536 



800 



CEMENTS, LIMES, AND PLASTERS. 



Neat, 52 weeks 



I 400 



| 300 



JOO 



Neat, 25 weeks 



Neat, 12Tveeks 



Neat, 4 w.eeks 



Neat, 1 week 

 1:3, 52 weeks 



1:3. 25 weeks 



1:3, 12 weeks 



1:3, 4 weeks 



1 2 



Per. cent of. plaster'' 



FIG. 133. Effect of plaster on strength; different ages and compositions. 

 (Dyckerhoff.) 



