100 



The Philippine Jommal of Science 



1914 



Table XX. — Calculation of volcanic tuff raw mixture containing 10 per 

 cent less San Guillermo, Binangonan, limestone than required by the 

 formula. 





Total. 



Individual constituents. 



Silica 

 (Si02). 



Ai.,.„ir,ol Iro" 1 Calcium -n^^^^^^- Volatile 



(AI2O3). 1 (pg^Og) , (CaO). ! (MgO). g^^) 



1 1 i 



The numbers give parts of the materials by weight. 



Limestone 



Tuff 



Unbumed 



Volatile 



314. 10 7. 32 1. 38 

 100.00 ' 56.36 1 19.53 



1 

 1.22 167.70 



6.97 1 4.30 



2.32 

 1.70 



134.00 

 9.30 



414. 10 

 143.30 



63.68 



20.91 



8.19 



172. 00 



4.02 



143.30 











1 





270. 80 



6.^.68 



20.91 



8.19 



172.00 



4.02 











Calculated composition in per cent. 



Mixture 



99.62 

 99.26 



15.38 

 23.52 



5.05 

 7.72 



1.98 

 3.02 



41.54 0.97 34.60 1 



f;iinker 



63. 52 1. 48 













The silica to alumina (plus iron oxide) ratio in the mixture is 2.19. 

 The lime to silica, alumina, and iron oxide ratio in the mixture is 185. 

 The cementation index of the mixture is 1.16. 



The ground clinker from the burned mixture gave the following 

 results : 



Table XXI. — Physical examination of cement from volcanic tuff raw m,ix- 

 ture containing 10 per cent less San Guillermo, Binangonan, limestone 

 than required by the formula. 



Tensile strength in pounds per 

 square inch. 



Neat. Mortar 1:3. 



7 days. 



28 days. 7 days. 



28 days. 



715 



715 275 



1 



374 



These raw materials in so far as composition is concerned 

 appear to be well adapted to the manufacture of Portland cement, 

 for both mixtures produced cement above that required by the 

 standard specifications. 



For purposes of comparison with the above cement mixtures, 

 we give the standard slurry mixture of the Sandusky Portland 

 Cement Company, Ohio,^^* as follows : 



"Hillebrand, W. F., Joum. Am. Chem. Soc. (1903), 25, 1186. 



