COMPRESSIVE STRENGTH OF CONCRETE— Series I. 

 Fig. 1. 



30 40 50 60 70 80 days 



Abscissae = Age in days. Ordinates = Crushing force in 100 lbs. per square 



inch. (Mean of two tests.) 

 Bluestone with bluestone dust 



Nepean River sand 

 Sydney white sand 



Fig. 2. 





























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10 



20 



70 



80 days 



Abscissae = Age in days. Ordinates = Crushing force in 100 lbs. per square 

 inch. (Mean of two tests.) 



Nepean River gravel with bluestone dust 



„ „ Nepean River sand 



,, „ Sydney white sand 



