517
CEMENT--RETARDED SETS.
Storm King Portland Cement.
RETARDED SET SERIES.
Samples taken out at 2-hour intervals, with one interval of 8 hours. Main batch of cement allowed to rest undisturbed in the mixing bed after the initial gauging, excepting two occasions, 8 hours after mixing, when 4 pounds of water was added, and 11 hours after mixing, when 1.75 pounds of water was added to the main batch. Material sufficient for each lot of two 6-inch cubes was detached from the main batch, reworked, and regauged when required, just before putting into the molds. Age when tested, 3 months.
Original quantities;
Cement.....
Water......
Water was added to the individual detached batches as follows:
Pounds.
............. 382
29.3 per eent= 112
Interval after mixing.	Water used.	Interval after mixing.	Water used.
Hours.	Pounds.	Hours.	Pounds.
18	2.5	26	3
20	3	28	5
22	2.25	30	4.5
24	2.25		
Hours.	Dimensions.			Sectional area.	First crack.	Compressive strength.		Remarks.
	Height.	Compressed surface.				Total.	Per square inch.	
			Inches.	Sq. inches.	Pounds.	Pounds.	Pounds.	
0	6.04	6.00	5.99	35.94	84,000	87,800	2,443	
0	6.07	6.04	6.05	/ 36.54	92,000	93,100	2,548	
2	6.07	6.00	6.04	36.24	65,000	88,500	2,442	
. 2	6.04	6.05	6.08	36.78	63,000	93,100	2,531	
4	6.00	6.01	6.10	36.66	65,000	87,200	2,379	
4	6.00	6.02	6.03	36.30	63,500	88,100	2,427	
6	6.00	6.03	6.11	36.84	59,500	84,400	2,291	
6	5.99	6.03	6.01	36.24	89,100	89,100	2,459	
8	6.01	6.00	6.07	36.42	62,000	75,900	2,084	
8	5.99	6.06	6.10	36.97	69,700	69,700	1,885	
10	6.00	5.99	6.15	36.84	42,800	59,500	1,615	
10	6.01	5.98	6.19	37.02	56,000	61,600	1,664	
18	5.99	5.94	6.10	36.23	26,000	29,900	825	
18	6.01	6.00	6.11	36.66	26,700	28,400	775	
20	6.05	5.98	6.08	36.36	23,700	23,700	652	
20	6.00	6.00	6.10	36.60	22,300	24,200	661	
22	5.99	6.00	6.14	36.84	26,400	26,400	717	
22	6.00	6.02	6.12	36.84	22,600	22,600	613	
24	6.02	5.96	6.09	36.30	23,000	23,000	634	
24	5.98	6.00	6.08	36.48	24,300	26,200	718	
26	6.00	5.98	6.01	35. 94	18,100	18,100	504	
26	5.98	6.02	6.02	36.84	20,400	20,400	563	
28	5.96	5.99	5.93	35.52	17,800	17,800	501	
28	6.00	5.96	6.04	36.00	18,500	18,500	514	
30	5.97	6.01	6.02	36.18	13,560	13,560	375	
30	5.98	6.00	4.20	25.20	7,600	7,600	301	Part of a cube.