CEMENT--RETARDED SETS
508
STAR PORTLAND CEMENT, WITH PLASTER.
	Dimensions.			Sectional area.	First crack.	Compressive strength.	
Hours.	Height.	Compressed, surface.				Total.	Per square inch.
		Inches.	Inches.	Sq. inches.	Pounds.	Pounds.	Pounds.
0	4.07	3.99	3.72	14.84	49,000	71,700	4,832
0	4.00	4.07	3.70	15.06	91,900	91,900	6,102
1	4.08	3.99	3.89	15.52	66,100	66,100	4,259
1	4.04	3.99	3.94	15.72	75,000	79,400	5,051
2	3. S9	4.02	4.00	16.08	84,000	101,200	6,294
2	4.07	3.99	4.00	15.96	84,000	104,500	6,548
. 3	3.98	4.01	4.00	16.04	109,800	109.800	6,845
3	3.98	4.06	4.02	16.32	91,000	106,400	6,520
4	3.98	4.05	4.03	16.32	85,000	86,200	5,282
4	3.98	4.06	4.10	16.65	88,000	94,200	5,658
6	4.01	3.98	4.00	15.92	37,500	37,500	2,356
6	3.98	4.06	4.03	16.36	50,400	50,400	3,081
8	4.02	3. 97	4.02	15.96	44,600	44,600	2,794
8	3.96	4.05	4.02	16.28	41,200	41,200	2,531
10	3.95	4.02	4.12	16.56	39,800	40,400	2,440
10	3.97	4.01	4.20	16.84	39,300	39,300	2,334
12	4.05	3.97	3.94	15.64	36,900	36,900	2,359
12	3.97	4.03	3.96	15.96	30,100	31,300	1,961
14	4.01	3.97	4.06	16.12	22,000	33,000	2,047
14	4.07	3.96	4.04	16.00	38,100	38,100	2,381
16	3.95	4.02	4.07	16.36	35,300	35,300	2,158
16	4.08	3.98	4.06	16.16	34,800	34,800	2,153
18	4.04	3.98	4.07	16.20	34,200	34,200	2, 111
18	4.06	4.00	4.05	16.20	36,800	36,800	2,272
20	4.05	3.96	4.04	16.00	29,300	29,300	1,831
20	4.04	3.96	4.02	15.92	31,400	31,400	1,972
22	4.03	3.98	4.06	16.16	33,700	33,700	2,085
22	4.03	3.96	4.03	15.96	27,400	27,400	1,717
24	4.03	3.97	4.04	16.04	25,600	24,600	1,596
24	4.05	3.96	4.07	16.12	27,300	28,100	1,743
26	4.07	3.98	4.07	16.20	23,700	23.700	1,463
26	4.09	3.96	4.03	15.96	25,900	25,900	1,623
28	4.09	3.97	4.02	15.96	24,400	24,400	1,529
28	4.07	3.96	4.05	16.04	27,400	27,400	1,708
30	4.01	3.97	4.03	16.00	21,800	21,800	1,363
30	4.05	3.97	4.07	16.16	24,600	24,600	1,522
32	3.98	4.03	4.01	16.16	19,000	19,500	1,207
32	3.98	4.06	4.05	16.44	24,100	24,100	1,466
34	3.95	4.05	4.01	16.24	20,100	20,100	1,238
34	3.99	3.99	4.06	16.20	23,600	23,600	1,457
36	4.03	4.01	3.98	15.96	17,200	18,300	1,147
36	4.08	4.01	4.01	16.08	22,700	22,700	1,412
38	4.10	4.02	4.02	16.16	22,500	22,500	1,392
38	4.00	4.07	4.02	16.36	20,800	20,800	1,271
40	4.00	4.04	4.00	16.16	20,000	20,000	1,238
40 '	3.98	4.01	4.02	16.12	19,400	19,400	1,203
42	4.02	3.96	3.99	15.80	15,300	15,300	968
42	4.00	4.00	3.99	15.96	20,700	20,700	1,297
44	3.99	4.10	3.97	16.28	20,600	20,600	1,265
44	4.06	4.01	3.95	15.84	16,900	16,900	1,067
46	4.02	3.99	4.02	16.04	19,300	19,300	1,203
46	4.03	4.00	4.00	16.00	15,400	16,300	1,019
48	3.95	4.01	4.00	16.04	19,100	19,100	1,191
48	3.97	4.00	4.00	16.00	19,200	19,200	1,200
50	3.96	4.00	4.00	16.00	19,800	19,800	1,238
50	4.02	3.96	3.98	15.76	17,300	17,300	1,098
52	3.95	4.02	4.00	16.08	17,400	17,400	1,082
52	4.06	3.95	4.01	15.84	18,600	18,600	1,174
54	3.95	4.00	4.00	16.00	18,400	18,400	1,150
54	4.03	3.94	4.01	15.80	15,100	15,100	956