TABLE 68. 



MECHANICAL PROPERTIES. 

 TABLE 68. Cement and Concrete. 



NOTE. (From Bureau of Standards Tech. Paper 58.) Neat cement briquettes mixed at 

 plastic consistency (water 21 per cent) show 0.52 kg/mm 2 or 740 lb/in 2 tensile strength at 28 

 days' age; 



i Cement: 3 Ottawa sand-mortar briquettes, mixed at plastic consistency (water 9 per 

 cent) show 0.28 kg/mm 2 or 400 lb/in 2 tensile strength at 28 days' age. 



SMITHSONIAN TABLES. 



