505
CEMENT--RETARDED SETS.
Bonneville Improved, Natural Cement.
RETARDED SET SERIES.
Samples taken out at 2-hour intervals, excepting the first and last hours. 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, 34 days, excepting the 7-hour samples, which were 35 days old.
Pounds.
.............66.75
42.7 per cent= 28.5
Original quantities:
Cement........
Water.........
Water added to the main batch as follows:
Interval after mixing, hours.	Water used.	
	Pounds.	Per cent, approximate.
	28.5 4.5	42.7 52.1
		
		
No more water was needed in this batch.
	Dimensions.			Sectional area.	First crack.	Compressive strength.		Remarks.
Hours.	Height.	Compressed surface.				Total.	Per square inch.	
0	Inches. 5.98	Inches. 6.03	Inches. 6.14	So. inches. 37.02	Pounds. 32,900	Pounds. 33,800	Pounds. 913	
	5.97	6.02	6.15	37.02	28,300	32,500	878	Voids.
1	5.97	6.03	6.02	36.30	10,500	11,700	322	
2	6.03	5.93	6.02	35.70	8,400	13,800	387	
4	6.01	5.93	5.96	35.34	9,900 •	13,700	388	
6	6.05	5.99	5.98	35.82	13,600	13,900	388	
7	4.00	4.01	3.95	15.83	4,600	6,480	409	
7	4.01	3.99	3.97	15.84	6,200	6,900	435	
7	4.00	4.06	3.98	16.15	6,300	6,950	430