MATERIALS FOR CONCRETE CONSTRUCTION IN MANILA. 469 



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MILLIMETERS ■ ^ 



MESHES TO INCH 5«'o.'"-4fn "j 



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



Fig, 8. — Geanulaemetric Analysis of Oeani Sand. 



Another analysis of Orani sand is given in iig. 8 which shows 4.1 per 

 cent of fine gravel; 23.4 jjer cent held on a 20-mesh sieve, 67.6 per cent 

 held on a 30-niesh sieve, and 0.5 per cent passing a lOO-mesh sieve. It 

 will be noted that from the 60-niesh sieve to the 20-mesh the line indi- 

 cating the analysis is nearly straight. 



PERCENTAGE BY WEIGHT 

 PASSING DIFFERENT SIEVES 





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MILLIMETERS 

 MESHES TO INCH OBo.o'"-''-! ■^. 



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



Fig. 9. — Gkanxtlaemetkic Analysis of Taklac Sand. 



The analysis of a sample of Tarlac sand is introduced for the sake of 

 comparison, although the sand is not available for use in Manila. The 

 percentage of fine gravel is shown to be 1.5 ; 36 per cent is held on a 

 20-mesh sieve, 59 per cent is held on a 30-mesh and 1.5 per cent passes 

 a lOO-mesh. This sample had been sieved to take out coarse pebbles. 



