406 



cox. 



coral, rhyolite tuff and clay of the following compositions. For piirj^oscs 

 of comparison I also give some analyses of Philipj)ine materials. 



Component. 



Panama cement 

 materials. 



Materials near 

 Manila. 



Analyses of Philippine limestones. 



Coral. 



Rhyo- 

 lite 

 tuff. 



Clay. 



Tufl« 

 from 

 Gua- 

 dalupe. 



Pasig 

 clay.!" 



From 

 Danao, 

 Cebu 

 coal 

 fields. 



From 

 near 

 Pilar, 

 Capiz. 



From 

 the in- 

 terior, 

 Capiz 

 near 

 Duma- 

 lag. 



From 

 Rom- 

 blon. 



Average 

 from mili- 

 tary res- 

 ervation 

 drill holes 

 Nos. 5 and 

 6, Batan 

 Island. 



SiO. 



AI2O3 



0.89 

 0.32 

 0.36 

 52.62 

 0.38 



43. !iO 



60.93 

 15.86 

 5.46 

 4.02 

 1.79 



10.44 



49.91 

 15.48 

 10.06 

 6.98 

 2.27 



12.92 



57.68 

 16.60 

 4.92 

 3.28 

 1.48 



10.44 



50.51 

 20.20 

 8.08 

 3.88 

 2.48 



12.92 



0.36 



I 0.18 



55.62 



43.67 



0.72 

 (0.51 

 10.31 

 54.03 



0.99 



43.93 



0.21 

 0.17 

 0.71 

 54.42 

 0.41 



43.84 



0.10 



I 0.17 



.5.5.23 

 0.45 



43.80 



0.97 

 (0.56 

 10.36 

 53.86 



0.19 



43.47 



Fe,03 



CaO 



MgO 



Loss on igni- 

 tion _ 









* Recalculated to the same loss on ignition as the Panama tuff. 

 ^ Recalculated to the same loss on ignition as the Panama clay. 



It will be seen that the Panama coral is a fairly pure calcium carbonate 

 low in magnesia, ideal for the manufacture of cement. The analyses of 

 several samples of Philippine limestones show them to he even purer 

 than the Panama sample. Limestone occurs abundantly throughout 

 the whole Archipelago and is unifonnily remarkably pure. 



Prom analyses giving the composition of the cement clinker, the 

 Panama materials were mixed in the following proportions and gave 

 the following data and results for the final jjroduct : 



Ingredients. 



s 







13 



a 



S-i 



Fineness of 



grinding in 



per cent. 



Tensile strength of briquettes in kilos per 

 square centimeter.'* 



> 





 6 



> 



a; 



1 



d 



> 



d 

 8 



Neat. 



Sand (3:1). 







1 



■a 

 00 



.a 





 S 



CO 



1 



a 

 



a 



CO 



01 



•a 





1 



CO 



1 



a 



Coral-clay 



Coral-tuff 



Coral-clay tuff . 



2.88 



3.30 



1 



1 



100 

 100 

 100 



98 

 99 

 95 



90.3 

 93.3 

 88.6 



16.7 

 14.8 

 20.3 



44.5 

 39.4 

 43.1 



50.6 

 44.7 

 51.6 



51.7 

 43.8 

 47.6 



57.8 

 47.7 



14.4 

 15.9 

 12 2 



21.2 

 21.9 

 21.2 



25.7 



27.6 

 22 4 



27.7 

 30.0 

















"One kilogram per square centimeter =14.22 pounds per square inch. 



It is interesting in the above table to note that the coral-tuff cement 

 gives the strongest sand mortar. 



The laboratory is now preparing to install a small rotary cement kiln 

 and when this is completed further experiments will be carried on in 

 this direction. 



