CEMENT.
480
In the table which next follows the material on which the determina _ tions were made was taken from a series of tests on the influence׳of exposure to different temperatures while setting. The cubes which set at the temperatures tabulated at 36° F. and 0° F. were kept in a cold-storage warehouse during the period of three months, the time intervening between the mixing with water and when the samples were tested. The specific gravity determinations followed soon after the tests for strength were completed.
SPECIFIC GRAVITY DETERMINATIONS ON REGROUND MATERIAL FROM 2״ CUBES SET IN AIR, WHICH WERE EXPOSED TO DIFFERENT TEMPERATURES WHILE SETTING.
[Dried at 110° C. before making the determinations.]
Brand.	Temperatures while setting.		
	70° F.	36° F.	0° F.
	2.76	2.67	2.82
	2.88	2.79	2.94
	2.75	2.53	2.82
	2.70	2.60	2.89
	2.48		2.54
	2.95	2.88	3.02
	2.65	2.65	2.75
	2.87	2.79	2.85
	2.87	2.74	2.83
	2.89	2.79	3.02
			
The above material after heating to redness gave the results which appear in the following table:
Brand.	Specific gravity after heating to redness. Material from cubes set in air at temperatures of—			Loss in weight on heating to redness from 110° C. Material set in air at temperatures of—		
	70° F.	36° F.	0° F.	70° F.	36° F.	0° F.
	3.21	3.22	3.18	8.68	9.92	7.12
	3.14	3.15	3.17	8.50	10.48	7.08
	3.21	3.19	3.18	9.96	11.48	7.08
	3.20	3.16	3.18	8.96	10.56	5.38
	2.98		2.92	10.03		7.92
	3.25	3.23	3.26	7.84	10.12	4.92
	3.07	3.04	3.08	16.10	15.96	13.60
	3.26	3.17	3.22	11.04	11.40	9.12
	3.17	3.14	3.17	10.00	12.36	9.08
	3.18	3.22	3.22	8.08	8.96	5.92
						
Means, omitting the Steel	3.19	3.17	3.18	9.91	11.25	7.70