THE PHILIPPINE 



Journal of Science 



A. Chemical and Geological Sciences 

 and the Industries 



Vol. V DECEMBER, 1910 No. 6 



PHYSICAL AND CHEMICAL PROPERTIES OF 

 PORTLAND CEMENT.— PARTS I AND II. 



By W. C. Reibling and F. D. Reyes. 

 (From the Chemical Laboratory, Bureau of Science, Manila, P. I.) 



INTRODUCTION. 



In a paper on the subject of Portland Cement which appeared in a 

 previous number of this Journal 1 the efficiency of modem cement spec- 

 ifications and standard methods of testing were discussed, and the effect 

 of climatic and atmospheric influences on certain brands of commercial 

 Portland cement noted. Incidentally, exception was taken to the pub- 

 lished statements of several authorities regarding the significance and 

 value of the specific gravity and soundness tests. It was also pointed 

 out that "seasoning" could injure as well as benefit cements and almost 

 incredible changes in the physical properties of some cements produced 

 by slight changes in temperature, or by aeration, were recorded. In con- 

 clusion, the authors suggested the characteristics which cements should 

 possess in order to give the best efficiency in tropical countries, and stated 

 that investigations would be continued on samples of many grades of 

 Portland cement in order more thoroughly to test the soundness of their 

 deductions. 



Our main efforts in continuing this work have been directed toward a 

 study of those characteristics of Portland cement regarding which there 



1 Reibling, W. C, and Salinger, L. A., This Journal, Sec. A (1908), 3, 137-185. 

 99667 367 



