The Philippine 
Journal of Science 
VOL. 18 FEBRUARY, 1921 No. 2 
PHYSICAL PROPERTIES OF PHILIPPINE CONCRETE 
AND CONCRETE AGGREGATES 1 
By Albert E. W. King 
Of the Bureau of Science, Manila 
Among other activities, during the past ten years, the mate- 
rials testing laboratory of the Bureau of Science has been con- 
ducting tests on concrete made for the Government in different 
parts of the Archipelago. Not only has this laboratory tested 
specimens of concrete that have been cast on the building site 
under typical field conditions, but it has sometimes made pre- 
liminary laboratory tests of the same aggregates so that a 
comparison of the strength of concrete made in the field with 
that of concrete mixed under carefully controlled laboratory 
conditions is possible. However, it should be mentioned that 
the Government has lately erected numerous concrete structures 
throughout the Islands without making a previous laboratory 
examination of the aggregates, and even without casting test 
specimens during the process of construction, so that the results 
recorded in this paper, unfortunately, are fragmentary. Then 
again, some of the data obtained by this laboratory were so 
lacunose that their inclusion here is not warranted. For in- 
stance, the Bureau of Science materials testing laboratory has 
occasionally received concrete test pieces without marks of 
identification as to age, quality of the mixture, aggregates and 
cement used, or the structure represented. As it is, I have 
included tests of concrete made of aggregates whose precise 
origin is unknown. Sufficient data, however, are given in these 
instances to sanction publication. Nearly all of the test spec- 
imens made in the field were sent to the Bureau of Science by 
1 Received for publication June 19, 1920. 
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