is ,2 King: Philippine Concrete 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 
Iloilo 
156 
Cebu 
88 
Samar 
78 
Cavite 
73 
Occidental Negros 
68 
Laguna 
52 
Albay 
49 
Capiz 
47 
Pangasinan 
32 
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 
13 
Surigao 
12 
Zambales 
12 
Bataan 
11 
Misamis 
10 
Nueva Ecija 
8 
Zamboanga 
8 
Pampanga 
4 
Palawan 
3 
Jolo 
2 
Total 1,677 
