	2.03	4.08	2,200	539	
						2.00	2.00	2.01	4.02	2,800	696	
J 17	72			4		1.99	1.98	2.01	3.98 3.98	1,540 1,400	387 352	
						1.98	1.97	2.02				
						1.99	1.99	1.99	3.96	1,210	306	
						1.99	2.00	2.01	4.02	1,640	408	
						2.01	1.99	2.02	4.02	1,480	368	
J 17	72	4		1		1.99	1.99	2.00	3.98 4.00	2,490	626 513	
						1.97	1.99	2.01		2,050		
						1.98	1.99	2.01	4.00	2,940	735	
						2.02	2.00	1.97	3.94	1,900	482	
						1.94	1.98	2.00	3.96	2,380	601	
J 17	72	5			1	1.98	1.95	2.00 2.00	3.90	2,040 1,380	523 347	
						1.98	1.99		3.98			
						2.00	1.99	1.98	3.94	1,770	449	
						1.96	2.00	1.99	3.98	1,720	432	
						2.02	2.00	1.98	3.96	1,730	437	
J 17	72			5		1.98	2.00	1.96 2.00	3.92 4.08	2,500 1,980	638 485	
						1,98	2.04					
						1.98	2.00	1.97	3.94	1,800	457	
						1.97	1.99	1.99	3.96	1,810	457	
						1.97	1.98	1.97	3.90	2,490	638	
J 17	72			5		1.96	1.96 1.96 2.01 2.00	1.99 2.00 2.00 1.99	3.90 3.92 4.02 3.98	2,200 2,590 2,250 2,400	564 661 560 603	1 Heated at 110°
						1.97 1.98 1.98						C. to a con-1 stant weight | before testing. JLoss=19perct.
						1.96	1.98	2.00	3.96	2,200	556	
J 17	72	4		2		2.03	1.97	2.00 1.99	3.94	2,150 2,180	546 545	
						2.03	2.01		4.00			
						1.94	1.99	1.99	3.96	2,000	505	
						1.98	2.01	1.98	3.98	1,700	427	
J 17	96	4			4	2.00	2.08	2.02 2.03	4.20 4.14	1,990 2,120	474 512	
						2.00	2.04					
						2.01	2.03	2.00	4.06	2,080	512	
						2.00	2.06	2.06	4.24	1,300	307	
						2. 00	2.09	2.02	4.22	2,320	550	
J 17	96			4		2.05 2.00	2.01 1.98	2.02 2.01	4.06 3.98	1,100 1,180	271 296	
												
						2.06	2.00	2.00	4.00	1,210	303	
						2.03	2.00	1.99	3.98	1,000	251	
						2.04	2.00	2.00	4.00	1,110	278