499
CEMENT--RETARDED SETS,
Storm King Portland Cement.
RETARDED SET SERIES.
Samples taken out at 2-hour intervals. Main batch of cement allowed to rest undisturbed in the mixing• bed between the times of taking out samples, or when regauging. Age when tested, 31 days.
Original quantities:	Pounds.
Cement..........................................................93.5
Water................................................ 29.4 per cent27.5 ־
Water added to the main batch as follows:
Interval after mixing, hours.	Water used.	
	Pounds.	Percent, approxi- mate.
	27.5 .75 .5 1 .75	29.4 30.4 31.6 34.2 37.6
2					
4	v		
6			
8			
		
Hours.	Dimensions.			Sectional area.	First crack.	Compressive strength.		Remarks.
	Height.	Compressed surface.				Total.	Per square inch.	
	Inches.	Inches.	Inches.	Sq. inches.	Pounds.	Pounds.	Pounds.	
0	6.08	5.98	6.06	36.23	63,600	65,500	1,802-	
0	6.00	6.01	5.99	36.00	54,500	64,200	1,783	
2	6.06	6.00	6.00	36.00	48,600	57,600	1,599	
4	5.99	6.04	6.07	36.67	52,500	56,200	1,532	
4	6.06	6.00	6.11	36.66	51,600	53,500	1,459	
6	6.03	5.97	6.06	. 36.20	41,500	41,700	1,151	
8	6.03	5.99	6.08	36.41	27,300	28,808	791	
8	4.02	4.01	4.06	16.29	12,900	13,300	816	
8	1.92	2.01	2.07	4.17	2,850	2,850	683