521
CEMENT--RETARDED SETS,
Josson Portland Cement.
RETARDED SET SERIES, GROUTS.
Original quantities: Cement, 90.5 pounds; water, 44 pounds=48.6 per cent.
Mixed and allowed to remain over night, 15 hours, in the mixing-bed. Four and one-half pounds surplus water removed in the morning, leaving 39.5 pounds=43.7 per cent, in the mixture. Worked over and put into the molds. Age when tested, 30 days.
	Dimensions.					Compressi vestrength.		
Num- ber.	Height.	Compressed surface.		Sectional area.	First crack.	Total.	Per square inch.	Remarks.
1	Inches. 6.00	Inches. 6.08	Inches. 6.06	Sq. inches. 36.84	Pounds. 71,000	Pounds. 72,800	Pounds. 1,976	
2	6.07	6.00	6.02	36.12	76,800	76,800	2,126	
S	6.05	5.99	6.03	36.11	72,000	73,600	2,038	
4	6.03	6.02	5.89	35.45	77,100	77,100	2,174	
5	6.05	6.00	6.07	36.42	72,100	72,100	1,979	
6	6.01	5. 99	6.10	36.53	76,000	76,000	2,080	
7	6.00	6.02	5.92	35.63	82,100	82,100	2,304	
8	6.07	6.05	6.08	36.79	74,300	74,300	2,019	
Steel Slag Cement.
RETARDED SET SERIES, GROUTS.
Original quantities: Cement, 84.5 pounds; water, 43 pounds = 50.9 per cent.
Mixed and allowed to remain over night, 15 hours, in the mixing bed. Worked over in the morning and put into 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	6.02	5.97	6.03	36.00	19,200	20,200	561	
2	5.99	6.03	6.02	36.30	20,100	20,600	567	
3	5.97	6.02	6.05	36.42	19,520	19,520	536	
4	6.03	6.02	5.99	36.05	18,600	18,700	519	
5	6.02	6.05	6.05	36.60	20,500	20,500	560	
6	5.96	6.01	6.06	36.42	19,700	19,700	541	
7	5.97	6.01	6.07	36.49	20,600	20,600	565	
8	6.00	5. 98	6.09	36.41	21,300	21,300	585	
	4.02	4.03	3.97	15.95	7,680	7,680	482	
1	1.94	2.02	2.01	4.07	1,170	1,360	334	
2	1.93	2.06	2.01	4.14	1,420	1,580	382	
3	2.02	1.96	2.05	4.01	1,560	1,560	389	
4	2.02	1.94	2.02	3.91	1,720	1,740	. 458	Voids.
5	2.01	1.93	2.04	3.93	1,460	1,510	384	Do.