TESTING OF PORTLAND CEMENT. 



331 



larger quantity is actually required in practice. So long 

 as there is sufficient water present to satisfy the chemical 

 requirements, the smaller the quantity of water the higher 

 the tensile breaking load will probably be. The actual 



FIG. 167. BAILEY'S WATER LOAD MACHINE FOR CEMENT TESTING. 



percentage of water used for neat cement varies from 

 16 to 25 per cent. 



When the cement has been gauged that is, the water 

 thoroughly worked into it it must be put into the moulds 

 and well forced in with a wooden rammer, the cement 

 being smoothed off level with the top of the mould. The 



