CEMENT--GROUTS
526
Star Portland Cement, with Plaster.
[40 per cent water. Remained in the mixing bed 6£ hours.]
Dimensions.			Sectional area.	First crack.	Compressive strength.		Remarks.
Height.	Compressed surface.				Total.	; Per square inch.	
Inches.	Inches.	Inches.	Sq. inches.	Pounds.	Pounds.	! Pounds.	
4.05	3.94•	4.14	16.31	63,600	66,500	4,077	
4.05	3.94	4.13	16.27	52,000	67,400	4,143	
4.00	3.96	4.20	16.63	71,700	71,700	4,311	
4.04	3.97	4.24	16.83	74,700	74,700	4,439	
[60 per cent water. Remained in the mixing bed 11 hours.]
3.97	4.20	3.93	16.51		33,500	2,029	
4.03	4.15	3.92	16.27		31,300	1,924	
4.01	4.08	3.94	16.08		33,100	2,058	
4.00	4.14	3.94	16.31		32,400	1,987	
4.03	4.15	3.94	16.35		27,700	1,694	
[80 per cent water. Remained in the mixing bed 34 hours.]
4.08	4.00	4.07	16.28		25,100	1,542	
4.00	4.06	3.99	16.20	14,000	21,200	1,309	
4.03	4. 00	4.10	16.40		25,700	1,567	
4.03	4.00	4.03	16.12		26,100	1,619	
4.03	4.00	4.05	16.20		25,900	1,599	
[100 per cent water. Remained in the mixing bed 45 hours.]
3.99	4.01	4.11	16.48	22,700	24,100	1	462	
4.00	4.01	4.07	16.32		20,200	1	238	
3.97	4.05	4.00	16.20		20,100	1	241	
3.98	4.02	4.00	16.08	21,500	22,300	1	387	
4.00	4.00	4.05	16.20		22,800	1	407