18, 2 King: Philippine Conerete and its Aggregates 107 
of aggregates had to be postponed because the material sent 
was insufficient, thus entailing a delay of several weeks; some- 
times the samples never came, and construction proceeded with- 
out a preliminary test of the aggregates. Such conditions are 
regrettable. The purpose of conducting tests on concrete ag- 
gregates is to eliminate, at the minimum of expense, unsuitable 
materials. Unfortunately it has not always been possible to 
carry out the recommendations of this laboratory; and there are 
instances on record where fine aggregates, entirely unfitted for 
concrete construction, have been used, often with disastrous 
results. 
TABLE 1.—Number of concrete specimens, classified according to provinces 
submitting aggregates or test pieces. 
Province. Specimens tested. 
Leyte’ 256 
Manila and vicinity 242 
Bulacan 229 
lloilo 156 
Cebu ee 88 
Samar 78 
Cavite 73 
Occidental Negros 68 
Laguna 52 
Albay 49 
Capiz 47 
Pangasinan 82 ‘+ 
Bohol 27 
Tarlac 26 
Cotabato 22 
Marinduque 20 
Ilocos Norte 18 
Ilocos Sur 18 
Antique 18 
Rizal 16 
Sorsogon 16 
Isabela 16 
Oriental Negros 14 
Batangas 13 
Tayabas 18 
_ Surigao 12 
Zambales 12 
Bataan 11 
Misamis 10 
Nueva Ecija 8 
Zamboanga 8 
Pampanga | 4 
Palawan 
Jolo 
Total 1,677 
