MATERIALS FOR CONCRETE COJSISTllUCTION IN MANILA. 467 



The analysis of a good grade of Pasig sand is shown in fig. 3. This 

 sand contains 2.3 per cent of fine gravel ; 36 per cent is held on a 20-mesh 

 sieve; 58 per cent is held on a 30-mesh and 2.6 per cent passes the 

 100-mesh. 



PERCENTAGE BY WEIGHT 

 PASSING DIFFERENT SIEVES 

















































___-- — "^-^ 















X^ 



/" 















^ 



^ 













/ 



^ 













/ 





y 











1 



// 



'' 











■ ^ 



/ 











^ 



y 



/ 













MrLLIMCTERS 

 MESHES TO INCH OODlO"!*"! o. 



SIZE OF OPENINGS IN MILLIMETERS AND NUMBER OF MESHES TO THE INCH 



Fig. 4. — GRANnLAEMETKic Analysis of Pasig Sand Obtained by Deedging. 



The analysis in fig. 4 shows a sand containing 12 per cent of fine 

 gravel. This sand runs a little coarser than the one shown in fig. 3. 

 Twenty-nine per cent was held on a 20-mesh sieve, 51 j)er cent was 

 held on a 30-mesh sieve and but 2 per cent passed the 100-mesh. 



PERCENTAGE BY WEIGHT 

 PASSING DIFFERENT SIEVES 

















^ 

















/ 

















y 

















__„*^;^--''''^ 





























/ 



"^ ^^ 















/ 



^ 













/ 



- 











/ 



'/ 



-/ 









^ 







/ 











UILUUETERS ^- ^ ^- ^- '*■ '^- ^ ~i 

 MESHES TO INCH gajio'o-*^ r- 



SIZE OF OPENINGS IN MILLIMETERS AND NUMBER OF MESHES TO THE INCH 



Fig. 5. — Granularmetric Analysis of Quingua River Sant>. 



The sample of sand taken from the Quingua Eiver shows 25 per cent 

 of fine gravel mixed with it; 41.5 per cent was held on a 20-mesh sieve, 

 55 per cent was held on a 30-mesh sieve, and but 1 per cent passed a 

 100-mesh. This sand is clean and the most evenly graded of any of the 

 samples examined. 



90339 9 



