CONCRETE DESIGN 



287 



ULTIMATE UNIT CRUSHING STRENGTH OF VARIOUS 

 STONES AND STONE MASONRY PIERS 



crushing strength of 1-2-4 concrete 6 mo. old is 2,500 Ib. 

 per sq. in. Using a factor of safety of 6, the safe intensity 



2,500 

 of stress is Then the safe total load the column can 



2500 

 carry is 113.1 X = 47,125 Ib. 



