527
CEMENT----GROUTS,
Star Portland Cement, without Plaster.
[40 per cent water. Remained in the mixing bed 4$ hours. ]
Dimensions.			Sectional area.	First crack.	Compressive strength.		Remarks.
Height.	Compressed surface.				Total.	Per square inch.	
Inches.	Inches.	Inches.	Sq. inches.	Pounds.	Pounds.	Pounds.	
4.01	3.97	4.20	16.67	51,100	54,900	3,293	
4.02	3.95	4.16	16.43	36,000	41,500	2,526	
4.02	3.94	4.13	16.27	45,900	52,200	3,208	
4.03	4.18	3.97	16.59	53,500	53,500	3,225	
[50 per cent water. Remained in the mixing bed 1\ hours.
4.03	3.93	4.13	16.23	41,000	43,500	2,680	
4.04	3.94	4.14	16.31	41,100	41,100	2,520	
4.06	3.95	4.16	16.43	49,500	49,500	3,013	
4.00	3.95	4.18	16.51	49,100	49,100	2,974	
4.00	3.95	4.17	16.47	47,000	50,400	3,060	
[60 per cent water. Remained in the mixing bed 15 hours.]
4.01	4.13	3.93	16.23	41,600	41,600	2,563	
4.08	4.17	3.95 •	16.47	39,100	39,100	2,374	
4.02	4.11	3.95	16.23	39.800	39,800	2,452	
4.06	4.12	3.94	16.23	31,500	35,900	2,212	
4.00	3.95	4.15	16.39	36,500	38,700	2,361	
[70 per cent water. Remained in the mixing bed 80$ hours.]
4.00	4.06	3. 95	16.04		27,100	1,690	
4.05	4.15	3.95	16.39		28,900	1,763	
3.96	4.10	4.00	16.40		30,800	1,878	
4.03	4.12	3.94	16.23	26,800	29,100	1,793	
4.00	4.03	3.95	15.92		27,800	1,746	
[80 per cent water. Remained in the mixing bed 44 hours.]
3.97	4.10	4.01	16.44		26,700	1,624	Age 33 days.
3.95	4.11	4. 02	16.52		27,400	1,659	Do.
3.95	4.07	4.06	16.52		26,900	1,628	Do.
4.05	4.22	3.95	16.63		28,400	1,708	Do.
3.95	4.13	4.03	16.64		23,400	1,707	Do.
The tests of grouts which were mixed with hot and cold water gave the results which follow. The temperature of the hot water used was 82° C. The cold water was at about freezing.