CEMENT---.RETARDED SETS.
502
Josson 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, 30 days.
Original quantities:	Pounds.
Cement......................................................... 101
Water................................................ 30.2 per cent= 30.5
Cement in top of barrel was lumpy.
After the initial mixing no additional water was needed.
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	6.00	6.06	6.01	36.42	109,000	119,000	3,267	
0	6.00	6.01	5.95	35.75	121,200	121,200	3,390	
2	6.05	6.00	5.95	35.82	121,000	125,300	3,498	
4	6.02	6.01	5.93	35.63	139,700	139,800	3,923	
4	6.06	6.00	5.89	35.88	132,200	133,900	3,731	
6	6.01	5.97	6.02	35.93	129,900	132,800	3,696	
8	5.98	6.03	5.99	36.11	124,000	139,000	3,849	
8	4.05	4.11	3.99	16.40	59,300	59,300	3,615	
8	4.05	4.09	4.05	16.56	56,000	56,000	3,381	
8	2.03	1.96	2.04	4.00	9,720	9,720	2,430	
8	1.95	2.04	2.06	4.20	11,550	11,550	2,749