292 
CEMENT MATERIALS AND INDUSTRY 
Analyses of Lehigh district cements. 
[bull. 24; 
Silica (Si0 2 ) 
Alumina (A1 2 3 ) 
Iron oxide (Fe 2 - 
O,) ----- 
Lime ( CaO ) 
Magnesia (MgO) 
Alkalies (K 2 0, 
Na 2 0) 
Sulphur trioxide 
(SO,) 
21. 30 
7.65 
2.85 
60. 95 
2, 95 
1.15 
1.81 
:{ 
21.96 ! 21.1 
8. 29 8. 
2. 67 2. 5 
60. 52 65. 6 
3.43 2.4 
(«) { a) 
1.49 («) 
4 
5 
20.87 
19. 06 
7.60 
7.47 
2.66 
2.29 
63. 04 
61. 23 
2.80 
2.83 
(a) 
1.41 
1.50 
1.34 
(i 
7 
8 
21.65 
22. 68 
21.08 
8. 09 
6.71 
7.86 
2. 93 
2.35 
2.48 
63. 10 
62. 30 
63. 68 
2.00 
3. 41 
2.62 
(a) 
(a) 
(«) 
1.02 
1.88 
1.25 
9 
10 
24. 23 
4.80 
1.86 
63.01 
3.20 
(o) 
1.20 
24.^ 
4., 
2. 
64. 
2.1 
(a; 
1. 
a Not determined. 
The characteristics of the Lehigh district Portland cements are bet 
brought out by the following summary of the range and average c 
the various constituents. In making up the average the silica, aluminji 
and iron oxide contents of analyses Nos. 9 and 10 have not been used 
and the lime percentage of No. 3 has also been excluded. For conn 
parison, 9 and 10 have been averaged for the first three constituent! 
and the results are placed in the fourth column. 
Range and average of Lehigh district Portland cement. 
Silica (Si0 2 ) 
Alumina (A1 2 3 ) 
Iron oxide (Fe 2 3 ) - - . 
Lime (CaO) 
Magnesia (MgO) 
Alkalies (Na 2 0, K 2 0). 
Sulphur trioxide (S0 3 
Maximum. 
22.68 
8.29 
2.93 
64. 33 
3.43 
1.41 
1.88 
Average. 
21.21 
7.71 
2.59 
62. 46 
2.82 
1.28 
1.43 
Minimum. 
19. 06 
6.71 
2.29 
60. 52 
2.00 
1.15 
1.02 
Average < 
9 and 10. ' 
24.3 
4.5 
2.2 
