CEMENT--RETARDED SETS,
520
Alpha Portland Cement.
RETARDED SET SERIES, GROUTS.
Original quantities: Cement, 97 pounds; water, 43.5 pounds=44.9 per cent.
Mixed and allowed to remain over night, 15 hours, in the mixing bed.
One pound of surplus water removed in the morning, leaving 42.5 pounds=43.9 per cent, in the mixture. Worked over and put into the molds.
Age when tested, 30 days.
Num- ber.	Dimensions.			Sectional area.	First crack.	Compressive strength.		Remarks.
	Height.	Compressed surface.				Total.	Per square inch.	
	Inches.	Inches.	Inches.	Sq. inches.	Pounds.	Pounds.	Pounds.	
1	6.05	6.00	6.02	36.12	128,700	128,700	3,563	
2	6.05	6.06	6.09	36.90	123,900	124,500	3,373	
3	6.00	6.05	6.00	36.67	95,000	123,500	3,367	
4	5.99	6.01	6.00	36.42	122,000	135,000	3,706	
5	6.05	6.03	6.07	36.60	128,000	129,000	3,524	
6	6.00	6.03	6.00	36.18	119,500	119,500	3,302	
7	6.01	6.02	6.08	36.60	120,800	121,200	3,311	
.8	6.00	6.02	5.98	36.00	133,000	133,000	3,694	
1	4.02	4.04	4.03	16.29	52,600	52,600	3,228	
2	4.03	4.03	4.00	16.12	51,000	55,300	3,430	
Dyckeriioff Portland Cement.
RETARDED SET SERIES, GROUTS.
Original quantities: Cement, 100.5 pounds; water, 43.5 pounds= 43.3 per cent.
Mixed and allowed to remain over night, 15 hours, in the mixing bed. Worked over in the morning and put into molds. No water needed. Age when tested, 31 days.
	Dimensions.					Compressivestrength.		
Num- ber.	Height.	Compressed surface.		Sectional area.	First crack.	Total.	Per square inch.	Remarks.
	Inches.	Inches.	Inches.	Sq. inches.	Pounds.	Pounds.	Pounds.	
1	6.03	5.99	5.95	35.64	80,200	80,200	2,250	
2	6.00	6.02	5.97	35.93	71,000	72,500	2,017	
3	5. 99	6.09	5.85	35.62	77,600	77,600	2,178	
4	5.99	6.05	5.86	35.45	77,800	77,800	2,194	
5	6.00	6.06	6.00	36.36	67,000	69,400	1,908	
6	6.06	5.98	5.86	35.04	73,900	73,900	2,108	
7	6.00	5.91	6.02	35.58	71,900	71,900	2,020	
8	6.04	5.98	5.88	35.17	78,500	78,500	2,231	
	4.03	4.06	3.91	15.88	37,600	38,000	2,392