gg The Philippiyie Journal of Science lau 



The analyses show that materials which are more or less suited 

 to the manufacture of Portland cement are widely distributed. 

 Pratt'" gives the following list of localities, each of which present 

 in some degree the characteristics essential to a cement manu- 

 facturing site. 



1. Island of Cebu. 



2. Vicinity of Manila. 



3. Island of Batan, Albay Province. 



4. Island of Masbate, Sorsogon Province. 



5. Island of Polillo, Tayabas Province. 



6. Vicinity of Bani, Pangasinan Province; 



7. Island of Romblon, Capiz Province. 



8. Vicinity of Balayan, Batangas Province. 



9. Vicinity of Iloilo, Iloilo Province. 

 10. Vicinity of Loay, Bohol Province. 



A complete investigation of the Cebu materials is now being 

 made by Messrs. Reibling and Reyes. We have burned a few 

 mixtures of pure limestone combined with clays obtained from 

 the Mount Licos region, Cebu, but since Manila is the metropolis 

 and principal distributing point in the Islands we have confined 

 our attention principally to the investigation of volcanic tuff and 

 Binangonan limestone which are the cement raw materials 

 available in the vicinity. 



EXPERIMENTAL 



In our experiments the materials were thoroughly mixed. 

 Each mixture was moistened with water, made up into a dough- 

 like mass, rolled out with a rolling pin to a thickness of 10 

 millimeters, and cut into bricks, the dimensions of which were 

 about 25 by 10 by 10 millimeters. The molded bricks were then 

 dried in an air bath at 100°, after which they were placed in 

 bottles preparatory to burning. The raw materials and finished 

 products in all cases except where otherwise specified were 

 ground to pass a sieve having 120 meshes to the inch. 



Experimental burnings have been made in both rotary and 

 stationary kilns, but considerable difficulty was experienced in 

 obtaining an experimental kiln which would give a sufficiently 

 large quantity of noncontaminated, well-burned clinker. A kiln 

 must be so constructed that the escape of the heat generated 

 from the fuel will be hindered as much as possible if a high 

 temperature is required. 



Campbell," in his experimental cement work, used a small 



" Loc. cit., 91. 



"^Journ. Am. Chem. Soc. (1902), 24, 248. 



